Measure. Control. Regulate.

Comfortably controlled and energy-saving.

MEASURE CONTROL REGULATE

Controlling ventilation and Changes in room occu- Complete system solutions The extensive MSR range air conditioning systems pancy, deteriorations in bring the maximum possible from Helios provides the in accordance with the quality of air at different security for the user and full ideal solution for any appli- changing requirements times, fluctuating tempera- guarantee by Helios. cation and simultaneously and conditions is a must tures, day and night set- Furthermore, a lot of time meets all requirements in for comfortable, energy tings, etc. call for corre- can be saved during plan- relation to energy saving efficient ventilation. sponding adjustments. ning, installation and opera- and noise reduction. Helios offers regulation, tion if the control and regu- control and devices lation devices are perfectly for all functions, which are adapted to the fans and tailored to the fans. their functions. Problems are solved before they emerge.

525 Measure Control · Regulate Control. Regulate. Optimise.

Task Helios controller solution Page Manual control of air I Manual speed controller flow volume – Without motor protection – 10 V, 24 V DC – Potentiometer for EC fans PU / PA, SU / SA 541 – 230 V~ – Electronic, flush / surface mounted ES, BSX 531 – 230 V~ – Transformer, surface mounted TSW, TSSW 532 – 400 V 3~ – Transformer, surface mounted TSD, TSSD 533 – 230 V~ – Transformer, electronic, surface mounted ETW 535 – With built-in motor full protection for connection to thermal contacts – 230 V~ / 400 V 3~ – Transformer, surface mounted MWS / RDS 532 f. – 400 V 3~ – Electronic, surface mounted ESD 535 – 400 V 3~ – Frequency inverter FU 536 f.

I Operation switch for fans with 2 speeds – Pole switch for Dahlander windings, flush / surface mounted PDA / PDU 529 – Pole switch for separated windings, flush / surface mounted PGWA / PGWU 529

Overrun timer I Overrun switch Thermal electric, electronic, mechanic ZT, ZNE, ZNI, with adjustable and fixed times ZV 527

Air quality – I Air quality sensor with on / off function depending automatic system on room air quality ACL 543

Air flow velocity I Air flow monitor for monitoring the minimum air flow velocity in ducts and pipes SWE, SWT 543

°C Room temperature I Ventilation thermostat – one step with on / off function TME 1 542 dependant – four step, mechanical TME 4 534 – stepless, electronic EST 534

I Temperature controllers with integrated power unit, surface mounted – 230 V~ – electronic EUR 6 C 538 – 230 V~ / 400 V 3~ – transformer KTRW / KTRD 534

°C Temperature I Differential temperature controller electronic,, stepless, with power unit difference dependant – 230 V~ for surface mounting EDTW 543

Humidity dependant I with on / off function, surface mounted HY 3 542 control I Fans for sanitary areas with integrated humidity control M1/.. F, ELS-VF 22, 53

P Temperature, I Universal controller with power unit 230 V~ EUR 6 C 538 Dor °C pressure, speed with 0-10 V DC output, for EC fans EUR EC 539 or m/s Pa Pressure dependant with power unit 400 V~ FU 536 f. control I Differential pressure controllers, surface mounted, with digital display – 0-10 V DC – electronic EDR 540

I Differential pressure switch for monitoring the air filters, system pressure and fan operation DDS 542

Motor protection I Motor full protection switch to connect the thermal contacts for MD, MW against overload monitoring the windings temperature M 2, M 3, M 4 530

I Motor protection tripping unit for PTC – temperature sensor in windings MSA 530

I Operation switch I Reverse switch to change air flow direction 0 of axial fans WS 528

I Isolation switch to disconnect all phases for service works RS, RHS 528 f.

I Pole / reverse switch as before, but for 2 speed axial fans PWGW, PWDA 529

Timer I Weekly autotimer for automatic operation control WSUP, WSUP-S 527

526 Overrun timer

Type ZT Ref. no. 1277 Variable run on time, depending on Thermal electric overrun timer duty cycle. with adjustable run on time, Min. approx. 2 min.; max. approx. 12 min. depending on duty cycle. Optional delayed start (approx. 45 sec.) Optional delayed start via different Voltage 230 V, 1~, 50/60 Hz wiring options. Current 4 A (ind.) In parallel wiring with Protection class IP 20 the fan can be temporarily Dimensions mm W 32 x H 40 x D 14 switched off via a series switch. Installation flush mount box behind switch Wiring diagram no. SS-174 – when two rooms/ are to be controlled SS-174.3

I Flush mounted overrun timer Type ZNE Ref. no. 0342 Stepless adjustable for installation in gang boxes Electronic overrun timer with run on time 0 – 21 min. behind a switch stepless adjustable run on times Optional delayed start 45 sec. Specially designed overrun timer Operation via on / off switch, Voltage 230 V, 1~, 50/60 Hz for bathroom and toilet. The com- e.g. in combination with light Current min. 0.05 A max. 0.8 A (ind.) pact design allows installation be- switch. Protection class IP 40 hind a switch within a single gang Compact design allows easy Dimensions mm W 17 x H 37 x D 13 box. Operation via on / off switch installation. Installation flush mount box behind switch or ideally to be combined with a Wiring diagram no. SS-477.1 light switch in rooms without a – when two rooms/switches window. Can be individually adjust- are to be controlled SS-174.3 ed through different timer varia- tions. Type ZNI Ref. no. 0343 Adjustable interval time 0, 4, 8, 12, 24 hr. Interference immunity and emission Electronic interval switch with Run on time if manually switched, ZT is designed with a thermal electric circuit, is immune against tolerable peak voltages and adjustable interval and run on stepless adjustable 0 – 21 min. interference-free. The interference immunity times Optional delayed start 45 sec. and emission of ZNE/ZNI comply with the latest EN guidelines. ZV is tested as follows: Starts operation automatically at Voltage 230 V, 1~, 50/60 Hz Interference emission to DIN EN 55014 / VDE adjustable time intervals, if no Current min. 0.05 A max. 0.8 A (ind.) 0875-14-1; DIN EN 50370 / VDE 0875-1; manual switching has taken place. Protection class IP 40 DIN EN 61000-3-3 / VDE 0838-3. If switched manually, e.g. light Dimensions mm W 17 x H 37 x D 13 switch, the preset overrun time Installation flush mount box behind switch applies. Wiring diagram no. SS-477.1 – when two rooms/switches are to be controlled SS-174.3

I Overrun timer for mounting Type ZV Ref. no. 1279 Stepless adjustable run on time in terminal box Electronic overrun timer with 4 – 15 min. stepless adjustable run on times Voltage 230 V, 1~, 50/60 Hz and operation switch with run on Current 2,1 A (ind.) time/continuous operation options. Protection class IP 20 Parallel wiring to a light switch and Dimensions mm W 18 x H 93 x D 67 fan is possible via an on / off Installation terminal box, switch or push button. 35 mm sectional rail Wiring diagram no. SS-236.1

I Weekly autotimer Type WSUP Ref. no. 9990 Voltage 230 V, 1~, 50 Hz Surface mounted or in flush Weekly autotimer Current 1 mA / 20 mV DC mounted box Digital autotimer with LCD display Switching contact potential-free changeover to automatically control any unit in 250 V, 1~, 8 A cos j » 1, µ-contact accordance with the technical da- Protection class IP 20 / II ta. Suitable for switching the least Dimensions mm W 85 x H 85 x D 52 electronic current from 1 mA / Installation surf. casing, flush box 20 mV through a standard, gilded Temperature range -10° C to +35° C µ-contact. Installation in dry envi- Memory space (switching time) 42 ronment. Wiring diagram no. SS-862

Control cabinet installation Type WSUP-S Ref. no. 9577 Voltage 230 V, 1~, 50-60 Hz Weekly autotimer for control Current 1 mA / 20 mV DC cabinet installation Switching contact potential-free changeover Digital autotimer with LCD display 250 V, 1~, 16 A cos j » 1 to automatically control any unit in 2 A cos j » 0.6, µ-contact accordance with the technical da- Protection class IP 20 / II ta. Suitable for switching low-volt- Dimensions mm W 36 x H 90 x D 69 age or low currents through a Installation DIN rail mounting standard, gilded µ-contact. control cabinet Installation in dry environment or Temperature range -30° C to +55° C with occasional condensation. Memory space (switching time) 56 Wiring diagram no. SS-1038

527 Measure Control · Regulate Reversing, speed and operation switches Isolation switches

Reversing switch Type WS Ref. no. 1271 Current AC 3 / 5.5 kW / 12 A (ind.) To change air flow direction of Voltage 230 V, 1~, 50/60 Hz For surface and flush mounting 1 ph. and 3 ph. axial high perform- 400 V, 3~, 50/60 Hz ance fans. Installation: Surface or Protection class IP 54 flush mounted (switch box is in- (when flush mounted IP 30) cluded as standard). With screw Wiring diagram no. SS-752 fixing (M 3, 60 mm). Similar to Weight approx. 0.4 kg product pages the units are speci- Dimensions mm W 91 x H 121 x D 109 fied in the model chart. – when flush mounted W 72 x H 72 x D 35 Casing polymer, light grey

Reversing, speed and Type DSEL 2 Ref. no. 1306 Two switch rockers with symbols on / off switch 1. Speed changeover switch for speed change or reverse oper- and on / off switch of fans with ation delivered as standard. Colour Installation in FM switch box two speed steps such as ELS-V pure white. 60/35, -VN 100/60. Current 3 A (ind.) 2. Reverse switch for changing Voltage 230 V, 1~, 50/60 Hz the air flow direction of reversible Protection class IP 30 fans (for supply and extract air) Installation in standard FM box and on / off switch. Wiring diagram no. – two speed SS-827 Similar to product pages the units – reverse operation SS-828 are specified in the model chart. Dimensions mm W 80 x H 80 x D 15 Weight approx. 0.1 kg

Three speed and operating Convenient flush mounted speed Type DSEL 3 switch with 0 position switch for fans with three speed Current 3 A (ind.) steps. Cannot be parallel wired Protection class IP 30 Installation in FM switch box with the light switch Installation in standard FM box Voltage 230 V, 1~, 50/60 Hz Wiring diagram no. see fan model Weight approx. 0.1 kg Dimensions mm W 80 x H 80 x D 23 Type DSEL 3 Ref. no. 1611 Type DSZ Can be used with the fan models Current AC 3 / 2,2 kW, AC 15 / 6 A ELS-V 100/60/35 and ZEB 380. Protection class IP 20 Type DSZ Ref. no. 1598 Installation in FM box with 55 mm depth Can be used with the central Wiring diagram no. SS-735 extract air box ZEB EC. Dimensions mm W 80 x H 80 x D 23

Speed, operation and Type FR 22/30 Ref. no. 0998 Current approx. 0.8 A (ind.) reversing switch Suitable for fan models GX 225 Voltage 230 V, 1~, 50/60 Hz or 300. Protection class IP 20 For surface and flush mounting For surface and flush mounted Dimensions mm W 210 x H 85 x D 55 installation in dry rooms. Weight approx. 1.2 kg Three sliding switches with follow- Wiring diagram no. SS-497 ing functions: Two pole operation Casing polymer, white switch on/off with operating dis- play, high or low speed and reverse switch (supply/extract air).

Isolation switch Type RS 3+1 7.5 Ref. no. 6387 Technical data – 3 pole with auxiliary contact Plastic casing for flush mounting. Voltage 400 V, 3~, 50/60 Hz for direct starting Locking options in position Operating current 20 A “0 OFF” and “I ON”. Current AC-23 B, 7.5 kW Protection class IP 65 Protection category II Actuation Rotary actuator Temperature range -25 to +60 °C Dimensions mm W 90.5 x H 90.5 x D 102 Weight approx. 0.3 kg Wiring diagram no. SS-1088 Casing UV and weather-resistant

Isolation switch Type RS 6+1 7.5 Ref. no. 6388 Technical data – 6 pole with auxiliary contact Current 20 A, AC-23 B, 7.5 kW Voltage 400 V, 3~, 50/60 Hz for Dahlander windings or Dimensions mm W 90.5 x H 90.5 x D 139 Protection class IP 65 Y/D starting Weight approx. 0.4 kg Protection category II Actuation Rotary actuator Type RS 6+1 11 Ref. no. 6389 Locking options “0 OFF” and “I ON” Current 25 A, AC-23 B, 11 kW Temperature range -25 to +60 °C Dimensions mm B 115 x H 115 x T 163 Wiring diagram no. SS-1088 Weight approx. 0.6 kg Casing UV and weather-resistant for surface mounting

528 Isolator / main switches Pole and reversing switches

Isolation / main switch Type RHS 3+1 Ref. no. 1594 Technical data – 3-pole with auxiliary contact Position “0” is lockable via pad- Voltage 400 V, 3~, 50 Hz lock. Conforms to DIN EN 60204 Current T.1 / VDE 0113-1. Polymer casing – Main contact AC 3 / 5.5 kW 12 A ind. for surface mounting. – Aux. contact AC 3 / 2,2 kW 4 A ind. 3-pole isolator with additional Protection to IP 54 terminals, for single speed and Dimensions mm W 101 x H 126 x D 104 speed controlled fans. Weight approx. 0.35 kg Wiring diagram no. SS-505.2

Isolation / main switch Type RHS 6+2 Ref. no. 1595 Technical data – 6-pole with 2 auxiliary Position “0” is lockable via pad- Voltage 400 V, 3~, 50/60 Hz contacts lock. Conforms to DIN EN 60204 Current AC 3 / 5.5 kW T.1 / VDE 0113-1. Polymer casing Protection to IP 65 for surface mounting. Dimensions mm W 82 x H 82 x D 125 6-pole isolator with 2 additional Weight approx. 0.3 kg terminals, for all pole changing Wiring diagram no. SS-505.3 fans.

Pole switches Surface mounted operation switch Technical data – for separate windings PGWA for pole changing fans. for all types – for Dahlander windings PDA Type Ref. no. Current SS no. Voltage 400 V, 3~, 50/60 Hz For separate windings Protection to IP 65 For surface mounting PGWA 12 5083 AC 3/5.5 kW 12 A 345 PGWA 25 5061 AC 3/11 kW 25 A 345 Type Dim. mm Weight For Dahlander windings B H T kg PDA 12 5081 AC 3/5.5 kW 12 A 7331) P 12 82 82 130 0.4 PDA 25 5060 AC 3/11 kW 25 A 7331) P 25 92 92 140 0.5 1) For motors without thermal contacts: SS-732.

Pole switches Pole switch PGWU / PDU Technical data – for separate windings PGWA Flush mounted operation switch for both types – for Dahlander windings PDU for pole changing fans. Voltage 400 V, 3~, 50/60 Hz Type Ref. no. Current SS No Protection to IP 30 For flush mounting For separate windings Dim. mm Installation depth 87 Excess length 40 PGWU 12 5084 AC 3/5.5 kW 12 A 345 Cover plate 80 x 80 For Dahlander windings Delivery incl. flush mounting box PDU 12 5082 AC 3/5.5 kW 12 A 7331) Weight approx. 0.2 kg 1) For motors with thermal contacts; without thermal contacts: Connection to wiring diagram no. SS-732.

Reverse and pole switch Type PWGW Ref. no. 1281 Technical data – for separate windings PWGW For separate windings for both types – for Dahlander windings PWDA Voltage 400 V, 3~, 50/60 Hz Type PWDA Ref. no. 1282 Current AC 3 / 7.5 kW For surface mounting For Dahlander windings Protection to IP 55 Dimensions mm W 96 x H 105 x D 147 To switch speed and air flow Weight approx. 0.5 kg direction of individual pole Wiring diagram no. for PWGW SS-13 changing fans. Wiring diagram no. for PWDA SS-11 Grey polymer casing.

Speed reversing switches DS 2 Type DS 2 Ref. no. 1351 Technical data On / off and speed reversing for both types – for two speed three phase switch for two speed three phase Voltage 400 V, 3~, 50/60 Hz Y/ -fans. Grey polymer casing for Y/D fans D Current AC 3 / 5.5 kW / 12 A surface mounting. Dimensions mm W 82 x H 82 x D 130 Weight approx. 0.4 kg Protection to, Type DS 2 IP 65 – for two speed alternating Type DS 2/2 Ref. no. 1267 Wiring diagram no. for Type DS 2 SS-87 current fans (SlimVent, RR) On / off and speed reversing switch for two speed 1 ph. fans, RR and Protection to, Type DS 2/2 IP 54 SlimVent SVR, SVS. Wiring diagr. no. for Type DS 2/2 SS-939

529 Measure Control · Regulate Motor full protection Switches and tripping units

I Motor protection For 1 ph. fans Type MW Ref. no. 1579 Regulations and standards with thermal contact leads wired On/off operation via push-button The harmonised European to the terminal block switch. Manual reset function standards and national installa- interference. tion directives require thermal Motor full protection switch MW Volt free auxiliary contact for con- overload protection for electric in polymer casing for surface nection of failure indication alarm. motors. This can be achieved in mounting or installation in fuse 230 V, 1~, 50/60 Hz, applicable from 80 V various ways and depends on board (clamping assembly for Nominal current 0.4 to 10 A the motor specification. support rail). Protection to IP 55 Weight approx. 0.5 kg Dimensions mm W 80 x H 140 x D 95 I Optimal protection is provided Wiring diagram no. SS-517 by thermal contacts (“TK” con- secutively), which monitor the motor winding temperature. For 3 ph. fans with thermal Type MD Ref. no. 5849 These contacts protect also contacts On/off operation via push-button the speed controlled motors. switch. Manual reset function Motor full protection switch M interference. I For low motor powers, the Operation and full protection unit Volt free auxiliary contact for con- thermal contacts are wired in in polymer casing for surface nection of failure indication alarm. series with the motor windings, mounting or installation in fuse 400 V, 3~, 50/60 Hz, applicable from 80 V in other words, they are internal- board (clamping assembly for Nominal current 0.1 to 25 A ly wired. This ensures an auto- support rail). Protection to IP 55 Weight approx. 0.5 kg matic function (resetting after Dimensions mm W 80 x H 140 x D 95 cooling), without the operator Wiring diagram no. SS-518 reacting necessarily on the inter- ference. For pole changing 3 ph. fans Type M 2 Ref. no. 1292 I For motors/fans with higher with separate windings If the thermal contact opens the performances the leads of the and thermal contacts motor disconnects from the supply. thermal contacts or PTC Restarting after interference via thermistor-temperature sensor Motor full protection switch M 2 “0“ position on the switch. are wired to the terminal block Switching and full protection unit and must be connected to the in light grey polymer casing with Voltage 400 V, 50/60 Hz adjacent motor full protection/ control lamp for surface mounting. Power AC 3 / 5.5 kW tripping units. Only under this Nominal current approx. 12 A condition is the warranty claim Protection to IP 55 Weight approx. 1.0 kg valid. Dimensions mm W 170 x H 135 x D 115 Wiring diagram no. SS-142 I Motors/fans without thermal monitoring elements in the For pole changing 3 ph. fans Type M 3 Ref. no. 1293 windings (e.g. IEC norm motors) with Dahlander windings and As M 2, but suitable for pole chang- must be secured on all poles by thermal contacts ing 3 ph. fans with Dahlander wind- a suitable motor protection Motor full protection switch M 3 ings and built-in thermal contacts. switch. Design and functions as M 2. Dimensions mm W 170 x H 135 x D 135 For two speed 3 ph. fans with Wiring diagram no. SS-143 Y/D switching and thermal contacts Type M 4 Ref. no. 1571 Motor full protection switch M 4 As M 3, but suitable for two speed Design and function as M 3. 3 ph. fans with Y/∆ switching and built-in thermal contacts. Wiring diagram no. SS-144

For 3 ph. fans with built-in Type MSA Ref. no. 1289 positive temperature coefficient For thermal protection of electric thermistors (PTC temperature motors (even explosion-proof sensors) for thermal motor electric motors) according to protection. Specified for use in Directive 2014/34/EU (ATEX) speed controlled, explosion with integrated PTC temperature proof fans. sensors according to DIN 44081 and DIN 44082. Motor full protection switch MSA Tripping unit with manual reset for Voltage 230 V ± 15 %, 50/60 Hz 1 to 6, PTC thermistors wired in 3 phase operation via contactor series. Current at 230 V 3 A AC 15 Connection options 1 to 6 PTC ther- If the nominal response tempera- mistors in series ture in PTC thermistors reaches a Tested by Physikalisch-Technische set limit the built-in relay discon- Bundesanstalt, according to nects the motor. The fault is indi- DIN EN 60079-14 / VDE 0165-1, I Information Page cated by a light emitting diode. DIN EN 60079-0 / VDE 0170-1, Restarting via pressing the “Reset” DIN EN 60079-17 / VDE 0165-10-1. Technical information 15 on button or an external switch. Cas- Protection to IP 20 Transformer controllers with ing made of polymer, suitable for Weight approx. 0.2 kg motor full protection unit fuse board installation on support Dimensions mm W 35 x H 90 x D 58 – for 1 ph. motors MWS 532 rail according to DIN EN 60715. Wiring diagram no. SS-325.1 – for 3 ph. motors RDS 533

530 Electronic speed controller for 1 ph. fans, 230 V, 50/60 Hz

I Electronic speed controller For surface mounting Type ESU 1 Ref. no. 0236 for stepless speed control 230 V / 3 ph. Max. load 1 A of single phase fans Type ESU 3 Ref. no. 0237 I Multiple, different fans can be Max. load 2.5 A (T 40 E) operated with a controller up to White polymer casing. Installation the full load capacity. A reserve Operation display via illuminated of 10% must be considered ring. when calculating. Minimum current 0.15 A I The minimum output voltage Protection to (installed) IP 30 can be adjusted to motor char- Wiring diagram no. SS-556.1 acteristics via potentiometer. Dimensions mm W 80 x H 80 x D 21 protr. Values must not fall below the lower limit for liquid motor start-up! Type ESU 5 Ref. no. 1296 I Overload protection from built-in Max. load 5 A (T 40 E) fine wire fuse. (for install. in lightweight walls 4 A) I Additional connection of indica- White polymer casing. The double- tor lights or shutter possible via box required for flush mounting is unregulated output. included in the scope of delivery. I Corresponds to EMC guidelines, Minimum current 0.2 A DIN EN 50370, DIN EN 61000 / Protection to IP 20 VDE 0838, DIN EN 55014, Wiring diagram no. SS-165 DIN EN 60669. Dimensions mm W 81 x H 152 x D 40

I Version ESU 1 and ESU 3 For surface mounting Type ESA 1 Ref. no. 0238 A HELIOS innovation 230 V / 1 ph. Max. load 1 A I Both types are compatible with Type ESA 3 Ref. no. 0239 the standard light switch pro- Max. load 2.5 A (T 40 E) grammes of many manufac- White polymer casing. turers. Operation display via illuminated Thus, the speed controller can ring in control knob. be integrated in the existing Minimum current 0.15 A switch programme on-site. Protection to IP 40 Colour matching is also not a Wiring diagram no. SS-556.1 problem. Frame, central insert Dimensions mm W 80 x H 80 x D 65 and rotary knob are taken from the “dimmer programme“ of the switch series and connected. Type ESA 5 Ref. no. 1299 I Standard delivery includes: Max. load 5 A (T 40 E) Controller insert, flush mounted Light grey polymer casing, facia cover plate and rotary knob plate anodied aluminium. made from white polymer. Minimum current 0.2 A I Operating display through cir- Protection to IP 44 cumferential light ring on rotary Wiring diagram no. SS-165 knob. Dimensions mm W 84 x H 170 x D 40

I Surface mounted models – Attractive, totally closed casing of polymer. – ESA 1 and ESA 3 with For surface mounting, Type BSX Ref. no. 0240 illuminated control knob. with reversing switch Max. load 1 A (T 40 E) 230 V / 1 ph. Surface mounted speed controller Suitable for fan models: with reversing switch for reversible I Important note HVR 150/2 RE, REW 150 fans (intake/extract) in a white I Only motors which are suitable and 200, range HV. polymer casing. Only suitable for speed control via electronic H 200/4 and 250/4 and for fans, that are reversible via control should be used. window fans GX. reversing switch. Minimum current 0.15 A Protection to IP 40 I Electronic speed controllers Wiring diagram no. SS-480.2 which operate on the phase Dimensions mm W 80 x H 80 x D 65 control principle, can create humming noises which can For fuse board installation Type ESE 2.5 Ref. no. 1302 be considered disturbing in the 230 V / 1 ph. Max. load 2.5 A (T 40 E) lower speed/voltage range. For installation in fuse boards Silent transformer controllers (35 mm standard buzzbar profile should be used for noise-critical and for 68 mm built-in range). applications. Minimum current 0.1 A Protection to IP 20 Wiring diagram no. SS-376 Dimensions mm W 50 x H 85 x D 60 (there from 10 mm protruding)

531 Measure Control · Regulate Transformer speed controllers with and without motor full protection for 1 ph. alternating current fans, 230 V, 50/60 Hz

I Five step transformer speed For surface mounting Mini speed controller TSW 0.3 controller for speed control- Max. load 0.35 A Compact five step speed controller ling of 1 ph. alternating 1 ph. alternating current, 230 V with on/off switch for surface current fans mounting in dry rooms. Polymer casing, white. I Suitable for power control of all speed controllable 1 ph. Type TSW 0.3 Ref. no. 3608 alternating current fans. max. load 0.35 A Protection to IP 20 I Four secondary voltages Dimensions mm W 160 x H 85 x D 60 stepped in 80 / 100 / 130 / 170 Wiring diagram no. SS-496.1 and 230 V (full mains voltage) allow to control 5 fan speeds. For surface mounting Transformer speed contr. TSW I A number of different fans can 1 ph. alternating current, 230 V For one or more alternating be connected to one controller current fans. up to its nominal load. Type Ref. I max. Dim. in mm no. A B H T TSW 1.51) 1495 1.5 154 200 79 I Advantages TSW 3.01) 1496 3.0 154 200 148 – Good cost effectiveness. 2) – Reliable. TSW 5.0 1497 5.0 200 254 167 – Low loss and low noise fan TSW 7.52) 1596 7.5 200 254 167 operation. TSW 10 2) 1498 10.0 200 254 167 – MWS-, TSW- (from the model Wiring diagram no. 1) SS-960 2) SS-437.1 TSW 1.5) and STSSW models with full power output for con- For switchboard installation Speed control transformer nection with the signal lamp 1 ph. alternating current, 230 V TSSW or shutter. Built-in transformer with rail and terminals for 5 output voltages. I Design for surface mounting Type Ref. I max. Dim. in mm units no. A B H T H – Robust ISO casing, light grey, TSSW 1.5 6520 1.5 78 90 78 made of impact resistant TSSW 3 6521 3.0 84 94 92 polymer. Protection to IP 54. TSSW 5 6522 5.0 105 111 87 – Built-in operating switch for five TSSW 10 6523 10.0 120 122 112 speed steps and on/off function. B – Operation display via control Wiring diagram no. SS-268 lamp. – Fully impregnated transformers Five step operating switch T 40 E. STSSW Accessory for control – Conforms to DIN VDE 0550. transformer TSSW for 230 V, 1 ph. – Max. permitted ambient fans. For switchboard installation temperature +40 °C. with front fixing and front panel. – Delivered ready for installation, Connections are deepened. simple connection to terminal block. Type STSSW Ref. no. 0234 Voltage AC 3, 230 V I Design for built-in max. load 2,2 kW transformers Installation depth 70 mm, 46 mm – Built-up terminal block for five Wiring diagram no. SS-548 voltage outputs. – Attached fixing brackets for With motor full protection facility Transformer speed controller simple fixture. 1 ph. alternating current, 230 V MWS with motor full protection – Fully impregnated transformers For surface mounting facility T 40 E. Five step speed controller with integrated tripping unit for 230 V, I Accessories 1 ph. fans. Six step cam switch, model To connect thermal contacts wired STSSW for switch board to the terminal box. A number of installation, with front mounting fans can be controlled up to the plate. nominal load. If a thermal contact trips all fans will be disconnected. Step switch and control lamp in- cluded. Restarting via “0” position after interference or power cut off.

Type Ref. I max. Casing IP 54 Dimensions in mm Weight no. A made of W H D kg MWS 1.5 1947 1.5 Polymer 200 254 98 3.0 MWS 3 1948 3.0 Polymer 200 254 98 4.0 MWS 5 1949 5.0 Polymer 200 254 167 5,3 MWS 7.5 1950 7.5 Polymer 236 316 188 10.0 MWS 10 1946 10.0 Polymer 236 316 188 13.5 Connection according to wiring diagram no. SS-440.4

532 Transformer speed controllers with and without motor full protection for 3 ph. alternating current fans, 400 V, 50/60 Hz

I Five step transformer speed controller for speed control- ling of 3 ph. alternating current fans

I Suitable for speed control of all speed controllable 3 ph. alter- nating current fans, for Y/∆ reversible switching models in higher steps.

I Four secondary voltages stepped in 80 / (115)* / 140 / 200 / 280 and 400 V (full mains For surface mounting Speed control transformer TSD voltage) allow to control 5 fan 3 ph. alternating current, 400 V As TSW, but for 3 phase fans. speeds. Type Ref. I max. Dim. in mm * On TSD internally adjustable no. A W H D for voltage controllable, explo- TSD 0.8 1500 0.8 200 254 167 sion proof in-duct and roof fans. TSD 1.5 1501 1.5 200 254 167 TSD 3.0 1502 3.0 200 254 167 I A number of different fans can be connected to one controller TSD 5.5 1503 5.5 300 300 150 up to its nominal load. TSD 7.0 1504 7.0 300 300 150 TSD 11.0 1513 11.0 300 400 200 Wiring diagram no. SS-436.2 I Advantages – Good cost effectiveness. For switchboard installation Speed control transformer TSSD – Reliable. 3 ph. alternating current, 400 V As TSSW, but two transformers – Low loss and low noise fan without casing, in V switching. T operation. Type Ref. I max. Dim. in mm – RDS-, TSD- and STSSD no. A W H D models with full power output TSSD 1 6516 1.0 84 95 80 for connection with the signal TSSD 2 6517 2.0 96 104 92 H lamp or shutter. TSSD 4 6518 4.0 105 112 98 I Design for surface mounting TSSD 7 6519 7.0 120 122 134 units TSSD 11 6515 11.0 150 146 158 B – Robust ISO casing, light grey, Wiring diagram no. SS-267.1 made of impact resistant polymer. Protection to IP 54. 5 step operating switch STSSD Models from RDS 7 and Suitable for control of transformer TSD 5.5 made of steel, double TSSD for 400 V, 3 ph. fans. For painted, protection to IP 65. switchboard installation with front – Built-in operating switch for five fixing and front panel. Connections speed steps and on/off func- are deepened. tion. – Operation display via control Type STSSD Ref. no. 0235 lamp. Voltage AC 3, 400 V – Fully impregnated transformers max. load 5.5 kW T 40 E, protection class II. Installation depth 110 mm, 46 mm – Conforms to DIN VDE 0550. Wiring diagram no. SS-549.1 – Max. permitted ambient temperature +40 °C. With motor full protection facility Transformer speed controller – Delivered ready for installation, 3 ph. alternating current, 400 V RDS with motor full protection simple connection to terminal For surface mounting facility block. Five step speed controller with integrated thermal contact tripping I Design for built-in unit for 400 V, 3 ph. alternating transformers current fans. – Two transformers in V switching To connect thermal contacts wired ensure the functions as described to the terminal box. A number of above. fans can be controlled up to the – Built-up terminal block for five nominal load. voltage outputs. If a thermal contact trips all fans – Attached fixing brackets for will be disconnected. simple fixture. Step switch and control lamp in- – Fully impregnated transformers cluded. Restarting via “0” position T 40 E. after interference or power cut off. – Contactors and external wiring to be supplied onsite. Type Ref. I max. Casing IP 54 Dimensions in mm Weight no. A made from W H D kg I Accessories RDS 1 1314 1.0 Polymer 236 316 128 6.0 Five step switch STSSD for RDS 2 1315 2.0 Polymer 236 316 128 9,7 fuse board installation, with RDS 4 1316 4.0 Polymer 236 316 128 10.5 front board. RDS 7 1578 7.0 Steel 300 300 150 21.0 RDS 11 1332 11.0 Steel 300 400 200 26.0 Designed to comply with VDE 0550, fully impregnated transformers in V switching. Max. permitted ambient temperature +40 °C. Wiring diagram no. SS-139.

533 Measure Control · Regulate Transformer control systems temperature-controlled, five-step

I Five-step climate transformer controller KTRW and KTRD I Trouble-free, low-loss trans- TME 1 former controller for tempera- ture-dependent fan control in- or KTRW MW cluding full motor protection. TME 4 Fan I Recommended for noise critical KTRD MD applications. or I Control via an electronic thermo- stat type TME 4 or EST to be or- EST dered separately as accessory. Alarm

For single phase fans Climate transformer controller Type Ref. no. I max. Dim. in mm 1 ph., 230 V, 50/60 Hz KTRW 230 V A B H T For automatic control of one or KTRW 3 1662 3 236 316 128 several 1 ph. fans in relation to the Voltage 230 V~, 50/60 Hz room temperature. Protection class IP 54 Five-step automatic operation, Max. ambient temperature +40 °C whereby each step can also be Wiring diagram no. SS-674 switched manually. Integrated full motor protection by connecting the thermal contacts on the motor. Suitable for stable ventilation. Light grey polymer casing.

For three phase fans Climate transformer controller Type Ref. no. I max. Dim. in mm 3 ph., 400 V, 50/60 Hz KTRD 400 V A B H T For automatic control of five step KTRD 3 1650 3 300 500 200 3 ph. fans in relation to the room KTRD 5.5 1651 5.5 300 500 200 temperature. The built-in operating switch also allows manual control. KTRD 10 1652 10 400 500 200 Integrated full motor protection by KTRD 15 1653 15 400 500 200 connecting the thermal contacts Voltage 400 V, 3~, 50/60 Hz on the motor. Protection class IP 54 Robust casing made of steel, dual Max. ambient temperature +40 °C coating in light grey. Wiring diagram no. SS-676.1

I Accessories for KTRW Electronic four step thermostat Type TME 4 Ref. no. 1335 and KTRD with a switching sequence of 1 K Voltage 230 V~, 50/60 Hz for adjusted setpoint. Enables five Max. continuous current (AC 3) 6 A Four-step electronic thermostat step temperature-controlled fan Temperature range 0 to +50 °C For temperature-dependent control operation in combination with the Switching precision +/- 0.8 K at 20 °C of a KTR transformer controller or climate controller KTR in relation Switching distance 1 K for on/off operation of up to four to the pre-set setpoint and actual Protection category II single phase fans. temperatures. Protection class IP 54 (Supply voltage 230 V required. Robust casing made of impact- Dim. mm W 120 x H 80 x D 75 resistant, light grey polymer. Weight approx. 0.4 kg Cable entry at the bottom of the Wiring diagram no. SS-702 casing in PG 11.

Electronic control thermostat I Displays Type EST Ref. no. 1355 EST – Displays for operation mode, Voltage 230 V, 1~, 50/60 Hz with various control variables room temperature, outside tem- Protection class IP 54 to control a climate transformer perature and adjusted setpoint Transf. connection 230 V AC / max. 10 A controller KTR. temperature. Temperature range (adjustable) 0 – 40 °C – Signal LED for soft-closing mech- Control range (adjustable) 2 – 12 K Control functions anism. Alarm low temp. (adjustable) -20 – 0 K – Temperature dependent, five- – Alarm signal LED for insufficient, Alarm high temp. (adjustable) 0 – 25 K step fan control via KTR units. excessive temp., system error. Heating (adjustable) -15 – +5 K Limitation of control range pos- – Scaled LED display (0–100 %) Outside temp. compensation 0 – 20 K sible by selecting a minimum for fan speed and opening of Min. air rate approx. 0 – 40 % and maximum air rate (voltage). shutter. Max. air rate approx. 60 – 100 % Minimum air rate can be I Temperature sensor Disable minimum air speed -25 – 0 K switched on and off. An outside and an inside tem- Dim. mm W 260 x H 215 x D 120 – Ventilation damper control perature sensors are included as Weight approx. 2.0 kg (analogue 0...10 V) standard. Casing protected to IP Wiring diagram no. SS-357.3 – Control of a frequency inverter 55, installation up to 100 m dis- (analogue 0...10 V) tance from controller, connection – Heating thermostat by means of NYM 3 x 1.5 mm2. – Temperature monitor (insufficient I Possible settings – Stepless temperature specifica- I Casing and excessive temperatures – Stepless specification of set- tion for activation of heating. Polymer, light grey with transpar- with outside air temperature point temp. and control range. – Stepless specification for alarm ent hinged lid, for surface instal- compensation). – Min. / max. power (speed) limit. signal for low and high tempera- lation. – Adjustments made via a dirt- – Min. air flow vol. can be on/off. tures. resistant membrane keypad. – Soft-closing mechanism on/off. – Min. and max. shutter opening.

534 Electronic speed controller for 3 ph. fans 400 V, 50/60 Hz Electronic transformer controller for 1 ph. fans 230 V, 50/60 Hz

ESD ETW

With these speed controllers, I Specification ESD I Specification ETW I Overload protection Helios offers a simple solution Convenient, stepless, electronic Seven-step electronic trans- ETW types are protected by connecting the fans and speed controller for 3 ph. fans, former control unit for speed against permanent overload by central building management which can be controlled via control of 1 ph. fans. Robust a built-in temperature switch. systems specified by the cus- phase control through voltage and low-loss power units for When the overload protection tomer! reduction (except KVD Ex types). ventilation systems controlled trips, the unit switches automati- Latest technology through use by central building management cally to direct supply. I Common features of micro-controllers. systems. After cooling down, the unit I Control via analogue 0–10 V switches back to normal opera- on-site input signal, electronic I Possible settings / Display I Possible settings / Display tion. The interference can or control system EUR 6 C or I On/off and stepless speed I Built-in operating switch allows should be signalised via the out- other controllers. selection via rotary poten- on, off and direct supply switch- put to an on-site alarm system. I A number of different fans can tiometer. ing. be controlled by one controller I 0–10 V input. Thus, remote I Power step allows I Casing up to its maximum load. control possible with on-site manual operation of steps (1–7) I Polymer casing, light grey. I Several controllers can be con- rotary potentiometer (22 kOhm). or automatic operation. trolled in parallel by a central I 3 ph. phase monitoring, protec- In “auto” mode, the transformer building management system tion against phase failure. control unit is automatically con- that allows the ventilation to be I Smooth start-up function. trolled by the on-site ventilation distributed to several fans or fan I Automatic minimum initial control. units and therefore in several voltage 80 V. I The operating step is displayed circuits. I Fulfils EMC requirements by a LED. class B, shielded cable not re- I The built-in minimum air volume I Accessories for both series quired between unit and motor. switch can be totally switched An universal control unit with I LEDs as status and fault display. off from the ventilation controller 10 V output can be used if the I Integrated protection for elec- via the analogue input. fans are not controlled by a tronics against overload. central building management I Full motor protection by moni- system. toring the thermal contacts of motors. Type EUR 6 C Ref. no. 1321 See electro nic control system page I Casing for description. I Polymer casing, light grey with wide cooling element. I Can be used directly even in dirty areas (e.g. kitchen) due to protection class IP 65. I Dimensions Type Dim. in mm Weight kg H W D ETW 5 315 240 210 8 ETW 10 315 240 210 10 I Model range I Model range Type Ref. no. Output Power con- Wiring Dimensions Cooling Weight Protec- Type Ref. no. Output Output voltages Wiring Protection current sumption diagram element tion current Step diagram to H W D width to – — ˜ ™ š › œ A kW No. mm mm mm mm kg IP A V No. IP For three phase fans, 3~, 400 V, 50/60 Hz For single phase fans, 1~, 230 V, 50/60 Hz ESD 5 0501 5.0 2.2 831 160 115 165 23 1.5 65 ETW 5 1263 5.0 80 95 115 135 165 195 230 683 54 ESD 11.5 0502 11.5 5.5 831 160 160 165 68 1.7 65 ETW 10 1264 10.0 80 95 115 135 165 195 230 683 54

535 Measure Control · Regulate Frequency inverter for alternating current fans 3 ph., 400 V, 50/60 Hz

FU-B and FU-BS FU-C and FU-CS

on on 400 V~ off 3 ~ 400 V~ off °C °C p m/s Motor 0-10 V 0-10 V 3 ~ TK KL oderor 0-20 mA Motor 0-20 mA n motors FU-B n Motoren FU-C n motors oroder upbis to I max.l max. oroder n Motoren FU-BS 3 ~ FU-CS upbis to I lmax. max. Motor 3 ~ Motor PU/A oroder PU/A oroder TK KL oderor TK KL 0-10V oderor

I Specification I Specification I Specification I Specification FU-B “Basic” FU-BS “Basic-Sine” FU-C “Comfort” FU-CS “Comfort-Sine” I Frequency inverter FU-B in basic I Frequency inverter FU-BS in I Frequency inverter FU-C in I Frequency inverter FU-CS in design without sine filter to con- basic design with built-in sine comfort design without sine filter comfort design with built-in sine trol the speed of a single fan. filter effective on all poles. to control the speed of a single filter effective on all poles. I Speed specified by a 0-10 V I To control the speed of one or fan. I To control the speed of one or control signal (e.g. potentiome- more fans. The permitted num- I Includes display and three but- more fans. The permitted num- ter PU/PA, accessories). ber of fans is calculated from tons to set the fan and control ber of fans is calculated from I Maximum line length between the maximum FU current. parameters. the maximum FU current. FU-B and fan 10 m with shield- I The speed is specified by a I Parameters can be set and unit I Includes display and three but- ed lines. 0-10 V control signal (e.g. poten- can be controlled via modbus. tons to set the fan and control I The fan must be designed for tiometer PU/PA, accessories). I With built-in, fully-fledged control parameters. operation with a frequency in- I Line lengths between FU-BS system for temperature, pres- I Parameters can be set and unit verter (suitable EMC fan / motor, and fan greater than 10 m are sure and air speed. The required can be controlled via modbus. possibly with a special design). possible. sensors LDF 500, LGF 10, LT.. I With built-in, fully-fledged control I The FU-B is fixed to its nominal I No additional EMC shielding of can be delivered as accessories system for temperature, pres- current. the electrical lines required. (see page EUR 6 C). sure and air speed. The required I For FU-B operation (without sine The fans, including motor, do I Speed specified by a 0-10 V sensors LDF 500, LGF 10, LT.. filter), the suitability for the fre- not require any specific EMC control signal (e.g. potentiome- can be delivered as accessories quency inverter must be stated precautions to operate the fre- ter PU/PA, accessories) or (see page EUR 6 C). when ordering the fan. quency inverter. direct entry on the display. I See FU-BS description for I The FU-BS is fixed to its nomi- I Line length and suitability of the speed specification, line length, nal current. fan for operation with frequency EMC precautions. I When using the frequency in- inverter, see FU-B description. I When using the frequency in- verter with a built-in sine filter, I For FU-C operation (without sine verter with a built-in sine filter, conventional standard fans / filter), the suitability for the fre- conventional standard fans / motors can be used. quency inverter must be stated motors can be used. when ordering the fan.

FU-B and FU-BS FU-C and FU-CS Analogue inputs 1 x 0-10 V, Ri 100 kOhm or 0-20 mA Analogue inputs 2 x 0-10 V, Ri 100 kOhm or 0-20 mA, or KTY Logic inputs 1 x digital 24 V, release Logic inputs 2 x digital 24 V, function parametrisable Analogue output — Analogue output 1 x 0-10 V DC, 10 mA Relay output 1 x closing contact 250 V / 2 A ind. Relay output 2 x changeover contact 250 V / 2 A ind. Power supply for modules 1 x 10 V DC, 10 mA, 1 x 24 V DC, 70 mA Power supply for modules 1 x 10 V DC, 10 mA (in analogue output), 1 x 24 V DC, 70 mA Motor temp. monitoring Thermal contact or PTC thermistor Motor temp. monitoring Thermal contact or PTC thermistor

536 Frequency inverter FU for alternating current fans 3 ph., 400 V, 50/60 Hz

I General properties I Type-based properties I Information I Design motor current / I Inverter specially designed for Basic types: I Internal sine filter effective on frequency HLK use. I Additional voltage supply: 24 V all poles (types FU-..S) When selecting the right fre- I Saves energy thanks to stepless DC / 70 mA for wiring digital Filters the voltages between the quency inverter, the maximum speed adjustments. inputs and additional external individual phases and string volt- motor current is to be used as a I Specially tailored to the fan mo- components. age between phase and protec- starting point. When operating tor, i.e. minimal energy con- Sine types: tive conductor. Thus the output multiple fans, the sum of the in- sumption and noise in partial I Includes internal sine filter voltage of the frequency inverter dividual currents is to be used load operations. effective on all poles. is purely sinusoidal and matches To prevent faults and failures, a I Use of zero-maintenance alter- I For the simple, subsequent en- the quality of a standard mains 10% reserve should be included nating current asynchronous hancement of existing ventilation voltage. in the plans. A maximum fre- motors with all construction de- systems. I Ground fault circuit inter- quency of 50 Hz must not be signs and powers. Comfort types: rupters (all types) exceeded when controlling the I No power restriction when using I Free specification of the acceler- When using the frequency in- speed of a series fan, as other- standard motors. ation and delay times to reduce verter in an environment that re- wise the motor will be over- I Operating notification via poten- noise on start-up. quires a ground fault circuit in- loaded and broken. tial-free contact. I Additional voltage supply: 24 V terrupter, this must match type A higher-frequency operation is I Potentiometer voltage supply: DC / 120 mA for wiring digital B+, 300 mA sensitive to univer- only possible upon request. E.g. 10 V DC / 10 mA for poten- inputs and additional external sal currents. I Motor protection tiometer with 10 kOhm components. I EMC Maximum motor protection is I Analogue input for speed speci- I Easy to adjust and control All FU types comply with the achieved through monitoring fication (0-10 V, 0(4)-20 mA). values using the display EMC Dir. 2004/108/EG and the (thermal contacts / PTC thermis- I Short-circ.-proof and grounded. I Extensive diagnostic display in applicable standards such as tors); a maximum of 6 PTC ther- I Built-in electronic motor protec- case of an error. DIN EN 60335-1 and DIN EN mistors can be connected to the tion via thermal contacts or PTC I Speed specification directly on 550011. Radio interference fil- device in series. It is possible to thermistors. the device via the display. ters are built in to ensure cl. B increase the number of PTC I Electrically isolated control unit. I Serial interface RS 485 / Mod- (res. area). For FU-B and FU-C, thermistors by using monitoring I Overvoltage protection bus-RTU. the line between the fan and fre- devices (type MSA, acces- I Also suitable for installation into I Adjustment of performance quency inverter must be shield- sories). a control cabinet. according to needs and config- ed and must be no more than I At amb. temp. of 40 °C – 55 °C, urable parameters. 10 m long. Motor supply/temp. consider a loss of performance. monitoring lines laid separately.

Type Ref. no. Max. power Cable cross section Wiring Dimensions Weight I Accessories for all FU types Output Motor from mains to motor diagram net current cable Height Width Depth approx. PU 24 / PA 24 No. 1736/1737 A kW mm2 No. mm mm mm kg Speed potentiometer, flush / sur- Basic design without sine filter for 3 ph. AC fans, 400 V, 50/60 Hz, protection to IP 54 face, LED 24 V, Poti 10 V / 1.3-10 V FU-B 3.6 5453 3.6 1.5 4 x 1.51) 1020 284 240 115 2.6 SU-3 10 / SA-3 10 No. 4266/4267 1) FU-B 5.0 5454 5.0 2.2 4 x 1.5 1020 302 250 196 4.6 Three-step speed switch, FU-B 7.0 5455 7.0 3.0 4 x 1.51) 1020 302 250 196 4.7 flush / surface, 10 V / 1.7-10 V FU-B 8.5 5456 8.5 4.0 4 x 1.51) 1020 302 250 196 5.6 FU-B 12 5457 12.0 5.5 4 x 1.51) 1020 302 250 196 5.7 Type WSUP Ref. no. 9990 Week timer with LCD-display, FU-B 17 5458 17.0 7.5 4 x 1.51) 1020 302 250 196 5.9 potential-free contact Basic design with all-pole sine filter for 3 ph. AC fans, 400 V, 50/60 Hz, protection to IP 54 FU-BS 2.5 5459 2.5 2) 4 x 1.5 1028 284 240 115 2.7 Type WSUP-S Ref. no. 9577 FU-BS 5.0 5460 5.0 2) 4 x 1.5 1028 302 250 196 5.2 Week timer potential-free contact, FU-BS 8.0 5461 8.0 2) 4 x 1.5 1028 302 250 196 6.3 for DIN rails FU-BS 10 5462 10.0 2) 4 x 1.5 1028 302 250 196 6.8 Type EDR Ref. no. 1437 FU-BS 14 5463 14.0 2) 4 x 1.5 1028 302 250 196 6.9 Electronic differential pressure con- Comfort design without sine filter for 3 ph. AC fans, 400 V, 50/60 Hz, protection to IP 54 troller 0-1000 Pa, 10-24 V / 0-10 V FU-C 4.2 5865 4.2 1.5 4 x 1.51) 1030 302 250 195.5 6.4 FU-C 8.5 5868 8.5 4.0 4 x 1.51) 1030 302 250 195.5 7.3 Type ETR Ref. no. 1438 Electronic temperature controller FU-C 12 5869 12.0 5.5 4 x 1.51) 1030 302 250 195.5 7.5 (sensor see accessory ETR) FU-C 17 5870 17.0 7.5 4 x 2.51) 1030 302 250 195.5 7.5 FU-C 25 5464 25.0 11 5 x 4.01) 1030 355 280 239 12.5 Type EUR EC Ref. no. 1347 FU-C 32 5465 32.0 15 4 x 6.01) 1030 524 386 283 24.5 Electronic universal controller FU-C 39 5466 39.0 18.5 4 x 10.01) 1030 524 386 283 26.3 (sensor see accessory EUR EC) FU-C 46 5467 46.0 22 4 x 10.01) 1030 524 386 283 26.3 Type MSA Ref. no. 1289 1) FU-C 62 5468 62.0 30 4 x 16.0 1030 524 386 283 26.3 Full motor protection for PTC ther- Comfort design with all-pole sine filter for 3 ph. AC fans, 400 V, 50/60 Hz, protection to IP 54 mistor FU-CS 2.5 5871 2.5 2) 4 x 1.5 1032 284 240 115 3.3 FU-CS 8 5873 8.0 2) 4 x 1.5 1032 302 250 195.5 7.9 I General technical data Mains voltage 3~, 208 – 480 V FU-CS 10 5874 10.0 2) 4 x 1.5 1032 302 250 195.5 8.2 Mains frequency 50/60 Hz FU-CS 14 5875 14.0 2) 4 x 1.5 1032 302 250 195.5 8.7 Output voltage 95 % of Umains FU-CS 18 5469 18.0 2) 4 x 2.5 1032 302 250 196 9.1 Output frequency 50 Hz FU-CS 22 5470 22.0 2) 5 x 4.0 1032 355 280 239 14.5 Protection class IP 54 FU-CS 32 5471 32.0 2) 4 x 6.0 1032 525 386 283 29.6 Ambient temperature 0 to +40 °C (–20 °C not currentless) FU-CS 40 5472 40.0 2) 4 x 10.0 1032 525 386 283 29.6 FU-CS 50 5473 50.0 2) 4 x 16.0 1032 525 386 283 32.8 1) max. 10 m shielded, motor supply and motor protection laid separately 2) The max. current for all connected fans is decisive for design

537 Measure Control · Regulate Electronic control system EUR 6 C 1~, 230 V, control variables: Temperature, pressure, air velocity

I Universal controller EUR 6 C EUR 6 C Electronic control unit with power supply unit on the phase control principle.

I Area of application For control of central ventilation systems or for stepless control of one or more speed control- lable 1 ph. fans. In domestic, commercial, indus- trial and agricultural applications.

I Control functions Simple and quick start-up of pa- rameters via integrated “startup wizard”. Depending on the con- nected sensor a control can be carried out according to follow- ing control variables: – Manual speed control, e.g. adjustable via keyboard – Temperature (required accesso- ry temperature sensor LTR 40 or LTK 40) – Temperature with additional functions pre-programmed, Inputs: Mode 2.03: Temperature control with additional function (required accessory temperature – 2 x sensor inputs, programma- Mode 2.05: Differential temperature control sensor LTR 40 or LTK 40) ble on the respective necessary – Differential temperature con- sensor type TK trol (required accessory temper- – Connection of thermal contacts °C VentilatorFan for motor protection ature sensor LTR 40 or LTK 40) or – Differential pressure (required The whole system stops when a oder EUR 6 C 0-10V DC accessory differential air pres- thermal contact TK trips. It must °C * sure sensor LDF 500) be restarted manually once the – Differential pressure with out- motor has cooled down. on K1/K2 side air temperature compen- – 2 x digital inputs, programmable E.g.z.B. off Alarm sation (required accessory diff- ro release, external interference, ferential air pressure and tem- limit on/off, switching night * e.g. for shutter, frequency inverter perature sensor LDF 500 and reduction, internal/external, Mode 4.01: Differential pressure control LTR 40 or LTK 40). Ideal for cen- control/manual operation, reset, Mode 6.01: Air velocity control tral ventilation systems accord- max. speed on/off ing to DIN 18017 in residential TK construction. Possible settings P VentilatorFan – Stepless selection of setpoints – Air velocity (required accessory oderor EUR 6 C air velocity sensor LGF 10) and control range 0-10V DC – Min./max. power (speed) limit m/s * The required sensor is to be or- – On/off switching of minimum air on dered separately as an accessory. flow volume K1/K2 – Switching e.g. heating via pro- E.g.z.B. off The control ranges are freely ad- Alarm justable within the sensor’s range. grammable relay – Stepless selection for alarm indi- * e.g. for shutter, frequency inverter The aligned output voltage accord- cation at low and high tempera- ing to nominal value and current ture, output on display or addi- Type EUR 6 C Ref. no. 1321 I Necessary accessories value is between 0 % (35 V) to tionally on relay Voltage 230 V~, 50/60 Hz 100 % (approx. 80 V – 230 V). – Min. and max. shutter opening max. current 6 A Type LDF 500 Ref. no. 1322 The specification of minimum and – Reverse control functions Required minimum current 0.2 A Differential air pressure sensor maximum values is possible. – Continuous control of ventilation Controlled output voltage 0 – 100 % Range 0 – 500 Pa dampers Control range temperature 0 – 40 °C – Main switch with positions: – Adjustments made via a dirt- Control range pressure 0 – 500 Pa Type LGF 10 Ref. no. 1325 “0” = Controller off resistant membrane keypad. Control range velocity 0 – 10 m/s Air velocity sensor “I” = Automatic operation Permitted ambient temp. 0 to +40 °C Range 0 – 10 m/s “230 V” = uncontrolled direct I Display Protection class IP 54 supply. – Multi-function LC display Casing surface mounted installation, Type LTA 40 Ref. no. 1336 – Numerical setpoint and actual polymer, light grey Temperature sensor for outside Inputs and outputs: value display with scale Dim. mm W 223 x H 200 x D 131 Range –20 to +60 °C Outputs: – Symbols (alarm, heating, Weight approx. 1.4 kg Protection class IP 54 – 1 x motor connection based on release) Wiring diagram no. SS-911 phase control principle – Bar graph/level indicator Type LTK 40 Ref. no. 1324 – 1 x analogue output 0–10 V – Text display for menu, status Temperature sensor for duct for control of e.g. frequency and fault indications I Note installation inverter, shutter, EC motor. Range 0 to +40 °C Electronic speed controllers may – 2 x potential-free relay, program- produce motor humming. mable, alarm, heating or status Type LTR 40 Ref. no. 1323 Transformer controllers are to be signals Room temperature sensor used for noise critical applications. Range 0.5 to +40 °C

538 Electronic control system EUR EC 0–10 V, control variables: Temperature, pressure, air velocity

EUR EC

I Universal control system EUR EC Electronic control unit with 0–10 V DC control output. I Note I Area of application Depending on the fan type to For stepless control or regulation be connected, multiple fans of single and three phase EC can be connected in para llel fans with a setpoint input of to an EUR EC. 0–10 V DC. Inputs and outputs: Mode 2.03: Temperature control with additional function I Control functions Outputs: Mode 2.05: Differential temperature control Simple and quick start-up of pa- – 2 x analogue outputs 0–10 V to rameters via integrated “startup control e.g. EC motor, frequency wizard”. Depending on the con- inverter, shutter nected sensor a control can be – 2 x potential-free relay, pro- or EC fan carried out according to follow- grammable, alarm, heating or ing control variables: status signals – Manual speed control, e.g. Inputs: adjustable via keyboard – 2 x sensor inputs, programma- – Temperature (required accesso- ble on the respective necessary E.g. ry temperature sensor LTR 40 sensor type or LTK 40) – 3 x digital inputs, programmable – Temperature with additional ro release, external interference, Mode 4.01: Differential pressure control functions pre-programmed, limit on/off, switching night Mode 6.01: Air velocity control (required accessory temperature reduction, internal/external, sensor LTR 40 or LTK 40) control/manual operation, – Differential temperature con- reset, max. speed on/off trol (required accessory temper- or EC fan ature sensor LTR 40 or LTK 40) Possible settings – Differential pressure (required – Stepless selection of setpoints accessory differential air pres- and control range sure sensor LDF 500) – Min./max. power (speed) limit – Differential pressure with out- – On/off switching of minimum E.g. side air temperature compen- air flow volume sation (required accessory diff- – Switching e.g. heating via pro- ferential air pressure and tem- grammable relay perature sensor LDF 500 and – Stepless selection for alarm Type EUR EC Ref. no. 1347 I Necessary accessories LTR 40 or LTK 40). Ideal for cen- indication at low and high tem- Voltage 230 V~, 50/60 Hz tral ventilation systems accord- perature, output on display or Control output 0–10 V / max. 10 mA Type LDF 500 Ref. no. 1322 ing to DIN 18017 in residential additionally on relay Controlled output voltage 0 – 100 % Differential air pressure sensor construction. – Min. and max. shutter opening Control range temperature 0 – 40 °C Range 0 – 500 Pa – Air velocity (required accessory – Reverse control functions Control range pressure 0 – 500 Pa air velocity sensor LGF 10) – Continuous control of ventilation Control range velocity 0 – 10 m/s Type LGF 10 Ref. no. 1325 dampers Permitted ambient temp. 0 to +40 °C Air velocity sensor The required sensor is to be or- – Adjustments made via a dirt- Protection class IP 54 Range 0 – 10 m/s dered separately as an accessory. resistant membrane keypad. Casing surface mounted installation, The control ranges are freely ad- polymer, light grey Type LTA 40 Ref. no. 1336 justable within the sensor’s range. I Display Dim. mm W 223 x H 200 x D 131 Temperature sensor for outside – Multi-function LC display Weight approx. 1.0 kg Range –20 to +60 °C The aligned output voltage accord- – Numerical setpoint and actual Wiring diagram no. SS-1001 Protection class IP 54 ing to nominal value and current value display with scale value is between 0 % (0 V DC) to – Symbols (alarm, heating, Type LTK 40 Ref. no. 1324 100 % (10 V DC). The specification release) Temperature sensor for duct of minimum and maximum values – Bar graph/level indicator installation is possible. – Text display for menu, status Range 0 to +40 °C and fault indications Type LTR 40 Ref. no. 1323 Room temperature sensor Range 0.5 to +40 °C

539 Measure Control · Regulate Electronic controllers, 0–10 V DC control output Control variables: Differential pressure, temperature

EDR ETR

I Electronic controller for I Differential pressure controller I Temperature controller ETR I Note differential pressure or EDR The controller is freely adjustable Depending on the fan type to be temperature With firmly integrated pressure within the sensor measuring connected, multiple fans can be sensor and connections for ranges, with the optional func- connected in para llel to an EDR I Area of application pressure hoses (DN 5 mm, tions of cooling or heating, with or ETR. For stepless control of 1 ph. and on-site). adjustable minimum air shut-off. 3 ph. EC fans or frequency in- I Adjustable pressure ranges: I Temperature control range verters with a setpoint input of 0-1000 Pa, 0-500 Pa, 0-300 Pa, –50 to +150 °C. 0-10 V DC. If the EC fan or fre- 0-200 Pa I Appropriate sensors (types LTA, quency inverter provides a sup- LTK, LTR, see accessories) are ply voltage of 10-24 V DC/6 mA available for temperature meas- (safety extra-low voltage), the urement. controller can be directly pow- ered or alternatively via a power Type EDR Ref. no. 1437 Type ETR Ref. no. 1438 I Necessary accessories for supply unit (NG 24, acces- Supply voltage 10-24 V DC, 6 mA Supply voltage 10-24 V DC, 6 mA EDR and ETR sories). Analogue outputs 0-10 V DC Analogue outputs 0-10 V DC Type NG 24 Ref. no. 1439 10 V / 0.3 mA 10 V / 0.3 mA Power supply unit for DIN rail I Display 24 V / 10 mA 24 V / 10 mA mounting, input 100-240 V AC, – Multi-function LCD display Signal input 10-24 V DC / 6 mA Signal input 10-24 V DC / 6 mA output 24 V DC / 1.75 A. – Numerical setpoint and actual Switching setpoint 1/2 (day/night) Switching setpoint 1/2 (day/night) Required if fan type does not value display with measurement Permitted humidity 85 % Permitted humidity 85 % supply 10-24 V DC / 6 mA. unit non-condensing non-condensing – Alarm, day/night mode Protection class IP 54 Protection class IP 54 Type WSUP Ref. no. 9990 – Text display for menu, status Protection category III Protection category III Week timer (safety extra-low voltage, (safety extra-low voltage, I Control functions galvanically isolated) galvanically isolated) Type WSUP-S Ref. no. 9577 Simple and quick start-up of pa- Permitted ambient temp. 0 to +50 °C Permitted ambient temp. 0 to +50 °C Week timer for DIN rail mounting rameters using LCD display and Casing Surface installation, Casing Surface installation, three internal input keys. Perma- Polymer, light grey Polymer, light grey I Necessary accessories for nent measurement display on Dim. mm W 114 x H 108 x D 56 Dim. mm W 114 x H 108 x D 56 ETR LCD display. Weight 250 g Weight 200 g Type LTA 40 Ref. no. 1336 Optional parameterisation as Wiring diagram no. SS-1039 Wiring diagram no. SS-1040 Temperature sensor for outside – regulator = 0-10 V analogue Measuring range –20 to +60 °C output proportional to the meas- Protection class IP 54 ured actual value as control vari- able for external controls or as Type LTK 40 Ref. no. 1324 – controller = controlled 0-10 V Temperature sensor for in-duct analogue output in relation to installation the set setpoint value and the Measuring range 0 to +40 °C measured actual value. The controlled output voltage Type LTR 40 Ref. no. 1323 between the actual and setpoint Room temperature sensor value lies between 0 % (0 V DC) Measuring range 0.5 to +40 °C and 100 % (10 V DC). The specification of min. and max. values is possible, two setpoint values (e.g. for day/night mode) are also adjustable. Switching by means of week timer (types WSUP, WSUP-S, see acces- sories).

540 Speed-potentiometer Three-step switch

PU / PA SU / SA

Basic circuit diagram Basic circuit diagram

Stepless EC fan speed setting with potentiometer EC fan Release*

Operating status / 3-step Error display* speed setting *Depending on fan type

I Speed-potentiometer PU / PA I LED light ring I Three-step switch SU / SA I Delivery range with additional functions The colour of the light ring 10 V / 0-10 V I Flush mounting switch and LED signals the operating status of Type SU-3 10 Ref. no. 4266 the fan. For fans with operating I Area of application Installation in deep flush box (D 65 mm) I Area of application signal relay, change from green Three-step switch for flush or Dim. mm W 80 x H 80 x D 15 overhang For direct control/setpoint speci- (normal operation) to red (fault). surface mounting. fication of EC fans with poten- See technical data for necessary For three-step control of EC I Surface mounting tiometer input. supply voltage. fans or frequency inverters, Type SA-3 10 Ref. no. 4267 Additionally equipped with a re- with a 0-10 V DC control input. Protection class IP 40 lease switch and LED display for I Delivery range Casing Surface installation, the operating status (depending I LED power supply 10 V I Functions polymer, white on the fan type features). Type PU 10 Ref. no. 1734 Three different setpoints can be Dim. mm W 80 x H 80 x D 60 Installation standard flush mounted box specified/issued using SU/SA. I Control with potentiometer Dim. mm W 80 x H 80 x D 21 overhang Each step is freely adjustable via I Technical data The potentiometer is attached a separate potentiometer from for all SU / SA types directly to the potentiometer in- Type PA 10 Ref. no. 1735 0 to 10 V DC. Supply input: 10 VDC Ri = 12.5 kOhm put of the fan control. This has Casing Surface installation, A week timer (WSUP, WSUP-S, (safety extra-low voltage) a potentiometer supply of e.g. Polymer, light grey accessories) can also be con- Own consumption: 1.5 mA 10 V DC and an input control Dim. mm W 80 x H 80 x D 65 nected to switch from 3-step Control output: 0 to 10 V DC optional signal of 0-10 V DC. day mode to e.g. night mode. via switch or external switchover I LED power supply 24 V The night/reduction mode is Proteciton class IP 30 when installed I Minimum voltage Type PU 24 Ref. no. 1736 freely adjustable using another Protection category III A second potentiometer is firmly Installation, dimensions see PU 10 potentiometer from 0 to 10 V DC. Wiring diagram no. SS-1022 integrated in the PU/PA. The minimum voltage (min. 1.3 V) Type PA 24 Ref. no. 1737 is steplessly adjustable, thus Casing, dimensions see PA 10 a reliable motor start-up is guar- anteed on the lowest speed set- I Technical data for all types I Note ting. Potentiometer 10 kOhm (min. potentiometer approx. 7.9-16.5 kOhm) Depending on the fan type to be I Release switch A Potentiometer supply of 10 V results in a connected, multiple fans can be The rotary knob for the poten- control voltage 0-10 V DC. connected in para llel to a speed- tiometer is also a pressure Min. voltage 1.3-6.7 V DC adjustable. potentiometer or three-step switch, which can be used to LED supply voltage: switch. switch the fan with release input 10/24 V DC (P 10/24), min. 6 mA (e.g. 24 V DC) on/off. Permitted ambient temp. 0 bis +40 °C Proteciton class IP 40 Wiring diagram no. SS-1000

541 Measure Control · Regulate Temperature and humidity controller Differential pressure switch

Differential pressure switch DDS I Technical data Type DDS Ref. no. 0445 Adjustable pressure range 50 – 500 Pa Switching difference Dp 20 Pa I Area of application max. operating overpressure 5 kPa I Complete kit to monitor air filter, Current 230 V AC 1.5 (0.4) A system pressure and fan opera- 24 V DC 0.1 A tion. Ambient temp. -20 to +85 °C I Suitable for DDC applications Air flow temp. -20 to +85 °C (24 V DC/0.1 A) due to gold- Humidity 0...50% RH, plated connection contacts. non-condensing Once the unit has been con- Protection class IP 54 nected conventionally (230 V Dim. mm Ø 104, D 58 AC /1.5 A), subsequent use in Weight approx. 0.23 kg DDC applications is no longer Wiring diagram no. SS-490 I Function I Delivery possible. Adjustable opener/closer to Complete kit including: I Suitable for applications monitor pressure loss and thus – Differential pressure switch DDS according to VDI 6022. the amount of dust in air filters, – 4 fastening screws the pressure increase of fans – 2 pipe connections and the pressure level within – Connection pipe the ventilation system. Ø 6 mm x 1.5 mm x 2000 mm – Drilling template for connecting points – Retaining plate + 3 fastening screws – 3 screw terminals

One-step thermostat TME 1 I Technical data Type TME 1 Ref. no. 1334 Voltage 230 V~, 50/60 Hz Current 16 A I Area of application Max. current (AC 3) 6 A I Robust, electronic thermostat for Temperature range 0 to +50 °C temperature-dependent on/off Switching sensitivity +/- 0.8 K at 20 °C operation of fans or heaters. Protection category II Suitable for installation in humid Protection class IP 54 and dusty rooms. Surface Ambient temp. 0 to +60 °C mounting in any position. Dim. mm W 82 x H 80 x D 75 Weight approx. 0.2 kg Wiring diagram no. SS-701 Connection cable NYM-O 4 x 1.5 mm2 I Function I Specification I Single step control thermostat I Enclosed casing made of impact for direct switching of one or a resistant, light grey polymer. number of fans. Cable entry on the bottom of I Also suitable for heater control casing via self-sealing grommet through optional connection. PG 11. I Potential-free switch-over I Connection via terminal block, contact. after removing the casing cover.

Ventilation hygrostat I Technical data HY 3 HY 3 SI Type HY 3 Ref. no. 1359 Relative humidity level 30 to 90 % Switching sensitivity approx. ± 6 % Ventilation hygrostat Voltage max. 230 V~, 50/60 Hz Type HY 3 SI Ref. no. 1360 Current 3 A (ind.) Internal scale. Ambient temperature 0 – 40 °C Protection class IP 20 I Area of application Dim. mm W 76 x H 76 x D 34 I Electromechanical humidity Weight approx. 0.25 kg controller for on/off operation of Wiring diagram no. SS-168.1 fans (in 3 ph. models control via contactor) to reduce the relative humidity in a room through air exchange. I Specification I Not suitable for dusty or I Universal hygrostat housed in an aggressive air. attractive polymer casing for I Sensor element made of surface mounting. Colour white. polyamide fibres. I Setpoint adjustment via external I Also suitable for humidification rotary knob. In HY 3 SI via the through optional connection. inner scale.

542 Air quality and differential temperature controller Flow monitors

Air quality controller I Function I Technical data Type ACL Ref. no. 0492 I On and off operation of one or a Voltage 230 V, 1~, 50/60 Hz number of fans in relation to the Overrun time, adjustable 1 – 10 min. I Area of application room’s air quality. Power-up delay approx. 5 sec. I Electronic air quality controller I The unit has an integrated sen- Current 2 A (ind.) to control: sor which reacts on oxidable Protection class IP 30 – 1 ph. fans gases and pollutants such as Dim. mm W 125 x H 75 x D 30 up to max. 1 A. carbon mo noxide, alcohol, Weight approx. 0.2 kg – 3 ph. fans formaldehydes, benzene, sol- Wiring diagram no. SS-485.1 via contactor. vents, methane, tobacco etc. I For ventilation systems in con- ference rooms, restaurants, I Possible settings I Casing shops, manufacturing plants, I The unit switches the fan on if Compact casing with air exchange living/meeting rooms. the set value is exceeded or if slots, made of light grey polymer, the concentration rises quickly. for surface installation. I Adjustable (from outside) over- run timer after the sensor has switched off. I Indicator lamp for operation type (automatic/manual) and fan operation and overrun time. I Functional and operational switch on the front casing

Electronic air flow monitor value is reached or exceeded. max. 10 m extendible), that is to Type SWE Ref. no. 0065 Two LED’s show UN and the be connected to the control unit. I Area of application position of the output relay. It is To monitor air flow in ducting. possible to connect an external I Technical data Open or closed circuit principles failure display via a relay output Voltage 230 V, 1~, 50/60 Hz are available as options. (1 change-over, voltage free, Current 5 A (ind.) cos j 0.4 I Function max. current 5 A / AC 250 V). Setpoint adjustment range 1-20 m/s The air flow sensor (connected I Installation Air flow temperature max. 60 °C to controller) registers the air Control unit suitable for mount- Ambient temperature max. 60 °C flow and compares it with the ing in switch cabinet for fixing on Protection class IP 20 preset value. That can be set on a 35 mm support rail. Dim. mm W 35 x H 90 x D 66 the front side of the control unit Air flow sensor with mounting Sensor length mm 140 (in the range of 1 – 20 m/s). rosette for in-duct installation Weight approx. 0.4 kg The relay contacts if the set with cable (length 2.5 m; up to Wiring diagram no. SS-689.1

Mechanical air flow monitor I Function I Technical data Type SWT Ref. no. 0080 I Can be used as a switch to make Voltage 24-230 V AC, 50/60 Hz I Area of application or break circuit connections. Current 15 (8) A (ind.) I Mechanical air flow monitor with I The unit can be set to respond if Air temperature limits -40...+ 85 °C adjustable trigger power to a minimum or maximum air flow Protection class IP 65 monitor the minimum air flow velocity is achieved. Dim. mm velocity in ducting minimum I Adjustable minimum air flow – Paddle W 55, L 200, D 0.15 diameter 315. velocity: – Casing W 140 x H 65 x D 62 I Design – Lower than approx. 1.5 m/sec. Weight approx. 0.4 kg Robust design with a paddle – Higher than approx. 3 m/sec. Wiring diagram no. SS-557.1 made of high-grade steel and I Installation supplied with mounting plate to Unit must be installed in a way fix the unit outside of the duct- that the weight of the paddle ing. does not affect the spring mechanism inside the unit.

Differential temp. controller I Function I Technical data Type EDTW Ref. no. 1613 I Stepless speed control between Voltage 230 V, 1~, 50/60 Hz I Area of application and (0 – 100%) in relation to the Current max. 2.5 A (T 40 E) advantages temperature difference between Adjustable control range 1 – 10 K I Electronic, stepless differential both temperature sensors and Protection class IP 20 temperature controller for the equalisation with the set- Dim. mm W 210 x H 85 x D 55 connection of electronically point specification. Weight approx. 0.7 kg controlled I Includes tempera ture sensors Wiring diagram no. SS-438 – Ceiling fans and all with a flying lead (1 x 10 m long, – 1 ph. fans. for mounting below the ceiling; I Possible settings I For continuous speed control 1 x 2 m long, for mounting I On/off (with function display) in relation to the temperature above the floor. I Automatic/manual operation. difference. I If the temperature difference I Reverse of air flow direction. I Designed for use in combination rises the fan speed increases I Proportional range. I Casing with ceiling fans or fans which proportionally and slows down I Summer operation: Impact-resistant white polymer, move the room air towards the for decreasing temperatures. as manual speed controller. for surface and flush mounting. floor to save heating energy. I Proportional range can be Depending on the fan type, The unit optimises the difference adjusted steplessly from 1–10 K. motor humming might be between the floor and ceiling produced. temperature.

543 Measure Control · Regulate