R8845U Universal Switching Relay

INSTALLATION INSTRUCTIONS APPLICATION Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line voltage contacts; The R8845U Universal Switching Relay provides inter- maximum connected load is 2000 VA. mediate switching of line- and low-voltage devices from a line- or low-voltage controller. The R8845U may be used to Switching Action: replace several Honeywell or competitive switching relays 2 Spst, plus Powerpile¨ rated low-voltage Spst. If normally and is typically applied in hydronic heating systems. closed contacts are needed, use RA889A Switching Relay.

Electrical Connections: SPECIFICATIONS No. 8 captivated wire clamp screw terminals.

Electrical Ratings: Dimensions: Voltage: 120 Vac, 60 Hz. See Fig. 1. Thermostat Heat Anticipator Setting: 0.12A. Cross Reference: Transformer Ratings: The R8845U replaces Honeywell models R182A,B,C,J; Primary: 120V, 60 Hz. R482A,B,C,J; R845A, R882A,B,C,J and RA832A, as well Secondary: 24 Vac, 12 VA maximum; 9 VA available for as several competitive models. See Table 1 for additional external loads. Output protected by replaceable 1A cross reference information. automotive fuse. Replacement Parts: 32002190-001 Replacement Relay. Replacement Fuse: Use a 1A automotive fuse.

Table 1. R8845U Replacement Cross Reference. Connections Manu- Input Line Power Relay Power Low Volt- facturer Model Voltage 1 Relay 2 age Relay Thermostat Comments Honeywell R8845U L1 L2 COM N.O. A B X1 X2 W(T) R(T) C — Honeywell R845A 1 2 3 4 5 6 — — T T — — Honeywell RA832A12— 3—4XXTT—Jumper L1 to COM and A in R8845U. Honeywell R182A 1 2 7 8 ————See Fig. 8 R8845U has lower output thermostat load rating. Check load connections. requirements. Use RA889A if normally closed contacts are Honeywell R182B 1 3 6 8 ———— required. Honeywell R182C 1 2 6 8 3 5 — — Honeywell R182J L1 L2 — 4 — 7 — — If used to replace an R182J, install a jumper between L1, COM and A. Honeywell R482A 1 2 7 8 ————Jumper R(T) Line voltage switched to W(T). inputs go to L1 and L2. See Fig. 9B. (continued)

Table 1. R8845U Replacement Cross Reference (Continued).

Connections Manu- Input Line Power Relay Power Low Volt- facturer Model Voltage 1 Relay 2 age Relay Thermostat Comments Honeywell R482B 1 2 6 8 ————Jumper R(T) Use RA889A if normally to W(T) closed contacts are (continued). required. Line voltage switched inputs go to Honeywell R482C 1 2 6 8 3 5 — — L1 and L2. See Fig. 9B. Honeywell R482J 1 2 6 8 3 4 — — Honeywell R882A — — 7 8 ———— W — BR8845U has lower output load rating. Check load requirements. Honeywell R882B — — 6 8 ———— W — BUse RA889A if normally closed contacts are Honeywell R882C — — 6 8 3 5 — — W — B required. Honeywell R882J — — 6 8 3 4 — — 1 — 2 Argo AR821 1 2 3 4 5 6 — — T T — R8845U has lower output load rating. Check load requirements. Argo AR822 L1 L2 3 4 N.O. 5 6 ——G(T) R(T) C Use RA889A if normally N.O. closed contacts are Erie SR100AT L1 N 3 4 N.O. 5 6 ——G(T) R(T) C required. N.O. White- 829-189 1 2 3 4 ———— B R WR8845U has lower output Rodgers load rating. Check White- 829-832 1 2 — 4 — 3 X1 X2 T T — load requirements. Rodgers Taco SR501 H N 3 4 N.O. 5 6 ——W(T) R(T) C Use RA889A if normally N.O. closed contacts are required.

69-1292 2 R8845U UNIVERSAL SWITCHING RELAY

1 4 (108) 5 4 1 (29) MOUNTING 32 In replacement applications, mount the new relay in the 7 same location as the old relay. For new installations, 1 8 locate the relay vertically on a solid wall or partition as (48) close as possible to the device to be controlled. Select a location that is easily accessible for installation and service.

7 (22) DIAMETER NOTE: To reduce the possible transformer hum and 3 8 (2) DIAMETER 32 relay noise that is sometimes amplified by 1 KEYHOLE TYPE (13) DIAMETER MOUNTING HOLE mounting surfaces such as sheetmetal, plaster- 2 board, and similar materials, place rubber or felt washers between the case and the mounting surface.

1 4 2 1. Position the relay and mark the mounting holes. See (114) Fig. 1. 2. Start a screw in the upper right corner for the keyhole type mounting hole. Screw it down within 1 5 4 about 1/8 in. (3 mm) of the surface. (133) 3. Hang the relay on the screw, position the case, and start the bottom screw. 4. Tighten both screws.

1 3 3 (89) (10) 2 8 3 WIRING 7 (10) (6) DIAMETER MOUNTING HOLE 8 32 CAUTION 15 2 Electrical Shock or Personal Injury Hazard. 16 (75) Power supply can shock. Use only NEC Class 1 wire for all line voltage 7 1 8 wiring connections. Class 1 wires must be rated for (48) at least 167°F (75°C).

All wiring must comply with all applicable electrical codes, 25 3 KNOCKOUT FOR (20) 1 (35) ordinances, and regulations. Follow all instructions 32 8 1/2 (13) CONDUIT (3) M3823A furnished with the controlled equipment.

Fig. 1. R8845U dimensions in in. (mm). IMPORTANT The switching relay terminals are approved only for use with copper wires.

INSTALLATION When two or more line-voltage load devices are to be controlled in parallel, the total current must not exceed the When Installing this Product . . . rating for the relay load outputs. Never connect load 1. Read these instructions carefully. Failure to follow terminals to a load that uses more current than the amount them could damage the product or cause a hazard- listed in the electrical ratings on the relay. See Table 2 for ous condition. maximum low-voltage wiring length specifications. See the 2. Check the ratings given in the instructions and on schematic and typical hookups in Fig. 2 through 9. the product to make sure the product is suitable for your application. Table 2. Low-Voltage Maximum Wire Lengths. 3. Installer must be a trained, experienced service technician. Total Wire Wire Length of Run 4. After installation is complete, check out product Wire Length to Thermostat operation as provided in these instructions. Size 5. Follow local codes for installation and application. (AWG) Ft M Ft M 22 120 38.0 60 18.0 WARNING 20 200 61.0 100 30.5 Electrocution Hazard. Power supply can cause severe injury, 18 300 91.5 150 45.5 or death. 16 500 152.5 250 76.0 Transformer core not bonded. Disconnect power supply before wiring. 14 800 244.0 400 122.0

3 69-1292 R8845U UNIVERSAL SWITCHING RELAY

LOW VOLTAGE (CLASS 2) HYDRONIC HEATING TO ADDITIONAL R8845U 2-WIRE THERMOSTAT CONTROL TERMINALS RELAYS FOR OTHER ZONES

CALL FOR HEAT LED AUTOMOTIVE T R8845U RELAY FUSE THERM. THERMOSTAT L R(T) C ZONE 1 2 T R(T) W(T) THERMOSTAT L1 W(T) ZONE 2 ZC

A RELAY ZP LED B B1 N.O. G L2 L1 COM N.O. A B X1 X2 BURNER BURNER CONTROL B2 COM

1 1 1 LOW-VOLTAGE CIRC. CIRCULATOR ZONE 1 CIRCULATOR POWERPILE¨ ZONE 2 L1 TO TO C2 L2 HOT POWER LOAD 1 POWER LOAD 2 1 L1 2 HOT 1 POWER SUPPLY. PROVIDE OVERLOAD PROTECTION LINE 1 AND DISCONNECT MEANS AS REQUIRED. M14294 3 2 L2 Fig. 2. R8845U Internal schematic and typical hookup. 1 POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED.

2 IF CONTROLLING TWO LOADS, USE: N.O. AND COM FOR LINE VOLTAGE LOAD, A AND B FOR LINE OR LOW VOLTAGE LOAD.

3 IF USING LOW VOLTAGE, USE A SEPARATE TRANSFORMER. M14296

Fig. 3. R8845U schematic diagram for multizone, hydronic heating system (applies for any number of additional zones).

T87F L7124A, L8124A T87F T87F R8845U RELAY R8845U RELAY R(T) W(T) ZC

ZR R(T) W(T) R(T) W(T) 2 3 G L2 L1 C1 C2 B2 B1 L1 L2 COM A B N.O. L1 L2 COM A B N.O.

L2 L1 (HOT)

PUMP PUMP PUMP

R8184

T F C554 T F

BURNER BLACK ORANGE AND

WHITE IGNITION

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

3 B1 IS 1/4 IN. TAB TERMINAL. M14298

Fig. 4. R8845U hookup for L7124A/L8124A in an oil-fired, tankless hot water, zoned, pump system.

69-1292 4 R8845U UNIVERSAL SWITCHING RELAY

T87F T87F T87F

R8845U R8845U R8845U RELAY R(T) W(T) R(T) W(T) R(T) W(T)

L1 L2 COM N.O. X1 X2 L1 L2 COM N.O. X1 X2 L1 L2 COM N.O. X1 X2

L1 PUMP PUMP PUMP (HOT) 1 L2

ORANGE GL2L1 T T F 2 WHITE 3 C554 F C1 C2 B2 B1 BLACK BURNER T AND L7148A/L8148A IGNITION T R8184G

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

M14300 3 B1 IS 1/4 IN. TAB TERMINAL.

Fig. 5. R8845U hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system.

T87F T87F T87F

R8845U RELAY R8845U R8845U

R(T) W(T) R(T) W(T) R(T) W(T)

L1 L2 COM N.O. X1 X2 L1 L2 COM N.O. X1 X2 L1 L2 COM N.O. X1 X2

L1 PUMP PUMP PUMP (HOT) 1 L2

GL2L1 T T 2 TR LOW VOLTAGE 3 GAS VALVE THTR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND (eg, VR8300) OVERLOAD PROTECTION AS REQUIRED. C1 C2 B2 B1 TH 2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. L7148F/L8148E USE GROUNDING SCREW PROVIDED.

3 B1 IS 1/4 IN. TAB TERMINAL. M13318

Fig. 6. R8845U hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.

5 69-1292 R8845U UNIVERSAL SWITCHING RELAY

L1 R8888 L2 (HOT) 3 1

R C G 2 1L1 ZC L2 L1 R8845U

L2 L2 L1 CIRCULATOR

A B C PUMP 5 L1

4 20 VA N.O. H1 H2 ZC TO APPROPRIATE A H1 CONNECTIONS AS REQUIRED BY THE SYSTEM. H2 B H1-H2 TYPICALLY ZONE 1 THERMOSTAT CIRCULATOR CONNECTED TO COM T-T OF BURNER C2 C1 R W PUMP 1 ZONE 5 CONTROL SYSTEM. ZONE 1 THERMOSTAT ZONE 2 R(T) THERMOSTAT CIRCULATOR C2 C1

R W R W R W R W R R W PUMP 2 W(T) ZONE 2 G ZONE 3 THERMOSTAT CIRCULATOR

C2 C1 PUMP 3

ZONE 3 1

ZONE 4 THERMOSTAT CIRCULATOR

C2 C1 PUMP 4 ZONE 4

1 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD USE GROUNDING SCREW PROVIDED. PROTECTION AS REQUIRED. 2 USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1 4 CONNECT L1-ZC JUMPER, IF REQUIRED. CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C). M13315

Fig. 7. R8888 Zone expansion using additional R8845U Universal Switching Relays.

THREE-WIRE TWO-WIRE LOW VOLTAGE LOW VOLTAGE (SERIES 10) 1 (SERIES 80) THERMOSTAT THERMOSTAT

W(T) R(T) B

R(T) C W(T) X1 X2 R(T) C W(T) X1 X2

R8845U R8845U

1 MAKES CONTACT ONLY ON TEMPERATURE FALL. M13319

Fig. 8. R8845U thermostat connections.

69-1292 6 R8845U UNIVERSAL SWITCHING RELAY

A. FOR 24V THERMOSTAT CONTROL CHECKOUT R8845U THERMOSTAT L1, (HOT) L1 R(T) R 1. Keep the cover on the relay during normal operation NEUTRAL L2 W(T) W and remove only for service and checkout. 2. Relay contacts require no cleaning; they are C C COM arranged to close with a wiping action and are self- LINE VOLTAGE OPTIONAL CONTROLLED cleaning. The contacts may turn black after being in N.O. 2 OUTPUTS service for some time; this discoloration does not A X1 prevent proper operation. LOW VOLTAGE POWERPILE¨ CONTROLLED OUTPUT 3. After installation is complete, operate system B X2 through at least one cycle from the controller to make certain the relay controls the equipment as B. FOR LINE VOLTAGE CONTROL intended.

LINE VOLTAGE R8845U CONTROL 3 L1 R(T) JUMPER NEUTRAL L2 W(T) TROUBLESHOOTING

C COM Test Button — This connection is the same as a call for heat connec- N.O. tion between the R(T) and W(T) terminals. A X1 Heat Call LED B X2 — The LED should light if there is a call for heat or if the test button is pressed. C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE — If the LED remains off during a call for heat and turns R8845U on when the Test Button is pressed, the thermostat is L1 R(T) not operating correctly. NEUTRAL — If the LED remains off on a call for heat and also L2 W(T) 24V CONTROLLER remains off when the Test Button is pressed, the 1 INPUT SUPPLY C R8845U is not operating correctly. Check the fuse; if COM the fuse is intact, replace the control.

N.O. Relay LED A X1 — This LED lights whenever there is 120 Vac (L1) on the B X2 N.O. terminal (when COM/N.O. relay contacts are closed).

1 REQUIRED FOR OUTPUT LED OPERATION.

2 FOR SERIES 10 OR OTHER HARDWIRED ELECTRONIC 3-WIRE THERMOSTATS.

3 WARNING! ELECTROCUTION HAZARD. POWER SUPPLY CAN CAUSE SEVERE INJURY OR DEATH. DISCONNECT POWER BEFORE WIRING OR SERVICING L1. POWERED RELAYS MUST BE WIRED AS DRY CONTACTS. M13320

Fig. 9. R8845U control options.

7 69-1292 R8845U UNIVERSAL SWITCHING RELAY

Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9

69-1292 J.S. 3-99 8 www.honeywell.com