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24/28/Bi24/28/Bi 24/28/bi24/28/bi Installation & Servicing Instructions THESE INSTRUCTIONS TO BE RETAINED BY USER Supplied By www.heating spares.co Tel. 0161 620 6677 Contents Design principles and operating sequence Page Servicing instructions Page 1.1 Principle components 2 6.1 General 13 1.2 Mode of operation 2 6.2 Routine annual servicing 13 1.3 Safety devices 2 6.3 Replacement of components 13 6.4 Component removal procedure 13 Technical data Page 2.1 Central heating 3 Checks, adjustments and fault finding page 2.2 Gas pressure 3 7.1 Checking appliance operation 14 2.3 Expansion vessel 3 7.2 Appliance mode of operation 14 2.4 Dimensions 3 7.2.1 Selector switch in the OFF position 14 2.5 Clearances 3 7.2.2 Selector switch in the ON position 14 2.6 Connections 3 7.2.3 Appliance functions 14 2.7 Electrical 3 7.2.4 Heating mode 14 2.8 Flue details 3 7.2.5 Heating parameters 15 2.9 Emissions 3 7.3 Checking & adjusting burner pressure 15 2.10 Pump duty 4 7.3.1 Setting the maximum burner pressure 15 7.3.2 Setting the minimum burner pressure 15 General requirements Page 7.4 Combustion analysis test 15 3A.1 Related documents 5 7.5 Checking the expansion vessel 16 3A.2 Location of appliance 5 7.6 External faults 16 3A.3 Gas supply 5 7.6.1 Installation faults 16 3A.4 Flue system 5 7.7 Electrical checks 16 3A.5 Air supply 5 7.7.1 Earth continuity test 16 3A.6 Water circulation 5 7.7.2 Short circuit check 16 3A.6.1 Pipework 5 7.7.3 Polarity check 16 3A.6.2 Automatic by-pass 5 7.7.4 Reversed polarity or supply fault 16 3A.6.3 Drain cocks 5 7.7.5 Resistance to earth check 17 3A.6.4 Air release points 5 7.8 Fault finding 17 3A.6.5 Expansion vessel 5 7.8.1 Replacing the main PCB 17 3A.6.6 Filling point 5 7.9 Fault codes 17 3A.6.7 Low pressure sealed system 6 3A.6.8 Frequent filling 6 Wiring diagrams Page 3A.7 Electrical supply 6 8.1 External wiring 18 3A.8 Mounting on a combustible surface 6 8.2 Typical control applications 18 3A.9 Timber framed building 6 8.3 Room thermostat 18 3A.10 Inhibitors 6 8.4 Other controls 18 3A.11 Declaration of conformity 6 Functional diagram 19 Installation Page Exploded diagrams Page 4.1 Delivery 7 Table 1-5 21-24 4.1.2 RAIN application 7 L.P.G. instructions Page 4.1.3 RAIN bi application 7 10.1 Technical data 25 4.2 Contents (appliance carton) 7 10.2 Converting the appliance gas supply 25 4.3.1 Unpacking 7 10.3 Gas supply installation 25 4.3.2 Preparation for mounting 10.4 Checking & adjusting burner pressure 25 the appliance (external application) 7 10.4.1 Setting the maximum burner pressure 25 4.3.3 Important 7 10.4.2 Setting the minimum burner pressure 25 4.4.1 External applications using the enclosure 7 4.4.2 External applications without the enclosure 8 4.5 Fitting the flue 8 4.5.1 Concentric horizontal flue 8 4.5.2 Concentric vertical flue 10 4.5.3 Vokera twin flue application 10 4.6 Connecting the gas and water 10 4.6.1 Gas 10 4.6.2 Flow and return 10 4.6.3 Safety valve 10 4.7 Electrical connections 10 4.8.1 Electrical connection 10 4.8.2 Connecting the mains (230V) input 10 4.7.1 Internal access 11 Commissioning Page 5.1 Gas supply installation 11 5.2 The heating system 11 5.3 Initial filling of the system 11 5.4 Initial flushing 11 5.5 Pre-operation checks 11 5.6 Initial lighting 11 5.7 Checking the burner pressure 11 5.8 Final flushing of the heating system 12 5.8.1 Inhibtors 12 5.9 Setting the boiler operating temperature 12 5.10 Setting the system design pressure 12 5.11 Regulating the central heating system 12 5.12 Final checks 12 5.13 Instructing the user 12 Supplied By www.heating spares.co Tel. 0161 620 6677 INTRODUCTION The Vokera Rain & Rain bi appliances are central heat- Fig.1/1A General Layout ing boilers, which - by design - incorporates electronic 1 Safety valve ignition, circulating pump, expansion vessel, safety valve, 2 Hydraulic manifold pressure gauge and automatic by-pass. 3 Pressure switch 4 Pump 5 Auto air vent (AAV) 6 Main heat exchanger 7 High limit thermostat 8 Primary NTC sensor 9 Differential pressure switch 10 Flue outlet 11 Flue gas analysis test point 12 Silicone pressure tube (-) 13 Fan assembly 14 Expansion vessel 15 Combustion chamber 16 Main burner 17 Electrode 18 Transformer 19 Gas valve 20 Pressure gauge 21 Electrical connection box 22 Main switch 23 Led for working mode 24 Central heating control Central heating Gas Return Flow Fig. 1 22 23 24 Fig. 1A They are produced as category II2H3+ appliances, suit- able for wall mounting applications only. They are pro- vided with a fan powered flue outlet with an annular co- axial combustion air intake that can be rotated - horizon- tally - through 360 degrees for various horizontal or vertical applications. The Rain & Rain bi appliances, can also be used with the Vokera twin flue system. These appliances are designed for use with a sealed system only; consequently they are not intended for use on open vented systems. The provision of stored hot water is possible by the addition of an indirect cylinder. Fig. 1B 24/28/bi 1 Supplied By www.heating spares.co Tel. 0161 620 6677 SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE 1.1 PRINCIPLE COMPONENTS When the appliance reaches the desired tem- ● A fully integrated electronic control board fea- perature the burner will shut down and the boiler turing electronic temperature control, anti-cy- will perform a three-minute anti-cycle (timer de- cle control, pump over-run, self-diagnostic fault lay). indicator, continuous gas modulation. When the request for heat and/or hot water has ● Low-water content copper heat exchanger. been satisfied the appliance pump and fan may ● Electronic ignition with flame supervision. continue to operate to dissipate any residual heat ● Integral pump. within the appliance. ● Fan. ● Expansion vessel. 1.3 SAFETY DEVICES ● Differential air pressure switch. When the appliance is in use, safe operation is ● Water pressure switch. ensured by: ● ● Two-stage gas valve. A water pressure switch that monitors system ● Pressure gauge. water pressure and will de-activate the pump, ● Safety valve. fan and burner should the system water pres- sure drop below the rated tolerance. 1.2 MODE OF OPERATION ● A high limit thermostat that over-rides the tem- When there is a request for heat and/or hot water perature control circuit to prevent or interrupt via the programmer/time clock and/or any exter- the operation of the burner. nal control, the pump and fan are started, the fan ● A differential air pressure switch that checks proves the differential air pressure switch which the operation of the fan and flue thereby allow- in-turn allows an ignition sequence to begin. ing safe operation of the burner. Ignition is sensed by the electronic circuitry to ● A safety valve which releases excess pressure ensure flame stability at the burner. Once suc- from the primary circuit. cessful ignition has been achieved, the electronic circuitry increases the gas rate to 75% for a period of 15 minutes. Thereafter, the boiler’s output will either be increase to maximum or modulate to suit the set requirement. fan flue outlet air intake primary main heat NTC sensor exchanger pressure switch expansion main vessel burner bottom AAV gas valve pump safety valve automatic by-pass pressure CH water drain tap switch CH CH Fig. 2 return flow 2 24/28/bi Supplied By www.heating spares.co Tel. 0161 620 6677 SECTION 2 TECHNICAL DATA 24-24 bi 28-28 bi 2.1 Central heating Heat input (kW) 26.3 30.5 Heat output (max) 24.0 27.6 Heat output (min) 9.4 10.5 Minimum working pressure 0.5 bar Maximum working pressure 3.0 bar Minimum flow rate 350 l/h 2.2 Gas pressures Inlet pressure G20 20.0 mbar Maximum burner pressure 10.1 mbar 11.3 mbar Minimum burner pressure 1.9 mbar 2.25 mbar Gas rate 2.78 m3/h 3.23 m3/h Injectors size 12 x 1.35 mm 13 x 1.35 mm 2.3 Expansion vessel Capacity 8 litres Maximum system volume 91 litres Pre-charge pressure 1.0 bar 2.4 Dimensions Height 810 mm (1223 box) 810 mm (1223 box) Width 450 mm (654 box) 450 mm (654 box) Depth 250 mm (257box) 250 mm (257box) Dry weight 35 kg - 31 kg 35 kg - 31 kg 2.5 Clearances Sides 12 mm Top 150 mm from casing or 25 mm above flue elbow, whichever is applicable Bottom 150 mm Front 600 mm 2.6 Connections Flow & return 22 mm (compression) Gas 15 mm (compression) Safety valve 15 mm copper 2.7 Electrical Voltage 230V/~ 50hz Power consumption 125 W Internal fuse 2 AL External fuse 3 A 2.8 Flue details (concentric) Maximum horizontal flue length (concentric) 1.0 m 1.0 m Maximum vertical flue length (concentric) 1.0 m 1.0 m Maximum twin flue length (horizontal ir vertical) 20m/20m + terminal 14,5m/14,5m + terminal 2.9 Emissions NOx (max-min) PPM 140 - 110 140 - 110 CO (max-min) PPM 100 - 130 80 - 150 CO2 (max-min) % 6.95 - 2.60 6.80 - 2.60 CO/CO2 ratio (max) 0.0014 to 1 0.0011 to 1 CO/CO2 ratio (min) 0.005 to 1 0.0057 to 1 Ref.
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