Saunier Duval THEMA C 23, Installation And Servicing Instructions

Page 1: ...eating and hot water for the professionals THIS IS A CAT II2H3 APPLIANCE 01773 828100 I N W A R R A N T Y T E C H N I C A L H E L P L I N E 01773 828400 THEMA C 23 Installation and Servicing Instructi...

Page 2: ...English market The identification plate located on the inside of the appliance certifies the origin where the product was manufactured and the country for which it is intended If you see any exceptio...

Page 3: ...nd standards currently in force for this type of boiler Both the central heating and domestic hot water temperature are user adjustable from the boiler control panel see diagram1 Electrical components...

Page 4: ...Inlet pressure 20 mbar 28 mbar 37 mbar Gas rate maximum 2 71 m3 h 2 02 kg h 1 99 kg h Gas rate minimum 1 11 m3 h 0 83 kg h 0 82kg h Pump The performance of the pump varies according to the pump bypass...

Page 5: ...Pump 10 Automatic air vent 11 Burner 12 Heat exchanger bleed pipe 13 Heat exchanger 14 Gas valve Diagram 4 16 Overheat thermostat 17 Ignition electrode 18 Pilot 19 High limit thermostat 21 Loss of wa...

Page 6: ...s than 15 m o d pipe to discharge in a visible position outside the building facing downward preferably over a drain The pipe must have a con tinuous fall and be routed to a position so that any disch...

Page 7: ...or Sen tinel Contact the product manufacturers for specific details Filling the system Provision must be made for filling the system at low level The use of a WRC approved filling loop is strongly rec...

Page 8: ...er The boiler will work for heating without a room ther mostat and or timeswitch being connected pro vided that the wire link fitted between the two ter minals of connector E is left in place see diag...

Page 9: ...pressurise system as necessary Important If this procedure is not carried out properly the boiler will go into safety lock out until all of the air has been purged When venting air from boiler do not...

Page 10: ...sure test point below sealed combustion chamber see diagram 14 Connect a suitable pressure gauge Gain access to the rear of the control panel and locate the range rating adjuster screw see dia gram 13...

Page 11: ...ystem may indicate leaks in the system or corrosion taking place Call your Installer Service Provider Gas leak or fault If a gas leak or fault exists or is suspected turn the boiler off and consult th...

Page 12: ...olding both sides pull chamber forward to re lease it from underside of heat exchanger and out of boiler Take care not to damage insulation material on inside faces of combustion chamber Cleaning the...

Page 13: ...retaining clip from telescopic pump out let connection and slide connection upwards to release from pump Undo and remove two fixing screws and remove pump retaining bracket from front of pump Grasp p...

Page 14: ...fit expansion vessel pipe and loss of water switch to reversing valve assembly before pump to ensure that it is correctly located Apply silicone grease to all O rings and hoses prior to assembly Open...

Page 15: ...five screws and separate main components of water valve If white diaphragm cover is to be replaced sepa rate original from water valve end casting and fit replacement cover Fit replacement diaphragm m...

Page 16: ...between gas valve and burner supply pipe Refit push button box and thermocouple Refit electrical connections to replacement gas valve To replace modulating coil Ensure gas supply is off Disconnect two...

Page 17: ...place overheat thermostat Locate overheat thermostat on right hand side of heat exchanger REPLACEMENT OF PARTS Pull off electrical connections from thermostat Unscrew and remove two screws holding the...

Page 18: ...estic hot water works correctly but the heat ing doesn t refer to chart No 1 If heating works correctly but the hot water doesn t refer to chart No 3 IMPORTANT Always adopt a logical step by step pro...

Page 19: ...ostat operating correctly i e two stage operation of burner by rotating knob Replace boiler thermostat Replace main PCB NO NO YES YES YES YES NO NO YES NO FAULT FINDING Thermistor values Temperature o...

Page 20: ...mistor ok Refer to chart no 1 Check mains water supply water filter Replace diaphragm Replace DHW microswitch Replace DHW thermistor Replace PCB NO NO NO NO NO NO YES YES YES YES YES CHART 3 NO HOT WA...