Ideal Boilers mini HE C24 Installation And Servicing

SERVICINGmini HE --- Installation & Servicing3853 AIR PRESSURE SWITCHREPLACEMENTTwo different types of air pressure switch may be used in theboiler. Refer tho the following drawings in accordance with thetype of air pressure switch used.1 Disconnect the electrical supply.2 Remove outer and inner casing as explained in frame 34.3 Disconnect the pressure sensing pipe from the airpressure switch.4 Disconnect the electrical harness from the air pressureswitch.5 Undo the two screws which hold the air pressure switch tothe chassis and remove it.6 Replace the switch.7 Re---assemble in reverse order.To correctly connect the venturi device to the air pressureswitch, refer to the illustration of frame 51 and to thefollowing illustrations in accordance with the type ofpressure switch used.N.O.N.C.”L” connectionCOM”H” connection(not used)”L” connection”H” connection(not used)54 PUMP REPLACEMENT COMPLETE1 Disconnect the electrical supply.2 Remove the front and right hand side casing panels (referto frame 34).3 Release system pressure by opening the main circuitdrainage cock.Do not release CH pressure using the pressure reliefvalve. It may cause debris within the system to foulthe valve.4 Disconnect the connector A.5 Loosen the connector B.6 Remove the fork C and the pipe D.C DAB7 Remove the fork E and the connection of the capillarypipe of the pressure gauge.8 Remove the locking plate F.9 Completely loosen the connection G.10 Unscrew the two screws H that hold the pump on theframe11 Remove the pump towards the front of the boilerEIGFHRe---assemble in reverse order.When reassembling the pump, check the correct location ofthe O ---ring gasket in the inlet port of the pump that seals theconnection between the pump and the brass group .If the motor only needs replacing, disconnect the connectorA, unscrew the 4 screws I and remove the pump motorforwards.SERVICING