Halstead Ace High Installation And Servicing Instructions

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Halstead Ace High Installation And Servicing Instructions Manual pdf 31 page image

37 WATER HOUSING GROUP SET9.11 THERMISTORS - DHW OR HEATINGThe thermistors are immersed in the waterways hence slight waterloss is likely during this operation. Provision should be made tocollect a small amount of water underneath the appliance.a) Remove the casing front panel and lower the controls fasciapanel as described in section 9.6 step (a).b) Isolate the appliance from the system as follows:If replacing DHW thermistor turn off the inlet water valve (seesection 5) and open all DHW taps to empty the DHW circuit).If replacing CH thermistor, turn off the boiler flow and returnfrom the system using the isolation valves as shown in section 5.c) Unclip and remove the electrical connector plug from thethermistor. Unscrew the thermistor from the waterway.d) Replace the thermistor and re-assemble in reverse order. Ensurethe copper washers are correctly fitted to provide a sealedjoint. Re-commission the system as described in section 5.PLATE HEATEXCHANGERSOCKET HEADCAPSCREWS (2)(Secure plateheat exchanger)DHWFLOWSWITCH(Pink Wires)LARGE BRASS NUT(Water flowregulator behind)DHW PRESSURESENSING PIPESPRESSURE RELIEFVALVEBYPASS(Underneath)FLOW SWITCHSECURINGSCREWS (2)PRIMARY/FLOWSWITCH(Violet Wires)LARGEHEXAGONNUT‘O’ RING SEALFILTERWATER FLOW REGULATOR(Small diameter towards smallhexagonal nut)SMALLHEXAGONALNUTPUMPDHWTHERMISTOR(Black Wires)CHTHERMISTOR(Grey Wires)9.10 CH/DHW MICROSWITCHa) Remove the casing front panel and lower the controls fasciapanel as described in section 9.6 step (a).b) Release the appropriate micro switch assembly from the spindleby sliding out the retaining spring clip (Refer to figure 37).c) Unscrew the three screws fixing the plastic housing halvestogether and slide the micro switch forwards to release it fromthe housing.d) Transfer the electrical connections to the new micro switch, fit thenew micro switch and re-assemble in reverse order.9.9.1a) On completion of replacing the PCB the CH maximum heatinput will require setting.b) Connect a suitable manometer to the gas inlet and burnerpressure test points (see Fig. 35).c) Set the clock to the ON position (I) and ensure any externalcontrols are calling for heat.d) Set the Main Switch to the Heating & Water position and turnthe temperature control knobs to high.e) Wait until appliance has lit (in CH mode only) and turnpotentiometer P3 (max CH set point) to the required burnerpressure between 9.7 and 1.3 mbar (originally factory set at6.3mb)PCB CH HEAT INPUT SETTINGPROCEDURE2936 OVERHEAT THERMOSTATPHIALPIPE CLIPELECTRICALCONNECTIONSSECURING NUT &OVERHEAT RESET BUTTONc) Remove carefully the control knob clips holding the controlknob in position and pull out the three control knobs from thefront of the fascia panel (Fig. 30).d) Unclip the electrical connector plugs from the PCB (refer tosection 7).e) Remove the six self taping screws securing the PCBf) Remove the PCB. Re-assembly is in reverse order