gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions page 42

DHW SENSOR - REMOVAL
Identify the appropriate cable connections at the main PCB. Disconnect the
sensor cables. Cut any cable ties necessary to strip out the cable back to the
sensor head.
Unscrew sensor (counter clockwise) - replace if necessary. Re-assemble in reverse
order.
Replace cable ties.
UNDERTAKE WATER SOUNDNESS TEST.
Check boiler/controls operation.
STORE SENSOR - REMOVAL
Identify the appropriate cable connections at the main PCB. Disconnect the
sensor cables. Cut any cable ties necessary to strip out the cable back to the
sensor head.
Remove the R cup at the sensor pocket and pull out the sensor.
Replace if necessary and re-assemble in reverse order.
Replace cable ties.
Check boiler/controls operation.
PLATE HEAT EXCHANGER - REMOVAL
Isolate the boiler from the heating system.
Turn off the supply to any auto makeup tank if fitted. Open the safety valve to
release any internal pressure. Drain down the boiler.
Disconnect the union connectors (4) at the corners of the plate heat exchanger
and remove it.
When draining the plate heat exchanger take precautions against standby water in
the pipework and the heat exchanger.
Replace if necessary and re-assemble in reverse order.
NOTE:- Check the condition of the sealing washers at each connection and replace
if damaged.
UNDERTAKE WATER SOUNDNESS TEST.
Check boiler/controls operation.
ELECTRIC BOILER - REMOVAL
Isolate the boiler from the heating system.
Turn off the supply to any auto makeup tank if fitted. Open the safety valve to
release any pressure. Drain down the boiler.
Remove safety cover as described below.
Disconnect mains supply cables to the heater element and the control thermostat.
Disconnect the union connectors (2) at top and bottom of electric boiler and
remove it.
When removing the electric boiler take precautions against any standing water
in the pipework.
Replace if necessary and re-assemble in reverse order.
NOTE:- Check the condition of the sealing washers at both connections and
replace if damaged.
UNDERTAKE WATER SOUNDNESS TEST.
Replace any cable ties.
Check boiler/controls operation.
REMOVING ELECTRIC BOILER SAFETY COVER
Remove safety cover by undoing two screws at top and bottom.
Disconnect electric boiler overheat thermostat wires.
Remove the electric boiler overheat thermostat phial from the pocket by first
removing the securing pin.
The safety cover can now be moved away from the appliance.
Supplied By www.heating spares.co Tel. 0161 620 6677
COMPONENT EXCHANGE
ELECTRIC BOILER OVERHEAT
THERMOSTAT - REMOVAL
Remove electric boiler safety cover as described
above.
Disconnect the cables from the control
thermostat.
Re-assemble in reverse order.
ELECTRIC BOILER OVERHEAT
THERMOSTAT - REMOVAL
Remove electric boiler safety cover as described
above.
Remove thermostat from the safety cover and
replace if necessary.
Re-assemble in reverse order.
DHW AND CH PUMP - REMOVAL
Close the isolation valves on the pump to be
removed.
Remove the protective cover from the pump
terminal block and disconnect the supply
cable.
Loosen the isolation valve unions and remove
the pump - alternatively just change pump
head using allen key.
NOTE:- SOME RESIDUAL WATER FROM THE
PUMP HOUSING IS UNAVOIDABLE.
Replace if necessary and re-assemble in reverse
order.
NOTE:- Check the condition of the sealing
washers at both isolation valves and replace
if damaged.
UNDERTAKE WATER SOUNDESS TEST.
Check boiler/controls operation.
BOILER (HEAT EXCHANGER)
PUMP - REMOVAL
Isolate the boiler from the heating system.Turn
off the supply to any auto makeup tank if fitted.
Open the safety valve to release any residual
pressure. Drain down the boiler. Remove the
protective cover from the pump terminal block
and disconnect the supply cable. Remove the
pump motor from the impellor housing - four
allen key head screws.
Check the housing is clean and free from
debris.
Replace with a new motor if necessary and
re-assemble in reverse order.
NOTE:- Replace any damaged pump seals.
UNDERTAKE WATER SOUNDNESS TEST.
Check boiler controls and operation.
Page 42