Component Exchange - gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions

IMPORTANT: Before commencing a service or changing a component, ISOLATE the
mains electrical supply TURN OFF the gas supply at the service cock.
To assist with a component identification and associated wiring refer to Figures
4, 5, 18, 19, 20, 31 and 32.
GAS VALVE - COMBUSTION FAN - BURNER - VENTURI
The components above form part of a sub-assembly,which must be removed before
one of them can be exchanged.
Remove the assembly by following the procedure detailed under 'Routine Annual
Servicing.'
GAS VALVE/VENTURI - REMOVAL
Remove these components as a common assembly - then split and replace as
necessary. Unscrew the two torq head screws fixing the assembly to the combustion
fan housing.
Pull off the assembly. Disconnect the valve from the Venturi by removing the
three torq head screws.
DO NOT MISPLACE THE SYNTHETIC RUBBER SEALING WASHER - BETWEEN THE
COMPONENTS.
The Venturi is a straight forward replacement. If the gas valve is to be replaced
remove the male 1⁄2'' gas connection from the old valve. Fit it to the replacement
valve using an approved jointing compound.
BEFORE re-assembling the gas valve/Venturi check the soundness of the cork gasket
and rubber washer. Replace if deterioration or damaged. Check and reset gas rate
and burner pressure (page 26 section 7).
NOTE:- Exchange of either gas valve or venturi will necessitate re-commissioning
of the appliance.
COMBUSTION AIR FAN - REMOVAL
Remove the main sub-assembly as stated above.
Remove the gas valve/Venturi assembly.
Disconnect the fan from the burner/adaptor casting by removing the (4) hexagon
nuts behind the mounting flange.
If necessary exchange the fan and re-assemble in reverse order.
Replace the fan sealing gasket if the existing shows signs of deterioration.
Check boiler/controls operation.
BURNER - REMOVAL
Remove the main sub-assembly stated above.
Disconnect the burner from the burner/adaptor casing by removing the (4) hexagon
nuts on top of the casting.
If necessary exchange the burner and reassemble in reverse order.
REPLACE the fan sealing gasket if the existing shows signs of deterioration.
Check boiler/controls operation.
HONEYWELL SEQUENCE CONTROL BOX - REMOVAL
Disconnect HT - Sensor - and Earth leads from control box.
Remove control box - (fixing screw under edge connector - RHS) by pulling to the
right. Remove the edge connector. DO NOT pull wires from connector.
If necessary exchange box and reassemble in reverse order.
Check boiler/controls operations.
Supplied By www.heating spares.co Tel. 0161 620 6677

COMPONENT EXCHANGE

IGNITION ELECTRODES AND
SENSOR REMOVAL
Both components are removed in the same
manner.
Disconnect the appropriate leads from the
sequence control box i.e.
Ignition Electrodes - HT and EARTH
Sensor - SENSOR LEAD
Remove the (2) cross head screws retaining
the component and carefully lift it up out of
the combustion chamber.
If necessary exchange the component.
ALWAYS fit a new ceramic sealing gasket.
Re-assemble in reverse order.
Check boiler/controls operation.
FLAME VIEWING WINDOW -
REMOVAL
Remove the (2) cross head screws retaining
the frame.
Lift off the frame and site glass.
Clean/exchange the site glass as necessary.
ALWAYS fit new ceramic sealing gaskets.
Re-assemble in reverse order.
DRY FIRING THERMOSTAT -
REMOVAL
Pull off the leads on top of the thermostat.
Unscrew the body (counter clockwise).
If necessary exchange and re-assemble in
reverse order.
Check boiler/controls operation.
STORE OVERHEAT THERMOSTAT
- REMOVAL
Remove (pull off ) the leads from the back.
Remove the central fixing nut.
Remove the split pin at the thermostat phial
pocket and pull out the phial.
Remove the thermostat by passing the capillary
tube and phial through the adjacent hole in
the bulkhead.
Replace as necessary and re-assemble in reverse
order. Finally depress thermostat reset button.
Check boiler/controls operation.
Page 40