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

To ensure safe, efficient operation of the appliance, it is necessary to carry out
routine servicing at regular intervals. The frequency of servicing will depend on the
particular installation conditions and use to which the appliance is put. In general,
once a year should be adequate.
It is the law that any service work must be carried out by a competent person such
as British Gas or other CORGI registered personnel.
1. ROUTINEANNUALSERVICING
IMPORTANT Before commencing a service or changing a component, ISOLATE the
mains electric supply TURN OFF the gas supply at the main service cock.
To gain access to all components:
Refer to Figures 1, 2, 4 and 5. First remove the front panel by unscrewing the two
retaining screws at the top LH and RH sides. Lift the panel slightly and swing it
forward from the top. Lift the panel to disengage it at the bottom edge. Remove the
top panel by unscrewing the screws at the LH and RH sides.
A combustion sampling point has been provided on the flue outlet at the base of
the boiler. Remove the hex. screw to access (See Figure 4).
2. BURNER, GAS VALVE - VENTURI FAN SUB - ASSEMBLY.
Remove the sub-assembly for inspection Figures 31 and 32. Disconnect HT - Sensor
and Earth leads from Honeywell Sequence control box.
Remove the Sequence Control box (fixing screw is under edge connector (RHS) - by
pulling to the right. The edge connector need not be removed.
Slacken flexible air hose clip around Venturi inlet and remove hose.
Pull the sensor line off the nipple on the gas valve.
Remove the edge connector at the top rear of the fan housing.
Disconnect the gas line (union connection) from the gas valve.
Remove the (3) hexagon nuts fixing the assembly to the top of the boiler.
Lift the assembly clear of the mounting studs - ease the end of the gas line out of
its fitting. When clear lift sufficiently to disconnect the mains supply plug under
the bottom rear of the fan housing.
FLAME SENSOR
FIXING SCREWS
(4)
FLAME VIEW
WINDOW
BURNER
Supplied By www.heating spares.co Tel. 0161 620 6677
FIXING SCREWS (4)
GAS VALVE (MFC)
FIXING SCREWS (3)
FIXING SCREWS (2)
ELECTRODE ASSEMBLY
VENTURI INLET
Figure 31

SERVICING

If the assembly is clean (apart from acceptable
dust) it will not be necessary normally to dis-
assemble it further, unless careful inspections
shows signs of deterioration.
Should it be necessary to remove or replace
components, follow the procedures under
'Component Exchange' . Carefully clean the
assembly-remove any dust with a soft brush
and check for signs of wear or deterioration
of supply leads, burner, ignitor and sensor
assemblies. The burner must show no sign of
oxidation or cracking.
Check and if necessary reset the ignition spark
gap to 4.5 ± 0.5mm and the flame sensor
position Figure 32.
3. CLEANING THE HEAT
EXCHANGER
Reach down and carefully lift out the central
core (ceramic fibre) of the boiler heat
exchanger. Examine and replace if there are
indications of it beginning to break up or there
is evidence of ceramic particles dropping to
the bottom of the heat exchanger. Clean the
heat exchanger if necessary with a brush and
remove any debris.
After completing this part of the service
procedure refit the ceramic core to the heat
exchanger and reassemble the appliance in
reverse order.
CARRY OUT A GAS SOUNDNESS TEST.
Examine the remainder of the appliance
checking for signs of deterioration or wear
in other components - replace as necessary.
Look for signs of water leaks - repair/ replace
as necessary.
Refer to the 'Commissioning' Procedure.
Operate the appliance - preferably
commencing with a dry run (GAS OFF). Check
all safety controls and boiler operation under
normal conditions. Adjust as necessary,
(BEHIND)
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