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Page 30
6. ROUTINE ANNUAL SERVICING
To ensure safe and 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.
a) IMPORTANT Before commencing a service or changing a component, ISOLATE
the mains electric supply TURN OFF the gas supply at the main service cock and
when necessary turn off and drain the heating/domestic water system.
b) To gain access to all components: First remove the front panel by unscrewing
the two retaining screws towards 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 lifting front edge from the brass studs provided
and slide/lift forward; the top front support bar can be removed by unscrewing
the brass studs at the top and the two self-tapping screws on the front.
A combustion sampling point has been provided on the flue outlet at the top of
the boiler. Remove the hex. screw to access (See Figures 1.1 and 1.2).
6.1. BURNER, GAS VALVE AND VENTURI –FAN SUB-ASSEMBLY
Remove the sub assembly shown in figures 6.1 and 6.2 for inspection as follows:
-
•
Disconnect HT – Sensor and Earth leads from the burner.
•
Slacken flexible air hose clip around Venturi inlet and remove hose.
•
Pull the sensor line off the nipple on the gas valve.
•
Remove the plug in electrical connector from the gas valve.
•
Disconnect the gas line (union connection) from the gas valve.
•
Remove the (3) hexagon nuts fixing the assembly to the top of the boiler using
a 11mm AF spanner.
•
Lift the assembly clear of the mounting studs – ease the end of the gas line out
of its fitting.
•
If the assembly is clean (apart from acceptable dust) it will not be necessary
normally to disassemble it further, unless a careful inspection shows signs of
deterioration.
•
Should it become necessary to remove or replace components, follow the
procedure under ‘Component Exchange’. Carefully clean the assembly i.e. remove
nay dirt with soft brush and check for signs of wear or deterioration of supply
leads, burner, igniter 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 6.2).
6.2. 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.
•
Remove the condense trap from the boiler.
•
Remove the (3) hexagon nuts fixing the bottom boiler casting using a 11mm AF
spanner.
•
Lower the bottom casting clear off the mounting studs – ease the flue outlet from
its socket.
•
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.
6.3. CLEANING THE CONDENSATE TRAP
This procedure must be carried out after the
appliance has been switched off and made
safe. Remove the trap by undoing nuts ‘A’
and ‘B’. Clean the trap by removing plug ‘C’
taking precautions regarding water in the
trap (figure 6.3). Refit in reverse order and
check for leaks. It is normal to expect a build
up of deposits in the trap.
6.4. POWERFLUSHING/CLEANING OF
HEATING SYSTEM
If it is proposed to ‘powerflush’ the heating
system we would recommend that the
GulfStream appliance is isolated from the
heating system being cleaned. Failure to do
this could seriously damage the appliance.
When carrying out the work always comply
fully with the manufacturers instructions for
the ‘power flushing’ equipment being used.
If in any doubt please consult our Technical
Helpline.
Figure 6.1 Venturi and Fan Assembly
ROUTINE ANNUAL SERVICING
Summary of Contents for GS A-Class 12/OV
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