24
j)
Remove the 4 nuts holding the combustion chamber fr
ont
cover in place.
k)
Remove the gas contr
ol valve, fan & burner assembly, by
carefully pulling forward the combustion chamber front and
pivoting the assembly forward, then disengage the gas valve feed
pipe from the casing, by lifting up the assembly. Take care not to
damage the insulation.
l)
The assembly may then be inspected. If the gas valve is to be
replaced refer to section 9.3.
m)
Re-assemble in r
everse order.
6.3
BURNER
Inspect, and if necessar
y clean the main burner ports using a soft
brush or vacuum cleaner. Do not use a wire brush or any
abrasive material.
Inspect the inside of the combustion chamber for debris. If
necessary, clean the inside of the tubes with a soft brush. Do not
brush the insulation at the rear, check the integrity of the
combustion chamber insulation panels, if damaged they will
require replacement.
6.4
IGNITION & DETECTION ELECTRODES
a)
Inspect the ignition and detection electr
odes in situ. If
necessary, clean using a soft brush. If either the electrode or the
ceramic insulation shows signs of damage or wear, replace the
electrode(s) and their gasket.
b)
Check that the alignments of the ignition and detection
electrodes are correct. Refer to Figure 26. Adjust by carefully
bending the tip of the electrode rod whilst supporting the base of
the rod. Do not put any pressure on the ceramic insulation.
& HEAT EXCHANGER
6.5
COMBUSTION CHAMBER
The condensate Drain has a r
emovable cap, Figure 27, which
allows the removal of debris that may be caught within it. Place
a bowl under the cap to catch the condensate and remove the
cap. Any debris inside will be expelled at this point. Replace the
cap ensuring a good seal is made. Discard the condensate and
debris.
6.6
CONDENSATE DRAIN
27
Close the water inlet isolating cock, open a domestic hot water
tap at the lowest point in the system and allow the pressure to
dissipate. Close this tap again. Undo the nut holding the flow
switch to the water inlet isolating cock to gain access. The filter
can now be removed, and cleaned as necessary by flushing with
water. Re-assemble in reverse order, ensuring all seals are
replaced correctly.
6.7
DOMESTIC COLD WATER INLET FILTER
26
