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6.2.3
36
Burner trolley assembly
Fig. 26 Burner trolly assembly
IV)
Check the operation and interlocking of any air inlet and
extraction fans.
V)
Check the correct connection and operation of any exter-
nal controls.
VI)
With the control thermostat on a high setting turn on the
on/off switch at the water heater control panel, check that
the combustion air inlet damper cycles open and then
closes, that there is a spark at the ignition electrode, that
the pilot safety shut off valve is heard to be opening and
that the water heater goes to lock-out in approximately 5
secs later as there is no gas.
Check 3
With the electricity supply switched off check the
gas train downstream of the gas inlet service cock as
follows:
Refer to Gas trains, fig. 34.
1.
Ensure that gas service cock and pilot manual cock are
closed.
2.
Unseal and connect a pressure gauge to test point 10/1
and unseal test point 10/2.
3.
Open and then close the gas service cock to pressurise
up to the 1st safety shut off valve and the pilot manual
cock.
4.
Allow 1 min. for temperature stabilisation and then check
for any loss of pressure during the next 2 minutes.
5.
If there is a pressure loss the pipework up stream of the
1st safety shut off valve should be checked with a suitable
leak detection fluid with the gas service cock open.
6.
If no leak is found, this indicates that the 1st safety shut
off valve is letting by and should be replaced.
7.
With test points 10/1 and 10/2 unsealed connect them
together with a short piece of flexible tubing which incor-
porates a tee connection to the pressure gauge.
18IP22B
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