7
d) Turn on the gas service cock.
e) Move the gas control slide to the ignition position. See
fig. 6.
Observe the pilot burner. Press in the central button of
the control slider and hold depressed while pushing
the Piezo igniter button two or three times. The pilot
should light. Wait approximately twenty seconds and
then release the centre button of the control slider.
The pilot should remain alight. If the pilot does not light,
repeat the operation until a flame is established.
Note: On initial light up, or after any prolonged shut down,
the pilot may take several attempts to establish due to
the presence of air in the gas supply system.
The pilot flame should envelope approximately 5 mm
of the thermocouple head.
f) Move the control slider fully to the right for maximum
output, see fig. 7. Fully open the hot water tap. The
main burner should light.
Fig. 6
G661_013
g) Check the dynamic inlet gas pressure. For Natural Gas
the inlet pressure should be 20.0 mbar and for LPG
the pressure should be 28.0 mbar (Butane) or 37.0
mbar (Propane).
If the pressure is not correct then check the gas supply
to the appliance.
If the pressure is correct then turn off the hot water tap
and move the slider to the off position, see fig. 8.
Fig. 7
G661_012
Turn off the gas service cock. Remove the pressure
gauge and tighten screw A, see fig. 5.
h) Loosen screw D and connect the pressure gauge to
the test point, see fig. 9.
Fig. 8
G661_01
1
Re-light the appliance as described above. Turn the
temperature control to maximum.
i) Operate the appliance for at least two minutes, then
check that the burner pressure is as stated in Technical
Data – Table 1.
j) Turn off the hot water tap. Close the gas service cock.
Remove the pressure gauge and tighten screw D.
k) Re-fit the appliance casing and secure by re-fitting the
temperature control bezel.
Fit the temperature control knob and the hot and cold
water tap knobs.
l) On completion of the commissioning and testing of the
system, the installer should hand over the appliance to
the user with reference to the following.
1) Give the Users Operating Instructions leaflet to the
user.
2) Explain and demonstrate the lighting and shutdown
procedures.
3) Advise the user of the precautions necessary to
prevent damage to the system and to the building
in the event of the system remaining inoperative
during frost conditions.
4) Stress the importance of an annual service by a
competent person.
9.
Inspection and Service
To ensure continued efficient operation of the appliance, it
is recommended that it is checked and serviced as
necessary at regular intervals.
The frequency of servicing will depend upon the particular
installation conditions and usage but 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.
Before commencing any service operation turn off the gas
supply at the main gas service cock
Carry out the service operation as follows.
9.1Remove the front casing by first removing the
temperature control knob and the two water tap knobs.
Unscrew the temperature control knob bezel and
remove to release the appliance casing.
Pull forward the lower front of the casing to clear the
tap spindles and lift up the casing to unhook it from the
appliance back plate.
9.2
Heat Exchanger
Inspect and clean the heat exchanger flueways as
necessary.
To remove the heat exchanger, isolate the appliance
from incoming cold water supply at the inlet cock. Open
the taps to release any remaining water pressure and
drain the appliance.
Undo the brass union nut on the pilot air supply pipe
and withdraw the pipe from the air inlet collector.
Disconnect the push on terminals from the overheat
thermostat at the top of the heat exchanger.
Pull out the retaining clips at the inlet and outlet
connections on the water control body, and spring out
the copper inlet and outlet pipes from the control body.
Fig. 9
G662_042
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