13
5
5..3
3 S
Sllo
ow
w IIg
gn
niittiio
on
n
- Check burner ignition which should be smooth and
quiet (not explosive).
- If slow ignition requires adjustment proceed as in
Section 6.1 to remove front case.
- Adjust slow ignition device A (see fig. 16) 1/4 turn
at a time. Refit front case and recheck operation.
N
NO
OT
TE
E ::
Turning screw A clockwise delays ignition.
5
5..4
4 M
Miiccrro
ossw
wiittcch
h
N
NO
OT
TE
E ::
During Commisionning it is important that the correct operation of the microswitch on the side of the
gas section is checked.
Whilst the microswitch is factory set, it may require adjustment. When the appliance is at rest the fan runs conti-
nuously at low speed. Check operation as follows - set temperature selector to - then open draw-off. The fan
should now come to high speed before the burner ignites. On closing draw-off, the burner should extinguish
before the fan resumes at low speed. If fan/burner operational sequence is NOT as described see Section 7.13.
5
5..5
5 T
Th
he
e P
Prre
essssu
urre
e S
Sw
wiittcch
h
Check the operation of the pressure switch as follows : Open draw off, fan comes to high speed and the bur-
ner ignites. Close draw off, burner extinguishes and when fan resumes at low speed listen for the “click” as the
relay changes over.This should be followed within 15 seconds by a lighter “click” as the pressure switck changes
over. If the time separation is greater than 15 seconds or if the pilot extinguishes it suggests that the pressure
switch is incorrectly set. (See Section 7.11).
5
5..6
6 T
Th
he
errm
mo
oe
elle
eccttrriicc C
Ciirrccu
uiitt
The Thermoelectric Circuit is fitted with an interrupter so that if the air flow is not proved on high speed the cir-
cuit is incomplete and the flame supervision device will operate. In the case of intermittant pilot faillure or per-
manent pilot failure the termocouple circuit can be checked with a British Gas Multimeter or suitable Millivolt
Meter to determine if the pilot failure is due to poor thermoucouple output, high resistance through Relay-1
contact or faulty thermoelectric valve. (See Section 2.9, fig. 1).
The thermocouple output measured at the Printed Circuit Board terminals should be greater than 12 millivolts.
The millivoltage drop through the relay (i.e. terminal to terminal) should not be greater than 4 millivolts.
5
5..7
7 H
Ha
an
nd
diin
ng
g O
Ov
ve
err
Hand all instructions to the user or purchaser and instruct in the correct and safe operation of the appliance.
Explain to the user or purchaser that if the appliance is not used for long periods it is recommended that the
appliance is drained, this is particulary important during the winter months (see servicing instructions for pro-
cedure to drain appliance).
Finally, advice the user or purchaser that, for continued efficient and safe operation of the appliance it is impor-
tant that servicing is carried out annually to the manufactures recomendations by a C.O.R.G.I. registered person.
F
Fiig
g.. 1
16
6
A
