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7.8
To Replace Fuse or PCB
7.10
To replace pressure switch
Lift off pressure switch dis-engaging
it from the high
- Isolate electrical supply.
pressure tube.
-
- Remove two screws securing
PIaSk
turret cover.
Remove "0" ring fromspiggot
on the underside of the
pressure switch.
- Pull off tag connectors from terminals.
- Replace in reverse order referring to colour coding
- Remove low pressure tube from pressure switch.
label on top of appliance.
- Remove two screws securing pressure switch to
bracket.
7.11
Adjustment
of pressure switch
a) If pilot extinction occurs within 10 seconds of turning the hot tap off, it is possible that the pressure switch is out
of adjustment, as if the pressure switch remains in the high flow position in excess of 10 seconds after the fan
switches to low speed interruption of the current to the thermoelectric
Valve
OCCUIS.
It is possible to adjust the pressure switch to ensure a rapid return
from
high to
IOW flow.
Adjustment
Sequence :
Isolate electrical supply.
(A) FUSE : - Pull out fuse holder (A) from board and
slide fuse out of holder.
(B) PCB
: - Remove connections (fan, microswitch,
pressure switch)
- Disconnect
mains supply cable from
terminals.
- Remove two nuts and washers (B) retai-
ning thermocouple
and conductor lead.
- Remove fuse and ease board from
plastic retaining clips.
- Remove four screws and remove PCB.
- Re-assemble in reverse order.
Adjusting the pressure switch.
Ensure the front case is on.
Isolate electrical supply.
Remove two screws securing plastic turret cover and
lift off cover.
Remove terminal cover from pressure switch exposing
the adjusting screw (A) and remove securing paint.
- Set a multimeter
to 240V scale and connect
it
across the common and one other terminal of the
switch.
_. Re-establish electrical supply and ensure that gas is
off at gas control.
- Turn on a hot tap to give high fan speed.
- Using a suitable screwdriver
screw the adjusting
screw (A) in until changeover
of the pressure
switch contacts are observed.
- Screw out adjusting screw (A) 3 turns to achieve
the setting point.
- Check operation
of the pressure switch (see sec-
tion 5.5).
- Replace the plastic terminal cover on the pressure
switch.
- Replace the plastic turret cover and fixing screws.
b) If main burner extinction occurs during hot water demand, it is possible that the pressure switch is out of ad-
justment.
Screw adjusting screw (A) out until flush with top of moulding, then follow adjustment
sequence
above.
20
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