41
7.15.1 Replacement of water section
diaphragm (fig. 72).
•
Turn off boiler as in Section 7.1.1.
•
Remove bottom cover as in section
7.1.3.3.
•
Open hot water taps.
•
Remove clip (2), undo union (3)
•
Remove 6 screws (4).
•
Pull water section base away from
DHW heat exchanger and drop
down.
•
Remove diaphragm.
•
Replace in reverse order.
•
Carry out electrical checks (see
section 5.1).
•
Refill and repressurise the boiler
(see section 5.4).
7.16 Replacement of pressure
and temperature gauge
•
Turn off boiler as in section 7.1.1.
•
Remove front casing as in section
7.1.3.
•
Release CH water pressure and
drain boiler as in section 7.1.2.
•
Lower front control panel as in
section 7.1.6.
•
Undo union (2, fig 71) on diverter
valve to release pressure gauge
tube.
•
Remove temperature gauge phial
from pocket on primary flow pipe.
•
Press spring clips on side of gauge
to remove from front panel.
•
Replace in reverse order.
•
Refill and repressurise the boiler
(see section 5.4).
7.17 Replacement of differential
pressure switch
•
Turn off boiler as in section 7.1.1.
•
Remove front casing as in section
7.1.3.
•
Release CH water pressure and
drain boiler as in section 7.1.2.
•
Lower front control panel as in
section 7.1.6.
•
Remove clip at rear of switch by
pulling it to the left.
•
Disconnect wires from switch (1,
fig. 73).
•
Pull pressure differential switch
forward to remove.
•
Reassemble in reverse order.
•
Carry out electrical checks (see
section 5.1).
•
Refill and repressurise the boiler
(see section 5.4).
1
2
3
4
5
fig. 72
GW 635/1-a
1
fig. 73
GW 649/1
