40
2
1
fig. 69
GW 607/1
2
1
fig. 70
GW 646/1
5
1
6
2
3
4
5
fig. 71
GW 647/1
7.13 Replacement of automatic
air release
•
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.
•
Unscrew cap (2, fig. 68) of auto air
release and remove inner
components.
•
Replace with new inner
components and reassemble in
reverse order.
•
Refill and repressurise the boiler
(see section 5.4).
7.14 Replacement of automatic
bypass
•
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 spring clip (1, fig. 66).
•
Disconnect wires from overheat
thermostat (2, fig. 66).
•
Remove temperature gauge phial
from primary flow pipe.
•
Undo unions (3, fig. 66). Remove
bypass/connecting pipe.
•
Undo union (1, fig. 69) to remove
bypass.
•
Reassemble in reverse order using
sealing washers supplied.
•
Refill and repressurise the boiler
(see section 5.4).
7.15 Replacement of diverter
valve
•
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.
Open hot water taps.
•
Lower front control panel as in
section 7.1.6.
•
Remove pump as in 7.12
•
Remove three screws (1, fig. 70)
and pump support bracket (2, fig.
70).
•
Remove clip and disconnect pressure
tube (1, fig. 71) from diverter valve.
•
Undo nut (2, fig. 71) and
disconnect pressure guage tube.
•
Disconnect union (6, fig. 71).
•
Disconnect electrical connections
from DHW microswitch (3, fig 71).
•
Remove clip (4, fig. 71) by pulling
down.
•
Undo two unions (5, fig. 71).
•
Undo union (3, fig. 72).
•
Carefully pull diverter valve and
cold water inlet pipe away from
DHW heat exchanger Lift valve and
cold water inlet pipe (1, fig. 72)
out of boiler.
•
Reassemble in reverse order.
•
Carry out electrical checks (see
section 5.1).
•
Refill and repressurise the boiler
(see section 5.4).
