42
1
2
fig. 74
GW 650/2
7.18 Replacement of DHW
microswitch.
•
Isolate appliance from electricity
supply.
•
Remove front casing as in section
7.1.3.
•
Lower front control panel as in
section 7.1.6.
•
Lift off microswitch retaining ’bow’
spring,
•
Pull microswitch forward to remove
from mounting bracket and
disconnect wires.
•
Reassemble in reverse order.
•
Carry out electrical checks (see
section 5.1).
7.19 Replacement of DHW heat
exchanger
•
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 the top two unions (1, fig.
74), bottom left hand union and
backnut (2, fig. 74)
Note: The connection between the
DHW heat exchanger and water
section is a push fit joint.
•
Pull heat exchanger forward to
remove.
•
Reassemble in reverse order using
new sealing rings supplied.
•
Refill and repressurise the boiler
(see Section 5.4).
