46
fig. 76
GW 468/0
7.11 Replacement of CH
expansion vessel
In the unlikely event of a failure of the
CH expansion vessel follow proce-
dure 7.11.1 or 7.11.2 depending
upon the installation
circumstances.
7.11.1. Boiler installed with
air/flue duct to left/-
right hand side, or
vertical flue installation
(where 600mm vertical
clearance exists above
the boiler) - fig. 76
•
Turn off the boiler as in Section
7.1.1.
•
Release CH water pressure and
drain boiler as in Section 7.1.2.
•
Slacken 2 screws (1).
•
Slide expansion vessel upwards
and out of boiler casing.
•
Replace in reverse order.
•
Refill and repressurise the boiler
(see Section 5.4).
7.11.2 Boiler installed with air
flue duct to the rear, or
vertical flue installation
(where less than
600 mm vertical
clearance exists above
the boiler)
EITHER
Remove the boiler front the wall as
follows:
•
Turn off the boiler as in Section
7.1.1.
•
Release CH water pressure and
drain boiler as in Section 7.1.2.
•
Remove front casing as in Section
7.1.3
•
Disconnect external wiring from
boiler terminal box.
•
Disconnect flow and return connec-
tions at compression connection
above boiler CH service valves
(1, fig. 77).
•
Disconnect gas connection at com-
pression joint on top of gas service
valve (2, fig. 77).
•
Disconnect domestic hot and cold
water connections on the water
section (3, fig. 77).
fig. 77
GW 416/0
