ii)
Gain Access (section 8.2)
iii)
Shut off the water supply (CWS) to the DHW heat exchanger.
iv)
Isolate the waterways to the pump using the system isolation valves.
v)
Drain the system to below the level of the appliance using the drain off tap (Fig.
6.7.4 - 2/2 item 180) at the base of the boiler return pipe.
vi)
Disconnect the two union nuts from the DHW heat exchanger (Fig. 6.7.2 - 3/3
item 86 & 100 and Fig. 6.7.2 - 2/3 item 86).
vii)
Remove the DHW heat exchanger.
viii)
Reassemble (Section 8.3)
NB:
When reassembling inspect the gaskets for damage and replace if
necessary.
8.11
EXPANSION VESSEL
(Fig. 6.7.2 - 1/3 item 58)
i)
Isolate the appliance (Section 8.1)
ii)
Gain Access (section 8.2)
iii)
Isolate the waterways to the pump using the system isolation valves.
iv)
Drain the system to below the level of the appliance using the drain off tap (Fig.
6.7.4 - 2/2 item 180) at the base of the boiler return pipe.
v)
Disconnect the flexible hose (Fig. 6.7.2 - 1/3 item 116) from the expansion vessel.
vi)
Undo the pin (Fig. 6.7.4 - 1/2 item 4) and the EV bracket (Fig. 6.7.4 - 1/2 item 211)
from the cabinet frame.
vii)
Remove the expansion vessel
.
viii)
Reassemble (Section 8.3)
NB:
When reassembling inspect the gasket for damage and replace if necessary.
WD388/0/2004 Chapter 8 : Replacement Of Parts The Keston C36 Combi & C36P Combi Boilers
Boilers
Installation & Servicing Instructions
Page : 46
