48
Response 80 / 100 / 120
- Installation
SER
VICING
78
CH EXPANSION VESSEL REPLACEMENT
SERVICING
If the CH expansion vessel is faulty, there are 3 options:
A. If it has a punctured diaphragm, but is
otherwise leak free, then it can be left in place
and a new vessel added to the system, external to the boiler, provided it is of adequate
capacity and pre-charge pressure.
B. If there is at least 600mm clearance above the boiler, the expansion vessel can be
changed without removing the boiler (RH exit flues will have to be disturbed). Access to
the water connection of the expansion vessel is
either by removal of the right hand side
boiler panel (if there is 200mm RHS clearance)
or by removal of the fan and gas valve.
C. If there is insufficient headroom, the boiler will need to be removed. In this case,
access to the water connection of the expansion vessel will be possible by removing
the RH boiler side panel.
View of underside of boiler
Front of boiler
res 6101
For option B, proceed as follows:
B1.Isolate the electric, gas, and water services.
B2.Drain down the boiler CH circuits, using the appropriate
drain cocks.
B3.Where RH clearance is available. Unscrew the 10 screws
securing the RHS panel and remove the panel to gain
access to the expansion vessel connector.
Where RH clearance is NOT available. Remove the fan
(refer Frame 49) and gas valve (refer Frame 62) to gain
access to the expansion vessel connector.
B4.Disconnect the flue, if RH exit, and remove to the right
(general details are reverse of Frames 18 & 28).
B5.Undo the 3 screws securing the boiler panel above the
expansion vessel, and remove the panel.
C3.Undo all service unions at the base of the boiler, and
unplug and disconnect the electrical supply lead, which is
secured by one screw in the centre of the boiler base.
C4.Disconnect the flue turret and place to one side (reverse of
the assembly described in Frames 18 & 28).
C5.Lift the boiler off the wall and place horizontally, at a
convenient working height.
C6.Follow instructions B3 to B6.
C7.Return the boiler to the wall mounting frame, remaking all
connections, including the flue.
C8.Fill, pressurise and test.
C9.Remove the filling loop.
B6.Undo the water connection at the bottom of the expansion vessel.
Lift out the vessel and fit the replacement, reassembling in reverse
order - using new gaskets and 'O' rings where appropriate.
B7.Fill, pressurise and test.
B8.Remove the filling loop.
For option C, proceed as follows:
C1.Isolate the electrical, gas and water services.
C2.Drain down the boiler CH/HW circuits using the appropriate boiler
drain cocks (refer Frame 68).
Summary of Contents for responce 100
Page 1: ......
Page 62: ...62 Response 80 100 120 Installation NOTES ...