SERVICING
& SPARES
INSTALLATION & SERVICING INSTRUCTIONS
39
REPLACEMENT PARTS
6-720-611-730b (12.05)
REPLACEMENT PARTS
Domestic hot water heat exchanger:
Before removing the heat exchanger shut the
inlet valves, drain the hot water circuits and tank.
The pipe (A) may be removed between the flow
sensor outlet and the plate heat exchanger to
improve access to the rear connections.
Use new seals when replacing the heat
exchanger.
Pressure gauge:
Drain the appliance.
Twist the pressure gauge head (B) anti-
clockwise until removed.
Expansion vessel:
Drain the appliance.
Move control panel into service position.
Remove locking screw (C) from vessel bracket.
Hinge pressure vessel out and lift from brackets.
Undo the union connection at the top of the
vessel.
Set the pressure of the new vessel to that
required by the system.
Pressure relief valve:
Drain the appliance.
Disconnect drain pipe from valve (D)
Undo nut retaining valve to flow pipe.
Remove valve.
Replace sealing washer and fit a new valve.
Condensate trap:
Move control and pressure vessel into service
position.
Remove inner case door.
Remove access panel (E) at the base of the
inner casing.
Remove screw retaining trap (F) and push trap
downwards until clear.
Remove trap from boiler along with pipe to
condensate pump.
Gas valve:
Check that the gas cock is turned off.
Remove condensate pump.
1
Undo the union, within the inner casing,
securing the valve to the gas/air tube.
2
Remove the white plastic cap from the gas
valve (G).
3
Release the gas inlet union at the gas valve.
4
Pull off the solenoid connections at the rear
of the gas valve.
Transfer the inlet pipe assembly to the new
gas valve.
Check for gas soundness when the new gas
valve has been fitted.
Re-check the combustion performance.
See 'Setting the gas/air ratio'.
E
F
3
1
2
G
4
C
D
B
A
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