Glow-worm Xtramax - Manual (Page 34)

34 4000116705-2
IMPORTANT INFORMATION
Replacement of parts must be carried out by a competent
person.
WARNING: Before commencing the replacement of any
component, isolate appliance from electrical supply and turn off
gas at service cock.
When replacing components it may be necessary to renew
sealing washers, gaskets and 'O' rings. If new ones are supplied
with replacement components they must be used.
Unless stated otherwise parts are replaced in reverse order to
removal.
If any gas carrying components are disturbed, removed or
replaced, it will be necessary on completion to check for gas
soundness with leak detection fluid and if necessary carry out
functional test of the controls.
20.1 Domestic hot water thermistor
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.5.
• Locate domestic hot water thermistor on hot water flow pipe on
right hand side of boiler adjacent to gas valve, see diagram
20.2.
• Unclip thermistor from pipe.
• Disconnect leads from thermistor.
• Fit leads to replacement thermistor and fit thermistor to pipe.
The polarity is not important.
20.2 Central heating thermistor
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.5.
• Locate central heating thermistor on heating flow pipe on
centre of boiler, see diagram 20.3.
20 Replacement of Parts
9331
Diagram 20.2
11761
Diagram 20.3
DOMESTIC HOT
WATER
THERMISTOR
CENTRAL
HEATING
THERMISTOR
To drain the domestic hot water circuit (DHW) of the boiler
Close isolating valve/throttle (m)
Note: This valve is closed when screwed fully clockwise.
Open the DHW drain point (z) located below the DHW pump.
To drain the central heating circuit (CH) of the boiler
Close isolating valves (q) and (v)
Note: These valves are closed when slots are at right angles to direction of flow.
Open drain valves (r) and (u)
Diagram 20.1
9126
➜
u
➜
m
v q
r
➜
9527
z
➜
• Unclip thermistor from pipe.
• Disconnect leads from thermistor.
• Fit leads to replacement thermistor and fit thermistor to pipe.
The polarity is not important.