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mini HE --- Installation & Servicing 39
52 OVERHEAT THERMOSTAT
REPLACEMENT
1 Remove outer and inner casing (r efer to frame 42).
2 Remove the screws A and the plate B.
A
B
3 Disconnect the wiring C .
4 Remove the spring D which holds t he overheat thermostat
on the pipe of the primary heat exchanger and remove it.
C
D
5 Re---assemble in reverse order.
6 Apply an adequate quantity of heat conducting
compound between the pipe and the thermostat.
53 FLUE TEMPERATURE PROBE
REPLACEMENT
1 Remove outer and inner casing (r efer to frame 42).
2 Disconnectthewiresfromthefluetemperatureprobe.
3 Unscrew the steel temperature probe adaptor A (complete
with the temperature probe) from the recuperator.
4 Ensure the probe is positioned as shown with the metal
sheath end level with the brass fixing nut B.
AB
5 Ensure that on the probe, the length C that enters the
recuperator is 18 mm.
C
6 F it the new probe/adaptor assembly into the recuperator
and re---assemble in reverse order.
A
54 TEMPERATURE PROBE
REPLACEMENT
1 Disconnect the electrical supply .
2 Remove the front and right hand side casing panels (refer
to frame 42).
Removal of CH temperature probe
3 ToremovetheCHtemperatureprobecloseoffthe
isolating cocks of the CH circuit at the bottom of the boiler.
4 R elease system pressure by opening the main circuit
drainage cock.
Do not release CH pressure using the pressure relief
valve. It may cause debris within the system to foul
the valve.
Removal of DHW temperature probe
3 To remove the DHW temperature probe close off the
isolating cock of the DHW circuit at the bottom of the
boiler.
4 E mpty the DHW circuit.
Replacement
5 Disconnect the leads from the probe to be replaced and
unscrew it .
6 Screw in the new probe, using a new gasket, reconnect
and re---assemble in reverse order.
CH temperature
probe
DHW temperature
probe
Drainage cock
SERVICING