SERVICING
mini HE
--- Installation & Servicing
35
44 OVERHEAT THERMOSTAT
REPLACEMENT
1 Remove outer and inner casing (refer to frame 34).
2 Remove the screws A and the plate B.
A
B
3 Disconnect the wiring C .
4 Remove the spring D which holds the 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.
45 FLUE THERMOSTAT REPLACEMENT
1 Remove outer and inner casing (refer to frame 34).
2 Disconnect the wires from the flue thermostat.
3 Unscrew and remove the thermostat probe A from the
recuperator.
4 Remove the protective cap B and unscrew the screws C
which hold the flue thermostat to the frame.
5 Remove the flue thermostat.
6 Assemble the flue thermostat carrying out the removal
operations in reverse sequence.
B
A
C
46 THERMISTOR REPLACEMENT
1 Disconnect the electrical supply.
2 Remove the front and right hand side casing panels (refer
to frame 34).
Removal of CH thermistor
3 To remove the CH thermistor close off the isolating cocks
of the CH circuit at the bottom of the boiler.
4 Release 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 thermistor
3 To remove the DHW thermistor close off the isolating cock
of the DHW circuit at the bottom of the boiler.
4 Empty the DHW circuit.
5 Disconnect the leads from the thermistors to be replaced
and unscrew it .
6 Screw in the new sensor, using a new gasket, reconnect
and re---assemble in reverse order.
CH thermistor
DHW thermistor
Drainage cock
S
E
R
V
IC
IN
G