HAMWORTHY HEATING LTD
29
SHAFTESBURY HE
500001049/N
Figure 1.1 Boiler Installation Typical
C
A
BURNER
MOUNTING
FLANGE
B
BLAST TUBE
PENETRATION
FIRE
BRICK
Figure 11.6 – Combustion Chamber and Burner Data
14.0 REPLACEMENT OF PARTS
There are a number of components listed below which
can be replaced simply and quickly by following the
given procedure. In each case the operation of each
replaced component must be checked by carrying out
the appropriate part of the commissioning procedure.
See
Section 11.0: COMMISSIONING & TESTING.
NOTE: Isolate all electrical supplies to the boiler
and turn off the gas supply before removing
controls cover and commencing any servicing or
component exchange procedure.
Note :
-For replacement of burner components refer
to the burner manufacturers instructions.
14.1 Control and High/Low Thermostat(s)
Record the existing temperature setting of the
thermostat for reference before removal.
NOTE:
before attempting to hinge the fascia down,
the thermostat knobs must be pulled off and the
temperature limiter (high limit) cover knob
unscrewed and removed.
Remove the upper front casing panel. Turn the two
latches a quarter turn using a screwdriver or coin
and lift off. The fascia can then be hinged
downwards by unlatching the catch on the top right
hand using a screwdriver.
Withdraw the appropriate thermostat bulb from the
thermostat pocket and disconnect the electrical
connections noting the terminal identifications.
Remove the two screws securing the thermostat to
its mounting bracket and withdraw the thermostat
body whilst feeding the capillary through the hole in
the control panel mounting plate.
Fit the new thermostat and ensure the capillary is
correctly located within the thermostat pocket. Close
the fascia and run the boiler to check for correct
operation. Set the thermostat to the previously noted
setting.
14.2 Temperature Limiter (Limit Thermostat)
The temperature limiter replacement procedure
follows that of the control thermostat with some
minor differences as detailed below:
With the plastic cover removed, unscrew the holding
nut and carefully withdraw the thermostat body
Prior to fitting the replacement thermostat, set to
100°C and check the operation of the device by
carefully applying a heat source to the bulb.
