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WD53/0/1999
Chapter 7 : Replacement Of Parts
7.0
GENERAL
The following must always be carried out by a competent/qualified person.
7.1
PRECAUTIONS
i)
Always switch off the mains electricity supply
ii)
Gain access to the appliance (Section 7.2) and turn off the gas supply at the
appliance service cock.
WARNING :
7.2
ACCESS
i)
Open the front doors by turning the locating catches 90 degrees to release.
7.3
REPLACEMENT PROCEDURES
i)
Always replace in the reverse order unless otherwise stated.
ii)
Electrical connections must be remade in accordance with the Wiring Diagram
(Section 5.5).
iii)
Test the soundness of any gas carrying or water carrying joint broken during the
service procedures.
7.4
ELECTRICAL COMPONENTS
7.4.1
Master and Module On/Off Switches (Fig. 5.7.4 items 214 & 215)
i)
i)
iii)
iv)
v)
v)
7.4.2
Module Boiler Return Thermostats (Fig. 5.7.2 item 84)
i)
ii)
iii)
iv)
v)
7.4.3
Module Flow Overheat (Fig. 5.7.2 item 97) , Flow High Limit (Fig. 5.7.2 item
99) & Flue Protection Thermostats (Fig. 5.7.2 item 86)
i)
ii)
iii)
iv)
v)
7.4.4
Module Water Pressure Switch (Fig. 5.7.2 item 88)
i)
ii)
iii)
Installation & Servicing Instructions
Parts of the boiler internal wiring will remain live even after turning
the boiler ON/OFF switch to the OFF position. Shut off the power
supply at the isolating switch before working on the appliance.
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors from the switch taking note of the
correct positions.
Press in the catches and push the switch forwards through the control
panel.
Reassemble (Section 7.3)
Check for correct operation of the switch.
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors from the thermostat taking note of the
correct positions.
Unscrew the two retaining screws and remove the thermostat.
Reassemble (Section 7.3)
NB:
When fitting the new thermostat it is an advantage to smear a
thin film of heat sink compound between the thermostat and
mounting surface. This, combined with fitting the new thermostat
tightly to the mounting surface, ensures a good contact.
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors from the thermostat taking note of the
correct positions.
Unscrew the two retaining screws and remove the thermostat.
Reassemble (Section 7.3)
NB:
When fitting the new thermostat it is an advantage to smear a
thin film of heat sink compound between the thermostat and
plate. This, combined with fitting the new thermostat tightly to the
plate, ensures a good contact.
Isolate the appliance (Section 7.1)
Shut off the water supply to the appliance.
Gain access (Section 7.2)
The Keston 260 & 340 Condensing Boilers
Page : 43
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