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WD52/0/1997
iii)
iv)
v)
7.4.3
Neons (Fig. 5.7.1 items 114 & 115)
i)
ii)
iii)
iv)
v)
vi)
vii)
7.4.4
Flow Overheat (Fig. 5.7.2 item 71) , Flow High Limit (Fig. 5.7.2 item 72) & Flue
Protection Thermostats (Fig. 5.7.2 item 67)
i)
ii)
iii)
iv)
v)
vi)
7.4.5
Water Pressure Switch (Fig. 5.7.2 item 73)
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
7.4.6
Ignition Control Box (Fig. 5.7.1 item 106)
i)
ii)
Installation & Servicing Instructions
Chapter 7 : Replacement Of Parts
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)
Gain access (Section 7.2)
Remove the push on connectors from the neon taking note of the correct
positions.
Press in the catches and push the neon forward through the control
panel.
Pull the centre core of the neon from its housing to expose the bayonet
fitting bulb.
Reassemble (Section 7.3)
Check for correct operation of the neons.
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.
Flue protection thermostat only
The thermostat seal is maintained via a small stainless steel disc
between thermostat and flue pipe. It is advised to use a small quantity of
leak sealant around the edge of the steel disc to prevent condensate
leakage from the flue.
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)
Drain the system to below the level of the appliance using the drain off
tap at the base of the heat exchanger.
Remove the push on connectors from the water pressure switch taking
note of the correct positions.
Unscrew the pressure switch.
Reassemble (Section 7.3).
NB:
Use a little jointing compound or PTFE tape on the thread.
Refill the system (See Section 4 - Commissioning).
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
The Keston 130 Condensing Boiler
Page : 43
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