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WD51/2/1997 Chapter 7 : Replacement Of Parts
vi)
Reassemble (Section 7.3)
7.4.7
Air Pressure Switch (Fig. 5.7.1 item 109)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Remove the push on connectors from the air pressure switch taking note
of the correct positions.
iv)
Disconnect the union to one plastic tube connection and pull off the
second plastic tube from the air pressure switch.
v)
Unscrew the two screws mounting the air pressure switch body to the
boiler casing.
vi)
Reassemble (Section 7.3)
NB:
7.4.8
Combustion Blower (Fig. 5.7.3 item 78)
NB:
This unit is heavy and must therefore be handled carefully when
replacing.
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Disconnect the wires connecting the blower to the relay (relay terminals
number 6 and 3)
vi)
Remove the allen screws fixing the air intake pipe flange and the gas/air
mixture pipe flange to the blower.
v)
Unscrew the three bolts fixing anti-vibration mounts to the combustion
blower through the base of the cabinet.
vi)
Reassemble (Section 7.3)
NB:
vii)
Reset the gas rate (See Section 4 - Commissioning)
7.4.9
Gas Control Valve (Fig. 5.7.3 item 91)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Remove the cover concealing the electrical connections on the front of
the gas valve.
iv)
Remove the push on connectors exposed taking note of the correct
positions.
v)
Remove the push on connectors to the gas low pressure switch taking
note of the correct positions.
vi)
Remove the earth connection to the side of the gas valve.
vii)
Remove the plastic air tube to the base of the gas valve.
viii)
Remove the four allen screws securing the gas inlet flanged connections
to the gas control valve.
ix)
Undo the four bolts fixing the base of the gas control valve to the gas
outlet block.
x)
Remove the gas valve.
xi)
Unscrew the gas low pressure switch at its connection to the gas control
valve body.
xii)
Reassemble (Section 7.3)
xiii)
Reset the gas rate (See Section 4 - Commissioning)
7.4.10 Gas Low Pressure Switch (Fig. 5.7.3 item 101)
i)
Isolate the appliance (Section 7.1)
Installation & Servicing Instructions
Ensure the yellow/green earth connection tag is securely fixed
behind the lower mounting screw.
When reassembling inspect any gaskets for damage and replace
if necessary.
The Keston 170 Condensing Boilers
Page : 44
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