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EXPANSION VESSEL
9.13
Refer to Figure 48
a)
Ensure supply voltage is isolated.
b)
Drain down the appliance; refer to section 9.24.
c)
Remove the spire clip on the case in front of the expansion vessel.
d)
Undo the nut connecting the flexible hose to the expansion vessel
and remove hose.
e)
Slide the expansion vessel forward and remove.
f)
Slide the replacement expansion vessel in place.
g)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
h)
Open the isolating cocks and vent air from the system using the
manual air vent. Re-pressurise the system as necessary and check
for water leaks.
WATER TEMPERATURE SENSORS
9.15
Refer to Figure 49
a)
Ensure supply voltage is isolated.
b)
Disconnect the electrical lead from the sensor to be changed.
c)
Unclip the sensor from the pipe and remove.
d)
Clip the replacement sensor onto the pipe and position as shown in
Figure 49.
e)
Reconnect the electrical lead.
FLUE SENSOR
9.16
Refer to Figure 50
a)
Ensure supply voltage is isolated.
b)
Disconnect the electrical lead from the flue sensor.
c)
Unscrew the flue sensor and remove from the flue hood.
d)
Fit the replacement flue sensor and reconnect the electrical lead
(blue plug).
48
EXPANSION VESSEL
PRESSURE RELIEF VALVE
9.14
Refer to Figures 18 & 24
a)
Ensure supply voltage is isolated.
b)
Drain down the appliance; refer to section 9.24.
c)
Undo the nut securing the discharge tail pipe to the pressure relief
valve and remove. Undo the nut securing the pressure gauge
capillary, and remove.
d)
Undo the nut securing the pressure relief valve to the CH flow pipe
and remove the pressure relief valve.
e)
Fit the replacement pressure relief valve, using new fibre washers.
f)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
g)
Open the isolating cocks and vent air from the system using the
manual air vent. Re-pressurise the system as necessary and check
for water leaks.
Note: the pressure relief valve should not be used to drain the system.
TOP MOUNTING RAIL
EXPANSION VESSEL
REMOVE SPIRE CLIP
FROM THIS POSITION
CONNECTION POINT
FOR FLEXIBLE HOSE
BOTTOM MOUNTING RAIL
49
49a FLOW SENSOR
49b RETURN SENSOR
75m
m
± 10m
m
50m
m
± 10m
m
38
751030 MANUAL (NEW) 21/9/10 08:41 Page 16
