q)
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: It is likely that the heat exchanger will still contain water.
Refer to Figures 48
a)
Ensure supply voltage is isolated, and that the gas supply is isolated.
b)
Remove the gas control valve, fan & burner assembly; refer to
section 6.2.
c)
Remove the heat exchanger: refer to section 9.8.
d)
Disconnect the condensate drainpipe sump adaptor from the heat
exchanger; refer to section 9.12.
e)
Remove the existing flue hood from the heat exchanger, two screws,
and fit the replacement flue hood onto the heat exchanger; use new
flue hood seals; refer to Figure 48.
f)
Fit the condensate drainpipe sump adaptor to the heat exchanger
and flue hood.
g)
Unscrew the flue sensor from the existing flue hood and fit onto the
new flue hood; refer to section 9.16.
47
HEAT EXCHANGER
FIXING
POINTS
MANUAL AIR VENT
FLUE SENSOR
RETAINING
CLIP
FLUE HOOD
9.9
h)
Re-assemble in reverse order; check integrity of the flow and return
pipe 'O' rings and fibre washers and replace as necessary. Ensure
that all joints and seals are correctly re-fitted.
i)
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.
48
FLUE HOOD
FLUE SEAL
FLUE HOOD
GASKET
FIXING POINTS
CONDENSATE DRAIN
WATER TEMPERATURE SENSORS
9.10
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.
49
FLOW SENSOR
RETURN SENSOR
FLOW SENSOR
TEMPERATURE SENSOR POSITION WHEN
USING STANDARD TOP OUTLET PIPEWORK
TEMPERATURE SENSOR POSITION WHEN
USING OPTIONAL BOTTOM OUTLET PIPEWORK
35
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