36
Refer to Figur
es 21 and 25
a)
Ensur
e supply voltage is isolated.
b)
Drain down the appliance; r
efer to section 9.19.
c)
Undo the nut securing the dischar
ge 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 pr
essure relief valve to the CH flow
pipe and remove the pressure relief valve.
e)
Fit the r
eplacement pressure relief valve, using new fibre
washers.
f)
Re-assemble in r
everse order; ensure that all joints and seals are
correctly re-fitted.
i)
Open the isolating cocks and vent air fr
om the system using the
manual air vent. Re-pressurise the system as necessary and check
for water leaks.
Note: the pr
essure relief valve should not be used to
drain the system.
9.12
PRESSURE RELIEF VALVE
Refer to Figur
e 49
a)
Ensur
e supply voltage is isolated.
b)
Disconnect the electrical lead fr
om the sensor to be changed.
c)
Unclip the sensor fr
om the pipe and remove.
d)
Clip the r
eplacement sensor onto the pipe and position as
shown in Figure 49.
e)
Reconnect the electrical lead.
9.13
WATER TEMPERATURE SENSORS
49
Refer to Figur
e 50
a)
Ensur
e supply voltage is isolated.
b)
Disconnect the electrical lead fr
om the flue sensor.
c)
T
wist the flue sensor to release the bayonet connection and
remove from the heat exchanger.
9.14
FLUE SENSOR
50
9.15
CONDENSATE DRAIN SYSTEM
Refer to Figur
e 30
a)
Ensur
e supply voltage is isolated.
b)
Open the drain sump cap, while holding a r
eceptacle beneath
to capture any condensate.
c)
Disconnect the condensate drainpipe fr
om the appliance.
d)
Detach the condensate drainpipe fr
om the heat exchanger sump
adaptor, by gently pulling down.
e)
Remove the condensate drain system, clean or r
eplace as
necessary.
f)
Re-assemble in r
everse order; ensure that all joints and seals are
correctly re-fitted.
9.16
PRESSURE GAUGE
Refer to Figur
e 51
a)
Ensur
e supply voltage is isolated.
b)
Drain down the appliance; r
efer to section 9.19.
c)
Disconnect the pr
essure gauge capillary gland nut from the
pressure relief valve.
d)
Having r
emoved the decorative front and lowered the control
fascia disengage the pressure gauge from the fascia panel, and
remove the gauge.
e)
Fit the new pr
essure gauge and re-assemble in reverse order.
f)
Open the isolating cocks and vent air fr
om the system using the
manual air vent. Re-pressurise the system as necessary and check for
water leaks.
d)
Fit the r
eplacement flue sensor and reconnect the electrical lead
(blue plug).
Note: the ther
mal fuse is not removable or a
serviceable item, should the heat exchanger
overheat then the thermal fuse will blow
(blocking code ‘5’) and the entire heat
exchanger will need replacing.
!