36
8
47
Note: It is likely that ther
e will still be some water spillage when the Hydroblock is removed.
Refer to Figures 18 & 22
a)
Ensur
e supply voltage is isolated.
b)
Drain down the appliance; r
efer to section 9.24.
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.
9.13
PRESSURE RELIEF VALVE
Refer to Figur
e 48
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 48.
e)
Reconnect the electrical lead.
9.14
WATER TEMPERATURE SENSORS
48
Refer to Figur
e 49
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.
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.
9.15
FLUE SENSOR
!
