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Refer to Figures 18 & 22
a)
Ensure supply voltage is isolated.
b)
Drain down the appliance; refer to section 9.23.
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.
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.
Note: the pressure relief valve should not be used to
drain the system.
9.13
PRESSURE RELIEF VALVE
Refer to Figure 46
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 46.
e)
Reconnect the electrical lead.
9.14
WATER TEMPERATURE SENSORS
46
Refer to Figure 47
a)
Ensure supply voltage is isolated.
b)
Disconnect the electrical lead from the flue sensor.
c)
Twist the flue sensor to release the bayonet connection and
remove from the heat exchanger.
d)
Fit the replacement flue sensor and reconnect the electrical lead
(blue plug).
9.15
FLUE SENSOR
Note: the thermal 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.
!
47
Refer to Figure 48
a)
Ensure supply voltage is isolated.
b)
Drain down the appliance; refer to section 9.23.
c)
Close the DHW inlet isolating cock, open a DHW tap at the
lowest point in the system and allow the pressure to dissipate. Close
this tap again.
d)
If it is suspected that the plate heat exchanger is blocked or is
leaking then proceed as follows:
e)
Undo the nut connecting the flow pipe from the main heat
exchanger to the plate heat exchanger.
f)
Undo the nut connecting the pipe from the hydroblock to the
plate heat exchanger, and rotate out of the way.
g)
Undo the nut connecting the plate heat exchanger to the CH
flow water isolating cock pipe.
h)
Undo the nut connecting the plate heat exchanger to the DHW
outlet pipe.
i)
Undo the nut connecting the plate heat exchanger to the DHW
water isolating cock pipe.
j)
Lift up the plate heat exchanger and remove.
k)
Fit the replacement plate heat exchanger, using new case seals
as necessary, ensuring the filter is fitted correctly.
l)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
m)
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.
9.16
PLATE HEAT EXCHANGER
FLOW THERMISTOR
RETURN THERMISTOR
DHW THERMISTOR
FLUE SENSOR
THERMAL FUSE
37
751094 ACE HE INST MANUAL:751094 ACE HE 28/9/10 09:46 Page 39