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26
9.12
DRAINING THE BOILER
9.15
WATER FLOW REGULATOR
9.14
DHW HEAT EXCHANGER
Refer to section 7.2.
a)
Ensur
e supply voltage is isolated.
b)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
c)
Unplug the four electrical leads fr
om the back of the clock.
d)
Remove the four r
etaining screws and withdraw the clock from
the control panel.
e)
Fit the new clock and r
e-assemble in reverse order.
To replace components in sections 9.13 to 9.21 it is necessary to
drain the boiler and/or the DHW circuit. There may be some
slight water spillage, so electrical components should be
protected.
Refer to section 5.
a)
CH: Close the CH flow and r
eturn isolating valves. Attach a
hose to the drain point and open the drain valve.
b)
DHW
: Close the cold water inlet valve and open all DHW
taps to empty the DHW circuit.
DHW thermistor: Close the cold water inlet valve and open all
DHW taps to empty the DHW circuit.
CH/O’Heat thermistor: Close the boiler flow and return isolating
valves and drain the boiler’s CH circuit, refer to section 9.12.
d)
Disconnect the electrical lead fr
om the thermistor.
e)
Unscr
ew the thermistor from the manifold.
f)
Fit the new ther
mistor and re-assemble in reverse order.
Ensure that the copper washers are correctly fitted to provide
a sealed joint.
g)
Re-commission the system. Refer to section 5.
Refer to Fig. 34
a)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
b)
Remove the DHW heat exchanger
. Refer to section 9.14.
The plastic regulator is located in the top LH entry port of the
heat exchanger
c)
Fit the new r
egulator, ensuring that it is the correct way round.
d)
Re-assemble in r
everse order and re-commission the DHW
circuit. Refer to section 5.
Refer to Fig. 34
a)
Remove the casing fr
ont panel and lower the controls fascia
panel, refer to section 9.3.
b)
Remove boiler bottom panel, r
efer to section 9.14.
c)
Drain both the boiler and DHW cir
cuits, refer to section 9.12.
d)
Remove the two spring clips securing the bypass pipe and pull
out the pipe.
e)
Remove the two socket scr
ews securing the heat exchanger to
the water manifolds and push the heat exchanger downwards
to release it.
f)
Remove the water flow r
egulator, noting its position and
orientation.
g)
Fit the water flow r
egulator to the new heat exchanger.
h)
the new heat exchanger and r
e-assemble in reverse order.
i)
Re-commission the heating and hot water systems. Refer
to section 5.
9.11
TIME CLOCK
9.13
CH/OVERHEAT OR
DHW THERMISTORS
9.10
DHW FLOW SWITCH (Hall Effect)
Refer to Fig. 34
a)
Ensur
e supply voltage is isolated.
b)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
c)
Draw the switch for
ward to unclip it from the brass manifold.
d)
Disconnect the electrical lead fr
om the switch.
e)
Fit the new switch and r
e-assemble in reverse order.
Note:
The Hall ef
fect magnet is housed within the DHW sanitary
flow detector and should not normally need replacement.
9.9
CH MICROSWITCH
Refer to Fig. 34
a)
Ensur
e supply voltage is isolated.
b)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
c)
W
ithdraw the retaining spring clip to release the microswitch
assembly from the spindle
d)
Remove the thr
ee screws securing the halves of the plastic
housing and slide the microswitch forwards to release it from
the housing.
e)
Disconnect the electrical leads fr
om the micro switch.
f)
Fit the new micr
o switch and re-assemble in reverse order.
9.
16
PUMP
Refer to Fig. 34
a)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
b)
Drain the boiler
. Refer to section 9.12.
c)
Remove the pump ter
minal box cover and disconnect the
electrical leads.
d)
Either undo the two pump unions and r
emove the entire pump
(using new sealing gaskets), OR remove the four socket screws
and remove the pump head only.
e)
Fit the new pump (or pump head) and r
e-assemble in
reverse order.
f)
Re-commission the system. Refer to section 5.
Refer to Fig. 34
a)
Ensur
e supply voltage is isolated.
b)
Remove the casing fr
ont panel and lower the controls fascia
panel. Refer to section 9.3.
c)
Isolate the boiler fr
om the system. Refer to section 5:
