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9.19
AUTO AIR VENT
Refer to Figure 45
a)
Ensure supply voltage is isolated.
b)
Drain down the appliance; refer to section 9.23.
c)
Disconnect the vent tube from the auto air vent and check that it
is free from blockage.
d)
Unscrew the auto air vent, and fit replacement.
e)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
f)
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.
9.20
CONTROL PCB
Refer to Figures 21, 29 & 50
a)
Ensure supply voltage is isolated.
b)
Remove the casing front panel, unscrew and lower the control
fascia panel.
c)
Unplug the electrical leads from the PCB. Refer to section 7.
d)
Unplug the BCC if fitted.
e)
Unscrew and remove the PCB plastic cover.
f)
Unclip the user interface ribbon cable.
g)
Unclip the PCB and withdraw.
h)
Fit the new PCB and plug in the BCC if previously used.
i)
Re-assemble in reverse order, ensuring user interface ribbon
cable is attached securely.
If the boiler requires resetting turn the control knob anti-clockwise to
'STANDBY' position and then back to 'ON' within two seconds.
Refer to section 5.4.
50
PCB HOUSING
BCC
Electrical
Connectors
Securing
Screws
•
•
9.21
TIME CLOCK
Refer to Figures 51
a)
Ensure supply voltage is isolated.
b)
Remove the decorative front panel, unscrew and lower the
control fascia panel.
c)
Unplug the electrical leads from the PCB. Refer to section 7.
d)
Unplug the four electrical leads from the back of the clock.
e)
Remove the four retaining screws and withdraw the clock from
the control panel.
f)
Fit the new clock and re-assemble in reverse order.
Refer to Figure 28
a)
Ensure supply voltage is isolated.
b)
Remove the electrical lead to the DHW flow switch.
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)
Undo the nut connecting the DHW flow switch to the DHW inlet
isolating cock.
e)
Undo the nut connecting the DHW flow switch to the water feed
pipe, and remove the DHW flow switch, (containing the DHW Flow
Regulator), and DHW Filter.
f)
The assembly can now be flushed clean using water, and parts
replaced as necessary.
g)
Re-assemble in reverse order, using a new fibre washer; ensure
that all joints and seals are correctly re-fitted.
h)
Open the DHW inlet isolating cock and vent air from the system
by opening each hot water tap in the house in turn.
REGULATOR AND DHW FILTER
9.22
DHW FLOW SWITCH, DHW FLOW
39
751094 ACE HE INST MANUAL:751094 ACE HE 28/9/10 09:46 Page 41
