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3.10 CH CIRCULATION PUMP HEAD REPLACEMENT
1. Refer to Section 3.4 for front panel
removal.
2. Isolate and Drain the HIU. Refer to
Section 3.5.
3. Disconnect the plug of the low
voltage harness from the pump by
placing a small flat bladed screw
driver into the slot in the clip. Push
down lightly to disengage the clip
and pull the plug towards you to
remove from the pump assembly.
4. Disconnect the plug of the high
volatge harness by placing a small
flat bladed screw driver into the
slot in the clip. Push down lightly to
disengage the clip and pull the plug
towards you to remove from the
pump assembly.
5. Remove the pump head by
removing the 4 x allen screws.
6. Fit the new pump head.
7. Reassemble in reverse order
8. Refill the HIU. Refer to Section 2.5.
9. Check that the HIU operates in
both DHW & CH modes.
3.11 PUMP AUTOMATIC AIR VENT REMOVAL & REPLACEMENT
1.
Refer to Section 3.4 for front panel
removal.
2.
Isolate and drain the HIU. Refer to
Section 3.5.
3.
Remove the expansion vessel. Refer to
Section 3.8.
4.
The automatic air vent head is retained
in the pump body with a bayonet
connection. The air vent head and float
assembly is removed by turning the
head anti-clockwise (viewed from above)
and pulling upwards. Note: There are 2
flat surfaces on the top of the air vent to
allow additional grip to help remove the
air vent.
a.
Check the condition of the air vent
mounting seal to ensure it is correctly
located, and clean replace if necessary.
5.
Reassemble in reverse order. Ensure the
air vent head 'o' ring seal is fitted.
6.
Ensure the air vent cap is loose.
a.
Check the condition of the pump head
mounting seal and clean or replace if
necessary.
Refill the HIU. Refer to Section 2.5.
7.
Check for leaks around the new air vent
joint.
8.
Check that the HIU operates in both
DHW & CH modes.
Installation and Servicing
SECTION 3 - SERVICING
35
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