62
1. Refer to Frame 45.
2. Drain the boiler. Refer to frame 59.
3. Remove the expansion vessel. Refer to Frame 71.
4. Firstly, increase access area by disconnecting the 22mm
pipe connection at top of pump chamber and bottom
of heat exchanger and remove pipe Refer to Frame 61
(no’s 5,6 & 7).
5. The automatic air vent head is retained in the pump
body with a bayonet connection. The air vent head and
oat assembly is removed by turning the head anti-
clockwise (viewed from above) and pulling upwards.
6. Reassembly is the reverse of the above. Ensure the air
vent head ‘o’ ring seal is in place when retting and the
new ‘o’ ring is tted to the return pipe top connection.
7. Ensure the air vent cap is loose.
8. Rell the boiler. Refer to Frame 24. Check for leaks
around the new air vent joint.
9. Check the operation of the boiler. Refer to Frames
32-
36.
5
63
1. Refer to Frame 45.
2. Drain the DHW system. Refer to Frame 59.
3. Turn the housing anti clockwise and pull
forward to remove the cartridge.
4. Using a pair of pliers, pull out the plastic
lter/ow regulator.
5. Clean or replace lter as necessary.
6. Reassemble in reverse order.
7. Rell the boiler.
8. Check operation of the boiler. Refer to
Frames 32-36.
3
4
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