55
SAFETY RELIEF VALVE RENEWAL
1. Refer to Frame 41.
2. Drain the boiler. Refer to Frame 53.
3. Remove the condensate trap/siphon. Refer to
Frame 50.
4. Remove expansion vessel. Refer to Frame 61.
5. Disconnect the electrical connection from the
return thermistor.
6. Disconnect the 22mm pipe connection at the rear
of the pump outlet.
7. Pull off the clip retaining the pipe to the heat
exchanger swing the pipe to clear the pump and
remove pipe.
8. Undo the safety valve union connection.
9. Withdraw the clip securing the safety valve.
10. Lift safety valve from boiler.
11. Fit the new safety valve and reassemble in
reverse order ensuring the new ‘o’ ring is tted to
the top of the return pipe.
12. Rell boiler. Refer to Frame 23. Check operation
of boiler. Refer to Frames 30 & 31.
1. Refer to Frame 41.
2. Drain the heating system. Refer to
Frame 53.
3. Unscrew the pressure gauge and
discard.
4. Fit new pressure gauge, using suitable
jointing compound.
5. Rell the boiler. Refer to Frame 23.
6. Check operation of the boiler. Refer to
Frames 30 & 31.
54
PRESSURE GAUGE RENEWAL
6
7
5
8
9
10
56
PUMP AUTOMATIC AIR VENT REPLACEMENT
1. Refer to Frame 41.
2. Drain the boiler. Refer to Frame 53.
3. Remove the expansion vessel. Refer to Frame 61.
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 55 (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 23. Check for leaks around the new air
vent joint.
9. Check the operation of the boiler. Refer to Frames 30 & 31.
5
Dust Cap
SERVICING
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