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54 PRESSURE GAUGE REPLACEMENT
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. Refill the boiler. Refer to Frame 23.
6. Check operation of the boiler. Refer to
Frames 30 & 31.
55 SAFETY RELIEF VALVE REPLACEMENT
1. Refer to Frame 41.
2. Drain the boiler. Refer to Frame 53.
3. Remove the clip on return thermistor. Refer
to frame 45.
4. Pull out and remove the clip (positioned
behind the safety valve) retaining the safety
valve.
5. Undo the safety valve pipe compression
fitting positioned outside the boiler casing.
6. Lift out the safety valve/pipe assembly.
7. Remove the safety valve pipe and transfer
to the new safety valve.
8. Reassemble in reverse order ensuring the
retaining clip is correctly fitted, the pipe
compression fitting retightened and return
thermistor is re-clipped.
9. Refill the boiler. Check operation of the
boiler. Refer to Frames 30 & 31.
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.
5. 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.
6. Reassembly is the reverse of the above. Ensure the air vent head 'o'
ring seal is in place when refitting and the new 'o' ring is fitted to the
return pipe top connection.
7. Ensure the air vent cap is loose.
8. Refill 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.
46
SERVICING
3
4
Dust Cap
Installation and Servicing
5
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