Pump Automatic Air Vent Replacement - Keston 30C Installation And Servicing Instructions

67 SAFETY RELIEF VALVE RENEWAL
1. Refer to Frame 50.
2. Drain the boiler. Refer to Frame 65.
3. Remove the condensate trap/siphon. Refer to
Frame 61.
4. Remove expansion vessel. Refer to Frame 78.
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 fitted
to the top of the return pipe.
12. Refill boiler. Refer to Frame 30. Check
operation of boiler. Refer to Frames 40 & 41.

68 PUMP AUTOMATIC AIR VENT REPLACEMENT

1. Refer to Frame 50.
2. Drain the boiler. Refer to frame 65.
3. Remove the expansion vessel. Refer to Frame 78.
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 67 (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 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 30. Check for leaks
around the new air vent joint.
9. Check the operation of the boiler. Refer to Frames 40
& 41.
Keston 30C -
Installation and Servicing
SERVICING
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