Keston Combi 35kw User Manual download pdf (Page 50)

SERVICING

Keston Combi - Installation and Servicing

SAFETY RELIEF VALVE RENEWAL

1. Refer to Frame 45.

2. Drain the boiler. Refer to Frame 60.

3. Remove the condensate trap/siphon. Refer to

Frame 56.

4. Remove expansion vessel. Refer to Frame 73.

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. Rell boiler. Refer to Frame 22. Check operation

of boiler. Refer to Frames 36.

PUMP AUTOMATIC AIR VENT REPLACEMENT

1. Refer to Frame 45.

2. Drain the boiler. Refer to frame 60.

3. Remove the expansion vessel. Refer to Frame 73.

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 62 (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 retting and the

new ‘o’ ring is tted to the return pipe top connection.

7. Ensure the air vent cap is loose.

8. Rell the boiler. Refer to Frame 22. Check for leaks

around the new air vent joint.

9. Check the operation of the boiler. Refer to Frame 36.

SERVICING

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Keston Combi 35kw User Manual Page 50

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