45
sERVICINg
Indep Combi -
Installation and Servicing
57 saFETy RELIEF V aLVE RENEW aL
1. Refer to Frame 40.
2. Drain the boiler. Refer to Frame 55.
3. Remove condensate trap/siphon. Refer to Frame 50.
4. Remove expansion vessel. Refer to Frame 67.
5. Disconnect electrical connection from return thermistor.
6. Disconnect 22mm pipe connection at rear of pump
outlet.
7. Pull off clip retaining the pipe to the heat exchanger.
Swing pipe to clear the pump and remove pipe.
8. Undo safety valve union connection.
9. Withdraw clip securing the safety valve.
10. Lift safety valve from boiler.
11. Fit new safety valve and reassemble in reverse order
ensuring new ‘o’ ring is fitted to the top of return pipe.
12.
Refill boiler. Check operation of boiler. Refer to Frames
29 & 30.
58 pUMp aUTOMa TIC aIR VENT REpLaCEMENT
1. Refer to Frame 40.
2. Drain the boiler. Refer to frame 55.
3. Remove the expansion vessel. Refer to Frame 67.
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 57.
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. Check for leaks around the new air vent joint.
9. Check the operation of the boiler. Refer to Frames 29 & 30.
5
6
7
5
8
9
10
Dust Cap
4
59 DhW FLOW TURBINE CaRTRIDgE REpLaCEMENT
1. Refer to Frame 40.
2. Drain the boiler. Refer to Frame 55.
3. Remove condensate trap/siphon. Refer to Frame 50.
4.
Remove the DHW flow turbine sensor. Refer to Frame 54.
5. Unscrew the top connection to access the internal part.
6. Fit the new turbine cartridge.
7.
Refit the turbine flow sensor
8. Reassemble in reverse order.
9.
Refill the boiler.
10. Check operation of the boiler. Refer to Frames 29 & 30.
5
7
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VICIN
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