45
SERVICING
i
combi
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Installation and Servicing
56 saFETy RELIEF VaLVE RENEWaL
1. Refer to Frame 40.
2. Drain the boiler. Refer to Frame 53.
3. Remove the return thermistor. Refer to
frame 64.
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 and
the pipe compression fitting retightened.
9. Refill the boiler. Check operation of the
boiler. Refer to Frames 29 & 30.
57 pUMp aUTOMaTIC aIR VENT REpLaCEMENT
1. Refer to Frame 40.
2. Drain the boiler. Refer to Frame 53.
3. Remove the return thermistor. Refer to
Frame 64.
4. Using a suitable screwdriver positioned
between the air vent dust cap and the plastic
protrusion, turn the air vent carefully anti
clockwise to disengage and lift to remove.
5. Fit the new air vent and ensure dust cap is
open
6. Re-assemble in reverse order ensuring the
return thermistor is replaced.
7. Refill the boiler. Check operation of the
boiler. Refer to Frames 29 & 30.
4
Dust Cap
3
5
7
4
s
ER
VICIN
g
