51
SERVICING
isar - Installation and Servicing
nm8767
Air vent
Plug
Spark Generator
Fan
75
SAFETY RELIEF VALVE REPLACEMENT
1. Refer to Frame 57.
2. Remove the casing front and bottom panels. Refer to
Frames 49 & 50.
3. Drain the boiler. Refer to Frame 77.
4. Remove the discharge pipe.
5. Remove the 4 screws retaining the rear support plate and
withdraw the plate.
Note. The M4 screws fit the casing and the self -tapping screws
fit the plastic pump and valve housings, as shown.
6. Withdraw the securing pin.
76
AUTOMATIC AIR VENT REPLACEMENT
1. Refer to Frame 57.
2. Remove the boiler front and sealing
panels. Refer to frames 49 & 50.
3. Drain the boiler. Refer to frame 77.
4. Remove the turret from the boiler. Refer to
frame 26.
5. Release the silicon tubing from the
sample point.
6. Release the electrical connections from
the dry fire thermistor.
7. Release the electrical connections from
the spark generator.
8. Remove the M5 x 10 screw retaining the
top flue manifold casting.
9. Remove the casting.
10. Remove the fan from the boiler. Refer to Frame 52.
11. Remove the burner from the heat exchanger. Refer to
Frame 53.
12. Unscrew the air vent from its heat exchanger mount and replace.
13. Re assemble the boiler in reverse order.
14. Refill the boiler. Refer to frame 36. Check for leaks around the new air vent
joint.
15. Check the operation of the boiler. Refer to frame 57.
7. Remove the safety valve.
8. Fit the new safety valve and refit the securing pin.
9. Reassemble in reverse order, ensuring correct
location of screws in the support plate and that tabs
on the pump and valve housings engage in slots.
10. Reconnect the discharge pipe.
11. Refill the boiler. Refer to Frame 36.
12. Check operation of the boiler. Refer to Frame 57.
Support plate
M4 screw
2012
M4 screw
Self tapper
screw
Discharge pipe
Safety relief valve
Securing pin
2039
SERVICING
203319-3.pmd 27/03/2008, 08:1551
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