43
SERVICING
isar -
Installation and Servicing
68
SAFETY RELIEF VALVE REPLACEMENT
1. Refer to Frame 50.
2. Remove the casing front and bottom panels. Refer to
Frames 42 & 43.
3. Drain the boiler. Refer to Frame 70.
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.
69
AUTOMATIC AIR VENT REPLACEMENT
1. Refer to Frame 50.
2. Remove the boiler front and sealing panels. Refer to
Frames 42 & 43.
3. Drain the boiler. Refer to Frame 70.
4. Remove the turret from the boiler. Refer to Frame 23.
5. Release the silicon tubing from the sample point.
6. Release the electrical connections from the flue
thermistor.
7. Release the electrical connections from the spark
generator.
8. Remove the M5 nut retaining the flue casting spring clip
and remove the spring clip.
9. Undo the 2 M5 x 10 flue spring clip retaining bracket
screws and remove the bracket.
10. Remove the M5 x 10 screw retaining the flue casting.
11. Remove the flue casting.
12. Unscrew the air vent from the extension pipe on the boiler
boss.
13. Fit the new air vent, complete with 'O' ring provided, and
reassemble in reverse order.
Note.
In the event that the extension pipe is removed at the
same time as the air vent, remove it from the air vent
and refit it into the heat exchanger before fitting the
new air vent, ensuring that its ‘O’ ring seal is in place.
14. Refill the boiler. Refer to Frame 29.
15. Check the operation of the boiler. Refer to Frame 50.
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 29.
12. Check operation of the boiler. Refer to Frame 50.
Support plate
M4 screw
2012
M4 screw
Self tapper
screw
Discharge pipe
Safety relief valve
Securing pin
2039
SER
VICING
