66
HEAT ENGINE RENEWAL
Refer also to Frame 5 - ‘Boiler Exploded View’
IMPORTANT
Before starting the removal procedure, protect the gas and electrical controls with a waterproof sheet or plastic bag.
1. Refer to Frame 40.
2. Drain the boiler. Refer to Frame 55.
3. Remove the fan / venturi assembly and place on one side.
Refer to Frame 41.
4. Remove the burner and place on one side. Refer to Frame
43.
5. Remove the ignition and detection electrodes and divertor
actuator head. Refer to Frames 45, 46 and 49.
6. Remove the spark generator. Refer to Frame 47.
7. Remove the gas valve. Refer to Frame 48.
8. Remove the expansion vessel. Refer to Frame 67.
9. Remove the ow thermistor. Refer to Frame 65.
10. Remove the 2 M5 screws retaining the gas valve mounting
bracket and transfer bracket to the new heat exchanger.
11. Undo the inlet pipe union nut and remove the retaining
spring clip and remove pipe.
12. Undo the ow pipe union nut and remove pipe.
13. Remove the condensate rubber pipe. Refer to Frame 50,
no. 2.
14. Remove the two heat exchanger xing screws.
15. Remove the Heat exchanger slide out of location bracket.
16. If replacement sump required: Rotate heat exchanger
assembly 180º. Place new sump onto heat exchanger,
ensuring correct orientation and seal is in place. Then
gently apply pressure to the base of the sump at each tab
xing point and engage tabs onto the heat exchanger.
17. Ensure the trap/siphon is lled with water. Refer to Frames
50 & 55.
18. Rell the boiler.
19. Check operation of the boiler. Refer to Frames 29 & 30.
14
11
12
10
9
9
12
16
Shown as 180º position
SERVICING
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