Keston System s30, Installation And Servicing Instructions

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Installation and Servicing
SECTION 3 - SERVICING
3.26 HEAT ENGINE REPLACEMENT
Refer also to Section 2.1 - ‘Boiler Exploded View’
IMPORTANT
Before starting the removal procedure, protect the gas and electrical controls with a waterproof sheet or plastic bag.
12. Remove the two retaining spring clips and remove pipes.
13. Remove the condensate rubber pipe. Refer to Section 3.17, no. 2.
14. Remove the two heat exchanger fixing 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 fixing point and engage tabs
onto the heat exchanger.
17. Reassemble in reverse order, ensuring the heat exchanger LH
retaining bracket is correctly positioned. Replace any new ‘o’
rings supplied with new heat exchanger and replacing gaskets
or seals if any sign of damage is evident. When replacing the
spring clips located on the return pipe connection, ensure clip is
oriented to correctly match connecting pipe diameters.
18. Ensure the trap/siphon is filled with water. Refer to Secion 3.17.
19. Refill the boiler. Refer to Section 2.13.
20. Check operation of the boiler. Refer to Section 2.22 & 2.23.
1. Refer to Section 3.8.
2. Drain the boiler. Refer to Section 3.19.
3. Remove the fan / venturi assembly and place on one side.
Refer to Section 3.3
4. Remove the burner and place on one side. Refer to Section
3.4.
5. Remove the ignition and detection electrodes. Refer to
Sections 3.13 & 3.14.
6. Remove the spark generator. Refer to Section 3.15.
7. Remove the gas valve. Refer to Section 3.16.
8. Remove the expansion vessel. Refer to Section 3.27.
9. Remove the flow and return thermistor. Refer to Sections
3.12 & 3.25.
10. Remove the 2 M5 screws retaining the gas valve mounting
bracket and transfer bracket to the new heat exchanger.
11. Undo the pump union nut and remove pipe.
14
11
12
10
9
9
12
16
Shown as 180º position
SER
VICING