Service manual

Maintenance

To Remove Heat Exchanger

As each item is removed keep the relevant screws with that item

DRAWING F

1. . Remove assembly `A` (see Manifold & Burner Box Removal page 39)

2. Remove assembly `B` (see Fan Removal page 41)

DRAWING H

1. Disconnect Heat Exchanger Pipes, undo screws `A` from plates `1` and spin plates out of the

way and remove plates.

2. Pull the 2 cold feed pipes `2` from out of the by pass servo

3. Pull Hot feed pipe `3` from it`s housing.

4. Undo 2 PCB securing screws and pull out PCB and leave hanging picture H screws C

DRAWING G

1. Unclip anti frost heaters,items 1A,1B, 1C and leave hanging outside the case.

2. Unclip the Thermal link ,connection 6

3. Disconnect Heat Exchanger Thermistor, connection 7

4. Disconnect Sparker connection, connection 8

DRAWING F

1. Disconnect breather pipe from gas valve, item H

2. Undo screw below air box screw d

3. Undo 3 screws under fan bracket on base of heat exchanger, screws c

4. Undo 2 screws top left hand corner of heat exchanger, screws a

5. Whilst supporting heat exchanger assembly, remove 2 screws top right hand side of heat ex-

changer, screws b

6. Remove complete heat exchanger

7. Unclip remove over heat stat and thermal fuse from around heat exchanger, item F

8. Remove heat exchanger thermistor ensuring the `O` ring is not left in place, item E

9. Remove sparker from base of heat exchanger, item G

10. Undo screws from cover of air box, item H screws f

11. Remove side box and top of air box

12. Undo screws holding base of air box onto the top of the heat exchanger, screws e

To Rebuild New Heat Exchanger

Reverse the above instructions placing all components onto new heat exchanger.

NOTE

ENSURE NEW `O` RINGS SUPPLIED WITH NEW HEAT EXCHANGER

ARE FITTED ONTO THE PIPE see drawing H `O` rings `B`