73
DhW pLATE hEAT ExChANgER REpLACEMENT
74
pUMp hEAD REpLACEMENT
75
Ch WATER pREssURE sENsOR REpLACEMENT
1. Refer to Frames 45 & 46.
2. Refer to Frame 53.
3. Close the isolating service valves and drain the heating
and DHW systems. Refer to Frame 67.
4. Remove the burner & Fan assembly. Refer to Frame 47.
5. Remove the 2 Allen screws securing the plate heat
exchanger to the brass housings.
6. Ease the plate heat exchanger back to disengage and
lift out.
7. Fit the new heat exchanger using the new o rings
supplied.
8. Ret in reverse order.
9. Open the isolating service valves, rell the CH and DHW
systems and vent as necessary. Refer to Frame 67.
10. Check the operation of the boiler. Refer to Frames
33-36.
1. Refer to Frames 45 & 46.
2. Refer to Frame 53.
3. Close the isolating service valves and
drain the (CH) boiler. Refer to Frame
67.
4. Disconnect both electrical leads to the
pump
5. Remove the 4 Allen screws securing the
pump head and remove.
6. Ret in reverse order.
7. Open the isolating valves and rell the
CH system. Refer to Frame 67.
8. Check the operation of the boiler. Refer
to Frames 33-36.
1. Refer to Frames 45 & 46.
2. Refer to Frame 53.
3. Close the isolating service valves and
drain the (CH) boiler. Refer to Frame 67.
4. Remove the retaining clip to the rear of the
housing.
5. Lift out the sensor and disconnect the
electrical connection.
6. Ret in reverse order.
7. Open the isolating valves and rell the CH
system. Refer to Frame 67.
8. Check the operation of the boiler. Refer to
Frames 33-36.
4
5
4
sERVICINg
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