69
PUMP HEAD REPLACEMENT
70
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 (CH) boiler. Refer to Frame
65.
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 65.
8. Check the operation of the boiler. Refer
to Frames 32-35.
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 65.
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 65.
8. Check the operation of the boiler. Refer to
Frames 32-35.
4
5
4
71
FLOW THERMISTOR REPLACEMENT
1. Refer to Frames 45 & 46.
2. Refer to Frame 53.
3. Unclip the ow thermistor.
4. Disconnect the electrical lead from the thermistor.
5. Reconnect the electrical lead to the new thermistor and
reassemble in reverse order, ensuring that the thermistor
is securely tted to the pipe on the thermistor locator tabs
as shown.
6. Check the operation of the boiler. Refer to Frames 32-35.
3
4
SERVICING