1. Refer to Frame 40.
2. Drain the heating system. Refer to Frame 55.
3. Unscrew the pressure gauge and discard.
4. Fit new pressure gauge, using suitable jointing
compound.
5. Rell the boiler.
6. Check operation of the boiler. Refer to Frames
29 & 30.
56
PRESSURE GAUGE RENEWAL
55
DRAINING THE BOILER
DOMESTIC HOT WATER CIRCUIT
1. Refer to Frame 40.
2. Close the DHW water isolating valve on the boiler inlet.
3. To drain the domestic hot water circuit: As there is no direct drain for the domestic hot water circuit, depending on the
location of the boiler, opening the lowest hot water tap may drain this circuit. However it must be noted that some residual
water will be experienced during replacement of components.
4. After replacing any component on the boiler, close tap, close the drain valve and open all system isolating valves (re-
pressurise as appropriate)
5. Check operation of the boiler. Refer to Frames 29 & 30.
CENTRAL HEATING CIRCUIT
1. Refer to Frame 40.
2. Close all the CH water isolating valves on the boiler inlet.
3. To drain the primary heat exchanger circuit: Open the drain
valve and attach a length of hose to the CH drain point.
4. After replacing any component on the boiler, remove the hose,
close the drain valve and open all system isolating valves (re-
pressurise as appropriate).
5. Check operation of the boiler. Refer to Frames 29 & 30.
54
DHW FLOW TURBINE SENSOR REPLACEMENT
1. Refer to Frame 40.
2. Drain the DHW system. Refer to Frame 55.
3. Pull off the electrical connection.
4. Using a suitable tool, lift and remove the
retaining clip.
5. Use the clip to ease the turbine sensor from its
housing.
6. Re-assemble in reverse order.
7. Check operation of the boiler. Refer to Frame
29 & 30.
4
3
5
SERVICING
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