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3.2
REMOVAL / REPLACEMENT OF COMPONENTS
WARNING:
Do not operate the boiler without a
front panel fitted
When replacing any component.
1. Isolate the electricity supply.
2. Turn off the gas supply.
3. Remove the boiler front panel.
Refer to Section
3.4
4. Swing the control box down into its servicing position.
After removing / replacing any component.
5. Ensure all gas valve connections are gas tight with a gas
soundness check up to the gas control valve.
6. Ensure all water connections are tight.
7. Test the appliance for correct and safe operation.
Refer to Section
3.1
(General)
3.3
DRAINING THE BOILER
Refer to Section
3.2
CENTRAL HEATING CIRCUIT
1. Close all the CH water isolating valves on both the flow
and return.
2. To drain the primary heat exchanger circuit: Open the
drain valve and attach a length of hose to the CH drain
point.
3. After replacing any component on the boiler, remove the
hose, close the drain valve and open all system isolating
valves.
4. Repressurise before proceeding to check operation of the
boiler.
5 Disconnect filling loop.
Refer to Section
2.17
6. Check that the boiler operates.
36
Section 3 - Servicing
Notes.
1. In order to assist fault finding, the control panel has an
LCD diagnostic display. The key to boiler fault conditions
is shown in Section 4.
2. In order to replace components in Sections 3.13, 3.17-
3.18 and 3.20-3.24, it is necessary to drain the boiler.
Refer to Section
3.3
PRV
Grommet
CH
Flow
Cond.
Drain
Gas
CH
Return
Installation and Servicing
CH
Circuit
Drain
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