WARNING:
Do not operate the boiler without a front
panel fitted
3.2 REMOVAL / REPLACEMENT OF COMPONENTS
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)
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
3.11
,
3.14
,
3.17
,
3.20
-
3.31
, it is necessary to drain the boiler.
Refer to Section
3.3
39
Installation and Servicing
Section 3 - Servicing
SER
VICING
Refer to Section
3.2
75
61
36
21
33
32
43.5
94
CH
Flow
DHW
Outlet
Gas
DHW
Inlet
CH
Return
CH
Circuit
Drain
3.3 DRAINING THE BOILER
DOMESTIC HOT WATER CIRCUIT
1. Close all the DHW water isolating valves on the boiler
inlet.
2. 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 released during replacement
of components.
3. After replacing any component on the boiler, open
isolating valves.
4. Check that the boiler operates in both DHW & CH modes.
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 by reconnecting the filling loop, check for
leaks before proceeding to check operation of the boiler.
5. Disconnect filling loop.
Refer to Section
2.18
