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13.9 Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing the
heating flow and return isolating valves, see diagram 9.1.
Refer to diagram 13.12.
Attach a length of hose to the drain point and open the drain
valve.
After servicing or replacing parts, close the drain valve and
remove the hose. Open the heating flow and return isolating
valves and refill, vent and pressurise the heating circuit. See
relevant parts of section 12.
Check for leaks.
13.10 (F28e ONLY) Draining of Boiler Hot
Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve, see diagram 9.1.
Open one or more hot water taps to drain the hot water circuit.
After servicing or replacing parts open the cold-water isolation
valve and slowly open a hot water tap to remove air. Close the
hot water tap and check for any leaks.
13.11 Inner Casing Panel Seal Check.
Check the condition of the seal, replace as required.
To replace remove the old seal, thoroughly clean the casing
sufaces. Fit the new seal, it is supplied to the correct length, see
diagram 13.13.
13.12 Heat exchanger
Only clean the heat exchanger if the the measured CO
be adjusted to the figure specified in section 13.6.
Remove the gas supply pipe securing clips. Carefully push the
pipe up and turn to the left and down to remove.
Remove the burner and fan, see section 13.4.
Using a soft brush clean the inside of the heat exchanger
Do not use a wire brush or tools likely to damage the heat
exchanger.
Check the CO
value adjust as required, refer to section 13.6.
2
13 Servicing
DRAIN
VALVE
FRONT
CASING
PANEL
INNER
cannot
CASING
2
PANEL
41
DRAIN POINT
Diagram 13.12
SEAL
Diagram 13.13
2000225242A
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