32
2000225065A
Diagram 12.10
9184
Diagram 12.11
9302
DRAIN POINT
DRAIN
VALVE
GAS SERVICE
COCK
MOUNTING JIG
MOUNTING JIG
CENTRAL
HEATING FILTER
RETAINING CLIP
HOUSING
12 Servicing
Diagram 12.12
10063
SEAL
FRONT
CASING
PANEL
FLAT
AND
HOLE
INNER
CASING
PANEL
9808
REAR PANEL
TORX
SCREWS (3)
CONTROL BOX
RETAINING
CORD
RETAINING
SLOTS
Diagram 12.13
12.9 Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing the
heating flow and return isolating valves on the wall mounting jig,
see diagram 8.1.
Attach a length of hose to the drain point and open the drain
valve, see diagram 12.11.
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
section 11.2.
Check for leaks.
12.10 Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve on the wall mounting jig.
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.
12.11 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 12.12.
