BOILER REPLACEMENT: OPTIMAX 25C TO MODENA 32C HE
9.
Remove the condensate bowl and hose from the
boiler fittings pack. Undo plastic nut (Fig.9-A) and fit
the condensate bowl and washer. Push on the
rubber condensate hose to the trap outlet (Fig.9-B).
10. Connect the safety valve outlet (Fig.9-C) to the
existing 15mm discharge pipe and then connect the
existing condensate pipe to the rubber hose outlet.
Check that both terminate in accordance with – BS
6798.
Take care not to interfere with the new routes for gas,
water and heating pipe connections
11. Fit the valve kit to the connections on the
underside of the boiler using the washers
provided (Fig 10) and reconnect to the existing
pipe-work.
12.
Connect the temporary filling loop between
the cold water inlet and the C H return pipe
as close to the boiler as is practical (Fig.11)
Open the CH isolation valves; fill and vent
the system and flush using a commissioning
cleanser. During final filling add a suitable
corrosion inhibitor as per BS 7593.
Check for leaks
A
CH FLOW
B
HOT WATER OUTLET
C
GAS
D COLD WATER INLET
F
CH RETURN
Fig 10
Fig.9
A
B
C
Condensate bowl,
washer and rubber
hose connection
Fig.11
CH
HW GAS COLD CH
FLOW OUTLET
WATER RETURN
Temporary filling
loop between
cold inlet &
heating return