12
221873B
BOILER
DOMESTIC
WATER
HOT
COLD SUPPLY
FILLING
POINT
OPTIONAL FILLING
KIT AVAILABLE
No. 457120
DRAIN
POINT
’A’
FLOW
CONTROL
VALVE
HEATING
CIRCUIT
RETURN
ADDITIONAL
EXPANSION
VESSEL
(if required)
Diagram 4.3
METHOD 1
METHOD 2
METHOD 3
SUPPLY STOP
VALVE
SUPPLY
PIPE
HOSE
UNIONS
SERVICING
VALVE
TEMPORARY
HOSE
HEATING
SYSTEM
HEATING
SYSTEM
TEMPORARY
HOSE
HOSE
UNIONS
SERVICING
VALVE
SUPPLY
PIPE
SUPPLY STOP
VALVE
DOUBLE CHECK
VALVE ASSEMBLY
HEATING
SYSTEM
SERVICING
VALVE
SUPPLY
STOP VALVE
SUPPLY
PIPE
HOSE
UNIONS
DOUBLE CHECK
VALVE ASSEMBLY
OVERFLOW
CISTERN
COMBINED
CHECK VALVE
AND VACUUM
BREAKER
PRESSURE
REDUCING
VALVE
3132
6951
Diagram 4.2
4 Heating System
5.1 General
The domestic hot water service must be in accordance with the
rules in force in the countries of destination.
5.2 Water Pressure
For the minimum and maximum working pressures of the
domestic hot water circuit of the boiler refer to diagram 1.2.
If the cold water supply pressure exceeds the maximum, a
governor must be fitted in the supply to the boiler to reduce the
pressure to within the limits given.
ALTERNATIVE METHODS OF FILLING
5.3 “Hard” Water Areas
In areas where the water is “hard”, more than 200mg/litre, it is
recommended that a proprietary scale reducer is fitted in the
cold water supply to the boiler. Consult the local water company
for additional advice.
A double check valve assembly must be fitted upstream of the
scale reducer. For the relative position of the scale reducer and
pressure reducing valve, if required, refer to the manufacturer’s
instructions.
5 Domestic Hot Water System
