10
221051B
10
SECTION
Water Systems (Sealed)
2
Pressure Gauge
A pressure gauge with a set pointer and
covering at least 0 to 4bar (0 to 60lb in
2
)
shall be fitted permanently to the system
in a position where it can be seen when
filling the system.
Domestic Hot Water
Cylinder
SINGLE FEED INDIRECT
CYLINDERS ARE NOT SUITABLE
The hot water cylinder must be of the
indirect coil type. It must be suitable for
working at a gauge pressure of 0.35bar
above the safety valve setting.
UNVENTED
Where a storage system will not have a
vent to atmosphere the installation must
comply with the Building Regulations and
any local Water Company Bylaws, see
also the current issue of BS5446 and
BS6700.
If fitting into an existing system the local
authority must be informed.
Water Make Up
Provision should be made for replacing
water loss from the system using a make
up bottle mounted in a position higher
than the top point of the system,
connected through a non-return valve to
the return side of either the heating circuit
of the hot water cylinder.
Alternatively, provision for make up can
be made by pre-pressurisation of the
circuit.
Filling Sealed Systems
Provision for filling the system at low
level must be made. Three methods are
shown in the diagram. There must be no
permanent connection to the mains water
supply, even through a non-return valve.
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
0051M
