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6.2 Water connections
PLUMBING - CISTERN FED
This method of installation is to be used at all
�
times when the outlet is connected to one or
more conventional taps. It is not recommended
for suppling a shower. Individual site demands
should be considered when choosing the number
of outlets to be served.
A vent pipe must be connected to the outlet
�
connection of the heater.
The vent pipe must have a minimum internal
�
diameter of 19mm.
The vent pipe must be unobstructed, rise
�
continuously and be arranged to discharge over
the cold water feed cistern. DO NOT connect any
pressure relief device to the vent pipe of this water
heater.
The cold water supply must be from a cold water
�
feed cistern complying with Byelaw 30. The
maximum head pressure must not exceed 20
metres (Water Regulations Schedule 2, section 7,
paragraph 16).
It is recommended that an WRC Listed isolating
�
valve is fitted on the cold water supply to the heater.
A drain cock should be fitted on the inlet pipe to the
heater at a level lower than the appliance to allow
draining for maintenance.
The inlet must not be connected directly to the cold
�
water mains supply.
The Vent Pipe should be connected to the top of
�
the heater using a 1/2" BSP connection.
MINIMUM HEAD
4 METERS
Figure 8: Typical cistern fed installation
CISTERN TANK
VENT
PIPE
ISOLATING
VALVE
DRAIN
COCK
MAXIMUM HEAD
20 METERS
11
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