Heatrae Sadia Express 50 Litres, Installation, Operation And Maintenance Manual

Page: 11 / 24

11
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.
DRAIN
COCK
VENT
PIPE
CISTERN TANK
ISOLATING
VALVE
MINIMUM HEAD
4 METERS
MAXIMUM HEAD
20 METERS
Figure 8: Typical cistern fed installation