Installation; General - Heatrae Sadia R 45 PLUS 3KW Installation, Operation And Maintenance Manual

6. Installation

6.1 General

After reading sections 1 - 5 in this booklet please
install the unit paying attention to the following water
connection, electrical and commissioning sections.
6.1.1 Siting of the unit
These water heaters are vented and can supply
multiple hot water outlets. The units must be mounted
higher than the taps they supply, refer to figure 7 below,
due to gravity supplied hot water.
Ideally the heater should be fitted close to the point where
hot water is required. In order to present the minimum
resistance to flow we recommend that the outlet pipe
work be 22mm for as much of its length as possible.
Sufficient space around the water heater must be
provided for both installation and servicing, refer to
figure 6, page 12 for the clearance dimensions.
Figure 7: Example of typical installation (not to scale)
Overflow to safe and
suitable location
The unit must be a minimum of 1.2m
above highest outlet
Hot outlet
6.1.2 Water Connections
The unit is supplied with the following connections:
Cold water inlet – 15mm push fit connector
`
Hot water outlet – 22mm open end pipe
`
Breather pipe - 22mm open end pipe (Initial
`
Breather Pipe with tundish supplied in kit)
A full bore isolating valve must be inserted into the
15mm cold water inlet pipe work as close as is practical
to the water heater, this is to aid both the installation
and servicing of the unit during its service life.
WARNING
If the unit is being installed for a hand wash
only requirement then it is must be fitted with
an appropriate low pressure blending valve
on the hot pipe work, close to the point of use
outlet. These available through the supply
partners found on the back page. This will allow
the water in the heater to be stored at a higher
temperature, water stored above 60°C not only
gives more useable blended hot water output,
it also considerably reduces the possibility of
harbouring bacteria
Thermostatic blending valve CT1
Pressure reducing valve CT2
Service valve (needs to be full bore)
Cold feed
13