When planning the plumbing requirements for the heater, it is strongly advised a service
valve be fitted nearby to facilitate future maintenance.
The inlet (blue) and outlet (red) connections are not interchangeable, it is essential that
the incoming water supply is connected to the blue side and the red side is connected
to the outlet (tap).
Both the inlet and outlet connections should be made using ½” female connections.
For the best results, a fitting with a shallow thread depth is recommended. This will
facilitate a good flush fit against the heater connections that will seal reliably when
using a rubber washer of the right size.
Upon completion of all plumbing connections, open the outlet (tap) and then turn on
the water supply to allow the unit to purge air and fill. When water runs smoothly from
the outlet (tap), close it and then inspect all connections for leaks.
All installations require that the pressure relief valve (supplied) be fitted.
When fitting it, ensure that there is a clear pathway (i.e. no check valves or
non-return device) from the inlet of the heater right back to the device.
Ensure the pressure relief valve discharges to safe visible place and an air gap
is maintained.
Failure to ensure the correct installation of the pressure relief valve may result
in a dangerous build of pressure which can cause damage to the heater,
fittings and surroundings. If in doubt contact a suitably qualified tradesman
or alternatively speak to the technical team at Hyco about this, or any other
question regarding the heater and its installation.
6
Pressure
relief valve
T piece
To drain
Service valve
Cold water mains
Ensure the pressure relief valve
is fitted and there are no fittings
between it and the heater.
M
