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Cold water
from Mains
Expansion Relief
Valve
Figure 4: Detail showing the connection of the expansion
vessel to the inlet group
6.2.3 Balanced Cold Water Supply
If balanced cold water supply is required a connection
can be taken from the bottom of the inlet group.
6.2.4 Drain Valve
It is also recommended to install a drain valve (not
supplied) in the lowest point of the cold water feed to
the water heater. This allows the water heater to be
drained in a controlled manner should this become
necessary.
6.3
Hot Water Outlet
The hot water pipework is to be directly connected to
the hot water outlet connection on the water heater.
6.3.1 Thermostatic Mixing Valve
A thermostatic mixing valve may be required to limit
the outlet temperature. In this case, the valve should
be installed following the manufacturer's instructions,
ensuring none of the safety equipment has been
isolated, (i.e. make sure the connection to the
thermostatic mixing valve is taken after the safety
equipment of the inlet group).
6.3.2 Pipe Insulation
It is recommended to insulate the hot water pipework
from the water heater to the outlets, to reduce the
energy requirements for providing hot water. It is also
recommended to insulate all other exposed pipework,
such as the T&P to the tundish, the coil flow and return
and the cold water inlet pipes.
6.4
Discharge Pipes from Safety
Devices
6.4.1 Discharge Pipe D1
The temperature and pressure relief valve must be
discharged directly or by way of a manifold via a short
length of metal pipe (D1) into a tundish; and the
discharge pipe must be installed in a continuously
downward direction and in a frost free environment.
Water may drip from the discharge pipe of the
pressure relief device and this pipe must be left open to
the atmosphere.
The diameter of discharge pipe (D1) should not be less
than the nominal outlet size of the safety device, e.g.
temperature relief valve.
Balanced Cold
Water Supply
Expansion Vessel
Connection
Cold Water Inlet
Installation
Where a manifold is used it should be sized to accept
and discharge the total discharge from all the D1
discharge pipes connected to it.
The discharge pipework from the expansion relief valve
must be installed constantly falling to an open point of
discharge. It is recommended to combine it with the
discharge of the temperature and pressure relief valve.
Note: The T&P valve is pre-sealed and if moved the
seal will be broken, should this occur, it will need to
be resealed with an appropriate sealant (Dimplex part
number R00836-1).
6.4.2 Discharge Pipe D2
For a detailed description of the discharge pipework D2
(see Section 5.8.1).
6.4.3 Tundish
The tundish should be vertical, located in the same
space as the unvented hot water storage system and be
fitted as close as possible to, and lower than, the safety
device, with no more than 600mm of pipe between the
valve outlet and the tundish (see Figure 2).
Where discharge may not be apparent, e.g. in dwellings
occupied by people with impaired vision or mobility,
consideration should be given to the installation of a
suitable safety device to warn when discharge takes
place, e.g. electronically operated.
Note: To comply with the Water Supply (Water Fittings)
Regulations, the tundish should incorporate a suitable
air gap.
Note: It is important that the tundish is
positioned away from any electrical components.
6.5
Immersion Heater
The Edel Air Source Heat Pump Water Heater comes
with the immersion heater factory fitted and wired. The
immersion heater incorporates an independent non-self
resetting over temperature cut-out. Should this
operate, please investigate the cause of the cut out
before resetting (See Troubleshooting).
The water heater must be filled with water
before switching on the immersion heater. Failure
!
to do so will damage the element and void any
guarantee on the product.
Figure 5: Wiring diagram for Immersion Heater
Dial to adjust
water temperature
Earth (green/yellow)
Live (brown)
Neutral (blue)
9
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