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Figure 3: Connection of the expansion vessel
to the inlet group
Note: The expansion vessel must be installed
to the side of the expansion relief valve on
the inlet group. To do this the blanking plug
must be removed and the expansion vessel
connected, as shown in Figure 4.
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.
Balanced Cold
Water Supply
Expansion Vessel
Connection
Cold Water Inlet
Installation
6.4
Discharge Pipes from Safety
Devices
6.4.1 Discharge Pipe D1
The temperature and pressure relief valve must be dis-
charged 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 down-
ward 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. tem-
perature relief valve.
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 dis-
charge 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 re-
sealed 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 out-
let and the tundish (see Figure 2).
Where discharge may not be apparent, e.g. in dwellings
occupied by people with impaired vision or mobility, con-
sideration should be given to the installation of a suita-
ble 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 immer-
sion 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).
9
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