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Installation
HP Installatio
n and User Instructions R00918
-10 09/15
Page
22
4.4 Immersion heater
The immersion heater has to be
connected in accordance with IEE
Wiring Regulations and the installer
carrying out the work has to be suitably
qualified. It must be connected
through a double pole isolating switch
or suitable controller which must have
a contact separation of at least 3mm in
all poles. The wiring diagram can be
seen in Figure 6. For further details
please see instructions provided with
the immersion heater.
The immersion heater incorporates an
independent non-self resetting over
temperature cut-out. Should the over
temperature cut-out operate, the reset
pin will be pushed upwards, and
become level or slightly proud of the
cover at the position marked “Safety”.
Use a suitable sized implement to reset
the pin by pushing it hard into its
original position.
The immersion heater typically cannot
be directly switched by the heat pump
controller, but instead requires a relay.
Note: Should it be necessary to
remove the thermostat from the
immersion element, ensure that
the contacts are re-fitted correctly
into the positions on the element.
Failure to do so carries the risk of
overheating the contacts and thus
damaging the appliance.
Note: The immersion heater
thermostat should not be removed
from the immersion heater body.
A torque of 40 Nm is recommended
when tightening up the immersion
after it has been removed and refitted.
The immersion heater thermostat must
not be opened under any
circumstances.
Note: The cylinder 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.
4.5 Coil flow connections
If the flow connection is the highest
point in the heat pump loop and if the
system was not commissioned using a
flush and fill pump, an adequate device
for de-aeration must be installed.
4.6 Coil return connections
Equally, if the return connection is the
lowest point in the heat pump loop, a
suitable drain device should be
installed. For location of connections
see Figure 1.
It is recommended that the fittings
used to connect to the cylinder are
suitable for stainless steel, the flow and
return should use 28mm compression
fittings. Not all push fit fittings can be
used – please check with your supplier.
When using compression fittings,
ensure that the connection is not over-
tightened.
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