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Electrical connection for external booster heater
CAUTION
• The maximum current available from the booster heater output is 1 A. Do not connect the
booster heater directly to Terminal Block 05 on the Hydro Unit. A separate contactor,
supplied locally, must be used to supply the booster heater.
• The booster heater can be installed only for room heating and cannot be used for hot water
supply.
• Install the booster heater downstream of the 3-way valve on the indoor unit side.
• The booster heater is an external heater, supplied locally, used to assist the Hydro Unit during
low ambient conditions.
• The AC230 V 1 A output from the Hydro Unit must only be used to energize an external contactor
(supplied locally).
• The output from the Hydro Unit is only enabled when either the outdoor air temperature to be
lower than -20°C.
• Ensure the external booster heater is installed and set up in accordance with all Local, National
and International regulations.
• Connect the external booster heater to the Hydro Unit
according to the diagram shown opposite:-
• The contactor will energize in the event of low ambient
conditions.
• A separate dedicated electrical supply must be used for
the external booster heater. This must be connected
through the contacts on the field supplied contactor.
Electrical connection for external additional pumps
CAUTION
• The maximum current available from the additional pump output is 1 A. Do not connect
the additional pump directly to Terminal Block 05 on the Hydro Unit. A separate contactor,
supplied locally, must be used to supply the additional pump.
• The Hydro Unit has the facility to connect an additional circulating pump, if required, into the
heating or cooling system.
• Install the pump so that its motive power does not affect the internal pump.
• The AC230 V 1 A output from the Hydro Unit must only be used to energize an external contactor
(supplied locally).
• The output for the pump is synchronized with the operation of the main circulating pump (P1)
inside the Hydro Unit.
• Ensure the pump is installed and set up in accordance with all Local, National and International
regulations.
• Connect the additional pump (P2) as shown in
the diagram opposite:-
• The contactor will energize synchronously with
operation of the main circulation pump (P1).
• A separate dedicated electrical supply must be
used for the pump. This must be connected
through the contacts on the field supplied
contactor.
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