–24–
Hydro Unit
Installation Manual
EN
Electrical connection for external booster
heater
• 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
the outdoor air temperature is less 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 in accordance with the diagram shown below.
• Connect the coil, of the field supplied contactor, to
terminals 5 & 6 on Terminal Block 05. 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.
▼ Fig. 7-23
Electrical connection for external additional
pumps
• The Hydro Unit has the facility to connect an
additional circulating pump, if required, into the
heating or cooling system.
• There is an output available from the Hydro Unit.
AC230 V 1 A (maximum) is available from each
output. The output for each additional pump is
synchronized with the operation of the main
circulating pump inside the Hydro Unit.
• Connect the additional pumps as shown in the
diagram below.
• Connect external pump 1 to terminals 1 & 2 on
Terminal Block 05.
• Install external pumps so that their motive power
does not affect the internal pump.
▼ Fig. 7-24
Terminal Block 05
Booster Heater
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24-EN
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