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Quick Reference Guide - Page 16
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. The AC230 V 1 A output
from the Hydro Unit must only be used to energize an external contactor (Supplied locally).
• 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 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 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 (see diagram below):-
Electrical connection for external additional pump (P2)
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. The AC230 V 1 A output
from the Hydro Unit must only be used to energize an external contactor (Supplied locally).
• The Hydro Unit has the facility to connect an additional circulating pump, if required, into the
heating or cooling system.
• Install the external pump so that its motive power does not affect the internal pump.
• The output for the pump is synchronized with the operation of the main circulating pump (P1)
inside the Hydro Unit.
• Connect the coil, of the field supply contactor, to terminals 1 & 2 on Terminal Block 05.
• A separate dedicated electrical supply must be used for the additional pump. This must be
connected through the contacts on the field supplied contactor (see diagram below):-