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11. In case of a multiple AHU Kit combination within one refrigerant system, those kits
must share the same AHU housing including fan, and they have to be "group-wired"
and operate as a single group. In this case you must only have one remote controller
and one CZ-CAPBC2 board (ACC-SP1A PCB) connected in one AHU kit. It is
irrelevant which one is retained, there is no preference. The external connections need
to be done only on the unit with the connected CZ-CAPBC2 board.
ATTENTION
!
Loose wiring may cause overheating of terminals resulting in unit malfunction or fire
Loose wiring may cause the terminal to overheat resulting in unit malfunction or a fire hazard.
► When connecting each power wire to the terminal, follow the instructions on how to
connect wiring to the terminal (see →
and fasten the wire securely with the terminal screw.
► Check and ensure that all wiring is tightly connected.
5.6
Connection of external signal lines
ATTENTION
!
Insufficient airflow may result in heat exchanger coil to freeze up
In systems using an AHU Kit, situations may occur where the outdoor unit is operating while the
AHU fan is not. This may lead to insufficient air volume flow, causing the heat exchanger coil to
freeze up and result in further damage to the system.
► Connect the external signal lines in such a way that enable the outdoor unit operation
only while the AHU fan is operating to safeguard sufficient air volume flow.
Depending on how AHU fan control is performed, there are several possibilities for connecting
the external signal lines, to prevent the heat exchanger coil from freezing up due to insufficient air
volume flow.
Two suitable methods will be explained in the following sections. All wiring diagrams are just exam-
ples. It is not necessary to build the electric circuit with 230 V AC. Any other suitable lower voltage
being available on site may be used as well.
Method A: For standard fan control
For systems with standard fan control, the external signal lines can simply be connected to the
contacts provided by the AHU Kit. The following installation requirements must be observed.
AHU Kit – Installation Instructions – 07/2023
5.6 Connection of external signal lines, p.
Electrical Wiring
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