Connection Of External Signal Lines - Panasonic PAW-160MAH2L Installation Instructions Manual

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 have to disconnect the
included remote controllers and CZ-CAPBC2 boards (ACC-SP1A PCB) except for
one each. It is irrelevant which one is retained, there is no preference. The exter-
nal connections need to be done only on the unit with the connected CZ-CAPBC2
board.
Note: In this particular case it is even possible to combine a single advanced or
medium version with one or two light versions, and still have full functions of the
advanced or medium version respectively.
!
NOTICE
Overheating of terminals with resulting unit malfunction or even fi re due to loose wiring
Loose wiring may cause the terminal to overheat resulting in unit malfunction or a fi re hazard.
► When connecting each power wire to the terminal, follow the instructions on how to
connect wiring to the terminal (see next section) and fasten the wire securely with the
terminal screw.
► Check and ensure that all wiring is tightly connected.
5.7

Connection of external signal lines

!
NOTICE
Freeze-up of the heat exchanger coil due to insuffi cient air volume fl ow
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 insuffi cient air volume fl ow, causing the heat exchanger coil to
freeze up and entailing further damage to the system.
► Connect the external signal lines in such a way that enables outdoor unit operation
only while the AHU fan is operating to safeguard suffi cient air volume fl ow.
Depending on how AHU fan control is performed, there are several possibilities for connecting
the external signal lines, in order to prevent the heat exchanger coil from freezing up due to
insuffi cient air volume fl ow.
Two suitable methods will be explained in the following sections. All wiring diagrams are just
examples. 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.
Electrical Wiring
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