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

10. If branching the inter-unit control wiring, the number of branch points should be 16 or
fewer. (Branches that are less than 1m are not included in the total branch number.)
Branch
point
16 or fewer
11. In case of a multiple MAH2 generation 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 external
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.
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, in order to prevent the heat exchanger coil from freezing up due to insufficient
air volume flow.
AHU Kit – Installation Instructions – 09/2021
Outdoor unit
Indoor unit Indoor unit
more than 1 m
Indoor unit Indoor unit
more than 1 m
Indoor unit
more than 1 m
Indoor unit
5.6 Connection of external signal lines, p.
Outdoor unit
Indoor unit
Indoor unit
Electrical Wiring
Outdoor unit
Indoor unit
Indoor unit
5
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