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MAH3 generation models
For PAW-160/280/560MAH3M, there are several possibilities for making a connection between the
AHU system and an external building management system.
You can either use the terminal contacts T10.1 and T10.2 on the main PCB, or you may purchase
the PAW-T10 PCB as a field-supplied optional part and connect it as per the following diagram,
which shows just one wiring example of several possibilities.
For the main PCB terminals T10.1/T10.2 or the PAW-T10 PCB terminals No. 1 and 2 used in this
wiring system to work properly, the following requirements must be observed:
● On the AHU Kits's integrated remote controller, invoke the "Detailed Settings" mode
and set parameter "2E" to "0001". (For details on the "Detailed Settings" mode, see
the operating instructions of the relevant remote controller model or the ECOi/ECO G
service manuals.)
● Make sure that jumper JP1 on the indoor unit PCB remains closed/intact.
As an alternative to using either the main PCB contacts T10.1/T10.2 or the PAW-T10 PCB contacts
No. 1 and 2, it is also possible to use for example terminal contacts X6.7 to X6.10 in Section X6 of
the main PCB ("COM" and "DI1" to "DI3"). For correct use of these contacts see →
board layout, p.
The wiring system shown in below diagram provides the following control functions:
● During the first 3 minutes after unit has been switched to "ON" (either by BMS or by
local remote controller), the delay timer relay will keep the PAW-T10 contacts closed
and operation is permitted.
● After the AHU fan has been started and while the air volume flow is sufficient, the air
flow switch will keep the PAW-T10 contacts closed so that operation continues.
● Once the set delay time has elapsed, the timer contact will be opened, but the
PAW-T10 contacts will stay closed due to the air flow switch relay.
● When the air volume flow drops below the lower limit, the air flow switch will open
the PAW-T10 contacts and the outdoor unit will stop operation. At the same time the
remote controller in the AHU unit will be locked to prevent unintentional operation.
● The minimum air volume flow should be set on the air flow switch according to the
required minimum air volume flow of each AHU Kit model.
AHU Kit – Installation Instructions – 07/2023
55.
Electrical Wiring
5.3 Terminal
5
77
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