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Electrical Wiring
Electric circuit example – ECOi systems
Multi-connection systems with 3 AHU Kits
5
Electric circuit example – PACi systems
Single-connection system
Method B: For multi-step or inverter mode fan control by external BMS
When the AHU fan is controlled by an external building management system in a multi-step or
inverter mode (e.g. based on a room CO
the simple on/off contact method (as in Method A) may not be satisfactory. In such cases, it is
strongly recommended to install a field-supplied differential pressure switch and/or air flow switch
in the AHU duct(s), in order to enable outdoor unit operation only when sufficient air volume flow is
present.
PAH3 generation model
For PAW-280PAH3M-1, you can use the terminal contacts T10.1 and T10.2 on the main PCB to
make a connection between the AHU system and an external building management system. For
correct use of these contacts see →
76
AHU Kit
K2
OP3
F2
Blower signal
output
F1
AHU Kit
K2
OP3
F2
Blower signal
output
F1
AHU Kit
K2
OP3
F2
Blower signal
output
F1
AHU Kit
Blower signal
F2
output
F1
Field-supplied
X4
X1
X1
X4
X2
X4
X4
Field-supplied
X1
Blower
X1
signal
sensor or a room supply pressure control or similar),
2
5.3 Terminal board layout, p.
X2
X3
Blower
signal
55.
AHU Kit – Installation Instructions – 07/2023
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