IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 140819162

15
3.6 Signal Cable Connection
Note:
1. The rated current of the contactor must be greater
than the current of the motor.
2. The control power of the contactor must be the same
as the input power of the AHU control box.
3. SW1-2 must be set to "ON".
4. ENC2 must be dialled to "2".
5. The product do not include the breaker and contactor.
Note:
The connecting terminals of the water level switch are
connected by default. When connecting the AHU with the
drainage pump, remove the connecting wire and connect
to the water level switch.
X1 and X2 are ports for connecting to a standard wired
controller, while D1,D2 and E are ports for connecting to
the optional wired controller. For specific models, consult
the manufacturer's technical support personnel or a local
dealer.
If the fan motor is a 3-Phase AC motor, SW1-2 must be
set to "ON", and the ENC2 must be dialled to "2". The fan
terminal block only supports high-speed output. When
wiring the motor, refer to Figure 3-20.
The following figure displays the signal cable connection
diagram:
ON
1234
SW1
SW1, ENC2
Only high-speed is available
Figure 3-21
Figure 3-22
When a third party controller is used, communication
between the AHU control box and third party controller is
achieved via dry contacts. See the signal cable connec-
tion diagram below:
CN9CN32CN61
Vi+
Vi-
CN17
CN18
To master/slave
AHU control box
comm.bus
Remove the short-wire
and connect to the water
level switch if the drain-
age pump is available
P
Q
X
Y
Water
level
switch
CN10
To Outdoor/MS units
comm.bus
CN19
CN5
D1
D2
CN23
CN9
Y
X
X1
X2
To Wired Controller
(factory)
D1
D2
E
P
Q
E
E
E
To Wired Controller
(optional)
magnet
ring
E
E
Figure 3-20
fan
motor
3-phase AC motor
A1
A2
Contactor
Contactor control
External 3-Phase power
CN2 CN3 CN4
HIGH
N
L
N
molded case
circuit breaker
single-phase power
Alarm
The third party controller
Defrost
Run status
0-10V signal
Fan
status
Heat
mode
On/off
Cool
mode
CN62
WATER