IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

11
3.6.1 Circuit Diagram
Please refer to the circuit diagram for wiring.
Circuit diagram
Figure 3-14Specifications are subject to change without notice.
CN2 CN3 CN4 CN1
CN17
ENC1 ENC2 ENC3 ENC4
Alarm
0-10V input
Vo+
XP12
XS12
XS1 XP1
XS11
P
Q
XP11
XS2
XP2
XS3
XP3
XS5
XP5
XS7
XP7
XS8
XP8
XS6
XP6
XS4
XP4
Main board
C1
3 42
1
ON
3 42
1
ON
3 42
1
ON
3 42
1
ON
2
1
ON
32
1
ON
D1
D2
C2
C1
X2
D1
D2
Vo-
Vi+ Vi-
XS9
XP9
XS10
XP10
CN18
EEV
Defrost
Run
COM
E
P
Q
E
E E
E
C2
E
X1
fan motor
Single-phase AC motor
Y/G
Y/G
MIDDLE
AUX
WATER
Third party
controller
0-10V output
ON/OFF
Fan status
Heat mode Cool mode
ON/OFF switch
COOL
HEAT
COM
FAN
POWER LOW MIDDLE HIGH
CN12
220-240VAC 50/60Hz Power in
Heater control output
L N
LOW
HIGH
N
Pump control output
Third party controller
CN15
CN20
CN8
L’ N’
To wired controller (optional)
To wired controller (factory)
To Outdoor/MS units comm.bus
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
Water level switch
SW1 SW2 SW3 SW4 SW9 SW10
CN21
CN22
CN16 CN7
CN62 CN61 CN32 CN9 CN23 CN5 CN19 CN10
T2B
T1
T2
T2A
TA
T2B
T1 T2
T2A
TA
RED
WHITE
BLACK
BLUE
YELLOW
Magnet
ring
Display board
CN35 CN11
CN30
M-smart
CN25
CN26
CN31
CN33