IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

12
3.6.2 Wiring Inside the Electric Control Box
For connections to the AHU control box : Pull the wires inside through the screw nut and fasten the nut firmly to ensure a good
pull relief and water protection.
The cables require an additional pull relief. Strap the cable with the installed tie wrap.
Note：
The connection with the terminal block must be secure. Failure to do so may result in heating due to poor contact, and even fire
in serious cases.
The power cable and the communication cable should be separated by at least 50 mm to prevent electromagnetic interference.
Connect the cables to the main board in accordance with the circuit diagram shown in Figure 3-14.
Figure 3-15
Connect cables in accordance with the following table.
EEV
T1
TA
T2A
T2
T2B
P, Q, E
X1, X2
D1, D2, E
X,Y,E
ON/OFF
cool
heat
fan
alarm
defrost
run
AUX
Cross
Section
(mm2)
Max.
Length
(m)
Specification
Electronic expansion valve
Inlet air temperature
Outlet air temperature
Heat exchanger inlet temperature
Heat exchanger intermediate temperature
Heat exchanger outlet temperature
Communication cable connected to ODU/MS
Wired controller
Wired controller (optional)
Comunicate with AHU control box
Remote on/off
Cooling signal
Heating signal
Fan status
Alarm signal
Defrosting/anti-cold wind signal
Operating Status
Electric auxiliary heater signal
Electronic expansion valve
AHU
AHU heat exchanger
AHU heat exchanger
AHU heat exchanger
AHU
ODU / MS
Factory controller
Factory controller
Master/slave AHU control box
Third party controller
Third party controller
Third party controller
Third party controller
Third party controller
Third party controller
Third party controller
Electric auxiliary heater
5
10
10
10
10
10
1200
200
1200
1200
0-12VDC
0-5VDC
0-5VDC
0-5VDC
0-5VDC
0-5VDC
0-5VDC
18VDC
0-5VDC
0-5VDC
0-12VDC
0-12VDC
0-12VDC
0-12VDC
0-24VDC/AC
0-24VDC/AC
0-24VDC/AC
0-12VDC
L, N
LOW/MID-
DLE/HIGH, N
Description Connected To
Power supply
Fan speed signal
Power supply
AHU fan
220-240V 1Ph
50/60hz
220-240V 1Ph
50/60hz
*
#
**
-
0.75
Table 3-10
*Refer to Cross section of main power cable
#Refer to Fan wiring
**The maximum length depends on the external device that is connected (controller, relay …).
-
-