IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 140819162

20
The definition of signals between the
third party controller and AHU control
box.
1. Signals from the third party controller to the AHU
control box.
Table 4-3
Table 4-4
Signal
Capacity
set
Signal
Type
Specification Port
0-10V
input
Close: ON
Disconnect: OFF
Close: fan ON
Disconnect: fan OFF
Close: cool mode
Disconnect: no cool signal
Close: heat mode
Disconnect: no heat signal
0-10VDC
Analog
voltage
ON/OFF ON/OFF
Dry
contact
Cool
mode
COOL
Dry
contact
Heat
mode
HEAT
Dry
contact
Fan
status
FAN
Dry
contact
Signal
Alarm
Signal
Type
Specification Port
Alarm
Close: defrosting
Disconnect: no defrost
Close: running
Disconnect: off
Close: alarm
Disconnect: no alarm
Dry
contact
Defrost Defrost
Dry
contact
Run
status
Run
Dry
contact
Note:
(1) The analog voltage must be between the maximum
and the minimum value.
(2) Don’t close the heat mode contact and cool mode
contact at the same time if it needs to run the AHU
control box.
2. Signals from the AHU control box to the third party
controller.
Note:
All signals between the third party controller and AHU
control box must be in accordance with the definition
specified in Table 4-3 and Table 4-4. It will not work
correctly if the definition of the signal in the third party
controller is not correct.
Operation at 0-10V capacity output
This control mode requires a third party controller
equipped with a temperature sensor that is used to
control the following temperatures:
1. Return air temperature of the AHU
2. Outlet air temperature of the AHU
The AHU control box will interpret the 0–10 V signal
according to 10 steps. The correlation between the
voltage output and the system capacity is shown in the
table below.
Capacity setting requiment table(same in heating and
cooling)
Operation instruction
When the third party controller has been selected, AHU
control box will operate according to the control signal
from the third party controller and output alarm, defrost
and run status signal.
4.5.3 Setting Temperature Mode via a
Third Party Controller (Type 2)
When setting temperature control mode via third party
controller has been selected, the AHU control box does
not respond to instructions from the factory controller
except for address setting and query.
Even if temperature control by a third party controller is
applied, a factory controller is still needed to set the
address because the third party controller cannot do so
Third party controller wiring
Please refer to Figure 4-4 for the wiring diagram. Pay
careful attention to the following three things:
1. The distance between the third party controller and the
AHU control box depends on the external device that is
connected (controller/relay…)
2. If several AHU control boxes in parallel connection
control one AHU, the third party controller only needs to
be connected with the master AHU control box.
CN9CN32CN61
Vi+
Vi-
CN17
CN18
Alarm
The third party controller
Defrost
Run status
0-10V signal
Fan
status
Heat
mode
On/off
Cool
mode
CN62
Terminal block of AHU control box
Figure 4-4
Normal (V)
0
1
2
3
4
5
6
7
8
9
10
Range (V)
U<0.5
0.5≤U<1.5
1.5≤U<2.5
2.5≤U<3.5
3.5≤U<4.5
4.5≤U<5.5
5.5≤U<6.5
6.5≤U<7.5
8.5≤U<9.5
8.5≤U<9.5
9.5≤U≤10
Capacity setting
requiment
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Analog input 0-10V DC