IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052
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3. One third party controller can’t control two or more
AHUs at the same time.
Definition of signals between the third
party controller and the AHU control box
1. Signals from the third party controller to the AHU
control box.
Signal
Temp.
set
Signal
Type
Specification Port
Normal
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
refer to Table 6-3
Analog
voltage
ON/OFF ON/OFF
Dry
contact
Cool
mode
COOL
Dry
contact
Heat
mode
HEAT
Dry
contact
Fan
status
FAN
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
Table 4-8
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:
The definition of signals between the third party control-
ler and AHU control box must comply with those shown
in Table 4-7 and Table 4-8. If the signal is incorrectly
defined, the system will not operate properly.
The AHU control box needs to be connected to the
return air temperature sensor T1, and to be
connected to the outlet air temperature sensor TA if
the outlet air temperature control is selected.
The third party controller sends a voltage signal of
0-10V to the AHU control box. The AHU control box
converts the voltage of 0-10V into the target
temperature TS according to Table 4-9 or Table 4-10,
and calculates the temperature difference between
the target temperature and the return temperature T1
or the outlet temperature TA detected by the AHU
control box. The temperature difference is used to
regulate the system output.
Operation at 0-10V temperature output
2
0-10V
Figure 4-5
Third party controller
AHU control box
1
2
Table 4-9
Voltage Range
Third party controller - return air temperature control
setting
Cooling Set
Temperature
(°C)
Heating Set
Temperature
(°C)
0.5
1
1.4
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
5.4
5.8
6.2
6.6
7
7.4
7.8
8.2
8.6
9
9.4
0
0.85
1.25
1.65
2.05
2.45
2.85
3.25
3.65
4.05
4.45
4.85
5.25
5.65
6.05
6.45
6.85
7.25
7.65
8.05
8.45
8.85
9.25
0.75
1.15
1.55
1.95
2.35
2.75
3.15
3.55
3.95
4.35
4.75
5.15
5.55
5.95
6.35
6.75
7.15
7.55
7.95
8.35
8.75
9.15
10
Not available
17
17
17
17
17
17
17
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Not available
Not available
17
17
17
17
17
17
17
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Not available
Min. Max.
Normal
Table 4-10
Voltage Range
Cooling Set
Temperature
(°C)
Heating Set
Temperature
(°C)
0.5
1
1.4
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
5.4
5.8
6.2
6.6
7
0
0.85
1.25
1.65
2.05
2.45
2.85
3.25
3.65
4.05
4.45
4.85
5.25
5.65
6.05
6.45
6.85
0.75
1.15
1.55
1.95
2.35
2.75
3.15
3.55
3.95
4.35
4.75
5.15
5.55
5.95
6.35
6.75
7.15
Non settable
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Non settable
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Min. Max.
Third party controller - outlet air temperature control
setting
1
Table 4-7