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5.7
CAV constant airflow mode
5.7.1 Description
In constant airflow operation, the VCHV-A located to the right of the INTZ safety switch on one side of
the unit regulates the motor speed to achieve the desired airflow setpoint. The airflow setpoint is to be
entered on the VCHV-A in m
3
/h or m
3
/hx1000 depending on the size of the unit.
5.7.2 Command wiring
For Analog/Digital controls use cable with the following characteristics:
• Sheath Ø: 6.8mm to 9mm
• Strand cross-section: 0.7mm² to 1mm².
• Recommended minimum stripping: 10mm
• Maximum recommended length: 30m
For Modbus control, use cable with the following characteristics:
• On terminal block terminals 1,2,3 :
-
Sheath Ø: 6.8mm to 9mm
• Strand cross-section: 0.7mm² to 1mm².
• Recommended minimum stripping 10mm
On RJ12 connectors:
•
Telecommunication cable/flat cable, 6-core, unshielded, 30 AWG/0.066 mm²
Maximum recommended length for Modbus communication: 100m, for longer lengths see § "5.2 Modbus
connection - Connection to a BMS", page 19.
Factory wired
Accessory wired - ON/OFF
CONTROLLER
TERMINALS
A
B
Gnd
+10V
0-10V
GND
D2
D1
D0
Gnd
1
2
3
4
5
6
7
8
9
10
SHUNT ON/OFF
Factory wired
+24V 0-10V Ou
t
Gn
d
0-20mA out
VCHV-A
Factory wired
R2 No
R2 C
R2 Nc
R1 No
R1 C
R1 Nc
Gnd
+24V
+10V
AO_1
DI_4
DI_3
AI_2
Therm
Gnd
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
CONTROLLER
TERMINALS
A
B
Gnd
+10V
0-10V
GND
D2
D1
D0
Gnd
1
2
3
4
5
6
7
8
9
10
Instead of
the shunt
13
34
14
33
BCCA 1V
Accessory not provided
CONTROLLER
TERMINALS
A
B
Gnd
+10V
0-10V
GND
D2
D1
D0
Gnd
1
2
3
4
5
6
7
8
9
10
SHUNT ON/OFF
Factory wired
+24V 0-10V Ou
t
Gn
d
0-20mA out
VCHV-A
Factory wired
R2 No
R2 C
R2 Nc
R1 No
R1 C
R1 Nc
Gnd
+24V
+10V
AO_1
DI_4
DI_3
AI_2
Therm
Gnd
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
CONTROLLER
TERMINALS
A
B
Gnd
+10V
0-10V
GND
D2
D1
D0
Gnd
1
2
3
4
5
6
7
8
9
10
Instead of
the shunt
13
34
14
33
BCCA 1V
Accessory not provided
