Page 16
CONNECTING THE DUCT SENSOR
The duct sensor monitors the incoming supply air temperature, and allows the reverse operation of the damper upon
a high entering duct temperature. This is typically used on air handling equipment with morning warmup function.
The reversing function will reverse the operation of the damper i.e. open on a call for heat.
Mount the sensor upstream from the VAV box in the branch duct according to the manufacturer’s installation
instructions. Make sure that the sensor is in a straight section of duct, and install at least 5 duct diameters ahead of
box and away from elbows.
Connect the duct sensor as shown in Figure 12.
Figure 12: Duct Sensor Wiring
CONNECTING THE DIGITAL INPUTS
The VAV / VVR contains two (2) digital inputs:
Digital Input 1 is dedicated for the override button on the room sensor as shown in Figure 10.
Digital Input 2 is a free input, and may be used for monitoring of any dry-contact input. This point may be used to
monitor flow switches, current switches, filter switches, etc. and is connected directly next to the override input as
shown in Figure 11.
L
1
L
2
N
O
C
N
O
C
N
O
C
N
O
C
4
3
2
1
2
4
V
A
C
H
E
A
T
IN
G
R
E
L
A
Y
O
U
T
P
U
T
S
RED
BLACK
2 PAIR CABLE
+
-
+
-
+
-
A
O
1
1
2
A
N
A
L
O
G
IN
P
U
T
S
RED
BLACK
V
A
V
/V
V
R
C
O
N
T
R
O
L
L
E
R
B
O
A
R
D
GREEN
WHITE
BUTT SPLICES - DO
NOT
USE WIRE NUTS
INSTALL SENSOR UPSTREAM IN
ENTERING AIR DUCT
A
C
I/1
0
K
-C
P
-D
4
DUCT SENSOR
RED
BLACK
A
U
T
O
M
A
T
IO
N
C
O
M
P
O
N
E
N
T
S
,
IN
C
.
