VAV-SVN03A-EN
20
Figure 7:
Binary Output Wiring for Optional Relay Board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
N
O
T
U
S
E
D
N
C
N
O
AU
X
W
2
/O
W1
Y
2
Y
1
G
R
h
R
c
24 V*
C1
C2
Ht1
Ht2
2H/2C
Ht. Pump
*24 Vac from the rooftop unit. For single transformer systems,
connect Rc to Rh. For two transformer systems, connect the
cooling transformer to RC and the heating transformer to Rh.
C/O
24 V*
FAN
FAN
COMP1
COMP2
EM HT
Termination Board TB1
Install the Bypass Dampers and
Communicating Sensor/Bypass Control
Assembly
Install Bypass Dampers
Bypass damper(s) should be located before the first zone runs out from the
supply air duct. VariTrac dampers or supply duct branches should be
installed downstream of bypass dampers. The distance between bypass
dampers and the communicating sensor/bypass control should be two to
three equivalent duct diameters.
In a ducted return system, bypass dampers will be ducted directly to the
return air duct.
In systems with plenum return, bypass damper(s) should be ducted into the
return air riser. Confirm that sufficient relief or exhaust exists to prevent
return plenum pressurization. See Figure 8.
IMPORTANT
The use of a relief fan or backdraft damper is strongly recommended in the
return air system. This will prevent bypassed air from pressurizing the
return air duct system and spilling out of return grills into conditioned
space, especially when the unit is in economizer mode.
Getting Started
