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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
HEAT 4
RELAY
PILOT RELAYS
HEAT 3
RELAY
HEAT 2
RELAY
FAN/HEAT 1
RELAY
24VAC
+
-
24VAC TRANSFORMER
V
A
V
/V
V
R
C
O
N
T
R
O
L
L
E
R
B
O
A
R
D
CONNECTING THE DIGITAL OUTPUTS
The VAV / VVR provides four (4) SPST relay outputs for control of box fans and/or electric heat strips. The outputs
provide a normally open contact, and will interface with most box manufacturer control sequences. Figure 13 shows
output wiring utilizing external pilot relays.
NOTE:
The maximum current for each digital output is 1 amp at 24V (AC or DC).
CAUTION:
The digital outputs on the VAV / VVR are for low voltage, pilot duty switching.
DO NOT ATTEMPT TO SWITCH LINE VOLTAGE
(120V or higher)
through the digital outputs, serious damage may be done to the VAV / VVR
controller.
Figure 13: Typical VAV Pilot Relay Output Wiring
