Zone
Zone
INSTALLATION & WIRING
VCB-X Controller Field Technical Guide
36
VCB-X EM1 Expansion Module Input Wiring
Figure 22: VCB-X EM1 Expansion Module Input Wiring Diagram
WARNING!!
Observe Polarity! All boards must be wired with GND-to-GND and 24VAC-to-24VAC. Failure
to observe polarity will result in damage to one or more of the boards. Expansion Modules
must be wired in such a way that the expansion modules and the controller are always
powered together. Loss of power to the expansion module will cause the controller to
become inoperative until power is restored to the expansion module.
Connect FRP Tubing To High Pressure
Port (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere
OE271
Static Pressure
Transducer
Splice If Required
(See Detailed
Wiring Diagram)
OE258-01 BUILDING STATIC
PRESSURE SENSOR
+
-
LO
W
HIG
H
COM
OUT
EXC
+
+
PLASTIC TUBING
TO BUILDING
PRESSURE
SENSING
LOCATIONS
SIG 2
GND
+5V
HEAD PRESSURE
TRANSDUCER 1
BK
RD
WH
OE231 RETURN AIR TEMP.
SENSOR
LEAVING WATER TEMP. SENSOR
MOUNT IN LEAVING
WATER PIPE
MOUNT IN HVAC UNIT
RETURN AIR STREAM
REMOTE FORCED OCCUPIED-N.O. CONTACT
BIN3
BIN2
BIN1
HOOD ON-N.O. CONTACT
PROOF OF WATER FLOW-N.O. CONTACT
T1
T2
GND
GND
+5V
SIG1
GND
SIG2
GND
To 24
VAC
VCB-X EM1
Expansion Module
Connect To
Expansion Module(s)
(When Used)
Connect To
Controller
VCB-X
Size Transformer
For Correct Total
Load. VCB-X E 1
Module = 5 VA
M
C
1
1
2
T3
GND
+5V
HEAD PRESSURE
TRANSDUCER 2
BK
RD
WH
T3
VCB-X EM1 Expansion Module Inputs
The VCB-X EM1 Expansion Module ( OE336-23-EM1-A) provides
an additional 6 analog inputs, 4 analog outputs, 3 binary inputs, and
5 con
fi
gurable relay outputs. See
Figures 22 & 23
for complete
wiring details.
The VCB-X EM1 Expansion Module can be used in conjunction
with the VCB-X EM2 Expansion Module ( OE336-23-EM2-A) and
the E-BUS 12-Relay Expansion Module (OE358-23E-12R-A). The
expansion modules can be used individually or together to provide
the required inputs and outputs for your speci
fi
c applications.
Revised 8/7/14
