Orion System VCM Controller - Manual (Page 28)

Technical Guide
VCM Controller 28
CO
2
Sensor Wiring
The OE255 or OE256 CO
2
Sensors are used to sense the current CO
2
level in the conditioned space. The pullup resistor PU3 must be re-
moved and the voltage jumper J03 must be in position (0-10 VDC posi-
tion ) on the OE354, 4 Analog Input 1 Analog Output Expansion Board
for proper operation of the CO
2
Sensor. See Figure 25 for detailed wir-
ing.
24
V
A
C
GND
10 VA Minimum Power Required For
Each 2 Slot Expansion Base Board.
20 VA Minimum Power Required For
Each 4 Slot Expansion Base Board
R20
C8
TB2
D3
PWR LD1
24V
AC-IN GND GND
TB1
PJ2
+24VDC-OUT
R17
PJ1
R15
Connect To VCM Controller
Connect To Next Expansion Base Board
(When Used)
OE354
-
4
Analog
Input
-1
Analog
Output
Board
GND
AIN3
0-10 VDC Input
JO3
JO4
JO2
JO1
CX2
R10
AOUT1
AIN4
TB1
GND
AIN2
AIN3
AIN1
PU4
U2 D5
Q1
R8
R9
LM358
C5
C1
R7
R6
R5
PU3
C4
C3
C2
PU2
PU1
4 ANALOG IN MOD. I/O BD.
R3
PCF8591P
YS101784
D4
R4
D3
D1
D2
R2
R1 CX1
U1
P1
OE255 or OE256
CO Sensor
(0-10VDC Signal)
2
1.
- N ot
Used
2.
- N ot
Used
4.
Relay
Common
5.
Relay
Norm
Closed
6.
4-20mA
Output
3.
Relay
Norm
Open
7.
Signal
Ground
8.
0-10V
Output
Pin
D esignations
Pin
D esignations
1.
AC+/DC+
2.
AC/GND
Pullup Resistor PU3 Must
Be Removed As Shown
Jumper J03 Must
Be In Place As Shown
OE352 or OE353 Expansion Base Board
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
Boards must be wired in such a way that power to both the
expansion boards and the controller are always powered
together. Loss of power to the expansion board will cause
the controller to become inoperative until power is restored
to the expansion board.
Input/Output Wiring Details
Warning: It is extremely important to be certain that the
CO
2
Sensors “AC/GND” terminal is connected to
the GND terminal on the OE354 expansion board
and to the 24 VAC expansion base board power
source GND connection. The “AC+/DC+ ”
terminal on the CO
2
Sensor must be connected to
the 24 VAC power side of the 24 VAC power
source supplying power to the expansion base
board terminal as shown. Failure to observe the
correct polarity will result in damage to the HVAC
Unit Controller, CO
2
Sensor and the Expansion
Board.
Figure 25: CO
2
Sensor Wiring