Orion System VCM-X Modular E-BUS - Manual (Page 38)

ADDITIONAL APPLICATIONS
VCM-X Modular E-BUS Controller Technical Guide 38
One Condenser Head Pressure Module Overview and Wiring
One Condenser Head Pressure Module
The One Condenser Head Pressure Module ( OE370-23-HP1C) monitors
four individual head pressure transducers and controls the Condenser
Fan or Water Valve based on the highest of the four readings.
A pulse
width modulation (PWM) signal or 0-10 volt output signal is used to
control the condenser fan.
The One Condenser Head Pressure Module connects to the VCM-X
Modular E-BUS Controller ( OE332-23E-VCMX-MOD-A) or VCM-X
WSHP E-BUS Controller ( OE332-23E-VCMX-WSHP-A). This allows
the One Condenser Head Pressure Module to receive setpoints from
the VCM-X Modular E-BUS Controller or VCM-X WSHP E-BUS
Controller. See Figure 34 below for wiring diagram.
The One Condenser Head Pressure Module requires a 24 VAC power
connection with an appropriate VA rating.
NOTE: For complete information, including the sequence of
operation, refer to the One Condenser Head Pressure Module
Technical Guide.
Figure 34: One Condenser Head Pressure Module Wiring Diagram
SIG
GND
+V
BK
RD
WH
SIG
GND
+V
BK
RD
WH
SIG
GND
+V
BK
RD
WH
SIG
GND
+V
BK
RD
WH
COM
Condenser Fan
ECM Motor
+
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
OE370-23-HP1C
One Condenser Head Pressure Module
Connect To VCM-X
Modular E-BUS Controller or
VCM-X WSHP E-BUS Controller
(See for details.) Figure 33
+5V
SIG 2
GND
OP
T IO
N
S
ALARM
ANALOG
STAT
+5V
COMM
GND
SIG 4
GND
BIN 2
R1
R2
GND
RELAYS
ADDRESS
SIG 3
+5V
GND
BIN 1
COM
+5V
SIG 1
R3
R4
Rc
AO1
AO2
PWM1-
PWM1+
PWM2-
PWM2+
PWR
COM
Condenser
Signal
+
HSSC Cable
24 VAC Transformer
3 VA Minimum
Line Voltage
24 V
A
C
GND
WARNING!!
Observe Polarity! All
boards must be wired
with GND-to-GND and
24 VAC-to-24 VAC.
Failure to observe
polarity could result
In damage to the boards.
HSSC Cable
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
CONDENSER A ENABLE
R1
HVAC UNIT CONNECTION
NOTE:
NORMALLY OPEN AND
RATED FOR 24 VAC POWER
ONLY
ALL RELAY OUTPUTS
ARE
- 1 AMP MAXIMUM LOAD
COMM