Technical Guide 3
Full Digital Module
Overview
The Full Digital Module (OE370-23-FD-A) is a device that enables and
modulates up to four digital compressors on HVAC Units controlled
by the VCM-X Modular Controller (OE332-23-VCMX-MOD-A) or
VCM-X Modular E-BUS Controller (OE332-23E-VCMX-MOD-A).
The Full Digital Module will control the digital compressors to satisfy
the cooling, dehumidifi cation, and heat pump requirements of the VCM-
X Modular series controller.
If the Full Digital Module is in the Cooling Mode or Heat Pump Heat-
ing Mode, it will modulate the compressors to maintain the appropriate
Supply Air Temperature Setpoint. If the module is in the Dehumidifi ca-
tion Mode, it will modulate compressors to maintain the Coil Suction
Temperature Setpoint. If the module is in the Heat Pump Heating Mode,
the module can also monitor a signal for a Defrost Cycle from the VCM-
X Modular series controller if a One Condenser Head Pressure Module
(OE370-23-HP1C) is also installed.
Module Overview
Figure 1: Full Digital Module
The Full Digital Module is connected to the VCM-X Modular Control-
ler using the E-BUS Distribution Module (OE365-23-EBD). The Full
Digital Module can also be directly connected to the VCM-X Modular
E-BUS Controller. Either connection allows the Full Digital Module
to receive setpoints and monitor the Supply Air Temperature from the
VCM-X Modular series controller. The Full Digital Module requires a
24 VAC power connection with an appropriate VA rating.
NOTE: The Full Digital Module contains no user-serviceable
parts. Contact qualified technical personnel if your
module is not operating correctly.
www.orioncontrols.com
1003
1002
10uF
300
1
2
4
8
SERIAL #
C2
D3
D4
R7
R9
R11
R12
R13
R14
R23
R24
R25
R26
R28
R29
R30
SW1
D12
D13
R53
R54
TB3
C20
R34 R50
SW2
+5V
SIG 2
GND
1003
1002
10uF
1003
1002
10uF
1003
1002
10uF
4751
4751
4751
4751
OFF
OFF
OPTIONS
ALARM
ANALOG
STAT
+5V
COMM
GND
SIG 4
300
GND
BIN 2
R1
4
R2
4
GND
1002
1002
1002
1002
1002
1002
1002
1002
RELAYS
ADDRESS
SIG 3
+5V
GND
BIN 1
COM
+5V
SIG 1
R3
R4
Rc
AO1
AO2
PWM1-
PWM1+
PWM2-
PWM2+
.01uF
PWR
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