Orion System Dual Digital Module - Manual (Page 3)

Technical Guide 3
Dual Digital Module
Overview
The Dual Digital Module (OE370-23-DD-C) is a device that enables and
modulates two digital compressors on HVAC Units controlled by the
VCM-X Modular Controller (OE332-23-VCMX-MOD-C) or VCM-X
Modular E-BUS Controller (OE332-23E-VCMX-MOD-C). The Dual
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 Dual 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 Two Condenser Head Pressure Module
(OE370-23-HP2C) is also installed.
Module Overview
Figure 1: Dual Digital Module
The Dual Digital Module must be used in conjunction with the VCM-
X Modular Controller. The Dual Digital Module is connected to the
VCM-X Modular Controller using the E-BUS Distribution Module
(OE365-23-EBD). The Dual Digital Module can also be directly con-
nected to the the VCM-X Modular E-BUS Controller. Either connection
allows the Dual Digital Module to receive setpoints and monitor the
Supply Air Temperature from the VCM-X Modular series controller.
The Dual Digital Module requires a 24 VAC power connection with an
appropriate VA rating.
NOTE: The Dual Digital Module contains no user-serviceable
parts. Contact qualifi ed technical personnel if your mod-
ule is not operating correctly.