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RSMD-CM Technical Guide
OVERVIEW
Features and Applications
Features and Applications
The Refrigerant System Module for Digital Compressors with
Condenser Fans with Microchannel Coils (RSMD-CM) can
monitor and control up to two compressors and condensers.
The compressors can be in either a tandem or non-tandem
configuration. The module is designed for R410-A refrigerant.
The RSMD-CM is for units that match all of the following
criteria:
1.
One or two circuits.
2.
Compressors may be any mix of fixed, two-step, and
digital.
3.
Reheat is present on the first circuit.
The RSMD-CM must be connected to a VCCX2 Controller. Up
to four RSMD-CM Modules can be connected, depending on the
size of the system. There are two E-BUS expansion ports which
allow the use of communicating sensors and E-BUS modules.
The RSMD-CM Module provides the following:
• Modulates the compressors to satisfy the Suction Coil
(Saturation) Temperature. The Suction Coil (Saturation)
Temperature Setpoint is reset by the VCCX2 Controller
to maintain the Supply Air Temperature during Cooling
Mode. During Dehumidification Mode, it controls
the compressors to directly maintain the Suction
(Saturation) Temperature Setpoint.
•
When the Heat Pump is in Heating Mode, the RSMD-CM
modulates and stages the compressors to maintain a
given Supply Air Temperature Setpoint.
• Modulates the condenser to maintain the Head Pressure
Setpoint.
• Provides alarms and safeties for the compressor and
condenser operation.
•
For convenience on split systems, with the proper
communication cable installed, the RSMD-CM
provides a port for connecting the Modular Service
Tool SD to the VCCX2.
• Provides a 2 x 8 LCD character display and four buttons
that allow access to system status, setpoints, alarms and
some configuration settings.
Summary of Contents for RSMD-CM
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