AAON RSMVQ2R, Техническое руководство

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5
RSMVQ2R Technical Guide
OVERVIEW
RSMVQ2R Overview
RSMVQ2R Features & Applications
The Refrigerant System Module for VFD compressors with
DMQ Superheat Control and second circuit reheat (RSMVQ2R)
monitors and controls two refrigeration circuits of the HVAC
unit. The module is designed for R410-A refrigerant.
The RSMVQ2R is for units with the following configurations:
1. Must have second circuit reheat and no reheat on the
first circuit.
2. Must have one MODBUS-controlled VFD compressor
on the first circuit.
3. Must have a fixed or two-step compressor on the
second circuit.
4. Must have at least one DMQ EXV.
Optional configurations include:
1. A single condenser fan output signal for two circuits
or one condenser fan output signal per circuit.
2. Single or dual DMQ EXVs.
In addition, the RSMVQ2R cannot be a Heat Pump (air-to-air or
water-source) and cannot have multiple RSM modules.
The RSMVQ2R uses an EBC E-BUS cable to connect to the
VCCX2 Controller. Only one RSMVQ2R can be connected.
There are two E-BUS Expansion Ports which allow the use of
communicating sensors and the E-BUS Modules.
The RSMVQ2R is configured using Prism 2 software.
The RSMVQ2R provides four analog inputs, two binary inputs,
four relays, and two analog outputs. See Figures 2 & 3, pages
8 & 9 for wiring.
The RSMVQ2R provides the following:
• Modulates the Compressors or controls staging to
satisfy the Suction Coil (Saturated) Temperature.
The Suction Coil (Saturated) 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
the Suction (Saturation) Temperature Setpoint.
• Modulates the Condenser Fan(s) to maintain the Head
Pressure Setpoint.
• Monitors the performance of the DMQ Universal
Superheat Controller/Sensor (USHX) to maintain the
Superheat Setpoint of each evaporator coil.
• Provides alarms and safeties for the compressor and
condenser operation.
• Provides a 2 x 8 LCD character display and four
buttons that allow for status of system operation, system
setpoints, system configurations, sensors, alarms, and
to change the module’s address, if necessary.