AAON ASM02293, Техническое руководство

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5 RSMVQ Technical Guide
OVERVIEW
RSMVQ Overview
RSMVQ Features and Applications
The Refrigerant System Module for VFD compressors with
DMQ
®
Universal Superheat Control/Sensor (RSMVQ) monitors
and controls one or two refrigeration circuits of the AAON unit. It
is used in conjunction with the VCCX2 Controller. The RSMVQ
module is designed for R410-A refrigerant.
The RSMVQ is for units with the following configurations:
1. One or two circuits with no reheat, reheat on the first
circuit if one circuit, or reheat on both circuits if two
circuits.
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
®
Electronic Expansion
Valve (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 EXVs.
In addition, the RSMVQ cannot be used in a heat pump
application (air-to-air or water-source) and cannot have multiple
RSM modules.
The RSMVQ uses an E-BUS cable to connect to the VCCX2
Controller. Only one RSMVQ can be connected. There are two
E-BUS expansion ports which allow connection to the VCCX2
Controller, communicating sensors, and other E-BUS modules.
The RSMVQ is configured using Prism 2 software.
The RSMVQ provides four analog inputs, two binary inputs,
four relays, and two analog outputs. See
Figures 2 and 3, pages
8 and 9,
for wiring.
The RSMVQ 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 Superheat Controller
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.