AAON RSMZ User Manual

5
RSMZ Technical Guide
OVERVIEW
RSMZ Overview
RSMZ Features & Applications
The Refrigerant System Module for VFD Compressors (RSMZ)
monitors and controls one refrigeration circuit of the HVAC unit.
The RSMZ is used on RZ units and on RN-E units with Danfoss
compressors. The module is designed for R410-A refrigerant.
The RSMZ is connected to an AAON unit controller. Three or six
RSMZ 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 the E-BUS Modules. There
is a MODBUS terminal block which allows wiring to the Reheat
Expansion Module or VFD Compressor.
The RSMZ provides four analog inputs, four binary inputs, four
relays, and two analog outputs. See Figures 2 through 5, pages
9 through 12 for wiring.
The RSMZ Module provides the following:
• Modulates the compressors to satisfy the Suction Coil
(Saturated) Temperature. The Suction Coil (Saturated)
Temperature Setpoint is reset by the AAON unit
controller to maintain the Supply Air Temperature
during Cooling Mode. During Dehumidication Mode,
it controls the compressors to the Suction (Saturation)
Temperature Setpoint.
• Modulates the condenser fan or valve 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 congurations, sensors, alarms, and
to change the module’s address, if necessary.

AAON RSMZ Specifications

General

Brand	AAON
Model	RSMZ
Category	Control Unit
Language	English