AAON RSMZ Quick start guide

RSMZ
Technical Guide

AAON
2425 South Yukon Ave.
Tulsa, OK 74107-2728
www.aaon.com
Factory Technical Support Phone: [phone]
AAON®Controls Support: 866-918-1100
It is the intent of AAON®to provide accurate and current
product information. However, in the interest of product
improvement, AAON®reserves the right to change pricing,
specications, and/or design of its product without notice,
obligation, or liability.
AAON P/N: G081900, Rev. A
Copyright June 2021 © AAON. All rights reserved
throughout the world.
AAON® and AAONAIRE® are registered trademarks of
AAON, Inc., Tulsa, OK.
BACnet® is a registered trademark of ASHRAE Inc., Atlanta,
GA.
Danfoss VFD® is a registered trademark of Danfoss
Commercial Compressors, S.A., Tallahassee, FL
AAON® assumes no responsibility for errors or omissions
in this document.
RSMZ REVISION LOG
REVISION & DATE CHANGE
Rev. A June 10, 2021 Original
www.aaon.com
RSMZ PARTS REFERENCE
PART DESCRIPTION PART NUMBER
RSMZ Module ASM02351
VCCX2 Controller ASM01698
Subcool Monitor Module ASM02350
Reheat Expansion Module ASM01687
EBC E-BUS Cable Assembly E-BUS Power & Comm
1.5 ft., 3 ft., 10 ft., 25 ft., 50 ft., 75 ft.,
100 ft., 150 ft., 250 ft., and 1000 ft. Spool
G029440 (1.5 ft.), G012870 (3 ft.), G029460 (10 ft.), G045270 (25 ft.),
G029510 (50 ft.), G029530 (75 ft.), G029450 (100 ft.), G029470 (150 ft.),
V36590 (250 ft.), G018870 (SPOOL)
E-BUS Adapter Hub with 1.5 ft.. E-BUS Cable ASM01635
E-BUS Adapter Board ASM01878
All manuals are also available for download from
www.aaon.com/controlsmanuals.

3
RSMZ Technical Guide
TABLE OF CONTENTS
OVERVIEW....................................................................................................................... 5
RSMZ Overview...................................................................................................................................................... 5
RSMZ Dimensions .................................................................................................................................................. 6
INSTALLATION AND WIRING......................................................................................... 7
Electrical and Environmental Requirements ........................................................................................................... 7
RSMZ Module and Subcool Monitor Input/Output Maps ........................................................................................ 8
WIRING ............................................................................................................................ 9
RSMZ Inputs Wiring - Modules 1, 2, 4, and 5 ......................................................................................................... 9
RSMZ Outputs Wiring - Modules 1, 2, 4, and 5 .................................................................................................... 10
RSMZ Inputs Wiring - Modules 3 and 6 .................................................................................................................11
RSMZ Outputs Wiring - Modules 3 and 6 ............................................................................................................. 12
Reheat Expansion Module.................................................................................................................................... 13
Subcool Monitor Module ....................................................................................................................................... 14
SEQUENCE OF OPERATIONS....................................................................................... 15
Modes of Operation .............................................................................................................................................. 15
Alarms................................................................................................................................................................... 16
Alarm Faults.......................................................................................................................................................... 17
Alarm Lockouts ..................................................................................................................................................... 18
Subcool Monitor Module Operation ...................................................................................................................... 19
LCD SCREENS ............................................................................................................... 20
LCD Display Screen and Navigation Keys............................................................................................................ 20
RSMZ LCD SCREENS .................................................................................................... 21
Main Screens Map ................................................................................................................................................ 21
Module Screens .................................................................................................................................................... 22
System Status Screens......................................................................................................................................... 23
Sensor and Setpoint Status Screens .................................................................................................................... 24
Alarm Warnings and Alarm Faults Screens .......................................................................................................... 25
Alarm Lockouts ..................................................................................................................................................... 26
Danfoss Menu Screens......................................................................................................................................... 27
SUBCOOL MONITOR LCD SCREENS ........................................................................... 29
Main Screens Map and Subcool Screens............................................................................................................. 29
Circuit Status and Alarm Screens ......................................................................................................................... 30
Setpoint Screens................................................................................................................................................... 31
APPENDIX A: TROUBLESHOOTING............................................................................. 32
RSMZ LED Diagnostics ........................................................................................................................................ 32
Subcool Monitor LED Diagnostics ........................................................................................................................ 33
Reheat Expansion Module LED Diagnostics ........................................................................................................ 34
Temperature Sensor Testing ................................................................................................................................. 35
Liquid Line and Head Pressure Transducer.......................................................................................................... 36
APPENDIX B: DANFOSS VFD ....................................................................................... 37
Parameter Congurations ..................................................................................................................................... 37
APPENDIX C: SYSTEM CONFIGURATION ................................................................... 38
Module and Condenser Conguration .................................................................................................................. 38

4RSMZ Technical Guide
FIGURES AND TABLES
TABLES
Table 1: Electrical and Environmental Requirements..........................................................................................................7
Table 2: RSMZ Inputs and Outputs .......................................................................................................................................8
Table 3: Subcool Monitor Inputs and Outputs.......................................................................................................................8
Table 4: Reheat Expansion Module Outputs ........................................................................................................................8
Table 5: Navigation Key Functions.......................................................................................................................................20
Table 6: Editing Key Functions..............................................................................................................................................20
Table 7: STATUS LED Blink Codes......................................................................................................................................32
Table 8: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors .....................................................35
Table 9: 0-667 psi Transducer Chart....................................................................................................................................36
Table 10: Danfoss VFD Parameter Congurations..............................................................................................................37
FIGURES
Figure 1: RSMZ Dimensions ...................................................................................................................................................6
Figure 2: RSMZ Inputs Wiring - Modules 1, 2, 4, and 5 .......................................................................................................9
Figure 3: RSMZ Outputs Wiring - Modules 1, 2, 4, and 5..................................................................................................10
Figure 4: RSMZ Inputs Wiring - Modules 3 and 6 ............................................................................................................... 11
Figure 5: RSMZ Outputs Wiring - Modules 3 and 6............................................................................................................12
Figure 6: Reheat Expansion Module Wiring.........................................................................................................................13
Figure 7: Subcool Monitor Module Wiring ............................................................................................................................14
Figure 8: LCD Display and Navigation Keys........................................................................................................................20
Figure 9: RSMZ LED Locations .............................................................................................................................................32
Figure 10: Subcool Monitor LED Locations............................................................................................................................33
Figure 11: Reheat Expansion Module LEDs ..........................................................................................................................34
Figure 12: RSMZ Module Conguration .................................................................................................................................38
Figure 13: RSMZ Prism 2 Condenser Conguration ............................................................................................................38

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.

6RSMZ Technical Guide
OVERVIEW
RSMZ Dimensions
Figure 1: RSMZ Dimensions
6.10
2.05 2.05
4.10
5.61 4.98
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02351
+24 VAC
GND
RELAY CONTACT RATING IS
1 AMP MAX @ 24 VAC
COND FAN ENABLE
COMP 1 ENABLE
COMP 2 ENABLE
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G050220
COND FAN VFD
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REHEAT ENABLE
+5 V
DISCHARGE TEMP
COMP 2 STATUS
SP
GND
EMER SHDN
GND
NOT USED
GND
BINARY INPUTS
MODBUS
RSMZ CONTROLLER
www.aaon.com
HEAD
PRESSURE
SENSOR
DUAL
E-BUS
EXP VALVE1
+5 V
HP
GND
NOT USED
NOT USED
GND
NOT USED
EXP VALVE2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALVE3
NOT
INSTALLED
EXP VALVE4
NOT
INSTALLED
EACH EXP VA LVE IS INDIVIDUALLY
ELECTRICALLY ISOLATED
OIL LEVEL SWITCH
COMP1STATUS
NOT USED
NOT USED
+5V
SP
GND
CONT
+5V
GND
HP
STATUS
ALARM
COMM
POWER
TEMP1TEMP1
TEMP2
TEMP4
TEMP3
TEMP5
TEMP6
GND
GND
BIN1
BIN2
BIN3
BIN4
GND
AOUT1
AOUT2
GND
RLY2
RLY1
RLY4
RLY3
COMMON
EXV-2
R+
SHD
T-
EXV-1
R+
SHD
T-
EXV-4
R+
SHD
T-
EXV-3
R+
SHD
T-
Note: All Dimensions are in inches.
Note: Depth is 1.50 inches.

7
RSMZ Technical Guide
INSTALLATION AND WIRING
Electrical and Environmental Requirements
General
Correct wiring of the AAON unit controller and its modules is
the most important factor in the overall success of the controller
installation process. The AAON unit controller and modules are
installed and wired at the AAON factory. Some of the following
information may not apply to your installation if it was pre-wired
at the factory. However, if troubleshooting of the controller or
modules is required, it is a good idea to be familiar with the
system wiring.
Wiring
The modules must be connected to an 18-30 VAC power source
of the proper size for the calculated VA load requirements. All
transformer sizing should be based on the VA ratings listed in
Table 1, this page.
NOTE: If the temperature at the module is below -22ºF
(-30ºC), the display refresh rate could be less
responsive.
WARNING: When using a single transformer to power
more than one controller or expansion
module, the correct polarity must always
be maintained between the boards. Failure
to observe correct polarity will result in
damage to the unit controller, RSMZ, and
any associated module.
Please carefully read and apply the following information when
wiring the unit controller, RSMZ, and any associated module.
1. All wiring is to be in accordance with local and
national electrical codes and specications.
2. All 24 VAC wiring must be connected so that all
ground wires remain common. Failure to follow this
procedure can result in damage to the controller and
connected devices.
3. Minimum wire size for 24 VAC wiring should be
18-gauge.
4. Minimum wire size for all sensors should be 24-gauge.
Some sensors require two-conductor wire and some
require three-or four-conductor wire.
5. Minimum wire size for 24 VAC thermostat wiring
should be 22-gauge.
6. Be sure that all wiring connections are properly
inserted and tightened into the terminal blocks. Do
not allow wire strands to stick out and touch adjoining
terminals which could potentially cause a short circuit.
7. When communication wiring is to be used to
interconnect AAON unit controllers together or to
connect to other communication devices, all wiring
must be plenum-rated, minimum 18-gauge, two-
conductor, twisted-pair with shield. AAON can supply
communication wire that meets this specication and
is color coded for the network or local loop. Please
consult your AAON distributor for information. If
desired, Belden #82760 or equivalent wire may also
be used.
8. Before applying power to the AAON unit controller,
RSMZs, and any associated modules, be sure to
recheck all wiring connections and terminations
thoroughly.
Powering Up
When the controller and modules are rst powered up, the
POWER LED should light up and stay on continuously. If it does
not light up, check to be sure that you have 24 VAC connected
to the controller, that the wiring connections are tight, and that
they are wired for the correct polarity. The 24 VAC power must
be connected so that all ground wires remain common. If after
making all these checks, the POWER LED does not light up,
please contact AAON Controls Support for assistance.
Control
Device
Voltage
VA Load
Operating
Temperature
Humidity
(Non-
Condensing)
RSMZ,
Subcool
Monitor,
and Reheat
Expansion
Modules
18-30 VAC 18 -22°F to 158°F
-30ºC to 70ºC 0-95% RH
Inputs
Resistive Inputs require 10KΩ
Type III Thermistor
24 VAC Inputs provide 4.7kΩ
Load
Outputs Relay Outputs: 1 amp
maximum per output.
Table 1: Electrical and Environmental Requirements

8RSMZ Technical Guide
INSTALLATION AND WIRING
RSMZ Module and Subcool Monitor Input/Output Maps
Input/Output Maps
See Table 2, this page for the RSMZ Module inputs and outputs,
Table 3, this page for Subcool Monitor Module inputs and
outputs, and Table 4, this page for the Reheat Expansion Module
inputs and outputs.
RSMZ MODULE
Analog Inputs
1Head Pressure Transducer (HP)
2Discharge Temperature Sensor (TEMP1)
Binary Inputs
1Compressor 1 Status (BI1)
2Compressor 2 Status (BI2)
3Oil Level Switch (BI3)
4Emergency Shutdown (BI4)
Analog Outputs (0-5 VDC)
1Not Used (AO1)
2Condenser Fan VFD (AO2)
Relay Outputs (24 VAC)
1Compressor 1 Enable (RLY1)
2Compressor 2 Enable (RLY2)
3Condenser Fan Enable (RLY3)
4Reheat Enable (RLY4)
DMQ USHX Communication Terminals
1Expansion Valve 1 (EXV-1)
2Expansion Valve 2 (EXV-2)
3Not Installed (EXV-3)
4Not Installed (EXV-4)
Communication Terminals
DUAL
E-BUS 2 EBC E-BUS Ports
MODBUS MODBUS Communication Terminal Block
SUBCOOL MONITOR MODULE
Analog Inputs
1Liquid Line Pressure Transducer 1 (SP-1)
2Liquid Line Pressure Transducer 2 (HP-1)
3Liquid Line Pressure Transducer 3 (SP-2)
4Not Used
Temperature Inputs
1Liquid Line Temperature 1 (TEMP1)
2Liquid Line Temperature 2 (TEMP2)
3Liquid Line Temperature 3 (TEMP3)
Communication Terminals
DUAL
E-BUS 2 E-BUS Ports
REHEAT EXPANSION MODULE
Analog Output
1HGR Valve
Binary Input (24 VAC)
1Reheat Enable Input
Communication Terminals
COM Communication Terminal Block
Table 2: RSMZ Inputs and Outputs
Table 3: Subcool Monitor Inputs and Outputs
Table 4: Reheat Expansion Module Outputs

9
RSMZ Technical Guide
WIRING
RSMZ Inputs Wiring - Modules 1, 2, 4, and 5
Figure 2: RSMZ Inputs Wiring - Modules 1, 2, 4, and 5
18-30
VAC
GND
Line Voltage
BK
RD
WH
COM
+
Head Pressure
Transducer
Discharge
Temperature
Sensor
Compressor 1 Status
Oil Level Switch
Emergency Shutdown
(configurable, only for Module 1)
Condenser Fan
Size transformer for correct total load.
RSMZ = 18 VA
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02351
+24 VAC
GND
RELAY CONTACT RATING IS
1 AMP MAX @ 24 VAC
COND FAN ENABLE
COMP 1 ENABLE
COMP 2 ENABLE
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G050220
COND FAN VFD
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REHEAT ENABLE
+5 V
DISCHARGE TEMP
COMP 2 STATUS
SP
GND
EMER SHDN
GND
NOT USED
GND
BINARY INPUTS
MODBUS
RSMZ CONTROLLER
www.aaon.com
HEAD
PRESSURE
SENSOR
DUAL
E-BUS
EXP VALV E1
+5 V
HP
GND
NOT USED
NOT USED
GND
NOT USED
EXP VALV E2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALV E3
NOT
INSTALLED
EXP VALV E4
NOT
INSTALLED
EACH EXP VA LVE IS INDIVIDUALLY
ELECTRICALLYISOLATED
OIL LEVEL SWITCH
COMP 1 STATUS
NOT USED
NOT USED
+5V
SP
GND
CONT
+5V
GND
HP
STATUS
ALARM
COMM
POWER
TEMP1TEMP1
TEMP2
TEMP4
TEMP3
TEMP5
TEMP6
GND
GND
BIN1
BIN2
BIN3
BIN4
GND
AOUT1
AOUT2
GND
RLY2
RLY1
RLY4
RLY3
COMMON
EXV-2
R+
SHD
T-
EXV-1
R+
SHD
T-
EXV-4
R+
SHD
T-
EXV-3
R+
SHD
T-
RSMZ Input Wiring
The 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 the 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 E-BUS Modules. There
is a MODBUS terminal block which allows wiring to the Reheat
Expansion Module or VFD Compressor.
The RSMZ must be connected to an 18-30 VAC power source.
When wiring the RSMZ, its relay outputs must be wired as wet
contacts (connected to 24 VAC). See Figure 2, this page for
RSMZ input wiring for modules 1, 2, 4, and 5.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.

10 RSMZ Technical Guide
WIRING
RSMZ Outputs Wiring - Modules 1, 2, 4, and 5
Figure 3: RSMZ Outputs Wiring - Modules 1, 2, 4, and 5
RSMZ Output Wiring
See Figure 3, this page for RSMZ outputs wiring for modules
1, 2, 4, and 5.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
18-30
VAC
GND
Line Voltage
24 VAC
R
Danfoss VFD
Terminals
68 (R+)
61 (SHD)
69 (T-)
Connect to AAON unit
controller and next RSMZ
RED
GRN
BLK
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02351
+24 VAC
GND
RELAY CONTACT RATING IS
1 AMP MAX @ 24 VAC
COND FAN ENABLE
COMP 1 ENABLE
COMP 2 ENABLE
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G050220
COND FAN VFD
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REHEAT ENABLE
+5 V
DISCHARGE TEMP
COMP2STATUS
SP
GND
EMER SHDN
GND
NOT USED
GND
BINARYINPUTS
MODBUS
RSMZ CONTROLLER
www.aaon.com
HEAD
PRESSURE
SENSOR
DUAL
E-BUS
EXP VALV E1
+5 V
HP
GND
NOT USED
NOT USED
GND
NOT USED
EXP VALV E2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALV E3
NOT
INSTALLED
EXP VALV E4
NOT
INSTALLED
EACH EXP VA LVE IS INDIVIDUALLY
ELECTRICALLYISOLATED
OIL LEVEL SWITCH
COMP1STATUS
NOT USED
NOT USED
+5V
SP
GND
CONT
+5V
GND
HP
STATUS
ALARM
COMM
POWER
TEMP1TEMP1
TEMP2
TEMP4
TEMP3
TEMP5
TEMP6
GND
GND
BIN1
BIN2
BIN3
BIN4
GND
AOUT1
AOUT2
GND
RLY2
RLY1
RLY4
RLY3
COMMON
EXV-2
R+
SHD
T-
EXV-1
R+
SHD
T-
EXV-4
R+
SHD
T-
EXV-3
R+
SHD
T-
Compressor 1 Enable
Condenser Fan Enable
DMQ USHX #1
Superheat
Controller
Terminals
RSMZ = 18 VA
Size transformer for correct total load.

11
RSMZ Technical Guide
WIRING
RSMZ Inputs Wiring - Modules 3 and 6
18-30
VAC
GND
Line Voltage
BK
RD
WH
COM
+
Head Pressure
Transducer
Discharge
Temperature
Sensor
Compressor 2 Status
Oil Level Switch
Condenser Fan
Compressor 1 Status
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02351
+24 VAC
GND
RELAY CONTACT RATING IS
1 AMP MAX @ 24 VAC
COND FAN ENABLE
COMP 1 ENABLE
COMP 2 ENABLE
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G050220
COND FAN VFD
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REHEAT ENABLE
+5 V
DISCHARGE TEMP
COMP 2 STATUS
SP
GND
EMER SHDN
GND
NOT USED
GND
BINARY INPUTS
MODBUS
RSMZ CONTROLLER
www.aaon.com
HEAD
PRESSURE
SENSOR
DUAL
E-BUS
EXP VALV E1
+5 V
HP
GND
NOT USED
NOT USED
GND
NOT USED
EXP VALV E2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALV E3
NOT
INSTALLED
EXP VALV E4
NOT
INSTALLED
EACH EXP VA LVE IS INDIVIDUALLY
ELECTRICALLYISOLATED
OIL LEVEL SWITCH
COMP 1 STATUS
NOT USED
NOT USED
+5V
SP
GND
CONT
+5V
GND
HP
STATUS
ALARM
COMM
POWER
TEMP1TEMP1
TEMP2
TEMP4
TEMP3
TEMP5
TEMP6
GND
GND
BIN1
BIN2
BIN3
BIN4
GND
AOUT1
AOUT2
GND
RLY2
RLY1
RLY4
RLY3
COMMON
EXV-2
R+
SHD
T-
EXV-1
R+
SHD
T-
EXV-4
R+
SHD
T-
EXV-3
R+
SHD
T-
RSMZ = 18 VA
Size transformer for correct total load.
RSMZ Input Wiring
See Figure 4, this page for RSMZ outputs wiring for modules
3 and 6.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
Figure 4: RSMZ Inputs Wiring - Modules 3 and 6

12 RSMZ Technical Guide
WIRING
RSMZ Outputs Wiring - Modules 3 and 6
18-30
VAC
GND
Line Voltage
24 VAC
R
RED
GRN
BLK
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02351
+24 VAC
GND
RELAY CONTACT RATING IS
1 AMP MAX @ 24 VAC
COND FAN ENABLE
COMP 1 ENABLE
COMP 2 ENABLE
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G050220
COND FAN VFD
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REHEAT ENABLE
+5 V
DISCHARGE TEMP
COMP2STATUS
SP
GND
EMER SHDN
GND
NOT USED
GND
BINARYINPUTS
MODBUS
RSMZ CONTROLLER
www.aaon.com
HEAD
PRESSURE
SENSOR
DUAL
E-BUS
EXP VALV E1
+5 V
HP
GND
NOT USED
NOT USED
GND
NOT USED
EXP VALV E2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALV E3
NOT
INSTALLED
EXP VALV E4
NOT
INSTALLED
EACH EXP VA LVE IS INDIVIDUALLY
ELECTRICALLYISOLATED
OIL LEVEL SWITCH
COMP1STATUS
NOT USED
NOT USED
+5V
SP
GND
CONT
+5V
GND
HP
STATUS
ALARM
COMM
POWER
TEMP1TEMP1
TEMP2
TEMP4
TEMP3
TEMP5
TEMP6
GND
GND
BIN1
BIN2
BIN3
BIN4
GND
AOUT1
AOUT2
GND
RLY2
RLY1
RLY4
RLY3
COMMON
EXV-2
R+
SHD
T-
EXV-1
R+
SHD
T-
EXV-4
R+
SHD
T-
EXV-3
R+
SHD
T-
Compressor 1 Enable
Condenser Fan Enable
DMQ USHX #1
Superheat
Controller
Terminals
RED
GRN
BLK
DMQ USHX #2
Superheat
Controller
Terminals
Compressor 2 Enable
Reheat Enable
( R+)
( SHD)
(T-)
Reheat Expansion Module
Comm Terminal Block
For RSMZ Module #6, connect to Reheat
Expansion Module #2 Comm Terminal Block.
Note: For RSMZ Module #3, connect to Reheat
Expansion Module #1 Comm Terminal Block.
Typical Terminal Blocks
All wiring to be R+ to R+,
SH(G) to SH(G) and T- to T-.
Size transformer for correct total load.
RSMZ = 18 VA
RSMZ Output Wiring
See Figure 5, this page for RSMZ outputs wiring for modules
3 and 6.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
Figure 5: RSMZ Outputs Wiring - Modules 3 and 6

13
RSMZ Technical Guide
WIRING
Reheat Expansion Module
Reheat Expansion Module Wiring
The Reheat Expansion Module connects to the RSMZ
Communication Terminal Block. One or two Reheat Expansion
Modules are used per system.
The Reheat Expansion Module must be connected to an 18-30
VAC power source. See Figure 6, this page for wiring.
18-30
VAC
GND
Line Voltage
RH EN
Size transformer for correct total load.
Reheat Expansion Module = 18 VA
Three-way HGR Valve #1
or
Three-way HGR Valve #2
Black
White
Green
Red
Black
White
Green
Red
Typical Terminal Blocks
All wiring to be R+ to R+,
SH(G) to SH(G) and T- to T-.
( R+)
( SHD)
(T-)
R+ SH T-
Note: For RSMZ Module #3, connect to Reheat
Expansion Module #1 Comm Terminal Block.
For RSMZ Module #6, connect to Reheat
Expansion Module #2 Comm Terminal Block.
NOTE: Please refer to the MHGRV-X Technical Guide for
more information.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
Figure 6: Reheat Expansion Module #1 or #2 Wiring

14 RSMZ Technical Guide
WIRING
Subcool Monitor Module
Subcool Monitor Module Wiring
The use of the Subcool Monitor Module is optional. The Subcool
Monitor Module reads the Liquid Line Temperature Sensors to
calculate subcooling. This module can be congured to work with
R410-A, R22, and R134a refrigerant and can also be congured
for the following pressure transducers—250 psi, 500 psi,
and 667 psi.
The Subcool Monitor Module is connected to the AAON
unit controller. One or two Subcool Monitor Modules can be
connected, depending on the size of the system.
The Subcool Monitor Module contains a 2 x 8 LCD character
display and four buttons that allow for status and alarm display.
The Subcool Monitor Module must be connected to an 18-30
VAC power source.
See Figure 7, this page for wiring.
1
1
0
0
A
A
2
2
5
5
0
0
V
V
A
A
C
C
~
~
5
5
A
A
3
3
0
0
V
V
D
D
C
C
S
S
A
A
V
V
D
D
E
E
G
G
5
5
Q
Q
-
-
1
1
A
A
4
4
O
O
M
M
R
R
O
O
N
N
D
D
C
C
1
1
2
2
V
V
C
C
H
H
I
I
N
N
A
A
BK
RD
WH
BK
RD
WH
BK
RD
WH
18-30 VAC
GND
Line Voltage
Size transformer for correct total load.
Subcool Monitor Module = 18 VA
Liquid Line
Pressure
Transducer 1
Liquid Line
Pressure
Transducer 2
Liquid Line
Pressure
Transducer 3
Sensor #2
Liquid Line Temp
Liquid Line Temp
Sensor #1
Liquid Line Temp
Sensor #3
ALARM
UP
DOWN
ENTERMENU
Figure 7: Subcool Monitor Module Wiring
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.

15
RSMZ Technical Guide
SEQUENCE OF OPERATIONS
Modes of Operation
Overview
The RSMZ may be congured to operate as any one of six
possible modules in the control system. This conguration
automatically adjusts depending on the address of each module.
All systems will consist of either three modules or six modules.
RSMZ control is a three or six circuit cooling system with Reheat.
The six circuit system is eectively two, three-circuit systems
operating in parallel. There is some overlap of controls to ensure
that the two systems operate in the same mode.
Modules at addresses 1, 2, 4, and 5 will each control a variable
speed circuit (single Danfoss scroll compressor) and represent
half of the evaporative face. Superheat is controlled by DMQ,
and there is no Reheat.
Modules at addresses 3 and 6 have two tandem xed compressors,
full evaporative face through two parallel evaporators interlaced
with the variable compressor-controlled circuits. Each Evaporator
Superheat is independently controlled by a DMQ. These circuits
also have parallel Reheat with a three-way valve to Control Feed
to the Reheat coils or the condenser. 100% Reheat is possible.
Sequencing depends on the particular operation—Cooling Mode
or Dehumidication Mode.
Modes of Operation
There are three basic modes of operation for this module:
1. O Mode
2. Cooling Mode
3. Dehumidication Mode
When changing modes, the mode will rst be commanded to
RSMZ Module 1 and that module will then share the mode
change with the other RSMZ Modules so that all modules will
operate in the same mode. If RSMZ Module 1 goes o line for any
reason, then DX coil operations will be stopped for the entire unit.
Off (Stop) Mode
During Emergency O Mode, all compressor(s) will immediately
stop, regardless of run time.
During regular O Mode, all compressor(s) will turn o after
they have met their minimum run times. The condenser fan will
then be disabled and condenser fan control output will be set to
0V. The DX staging sequence will stop and the module status
will change to o.
During Off Mode, monitoring continues to provide status
information and alarms remain activated unless otherwise
indicated.
Cooling Mode
During startup of the Cooling Mode, the RSMZ receives
communication from the AAON unit controller to indicate
Cooling Mode which is then used to stage on cooling.
In Cooling Mode, the variable speed compressors are staged on
together. If additional cooling is needed, the compressors on the
tandem circuit will stage on.
Dehumidication Mode
During startup of Dehumidification Mode, the RSMZ
receives communication from the unit controller to indicate
Dehumidication Mode which is used by the compressor staging
sequence.
If the current state is “all compressors are o” for RSMZ Module
3 or 6, dehumidication will begin once the minimum o time
has been met for module 3’s or 6’s rst compressor (E1/F1),
the condenser fan will modulate to the minimum condenser fan
output value. Compressor E1/F1 for module 3 or 6 will then be
enabled.
If the current state is “compressors A, B, C, and D are active”
for modules 1, 2, 4, or 5, the compressors will modulate to the
minimum position, wait for the minimum run time to be met,
and then will turn o. The compressors will then be disabled and
turn o. Once the minimum o time has been met for modules
3 or 6 rst compressor (E1/F1), the condenser fan will modulate
to the minimum condenser fan output value. Compressor E1/F1
for module 3 or 6 will then be enabled.
If the current state is “all VFD”, and E1/F1 are active, module
3 or module 6 will wait for the minimum o time to be met for
module 3 or 6 compressor E2/F2. Compressor E2/F2 will then
be enabled.

16 RSMZ Technical Guide
SEQUENCE OF OPERATIONS
Alarms
Alarm Detection and Reporting
The RSMZ continuously performs self diagnostics during normal
operation to determine if any operating failures have occurred.
These failures (alarms) will be reported to the AAON unit
controller which allows them to be monitored via a BACnet®
Building Automation System or with a user interface.
The following are the available alarm designations with detailed
descriptions for the RSMZ.
Alarm Warnings
Low Suction Pressure Warning
Low Suction Pressure will be ignored for the rst minute of initial
compressor operation. If Suction Pressure is below 95 psig for
20 seconds, the VFD compressor will modulate down 1% per
second. This warning will clear once the Suction Pressure rises
above 95 psig.
Low Suction Pressure – Startup Warning
The initial compressor on the circuit cannot start unless the
Suction Pressure is at least 120 psig. A warning will occur if
the circuit is o and the Suction Pressure drops below120 psig.
High Discharge Pressure – Level 1 Warning
If the Discharge Pressure rises above 540 psig, the condenser
fan will be forced to 100%. The VFD compressor will limit the
minimum and maximum RPM limits from 1800 rpm to 5400
rpm, according to envelope protection.
High Discharge Pressure – Level 2 Warning
If the Discharge Pressure rises above 575 psig, the VFD
compressor will modulate down 1% per second until the
Discharge Pressure drops below 475 psig.
Discharge Pressure Not Detected Warning
If the Discharge Pressure Transducer is not detected and a
compressor is running, the condenser fan will be forced to 100%.
Danfoss VFD Alarms Warning
If an alarm occurs from the VFD compressor, the Danfoss Alarm
Menu screens will show information on what the alarm code is.
The screens break up the alarms into bytes. If a display is not
installed on the VFD, these alarm bytes will aid in knowing which
specic alarm has occurred.
Parameter 16-90 Alarm Word 1
“DNFSALM1”
Parameter 16-90, alarm bits 0 – 7
“DNFSALM1”, “B1 ###”
Parameter 16-90, alarm bits 8 – 15
“DNFSALM1”, “B2 ###”
Parameter 16-90, alarm bits 16 – 23
“DNFSALM1”, “B3 ###”
Parameter 16-90, alarm bits 24 – 31
“DNFSALM1”, “B4 ###”
Same with Parameter 16-91 Alarm Word 2
“DNFSALM2”
There are two alarm parameters from the VFD 16-90 and 16-91.
Each contain 32 dierent alarms as a binary biteld, each bit
is a specic alarm. Refer to Danfoss “Operating Instructions”
“VLT Compressor Drives CDS 302/CDS 303” that is provided
with the unit.
High Superheat Warning
A high superheat warning will occur if a compressor is active and
the superheat is above 25ºF for two minutes or longer.
High Discharge Line Temperature
This sensor is installed for modulating VFD compressors
only. If the Discharge Line Temperature rises above 260ºF, the
VFD compressor will modulate down 1% per second until the
Discharge Line Temperature drops below 260ºF.
Compressor 1 False Active Warning
This warning will occur if Compressor 1 is not activated and
the running verication signal is active for at least 45 seconds.
For Danfoss VFD compressors, the running verication is sent
from Modbus Communications. For xed On/O compressors,
the running verication is a binary input signal to the module.
Compressor 2 False Active Warning
This warning will occur if Compressor 2 is not activated and
the running verication signal is active for at least 45 seconds.
For Danfoss VFD compressors, the running verication is sent
from Modbus Communications. For xed On/O compressors,
the running verication is a binary input signal to the module.
Discharge Line Temp Sensor Not Detected
This warning will occur if the Discharge Line Temperature Sensor
is not detected by the module.

17
RSMZ Technical Guide
SEQUENCE OF OPERATIONS
Alarm Faults
Alarm Faults
Low Suction Pressure Fault
Low Suction Pressure will be ignored for the rst minute of
initial compressor operation. If Suction Pressure is below 95
psig for one minute, the compressor will be turned o and will
be retried after ve minutes.
Compressor 2 Low Suction Pressure Fault
Low Suction Pressure will be ignored for the rst minute of initial
compressor operation. For tandem circuits, if both compressors
are running and Suction Pressure is below 95 psig for one minute,
the second compressor will be turned o and will be retried after
ve minutes.
Unsafe Suction Pressure Fault
Unsafe Suction Pressure Detection will be ignored for the rst 30
seconds of initial compressor operation. If the Suction Pressure
drops below 50 psig for ve seconds, the compressor(s) will be
turned o and will be retried after ve minutes.
High Discharge Pressure Fault
On a single compressor circuit, if the Discharge Pressure rises
above 600 psig, the compressor will be turned o and will be
retried after ve minutes. The compressor will not be reactivated
until the pressure rises above 475 psig.
Compressor 2 High Discharge Pressure Fault
On a tandem compressor circuit, if the Discharge Pressure rises
above 575 psig and both compressors are running, the second
compressor will be turned o and will be retried after ve
minutes.
Compressor 1 Not Running Fault
If Compressor 1 has been activated for at least 45 seconds and
the running verication signal is not active, the compressor
signal will be turned o and will be retried after ve minutes.
For Danfoss VFD compressors, the running verication is sent
from Modbus Communications. For xed On/O compressors,
the running verication is a binary input signal to the module.
Compressor 2 Not Running Fault
If Compressor 2 has been activated for at least 45 seconds and
the running verication signal is not active, the compressor signal
will be turned o and will be retried after ve minutes. For xed
On/O compressors, the running verication is a binary input
signal to the module.
Low Superheat Fault
The low superheat detection will be ignored for the rst two
minutes of initial compressor operation. If the superheat drops
below 4ºF for two minutes, the compressor signal will be turned
o and will be retried after ve minutes.
High Discharge Line Temperature
This sensor is installed for modulating VFD compressors
only. If the Discharge Line Temperature rises above 260ºF, the
VFD compressor will modulate down 1% per second until the
Discharge Line Temperature drops below 260ºF.
If the compressor modulates down to 1800 rpm, the compressor
will be turned o and will be retried if the Discharge Line
Temperature drops below 150ºF and ve minutes has lapsed.
DMQ EXV Sensor Not Detected Fault
If the DMQ EXV Superheat Controller is not detected through
Modbus communications for one minute, the compressor(s) will
be turned o. This fault will be cleared when communication
is reestablished.
Communications Loss Fault
If E-BUS communications are lost for at least 15 seconds, the
compressor(s) will be turned o. If the module is controlling a
Danfoss VFD compressor and the Modbus communication to
the Danfoss VFD compressor is lost for at least 15 seconds, the
compressor will be turned o. This fault will be cleared when
communication is reestablished.
High Superheat Fault
If a compressor is active and the superheat is above 30ºF for 10
minutes or longer, the compressor(s) will be turned o and will
be retried after ve minutes.
High Evaporator Saturation Temperature
Fault
On a tandem circuit, both compressors have to be running to
trigger a fault. A modulating VFD compressor has to be at 100%
to trigger a fault. If the Evaporator Saturation Temperature
rises above 59ºF for the stage up delay plus two minutes, the
compressor will be turned o and will be retried after ve
minutes.

18 RSMZ Technical Guide
SEQUENCE OF OPERATIONS
Alarm Lockouts
Alarm Lockouts
Low/Unsafe Suction Pressure Lockout
If a low Suction Pressure fault or unsafe Suction Pressure fault
occurs three times in a two-hour time period, the circuit will be
disabled and locked out until the module is reset.
Low Refrigerant Oil Level Lockout
If an oil boost cycle is performed and the oil level is not detected
for one minute, the circuit will be disabled and locked out until
the module is reset.
High Discharge Pressure Lockout
If a high Discharge Pressure fault occurs three times in a two-
hour time period, the circuit will be disabled and locked out until
the module is reset.
Low Superheat Lockout
If a low superheat fault occurs three times in a two-hour time
period, the circuit will be disabled and locked out until the
module is reset.
High Superheat Lockout
If a high superheat fault occurs three times in a two-hour time
period, the circuit will be disabled and locked out until the
module is reset.
High Evaporating Temperature Lockout
If a high evaporating temperature fault occurs three times in a
two-hour time period, the circuit will be disabled and locked out
until the module is reset.
High Discharge Line Temperature Lockout
If a high Discharge Line Temperature fault occurs three times in
a two-hour time period, the circuit will be disabled and locked
out until the module is reset.

19
RSMZ Technical Guide
SEQUENCE OF OPERATIONS
Subcool Monitor Module Operation
Subcool Monitor Module Operation
The Subcool Monitor Module is a monitoring-only module. It
is capable of monitoring the subcooling for up to three circuits,
simultaneously. The use of the Subcool Monitor Module is
optional.
Subcooling Sequence
The Subcool Monitor Module reads and scales all of its six
inputs and calculates the saturated suction and subcooling for
each congured circuit.

20 RSMZ Technical Guide
LCD SCREENS
LCD Display Screen and Navigation Keys
LCD Display Screen & Navigation Keys
The LCD display screens and buttons allow you to view status
and alarms, and enable force modes. See Figure 8, this page
and refer to Table 5 and Table 6, this page for key functions.
ALARM
UP
DOWN
ENTERMENU
Figure 8: LCD Display and Navigation Keys
Navigation
Key Key Function
MENU Use the MENU key to move through screens
within Main Menu categories and return to the
Main Menu while at other screens.
UP Use this key to adjust setpoints and change
congurations.
DOWN Use this key to adjust setpoints and change
congurations.
ENTER Use the ENTER key to navigate through the
Main Menu Screen categories.
Table 5: Navigation Key Functions
Table 6: Editing Key Functions
Editing
Key Key Function
UP
or
DOWN
Use the UP or DOWN key to enter editing mode on
a user-adjustable screen. Edit Mode is indicated
by the underscore appearing on the screen.
NOTE: Entering Edit Mode will also adjust the
value up one (UP key) or down one (DOWN key),
so you may have to readjust the value.
ENTER Use the ENTER key to move through the digits
in the screen when editing a numeric value. An
extended press of the ENTER key saves your
edits no matter the location of the editing cursor
within the digits.
Press the ENTER key to save a non-numeric value
such as Hi Speed Network.
MENU The MENU key cancels editing when in Edit Mode.
The screen you were editing will return to its
original value and the underscore will disappear.
A second press of the MENU key will return you to
the Main Menu.