AAON RSMVQ2R Quick start guide

RSMVQ2R
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: G068360, Rev A
Copyright March 2021 AAON, Inc.
AAON®is a registered trademark of AAON, Inc., Tulsa, OK.
Copeland Digital Scroll™ is a registered trademark of
Copeland Corporation, Sidney, OH
Danfoss VFD®is a registered trademark of Danfoss
Commercial Compressors, S.A., Tallahassee, FL
RSMVQ2R REVISION LOG
REVISION & DATE CHANGE
Rev. A March 28, 2021 Original
www.aaon.com
RSMVQ2R PARTS REFERENCE
PART DESCRIPTION PART NUMBER
RSMVQ2R ASM02652
VCCX2 Controller ASM01698
Prism 2 ASM02533
IP Module Kit ASM01902
CommLink 5 ASM01874
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 Foot 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)
Modular Service Tool SD - Operator Interface ASM01895
All manuals are also available for download from
www.aaon.com/controlsmanuals.

3
RSMVQ2R Technical Guide
TABLE OF CONTENTS
OVERVIEW....................................................................................................................... 5
RSMVQ2R Overview ............................................................................................................................................. 5
RSMVQ2R Dimensions ......................................................................................................................................... 6
INSTALLATION AND WIRING......................................................................................... 7
Electrical and Environmental Requirements ........................................................................................................... 7
WIRING ............................................................................................................................ 8
RSMVQ2R Inputs Wiring ....................................................................................................................................... 8
RSMVQ2R Outputs Wiring .................................................................................................................................... 9
INPUTS AND OUTPUTS................................................................................................ 10
RSMVQ2R Module Inputs/Outputs Map .............................................................................................................. 10
RSMVQ2R Inputs and Outputs.............................................................................................................................11
SEQUENCE OF OPERATIONS....................................................................................... 12
Cooling Mode, Dehumidication, and Head Pressure Control.............................................................................. 12
Envelope Protection.............................................................................................................................................. 13
Electronic Expansion Valve Operation and Head Pressure Control ..................................................................... 14
LCD SCREENS ............................................................................................................... 15
LCD Display Screen and Navigation Keys............................................................................................................ 15
Main Screens Map ................................................................................................................................................ 16
Module Screens .................................................................................................................................................... 17
System Status Screens......................................................................................................................................... 18
Sensor Status Screens ......................................................................................................................................... 19
Alarms Screens..................................................................................................................................................... 20
Alarm History Screens .......................................................................................................................................... 21
Setpoint Status Screens ....................................................................................................................................... 22
Copeland Packaged VFD Screens ....................................................................................................................... 23
Danfoss VFD Screens .......................................................................................................................................... 24
Copeland VFD Screens ........................................................................................................................................ 26
Copeland VFD Screens and DMQ EXV Screens ................................................................................................. 27
TROUBLESHOOTING .................................................................................................... 28
LED Diagnostics ................................................................................................................................................... 28
Temperature Sensor Testing ................................................................................................................................. 29
Head Pressure Transducer ................................................................................................................................... 30
APPENDIX A: SYSTEM CONFIGURATION ................................................................... 31
Single Condenser Per Module A........................................................................................................................... 31
Two Condensers Per Module A............................................................................................................................. 32
Compressor Type Selection .................................................................................................................................. 33
Unit Tonnage Selection and Compressor Type Specication Table...................................................................... 34

4RSMVQ2R Technical Guide
FIGURES AND TABLES
TABLES
Table 1: RSMVQ2R Controller Electrical and Environmental Requirements..................................................................7
Table 2: RSMVQ2R Inputs and Outputs ............................................................................................................................10
Table 3: Compressor Speed / Head Pressure ...................................................................................................................14
Table 4: Navigation Key Functions.......................................................................................................................................15
Table 5: Editing Key Functions .............................................................................................................................................15
Table 6: 0-5V Temperature Sensor - Voltage & Resistance for Type III Sensors .........................................................29
Table 7: Head Pressure Transducer Chart .........................................................................................................................30
Table 8: Compressor Type Specication Table ..................................................................................................................34
FIGURES
Figure 1: RSMVQ2R Dimensions ............................................................................................................................................6
Figure 2: RSMVQ2R Inputs Wiring..........................................................................................................................................8
Figure 3: RSMVQ2R Outputs Wiring.......................................................................................................................................9
Figure 4: Danfoss VZH028, VZH035, VZH044 Envelope .................................................................................................13
Figure 5: Danfoss VZH052 and VZH065 Envelope ............................................................................................................13
Figure 6: Copeland ZPV0662E Envelope.............................................................................................................................13
Figure 7: Copeland ZPV0962E Envelope.............................................................................................................................13
Figure 8: LCD Display and Navigation Keys........................................................................................................................15
Figure 9: RSMVQ2R LED Locations .....................................................................................................................................28
Figure 10: Prims 2 Single Condenser Module A Conguration ...........................................................................................31
Figure 11: Prims 2 Two Condensers Module A Conguration.............................................................................................32
Figure 12: RSMVQ2R Module A Compressor Type..............................................................................................................33
Figure 13: Miscellaneous Setpoints Screen - Copeland Model Selection.........................................................................33
Figure 14: Update Copeland.....................................................................................................................................................33
Figure 15: RSMVQ2R Unit Tonnage Selection......................................................................................................................34

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 congurations:
1. Must have second circuit reheat and no reheat on the
rst circuit.
2. Must have one MODBUS-controlled VFD compressor
on the rst circuit.
3. Must have a xed or two-step compressor on the
second circuit.
4. Must have at least one DMQ EXV.
Optional congurations 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 congured 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
Dehumidication 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 congurations, sensors, alarms, and
to change the module’s address, if necessary.

6RSMVQ2R Technical Guide
OVERVIEW
RSMVQ2R Dimensions
Figure 1: RSMVQ2R Dimensions
6.10
2.05 2.05
4.10
5.61 4.98
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02652
+24 VAC
GND
RELAYCONTACT
RATING IS 1AMP
MAX @ 24 VAC
CONDENSER 1
COMP 2 ENABLE
COMP 2 HI SPEED
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G068350
COND FAN 1
COND FAN 2
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
CONDENSER 2
+5 V
DISCHARGE TEMP 1
COMP STAT 1
H1P
SATURATION TEMP 2
COMP STAT 2
GND
NOT USED
GND
NOT USED
GND
BINARYINPUTS
MODBUS
RSMVQ2R
www.aaon.com
HEAD
PRESSURE
SENSORS
DUAL
E-BUS
EXP VALVE1
+5 V
H2P
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
ELECTRICALLYISOLATED
NOT USED

7
RSMVQ2R Technical Guide
INSTALLATION AND WIRING
Electrical and Environmental Requirements
General
Correct wiring of the main unit controller and its modules is the
most important factor in the overall success of the controller
installation process. The main 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 controller 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, RSMVQ2R, and any
associated module.
Please carefully read and apply the following information when
wiring the unit controller, RSMVQ2R, 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 HVAC 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 HVAC Unit Controller,
RSMVQ2Rs, 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)
RSMVQ2R
Controller
18-30VAC 18 -22°F to 158°F
-30ºC to 70ºC 0-95% RH
Inputs
Resistive Inputs require 10KΩ
Type 3 Thermistor
24VAC Inputs provide 4.7kΩ
Load
Outputs Relay Outputs: 1 Amp
maximum per output.
Table 1: RSMVQ2R Controller Electrical and
Environmental Requirements

8RSMVQ2R Technical Guide
WIRING
RSMVQ2R Inputs Wiring
RSMVQ2R Wiring
The RSMVQ2R connects to the VCCX2 Controller using an
EBC E-BUS cable. 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 uses four analog inputs, two binary inputs, four
relays, and two analog outputs. See Figure 2, this page for inputs
wiring and Figure 3, page 9 for outputs wiring.
Head Pressure Control
The RSMVQ2R can monitor the Head Pressure Transducers and
control Condenser Fans to maintain a Head Pressure Setpoint.
The Condenser Fans will be controlled with a 0-10 VDC output
signal.
Condenser and Compressor Conguration
Options
Please see pages 31-34 for Condenser and Compressor
Conguration details.
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.
Expansion modules must be wired in such
a way that the expansion modules and the
controller are always powered together. Loss
of power to the expansion module will cause
the controller to become inoperative until
power is restored to the expansion module.
Figure 2: RSMVQ2R Inputs Wiring
18-30
VAC
GND
Line
Voltage
Size transformer for
correct total load.
RSMVQ2R = 18 VA
HP
GND
+V
BK
RD
WH
COMP STAT 1
COMP STAT 2
BIN1
BIN2
GND
COM
+
Condenser Fan 2
AOUT1
AOUT2
COM
+
Condenser Fan 1
TEMP 1
TEMP 2
GND
HP
GND
+V
BK
RD
WH
Head Pressure
Sensor
(by others)
Head Pressure
Sensor
(by others)
Discharge Temp
Sensor 1
Saturation Temp
Sensor 2
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02652
+24 VAC
GND
RELAYCONTACT
RATING IS 1AMP
MAX @ 24 VAC
CONDENSER 1
COMP 2 ENABLE
COMP 2 HI SPEED
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G068350
COND FAN 1
COND FAN 2
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
CONDENSER 2
+5 V
DISCHARGE TEMP 1
COMP STAT 1
H1P
SATURATION TEMP2
COMP STAT 2
GND
NOT USED
GND
NOT USED
GND
BINARYINPUTS
MODBUS
RSMVQ2R
www.aaon.com
HEAD
PRESSURE
SENSORS
DUAL
E-BUS
EXP VALVE1
+5 V
H2P
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
NOT USED

9
RSMVQ2R Technical Guide
WIRING
RSMVQ2R Outputs Wiring
Figure 3: RSMVQ2R Outputs Wiring
18-30 VACGND
Line
Voltage
NOTE:
All relay outputs are normally open
and rated for 24 VAC power only.
1 amp maximum load.
COMPRESSOR 2 HI SPEED
COMPRESSOR 2 ENABLE
24 VAC ONLY
CONDENSER 1 ENABLE
Connect to
VCCX2
Controller
1
Copeland VFD
Drive Board
23
456
R+ to PIN 1
T- to PIN 4
SH to PIN 5
DMQ USHX
Superheat Controller’s
MODBUS Terminal
R+
SH
T-
R+
SH
T-
DMQ USHX
Superheat Controller’s
MODBUS Terminal
CONDENSER 2 ENABLE
Copeland
Packaged VFD Danfoss VFD
T- to Term 69
SH to Term 61
4561 2378
RS-485
Interface
69 68 61
Ground shield
wire on one end
4561 2378 4561 2378
R+ to Term 68
RED
GRN
BLK
RED
GRN
BLK
ALARM
UP
DOWN
ENTERMENU
AAON P/N: ASM02652
+24 VAC
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER 1
COMP 2 ENABLE
COMP 2 HI SPEED
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G068350
COND FAN 1
COND FAN 2
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
CONDENSER 2
+5 V
DISCHARGE TEMP1
COMP STAT 1
H1P
SATURATION TEMP2
COMP STAT 2
GND
NOT USED
GND
NOT USED
GND
BINARY INPUTS
MODBUS
RSMVQ2R
www.aaon.com
HEAD
PRESSURE
SENSORS
DUAL
E-BUS
EXP VALVE1
+5 V
H2P
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
NOT USED
RLY1
RLY2
COMM
RLY3
RLY4
R+ to PIN 2
T- to PIN 7
SH to PIN 3
Ground shield
wire on one end

10 RSMVQ2R Technical Guide
INPUTS AND OUTPUTS
RSMVQ2R Module Inputs/Outputs Map
Inputs/Outputs Map
See Table 2, this page for the RSMVQ2R inputs and outputs.
Table 2: RSMVQ2R Inputs and Outputs
REFRIGERATION SYSTEM MODULE
FOR VFD HEAT PUMP COMPRESSORS
Analog Inputs
1Head Pressure Sensor 1 (HP1)
2Head Pressure Sensor 2 (HP2)
3Discharge Temperature 1 (TEMP1)
4Saturation Temperature 2 (TEMP2)
5-6 Not Used (TEMP3) (TEMP4)
Binary Inputs
1Compressor Status 1 (BIN1)
2Compressor Status 2 (BIN2)
3Not Used (BIN3)
4Not Used (BIN4)
Analog Outputs (0-10 VDC)
1Condenser Fan 1 (AOUT1)
2Condenser Fan 2 (AOUT2)
DMQ EXV COMM Ports
1Expansion Valve 1 (EXV-1)
2Expansion Valve 2 (EXV-2)
3Not Used (EXV-3)
4Not Used (EXV-4)
Binary Outputs (24 VAC)
1Compressor 2 Enable Relay (RLY1)
2Compressor 2 High Speed Relay (RLY2)
3Condenser 1 Enable Relay (RLY3)
4Condenser 2 Enable Relay (RLY4)
Communication Terminals
DUAL
E-BUS 2 EBC E-BUS Ports
MODBUS MODBUS Communication Terminal Block

11
RSMVQ2R Technical Guide
INPUTS AND OUTPUTS
RSMVQ2R Inputs and Outputs
RSMVQ2R Inputs & Outputs
+5 VDC Power
This output is a 5 VDC output that supplies power to the Head
Pressure Transducer 1.
HP1 - Head Pressure Transducer 1
The Head Pressure Transducer is used to measure Head Pressure
at the discharge line. This Head Pressure is used to drive
Condenser Fan 1 to maintain a given Head Pressure Setpoint.
+5 VDC Power
This output is a 5 VDC output that supplies power to the Head
Pressure Transducer 2.
HP2 - Head Pressure Transducer 2
The Head Pressure Transducer is used to measure Head Pressure
at the discharge line. This Head Pressure is used to drive
Condenser Fan 2 to maintain a given Head Pressure Setpoint.
TEMP1 - Discharge Temperature Sensor 1
Input
This Sensor is the Discharge Line Temperature Sensor for Circuit 1.
It is the G010470 Thermistor 10K ohm strap-on pipe sensor.
It is strapped to the discharge line immediately after the VFD
compressor and is used as a safety against high compressor
temperatures. Units with Copeland VFDs have the Discharge
Line Temperature Sensor wired directly to the drive. Units with
Danfoss VFDs will have a Discharge Line Temperature Sensor
wired to TEMP 1 of the RSMVQ2R.
TEMP2 - Saturation Temperature Sensor 2
Input
This Sensor is the Suction Saturation Temperature Sensor for
Circuit 2. It is the G049490 Thermistor 10K strap-on pipe sensor.
It is strapped to the evaporator coil immediately after TXV and
is used to measure the suction saturation temperature of the
second circuit.
BIN1 - Compressor Status 1
When this wet contact input closes, a 24 volt signal to Binary
Input #1 indicates that Compressor 1 is running. Typically, the
source for this is a relay output from the VCCX2. If Binary Input 1
opens, a Compressor alarm will be generated. Compressor 1
relay needs to be congured on the VCCX2 as “A1 Compressor
Run Status.”
BIN2 - Compressor Status 2
When this wet contact input closes, a 24 volt signal to Binary
Input #2 indicates that Compressor 2 is running. Typically, the
source for this is a relay output from the auxiliary contact on
the compressor starter. If Binary Input 2 opens, Compressor 2
Enable relay and Compressor 2 High Speed Enable relay will
de-energize and a Compressor Alarm will be generated.
NOTE: The Binary Inputs require wet contacts (24 VAC
only) to recognize an active input. If you provide
dry contacts, the contact closure will not be
recognized.
AOUT1 - Condenser Fan 1 VFD Signal
This is a direct acting output signal that is used to modulate the
Condenser Fan 1 VFD (0-10 VDC signal) on an Air Cooled unit.
AOUT2 - Condenser Fan 2 VFD Signal
This is a direct acting output signal that is used to modulate the
Condenser Fan 2 VFD (0-10 VDC signal) on an Air Cooled unit.
EXV-1
The Electronic Expansion Valve 1 is the communications port
for DMQ EXV setpoints and status communications.
EXV-2
The Electronic Expansion Valve 2 is the communications port
for DMQ EXV setpoints and status communications.
RLY1 - Compressor 2 Enable
This relay turns on Compressor 2.
RLY2 - Compressor 2 High Speed Enable
This relay enables high speed on Compressor 2.
RLY3 - Condenser 1 Enable
This relay turns on the Condenser Fan 1.
RLY4 - Condenser 2 Enable
This relay turns on the Condenser Fan 2.

12 RSMVQ2R Technical Guide
SEQUENCE OF OPERATIONS
Cooling Mode and Dehumidication Operation
Cooling Mode Operation
Cooling mode control staging is determined by the supply air
temperature. Staging is met by turning the on/o compressor on
or o and the two-step compressor to low speed or high speed.
Compressor modulation (VFD) is determined from saturation
temperature and supply air temperature. If the supply AND
saturation temperature are above setpoint, the compressors will
modulate up. If the supply OR saturation temperature are below
setpoint, the compressors will modulate down. Envelope and/or
current protections also aect the VFD compressor modulation.
Staging Up
1. If the supply air temperature is above the setpoint,
Compressor 1 VFD will turn on at the recommended
manufacturer’s specified speed for one minute.
Compressor 1 VFD will modulate anytime thereafter
if it is running.
2. If the supply air temperature is above the setpoint
plus window, and Compressor 1 VFD is at 100% of
its capacity, Compressor 2 will turn on at low speed
and Compressor 1 will be reset to 67% of its range
(min to max).
3. If the supply air temperature is above the setpoint
plus window, and Compressor 1 VFD is at 100% of
its capacity, Compressor 2 will be set to high speed
and Compressor 1 will be reset to 67% of its range
(min to max).
Staging Down
1. If the supply air temperature is below the setpoint
plus window and Compressor 1 VFD is at minimum
capacity, Compressor 2 will be set to low speed and
Compressor 1 will be reset to 67% of its range (min
to max).
2. If the supply air temperature is below the setpoint
plus window, and Compressor 1 VFD is at minimum
capacity, Compressor 2 will be turned off and
Compressor 1 will be reset to 67% of its range (min
to max).
3. If the supply air temperature is below the setpoint
plus window, and Compressor 1 VFD is at minimum
capacity, Compressor 1 will be turned o.
4. If the supply air temperature rises above the setpoint
and Compressor 1 VFD’s minimum o time has been
met, Compressor 1 will be turned back on.
Dehumidication Operation
Dehumidication Mode control staging/modulation is determined
by using the lowest saturation temperature from each circuit.
Circuit 1 uses DMQ saturation temperature and Circuit 2 uses
the saturation coil temperature sensor (Temp 2 input) mounted
after the TXV.
Staging Up
1. Staging begins when the module obtains the Reheat
Valve position and Reheat Supply Air Error from the
main unit controller (VCCX2). Compressor 2 will
turn on at low speed.
2. If the saturation temperature (lowest of both circuits’
readings) is above the setpoint plus window,
Compressor 1 VFD will turn on at the recommended
manufacturer’s specified speed for one minute.
Compressor 1 VFD will modulate any time thereafter
based on the saturation temperature (lowest of both
circuit’s readings).
3. If the saturation temperature of Circuit 2 is above the
setpoint plus window, Compressor 1 VFD is at 67% of
its range min to max, the reheat valve is at 100%, and
the supply air temperature is below the reheat setpoint,
Compressor 2 will be set to high speed.
Staging Down
1. If the saturation temperature of Circuit 2 is below the
setpoint plus window, Compressor 1 VFD is below
50% (adjustable), and the reheat valve is below 50%,
Compressor 2 will be set to low speed.
2. If the saturation temperature of Circuit 1 is below the
setpoint plus window and Compressor 1 VFD is at
minimum, Compressor 1 will be staged o.
Compressor 2 cannot be turned o in Dehumidication Mode
unless failed on safety.

13
RSMVQ2R Technical Guide
SEQUENCE OF OPERATIONS
Envelope Protection
Envelope Protection
The minimum operating speed reference is read from the VFD
and can change depending on where the compressor is operating
within its envelope.
The VFD compressor is set to 67% at any stage event. Therefore,
whenever a staging event occurs, the VFD compressor position
will be reset to the middle point of the modulation range. This
allows the compressor enough modulation time before making
another staging event to try to avoid cycling between staging
events.
Figure 4: Danfoss VZH028, VZH035, VZH044
Envelope
Figure 5: Danfoss VZH052 and VZH065 Envelope
Figure 6: Copeland ZPV0662E Envelope
Figure 7: Copeland ZPV0962E Envelope

14 RSMVQ2R Technical Guide
SEQUENCE OF OPERATIONS
Electronic Expansion Valve Operation and Head Pressure Control
Electronic Expansion Valve (EXV)
Operation
EXV operation is fully integrated into the DMQ EXV controller.
The DMQ EXV controller will measure suction pressure and
temperature to determine superheat and will automatically
modulate the EXV to maintain the congured superheat. The
RSMVQ2R will communicate with the DMQ controller to set
the desired superheat setpoint and to retrieve operational data
for display and trending purposes.
Head Pressure Control
The RSMVQ2R can monitor a head pressure transducer and
control a condenser fan to maintain a head pressure setpoint.
A condenser relay is commanded on when the rst compressor
is enabled. The condenser fan will be controlled with a 0-10
VDC output signal. When the condenser signal rst activates, it
maintains at 100% for 10 seconds.
In the Cooling Mode, the condenser signal will modulate to
maintain the cooling head pressure setpoint. The signal can
modulate between 15% and 100%. If the head pressure exceeds
550 PSIG, the condenser control signal will immediately go to
100% and a high head pressure alarm will be generated. The
alarm will be deactivated when the head pressure drops below
540 PSIG.
In the Dehumidication Mode, the condenser output signal
controls to the reheat head pressure setpoint. High head pressure
conditions produce the same eects as in the Cooling Mode.
If no head pressure sensor is detected, the condenser output signal
will be maintained at 100%.
During condenser fan head pressure control, the head pressure
setpoint will decrease when the VFD compressor speed
decreases. See Table 3, this page.
Compressor
Speed
Head Pressure Setpoint
(340 default - adjustable)
25% or lower 260 psi
25 - 100% 260 - 340 psi
100% 340 psi
Table 3: Compressor Speed / Head Pressure

15
RSMVQ2R 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 4 and Table 5, this page for key functions.
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.
ALARM
UP
DOWN
ENTERMENU
Figure 8: LCD Display and Navigation Keys
Table 4: Navigation Key Functions
Table 5: 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.

16 RSMVQ2R Technical Guide
LCD SCREENS
Main Screens Map
RSMVQ2R Main Screens Map
Refer to the following map when navigating through the LCD
Main Screens. To scroll through the screens, press the <MENU>
button.
RSMVQ2R
1124vXXX
Press to scroll through REFRIG MODULE screens.
Press to go to SYSTEM STATUS screens.
SYSTEM
STATUS
Press to scroll through SYSTEM STATUS screens.
Press to go to SENSOR STATUS screens.
SENSOR
STATUS
Press to scroll through SENSOR STATUS screens.
Press to go to ALARMS screens.
ALARMS
Press to scroll through ALARMS screens.
Press to go to ALARM HISTORY screens.
ALARM
HISTORY
Press to scroll through ALARM HISTORY screens.
Press to go to SETPOINT STATUS screens.
SETPOINT
STATUS
Press to scroll through SETPOINT STATUS screens.
Press to go to VFD MENU Screens.
Note: There are three separate VFD menus. The one that appears is
dependent on your unit’s conguration.
VFD
MENU
Press to scroll through VFD MENU Screens.
Press to go to EXV TYPE screens.
EXV TYPE
DMQ
Press to scroll through EXV TYPE screens.

17
RSMVQ2R Technical Guide
LCD SCREENS
Module Screens
RSMVQ2R
1124vXXX
E-BUS
+#
E-BUS COMMUNICATION DIAGNOSTICS
Number of COMM packets received.
SOFTWARE
1024vXXX
SOFTWARE VERSION
ADDRESS
#
CURRENT BOARD ADDRESS
SYS TYPE
COOL ONLY
CURRENT SYSTEM TYPE
COOL ONLY, or HEAT PUMP
#OF COMP
1 or 2
# OF COMPRESSORS
RSMVQ2R Module Screens
Refer to the following map when navigating through the
RSMVQ2R Screens. From the RSMVQ2R MODULE Screen,
press <ENTER> to scroll through the screens.
#OF EXVs
ISO-#
# OF EXPANSION MODULES
COMP A1=
FIXED OR MOD
COMPRESSOR 1 TYPE
COMP A2=
FIXED/TWO STEP
COMPRESSOR 2 TYPE
#OF COND
1 or 2
# OF CONDENSERS
TONNAGE
UNIT TONNAGE

18 RSMVQ2R Technical Guide
LCD SCREENS
System Status Screens
System Status Screens
Refer to the following map when navigating through the System
Status Screens. From the SYSTEM STATUS Screen, press
<ENTER> to scroll through the screens.
SYSTEM
STATUS
MODE
SYSTEM MODE
MIN RUN, OFF, COOLING, HEATING, DEHUM, or FORCED
COMP A1
ON/OFF or
MODULATING %
COMPRESSOR 1
ON/OFF or MODULATING %
FIXED ON/OFF: Compressor is on or o󰀨.
MODULATING %: 0-100%
COMP A2
ON/OFF or HI
SPEED/LO SPEED
COMPRESSOR 2
ON, OFF, HI SPEED, or LO SPEED
FIXED ON/OFF: Compressor is on or o󰀨.
TWO STEP: High Speed or Low Speed
CONDFAN1
OFF
CONDENSER 1
COND FAN, NOT USED, or OFF
COND FAN MODULATING PERCENTAGE: 0-100%
CONDFAN2
OFF
CONDENSER 2
COND FAN, NOT USED, or OFF
COND FAN MODULATING PERCENTAGE: 0-100%
EXV A1
0%
EXV VALVE POSITION
0-100%
EXV 2
0% or NOT USED
EXV VALVE 2 POSITION
0-100% or NOT USED

19
RSMVQ2R Technical Guide
LCD SCREENS
Sensor Status Screens
Sensor Status Screens
Refer to the following map when navigating through the Sensor
Status Screens. From the SENSOR STATUS Screen, press
<ENTER> to scroll through the screens.
SENSOR
STATUS
SUCTION
XXX PSIG
SUCTION PRESSURE READING FROM INPUT
HEAD PR1
XXX PSI
HEAD PRESSURE 1 READING FROM INPUT
HEAD PR2
XXX PSI
HEAD PRESSURE 2 READING FROM INPUT
SUPRHT 1
XX DEG
CURRENT SUPERHEAT 1 CALCULATION
SUPRHT 2
XX DEG
CURRENT SUPERHEAT 2 CALCULATION
DISCTEMP
XX DEG
DISCHARGE LINE TEMP 1 READING FROM INPUT
Only appears if congured for DANFOSS.
COIL 1
XX DEG
COIL TEMPERATURE 1
COIL 2
XX DEG
COIL TEMPERATURE 2
CALC CT
XX DEG
CALCULATED COIL TEMPERATURE
(Saturated Temperature)
SATCOIL2
XX DEG
SATURATION LINE: TEMP 2 READING FROM INPUT
Only appears if congured for two compressors/circuits.

20 RSMVQ2R Technical Guide
LCD SCREENS
Alarms Screens
Alarms Screen
If an alarm is present, the ALARM LED above the LCD display
will light up red and blink. The Alarms will display and scroll
automatically from the ALARMS screen when alarms are present.
NO ALARMS: This will be shown if there are no current alarms.
DMQ ALARMS: This will be shown if there are DMQ alarms.
EBUS SLAVE (SLV) TIMEOUT: This alarm indicates that
communication has been lost between the RSMVQ2R and the
Main controller. This can be the result of a bad cable, a missing
cable, or the module not being congured properly.
NO SUCTION PRESSURE SENSOR (SUCT) DETECTED: This
alarm indicates the Suction Pressure Sensor is not detected by
the system. The system will shut down due to Unsafe Suction
safety and will retry after ve minutes.
NO HEAD PRESSURE SENSOR (HEAD) DETECTED: This
alarm indicates the Head Pressure Sensor is not detected by the
system. This will cause the condenser to go to 100%.
COMPRESSOR (COMP) 1 FAULT: This alarm will occur if the
compressor fails to run 45 seconds after the relay is activated
or if the signal is lost after activation. This will cause an alarm
and will shut down the compressor (relay). The system will retry
after ve minutes.
COMPRESSOR (COMP) 2 FAULT: This alarm will occur if the
compressor fails to run 45 seconds after the relay is activated
or if the signal is lost after activation. This will cause an alarm
and will shut down the compressor (relay). The system will retry
after ve minutes.
HIGH HEAD PRESSURE (HP) DETECTED: This indicates a
High Head Pressure Alarm condition which is activated when
the Head Pressure rises above 550 PSIG. This will cause the
condenser to go to 100%.
LOW SUCTION PRESSURE FAILURE: This alarm will occur if
suction pressure stays below the low suction pressure setpoint for
one minute or falls below 40 psi for ve seconds. This alarm will
shut down the system. The system will retry after ve minutes.
LOW SUCTION PRESSURE (SP) DETECTED: This alarm will
occur if suction pressure falls below the low suction pressure
setpoint for 20 seconds. The system will try to protect by lowering
compressor modulation percentage.
LOW SUPERHEAT 1 (SH1) DETECTED: This alarm will be
activated when the Superheat is less than 4ºF for two minutes
during normal operation or four minutes during the rst 10
minutes. The system will shut down and will retry after ve
minutes.
LOW SUPERHEAT 2 (SH2) DETECTED: This alarm will be
activated when the Superheat is less than 4ºF for two minutes
during normal operation or four minutes during the rst 10
minutes. The system will shut down. The system will shut down
and will retry after ve minutes.
COIL 1 TEMP 1 FAILURE: This alarm will occur if the coil
temperature is not within operable range (below -32ºF or above
310ºF). This could be the result of a bad sensor or faulty wiring.
This alarm will shut down the system. The system will reset after
ve minutes if the sensor is detected.
COIL 2 TEMP 2 FAILURE: This alarm will occur if the coil
temperature is not within operable range (below -32ºF or above
310ºF). This could be the result of a bad sensor or faulty wiring.
This alarm will shut down the system. The system will reset after
ve minutes if the sensor is detected.
COMP VFD FAULT: This alarm will occur if the Copeland®VFD
compressor communicates through ModBus that it has shut down
due to a fault condition. The compressor module will attempt
to reset the fault after ve minutes if the compressor sends the
signal that it is okay to reset the fault.
HIGH SUPERHEAT 1 (SH1) WARNING: If Superheat 1 is above
25ºF for two minutes, this alarm will appear on the module only.
It will not be sent to the main controller to display on Prism 2.
HIGH SUPERHEAT 2 (SH2) WARNING: If Superheat 2 is above
25ºF for two minutes, this alarm will appear on the module only.
It will not be sent to the main controller to display on Prism 2.
HIGH SUPERHEAT 1 (SH1) FAILURE: If Superheat 1 is above
30ºF for 10 minutes, it will fail the compressors. It will retry
after ve minutes. If it fails twice in two hours, it will lock out
the compressors.
HIGH SUPERHEAT 2 (SH2) FAILURE: If Superheat 2 is above
30ºF for 10 minutes, it will fail the compressors. It will retry
after ve minutes. If it fails twice in two hours, it will lock out
the compressors.
HIGH SUPERHEAT LOCKOUT: If the module fails on High
Superheat twice in two hours, it will lock out the compressors.
MODBUS TIMEOUT: Indicates there is no communication
between the RSMVQ2R and Compressor VFD.
DANFOSS VFD: Indicates an alarm on the Danfoss VFD.
ALARMS