AAON RSMV ASM01686 Quick start guide

RSMV
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: V87390, Rev. 01D
© February 2021 AAON Inc. All rights reserved throughout
the world.
AAON®is a registered trademark of AAON, Inc., Tulsa, OK.
Copeland Scroll™ is a registered trademark of Emerson
Electric Co., Sidney, OH
AAON®assumes no responsibility for errors or omissions
in this document.
This document is subject to change without notice.
RSMV REVISION LOG
REVISION & DATE CHANGE
Rev. 01D, February 14, 2021
Updated part numbers, alarms and alarm history, Prism 2 Screens, and RSMV label.
Added gure/table content pages, part description table, and wiring consideration
content, and Fahrenheit/Celsius temperature conversion. Removed VFD test
screens.
This manual is also available for download from
—www.aaon.com/VCCX2 or www.aaon.com/
controlsmanuals, where you can always nd
the latest literature updates.
www.aaon.com
RSMV PARTS REFERENCE
PART DESCRIPTION PART NUMBER
Refrigerant System Module for VFD Compressors (RSMV) ASM01686
VCCX2 Controller ASM01698
AAON Unit Controller Varies
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

3
RSMV Technical Guide
TABLE OF CONTENTS
OVERVIEW....................................................................................................................... 5
RSMV Overview...................................................................................................................................................... 5
RSMV Dimensions.................................................................................................................................................. 6
INSTALLATION AND WIRING......................................................................................... 7
Electrical and Environmental Requirements .......................................................................................................... 7
WIRING ............................................................................................................................ 8
RSMV Inputs Wiring................................................................................................................................................ 8
RSMV Outputs Wiring............................................................................................................................................. 9
INPUTS AND OUTPUTS................................................................................................ 10
RSMV Module Inputs/Outputs Map ...................................................................................................................... 10
RSMV Inputs and Outputs .....................................................................................................................................11
SEQUENCE OF OPERATIONS....................................................................................... 12
Cooling Mode and Dehumidication Operation .................................................................................................... 12
Electronic Expansion Valve Operation and Head Pressure Control ..................................................................... 13
RSMV LCD SCREENS.................................................................................................... 14
LCD Display Screen and Navigation Keys............................................................................................................ 14
Main Screens Map and RSMV Module Screens................................................................................................... 15
System Status Screens......................................................................................................................................... 16
Sensor Status and Setpoint Status Screens......................................................................................................... 17
Setpoint Status Screens and Alarms Screen ........................................................................................................ 18
Alarm History and Protected Screens................................................................................................................... 19
Diagnostic Screens ............................................................................................................................................... 20
Diagnostic, Alarm Count, and Address Screens ................................................................................................... 21
TROUBLESHOOTING .................................................................................................... 22
RSMV LED Diagnostics ........................................................................................................................................ 22
Suction Pressure Transducer Testing ................................................................................................................... 23
Temperature Sensor Testing ................................................................................................................................. 24
Head Pressure Transducer ................................................................................................................................... 25
APPENDIX A: CONDENSER OPTIONS ......................................................................... 26
Single Condenser Conguration ........................................................................................................................... 26
APPENDIX B: PRISM 2 SYSTEM CONFIGURATION.................................................... 30
System Conguration............................................................................................................................................ 30

4RSMV Technical Guide
FIGURES AND TABLES
TABLES
Table 1: RSMV Controller Electrical and Environmental Requirements .................................................................. 7
Table 2: RSMV Inputs and Outputs ...................................................................................................................... 10
Table 3: Navigation Key Functions ........................................................................................................................ 14
Table 4: Coil Pressure/Voltage/Temp for Suction Pressure Transducers - R410A Refrigerant ............................. 23
Table 5: 0-5V Temperature Sensor - Voltage & Resistance for Type III Sensors .................................................. 24
Table 6: Head Pressure Transducer Chart ............................................................................................................ 25
FIGURES
Figure 1: Refrigerant System Module Dimensions ................................................................................................... 6
Figure 2: RSMV Inputs Wiring................................................................................................................................... 8
Figure 3: RSMV Outputs Wiring................................................................................................................................ 9
Figure 4: LCD Display and Navigation Keys ........................................................................................................... 14
Figure 5: RSMV LED Locations .............................................................................................................................. 22
Figure 6: Prism 2 Condenser Conguration - Single Condenser Per Module......................................................... 26
Figure 7: Prism 2 Condenser Conguration - Single Condenser Per Two Modules ............................................... 27
Figure 8: Prism 2 Condenser Conguration - Single Condenser for Three Modules.............................................. 28
Figure 9: Prism 2 Condenser Conguration - Single Condenser for Four Modules................................................ 29
Figure 10: Prism 2 RSMV Conguration Screen....................................................................................................... 30
Figure 11: RSMV Module A Compressor Type.......................................................................................................... 30

5
RSMV Technical Guide
OVERVIEW
RSMV Overview
RSMV Features & Application
The ASM01686 Refrigerant System Module for VFD Compressors
(RSMV) monitors and controls one refrigeration circuit of the HVAC
unit. The module is designed for R410-A refrigerant.
The RSMV is connected to the VCCX2 Controller or other AAON
Unit Controller. Up to 4 RSMV’s can be connected, depending on
the size of the system. There are 2 E-BUS Expansion Ports which
allow the use of communicating sensors and E-BUS Modules.
The RSMV provides 4 analog inputs, 3 binary inputs, 3 relays, and
4 analog outputs. See Figures 2 & 3, pages 8 & 9 for wiring.
The RSMV Module provides the following:
• Modulates the Compressors 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 to maintain the Head
Pressure Setpoint.
• Modulates the Expansion Valves to maintain the
Superheat Setpoint.
• Provides alarms and safeties for the compressor and
condenser operation.
• Provides a 2 x 8 LCD character display and 4 buttons that
allow for status of system operation, system setpoints,
system congurations, sensors, and alarms, and to change
the module’s address, if necessary.

6RSMV Technical Guide
OVERVIEW
RSMV Dimensions
Figure 1: Refrigerant System Module Dimensions
AAON P/N: ASM01686
+24 VAC
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER
COMP 1
COMP 2
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G042020
MOD COMP SIG
CONDENSER FAN SIG
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
NOT USED
+5 V
+5 V
COIL TEMP 1
COMP STATUS 1
SP
HP
COIL TEMP 2
COMP STATUS 2
GND
GND
NOT USED
NOT USED
GND
TEMP 3
GND
COIL TEMP SENSORS
BINARY INPUTS
E-BUS
RSM FOR VFD COMPRESSORS
www.aaon.com
SUCTION PRESSURE SENSOR
HEAD PRESSURE SENSOR
E-BUS
EXPANSION
VALVE1
EXPANSION
VALVE2
WHITE
BLACK
RED
GREEN
WHITE
BLACK
RED
GREEN
ALARM
UP
DOWN
ENTERMENU
NOTE: All dimensions
are in inches.

7
RSMV 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
factory 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, below.
NOTE: Ifthetemperatureat thecontrollerisbelow-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, RSMV, and
any associated module.
Please carefully read and apply the following information when
wiring the Unit Controller, RSMV, 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 2-conductor wire and some require
3-or 4-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, 2-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,
RSMVs, 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)
RSMV
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: RSMV Controller Electrical and
Environmental Requirements

8RSMV Technical Guide
WIRING
RSMV Inputs Wiring
RSMV Wiring
The RSMV is connected to the VCCX2 Controller. Up to 4 RSMV’s
can be connected, depending on the size of the system. There are
2 E-BUS Expansion Ports which allow the use of communicating
sensors and E-BUS Modules.
The RSMV provides 4 analog inputs, 3 binary inputs, 3 relays, and
4 analog outputs. See Figure 2, below for inputs wiring and Figure
3,page 9 for outputs wiring.
Suction Pressure Sensor Wiring
The Suction Pressure Transducer must be wired as shown in Figure 2,
below. It is required for all compressorized VCCX2 applications.
The Suction Pressure Sensor is used to measure suction pressure
at the HVAC unit’s DX evaporator coil suction line. This suction
line pressure is converted to saturated refrigerant temperature by
the RSMV Controller. This temperature is used by the RSMV to
accurately control the Expansion Valves to maintain Superheat
to provide optimum performance of the system. The saturated
refrigerant temperature is used to properly control the compressors
to maintain a given Suction Coil (Saturated) Temperature Setpoint.
In Cooling and Heat Pump mode, the VCCX2 resets the Suction
Coil (Saturated) Temperature Setpoint to maintain a given supply air
temperature setpoint. In Dehumidication mode, the Suction Coil
(Saturated) Temperature Setpoint is a user congurable setpoint that
can be reset based on indoor humidity levels.
SP
GND
+V
BK
RD
WH
HP
GND
+V
BK
RD
WH
SP
S
UCTION RESSURE
ENSOR
HP
S
(BY OTHERS)
EAD RESSURE
ENSOR
REFRIGERANT SYSTEM MODULE
FOR VFD COMPRESSORS
(RSMV)
COIL (SUCTION LINE)
TEMP. 2 SENSOR
TEMP1
GND
TEMP2
COMPRESSOR STATUS 1
COMPRESSOR STATUS 2
BIN1
BIN2
18-30 VAC
GND
Line Voltage
Size Transformer For
Correct Total Load.
RSMV = 18 VA
GND
COIL (SUCTION LINE)
TEMP. 1 SENSOR
AAON P/N: ASM01686
+24 VAC
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER
COMP 1
COMP 2
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G042020
MOD COMP SIG
CONDENSER FAN SIG
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
NOT USED
+5 V
+5 V
COIL TEMP 1
COMP STATUS 1
SP
HP
COIL TEMP 2
COMP STATUS 2
GND
GND
NOT USED
NOT USED
GND
TEMP 3
GND
COIL TEMP SENSORS
BINARYINPUTS
E-BUS
RSM FOR VFD COMPRESSORS
www.aaon.com
SUCTION PRESSURE SENSOR
HEAD PRESSURE SENSOR
E-BUS
EXPANSION
VALV E1
EXPANSION
VALV E2
WHITE
BLACK
RED
GREEN
WHITE
BLACK
RED
GREEN
ALARM
UP
DOWN
ENTERMENU
Figure 2: RSMV Inputs Wiring

9
RSMV Technical Guide
WIRING
RSMV Outputs Wiring
Head Pressure Control
The RSMV can monitor a Head Pressure Transducer and control
Condenser Fans to maintain a Head Pressure Setpoint. The
Condenser Fan will be controlled with a 0-10 VDC output signal.
Coil Temperature Sensors
Coil Temperature Sensors are used to measure Coil Temperature
after each evaporator coil line. This temperature, combined with the
calculated saturated refrigerant temperature, is used to calculate the
Superheat of each individual evaporator coil. The Superheat is used
to drive the Expansion Valves to maintain a given Superheat Setpoint.
Condenser Conguration Options
Please see Appendix A,page 26 for Condenser Conguration
details.
CAUTION: The Shraeder port used for installation of the
suction pressure transducer should be located in
a vertical position of the suction line to prevent
refrigerant oil from accumulating in the sensor.
Figure 3: RSMV Outputs Wiring
18-30 VACGND
Line
Voltage
Size Transformer For
Correct Total Load.
RSMV = 18 VA
NOTE:
ALL RELAY OUTPUTS ARE NORMALLY
OPEN AND RATED FOR 24 VAC POWER
ONLY-1 AMP MAXIMUM LOAD
CONDENSER ENABLE
COMPRESSOR 2 ENABLE
COMPRESSOR 1 ENABLE
24 VAC ONLY
RLY1
RLY3
RLY2
COMM
RD
WH
BK
GRN
RD
WH
BK
GRN
EXPANSION
VALVE 1
EXPANSION
VALVE 2
COM
+
MODULATING
COMPRESSOR
COM
+
CONDENSER
FAN SIGNAL
AOUT1
AOUT2
GND
Connect to
VCCX2
Controller
AAON P/N: ASM01686
+24 VAC
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER
COMP 1
COMP 2
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G042020
MOD COMP SIG
CONDENSER FAN SIG
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
NOT USED
+5 V
+5 V
COIL TEMP 1
COMP STATUS 1
SP
HP
COIL TEMP 2
COMP STATUS 2
GND
GND
NOT USED
NOT USED
GND
TEMP 3
GND
COIL TEMP SENSORS
BINARYINPUTS
E-BUS
RSM FOR VFD COMPRESSORS
www.aaon.com
SUCTION PRESSURE SENSOR
HEAD PRESSURE SENSOR
E-BUS
EXPANSION
VALV E1
EXPANSION
VALV E2
WHITE
BLACK
RED
GREEN
WHITE
BLACK
RED
GREEN
ALARM
UP
DOWN
ENTERMENU

10 RSMV Technical Guide
INPUTS AND OUTPUTS
RSMV Module Inputs/Outputs Map
Inputs/Outputs Map
See Table 2, below for the RSMV inputs and outputs.
Table 2: RSMV Inputs and Outputs
RSMV Inputs/Outputs
Analog Inputs
1 Suction Pressure Sensor (SP)
2 Head Pressure Sensor (HP)
3 Coil (Suction Line) Temperature Sensor 1 (TEMP1)
4 Coil (Suction Line) Temperature Sensor 2 (TEMP2)
Binary Inputs
1 Compressor Status 1 (BIN1)
2 Compressor Status 2 (BIN2)
Analog Outputs (0-10 VDC)
1 Modulating Compressor (AOUT1)
2 Condenser Fan Signal (AOUT2)
Stepper Motor Outputs
1 Expansion Valve 1 (EXV-1)
2 Expansion Valve 2 (EXV-2)
Binary Outputs (24 VAC)
1 Compressor 1 Enable Relay (R1)
2 Compressor 2 Enable Relay (R2)
3 Condenser Enable Relay (R3)

11
RSMV Technical Guide
INPUTS AND OUTPUTS
RSMV Inputs and Outputs
RSMV - Inputs & Outputs
+5V VDC Power
This output is a 5 VDC output that supplies power to the Suction
Pressure Transducer.
SP - Suction Pressure Transducer
The Suction Pressure Sensor is used to measure suction pressure
at the HVAC unit’s DX evaporator coil suction line. This suction
line pressure is converted to saturated refrigerant temperature.
This temperature combined with the measured temperature of
the coil temperature sensors is used to calculate Superheat. The
Superheat is used to drive the Expansion Valves to maintain a
certain Superheat Setpoint. The saturated refrigerant temperature
is also used in the Dehumidication mode of operation to properly
control the compressors to maintain a given Suction Coil (Saturated)
Temperature Setpoint.
+5V VDC Power
This output is a 5 VDC output that supplies power to the Head
Pressure Transducer.
HP - Head Pressure Transducer
The Head Pressure Transducer is used to measure Head Pressure at
the discharge line. This Head Pressure is used to drive the Condenser
Fans to maintain a given Head Pressure Setpoint.
TEMP1 & TEMP2 - Coil (Suction Line)
Temperature Sensor 1 & Sensor 2 Input
These Sensors are used to measure the Coil (Suction Line)
Temperature after each evaporator coil line. This temperature
combined with the calculated saturated refrigerant temperature is
used to calculate the Superheat of each individual evaporator coil.
The Superheat is used to drive the Expansion Valves to maintain a
given Superheat Setpoint.
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 compressor VFD drive. If Binary
Input 1 opens, Compressor 1 Enable Relay will de-energize and a
Compressor Alarm will be generated.
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 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 - Modulating Compressor Signal
This 0-10 VDC output is used to control a Modulating Compressor
to maintain the Cooling Supply Air Temperature Setpoint.
AOUT2 - Condenser Fan VFD Signal
This is a direct acting output signal that is used to modulate the
Condenser Fan VFD (0-10 VDC signal) on an Air Cooled unit.
EXV-1
The Electronic Expansion Valve 1 is driven to maintain Superheat
for Evaporator Coil 1 of its particular refrigerant system.
EXV-2
The Electronic Expansion Valve 2 is driven to maintain Superheat
for Evaporator Coil 2 of its particular refrigerant system.
RLY1 - Compressor 1 Enable
This relay turns on the Modulating Compressor.
RLY2 - Compressor 2 Enable
This relay turns on the Fixed Compressor.
RLY3 - Condenser Enable
This relay turns on the Condenser Fan / Water Valve.

12 RSMV Technical Guide
SEQUENCE OF OPERATIONS
Cooling Mode and Dehumidication Operation
Cooling Mode Operation
In the Cooling Mode, as the Supply Air Temperature (SAT) rises
above the Active SAT Cooling Setpoint, the compressors will stage
on and modulate to maintain the Active Evaporator Coil Suction
(Saturated) Temperature Setpoint. One set of tandem compressors
(a VFD compressor and a xed stage compressor) are controlled
per RSMV. Multiple RSMVs are needed for multiple sets of tandem
compressors.
In units with one set of tandem compressors, if the VFD compressor
modulates to 100% and the SAT is still above the SAT Cooling
Setpoint for the Cooling Stage Up Delay, then the xed compressor
will stage on. The VFD compressor will then be allowed to modulate
as necessary to maintain the Active Evaporator Coil Suction
(Saturated) Temperature Setpoint. Minimum o times must also be
met before compressors can stage on.
Stage Down Compressors
If the VFD compressor(s) have modulated down to 30% for the Stage
Down Delay period and the SAT has fallen below the SAT Cooling
Setpoint minus the Stage Control Window, then the last compressor
to have staged on (VFD or Fixed) will stage o – assuming its
Minimum Run Time has been met. Any remaining VFD compressors
are then allowed to modulate as needed. If the last remaining VFD
compressor reaches 0% for the Stage Down Delay, it will stage o.
Dehumidication Operation
Once in Dehumidication Mode, units with xed compressors
will activate the compressors to maintain the Evaporator Coil
Suction (Saturated) Temperature Setpoint. An RSMV Module will
be required for each xed compressor or each xed compressor
tandem pair in order to monitor the suction (saturated) temperature
and control the compressor(s) accordingly. Each RSMV will
independently activate and stage its compressor(s) to maintain that
circuit’s Suction (Saturated) Temperature Setpoint. The staging of
compressors on an RSMV is subject to Stage Up and Stage Down
Delays as well as compressor Minimum Run Times and Minimum
O Times.
A suction pressure transducer is used and the VCCX2 Controller
converts that to a Suction (Saturated) Temperature value.
On units with one or more sets of VFD/Fixed tandem compressors,
each set of tandem compressors (one circuit) will be controlled by
a separate RSMV Module with its own Suction Pressure Transducer
(converted to a Suction (Saturated) Temperature). Once the unit
enters the Dehumidification Mode, each RSMV will initially
activate the VFD compressor as required to maintain the Suction
(Saturated) Temperature Setpoint. At that point, each RSMV will
modulate its VFD compressor and enable the xed compressor, as
necessary, to maintain the Suction (Saturated) Temperature Setpoint
for that circuit.
If the VFD compressor reaches 100% for the Stage Up Delay and
the Suction (Saturated) Temperature is still above setpoint, then the
xed compressor will stage on while the VFD compressor modulates
as needed. If the VFD compressor has modulated down to 0%
and the Suction (Saturated) Temperature is 5ºF below the Suction
(Saturated) Temperature for the Stage Down Delay period, the xed
compressor will stage o and the VFD compressor will continue to
modulate. During this operation, compressor Minimum Run Times
and Minimum O Times must be met.
NOTE: If the Coil Temperature drops below 32˚F, any
cooling remaining on will be forced to stage o.

13
RSMV Technical Guide
SEQUENCE OF OPERATIONS
Electronic Expansion Valve Operation and Head Pressure Control
Electronic Expansion Valve (EXV)
Operation
If EXV’s are being used, a Coil (Suction Line) Temperature Sensor
will measure the Coil (Suction Line) Temperature after each
Evaporator Coil line for each compressor, and this sensor will be
connected to an RSMV Module. This temperature will be used in
conjunction with the calculated saturated refrigerant temperature
to calculate the Superheat of each evaporator coil. The EXV for
each coil will then be controlled to maintain the Superheat Setpoint.
Head Pressure Control
The RSMV can monitor a Head Pressure Transducer and control a
Condenser Fan to maintain a Head Pressure Setpoint. The RSMV
must be congured for an Air Cooled Condenser.
A Condenser Relay is commanded on when the rst compressor is
enabled (except if the unit is in Heat Pump Defrost Mode). On an
Air Cooled Unit, the Condenser Fan will be controlled with 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%.

14 RSMV Technical Guide
RSMV 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 4, below and refer to
Table 3 for descriptions.
Figure 4: LCD Display and Navigation Keys
Table 3: Navigation 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

15
RSMV Technical Guide
RSMV LCD SCREENS
Main Screens Map and RSMV Module Screens
RSMV Main Screens Map
Refer to the following map when navigating through the LCD Main
Screens. To scroll through the screens, press the <MENU> button.
RSMV Module Screens
Refer to the following map when navigating through the RSMV
Screens. From the RSMV MODULE Screen, press <ENTER> to
scroll through the screens.
RSMV
1072vXXX
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.
RSMV
1072vXXX
E-BUS
#
E-BUS COMMUNICATION DIAGNOSTICS
Number of COMM packets received.
SOFTWARE
1072vXXX
CURRENT SOFTWARE VERSION
You can access the protected screens from this
screen by holding the <UP> button for 5 seconds.
ADDRESS
#
CURRENT BOARD ADDRESS
SYS TYPE
COOLONLY
CURRENT SYSTEM TYPE
#OF COMP
#
# OF COMPRESSORS

16 RSMV Technical Guide
RSMV 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.
#OF EXVs
#
# OF EXPANSION VALVES
COMP A1=
MOD OR FIXED
COMPRESSOR A1 STATUS
#OF COND
1 or 0
# OF CONDENSERS
SYSTEM
STATUS
MODE
SYSTEM MODE
Possible choices are
OFF, COOL, HEAT, DEHUMID, FORCE
COMP A1-D1
OFF/
MODULATING %
COMPRESSOR A1, B1, C1, D1
(based on board address)
OFF / MOD POSITION
OFF: Compressor is o󰀨.
MODULATING PERCENTAGE: 0-100%
COMP A2-D2
ON/OFF
COMPRESSOR A2, B2, C2, D2
(based on board address)
ON, OFF, FORCE
ON: Compressor is on. OFF: Compressor is o󰀨.
COND FAN
NOT USED/OFF/
MODULATING %
CONDENSER FAN
NOT USED, OFF, MOD POSITION
OFF: Condenser is o󰀨.
MODULATING PERCENTAGE: 0-100%
EXV A1-D1
0%
EXV A1, B1, C1, D1
(based on board address)
EXV VALVE POSITION
0 to 100 percent
EXV A2-D2
0%
EXV A2, B2, C2, D2
(based on board address)
EXV VALVE POSITION
0 to 100 percent

17
RSMV Technical Guide
RSMV LCD SCREENS
Sensor Status and Setpoint 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.
Setpoint Status Screens
Refer to the following map when navigating through the Setpoint
Status Screens. From the SETPOINT STATUS Screen, press
<ENTER> to scroll through the screens.
SENSOR
STATUS
SUCTION
XXX PSI
SUCTION PRESSURE READING FROM INPUT
HEAD
XXX PSI
HEAD PRESSURE READING FROM INPUT
SUPRHT 1
XXºF
CURRENT SUPERHEAT 1 CALCULATION
SUPRHT 2
XXºF
CURRENT SUPERHEAT 2 CALCULATION
COIL 1
XXºF
COIL TEMPERATURE 1 READING FROM
TEMPERATURE SENSOR INPUT
COIL 2
XXºF
COIL TEMPERATURE 2 READING FROM
TEMPERATURE SENSOR INPUT
CALC CT
XXºF
CALCULATED COIL TEMPERATURE FROM
SUCTION PRESSURE INPUT
SETPOINT
STATUS
HEADPRSP
340 PSI
HEAD PRESSURE SETPOINT
Valid range is 275 to 475 PSI. Default is 340 PSI.
SPRHT SP
15ºF
SUPERHEAT SETPOINT SETTING
Valid range is 1ºF to 30ºF. Default is 15ºF.

18 RSMV Technical Guide
RSMV LCD SCREENS
Setpoint Status Screens and Alarms Screen
Alarms Screen
If an alarm is present, the ALARM LED above the LCD display will
light up red and blink. TheAlarms 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.
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 5 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%.
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%.
COIL TEMP A1 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 5 minutes if the sensor is detected.
COIL TEMP A2 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 5 minutes if the sensor is detected.
COMPRESSOR (COMP) A1 FAILURE: 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 5 minutes.
COMPRESSOR (COMP) A2 FAILURE: 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 5 minutes.
LOW SUPERHEAT 1 (SH1) DETECTED: This alarm will be activated
when the Superheat is less than 4ºF for 2 minutes during normal operation
or for 4 minutes during the rst 10 minutes. The system will shut down
and will retry after 5 minutes.
LOW SUPERHEAT 2 (SH2) DETECTED: This alarm will be activated
when the Superheat is less than 4ºF for 2 minutes during normal operation
or for 4 minutes during the rst 10 minutes. The system will shut down.
The system will shut down and will retry after 5 minutes.
HIGH SUPERHEAT 1 (SH1) WARNING: If superheat is above 25ºF
for 2 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 is above 25ºF
for 2 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 is above 30ºF
for 10 minutes, it will fail the compressors. It will retry after 5 minutes. If
it fails twice in 2 hours, it will lock out the compressors.
HIGH SUPERHEAT 2 (SH2) FAILURE: If superheat is above 30ºF
for 10 minutes, it will fail the compressors. It will retry after 5 minutes. If
it fails twice in 2 hours, it will lock out the compressors.
HIGH SUPERHEAT LOCKOUT: If the module fails on high superheat
twice in 2 hours, it will lock out the compressors.
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 SUCTION PRESSURE (SP) FAILURE: This alarm will occur
if suction pressure stays below the low suction pressure setpoint for 1
minute or falls below 40 psi for 5 seconds. This alarm will shut down the
system. The system will retry after 5 minutes.
EBUS SLAVE (SLV) TIMEOUT: This alarm indicates communication
has been lost between the RSMV and the main controller. This can be the
result of a bad cable, a missing cable, or the main controller or module
not being congured properly.
COPELAND VFD ALARM: Indicates there is an alarm on the
Copeland VFD.
MODBUS MASTER COMM TIMEOUT: Communications has
been lost between the RSM and the VFD that may be connected. This
can be the result of a bad cable, a missing cable, or the module not being
congured properly.
LOW SUCT
95 psi
LOW SUCTION PRESSURE SETPOINT SETTING
Default is 95 PSI.
COILT SP
40ºF
COIL TEMPERATURE SETPOINT SETTING
Valid range is 35ºF to 70ºF. Default is 40ºF.
ALARMS

19
RSMV Technical Guide
RSMV LCD SCREENS
Alarm History and Protected Screens
Protected Screens Map
Refer to the following map when navigating through the LCD
Protected Screens. From the RSMV Screen, press <ENTER> twice to
get to the Software Screen. Then hold the <UP> button for 5 seconds.
To scroll through the rest of the screens, press the <MENU> button.
Alarm History Screens
The ALARM HISTORY Screen displays past alarms, if any, and how
long ago the last of each type occurred. From the ALARM HISTORY
Screen, press <ENTER> to scroll through the history screens.
The Alarm will appear on the rst line and the second line will display
how long ago each alarm last occurred. As a result, the alarms listed
on the ALARMS screen will be abbreviated as follows in order of
the way they are listed in the prior ALARMS screen section.
LOW SP—Low Suction Pressure
UNSAFE SP—Unsafe Suction Pressure
SP SENSE—No Suction Pressure Sensor Detected
HIGH HP—High Head Pressure
HP SENSE—No Head Pressure Sensor Detected
CL TMP1—Coil Temp 1 Failure
CL TMP2—Coil Temp 2 Failure
COMP1 FL—Compressor 1 Failure
COMP2 FL—Compressor 2 Failure
LOW SH1—Low Superheat 1
LOW SH2—Low Superheat 2
HI SH1—High Superheat 1 Failure
HI SH2—High Superheat 2 Failure
COMM T/O—E-BUS Slave Timeout
NOTE: The screen will display minutes for the first 60
minutes of alarm occurrence, hours for the next 72
hours of alarm occurrence, and days for the next 30
days of alarm occurrence. After 30 days, the alarm
will clear. Alarm history is not stored in memory. So,
if power is lost, the alarms will clear.
ALARM
HISTORY RSMV
1072vXXX
EBUS
+0
RSMV
1072vXXX
Hold for 5 seconds.
DIAGNSTC
ALARM
COUNTS
VFD TEST
ADDRESS
1(152)
ENTER TO
EXIT

20 RSMV Technical Guide
RSMV LCD SCREENS
Diagnostic Screens
Diagnostic Screens
Refer to the following map when navigating through the Diagnostic
Screens. From the DIAGNSTC Screen, press <ENTER> to scroll
through the screens.
DIAGNSTC
WDOG CNT
#
WATCH DOG TIMER
Displays the number of times the board has been reset due to
watchdog timer overow.
PWER CNT
#
POWER LOSS COUNT
Displays the number of times the board has been
reset due to power loss.
EEPROM:
HOLD
DOWN
TO
LOAD
DEFAULTS
SP-A VLT
X.XX
SUCTION PRESSURE SENSOR VOLTAGE
Displays the current voltage of the Suction Pressure Sensor.
HP-A VLT
X.XX
HEAD PRESSURE SENSOR VOLTAGE
Displays the current voltage of the Head Pressure Sensor.
BIN1 - BIN4
ON/OFF
BINARY INPUTS #1 - #4
Displays the current status of each Binary Input.
TMP1 VLT
X.XX
COIL TEMPERATURE SENSOR 1 VOLTAGE
Displays the current voltage of the 1st Coil Temperature Sensor.
TMP2 VLT
X.XX
COIL TEMPERATURE SENSOR 2 VOLTAGE
Displays the current voltage of the 2nd Coil Temperature
Sensor.
TMP5 VLT
X.XX
TEMPERATURE SENSOR 5 VOLTAGE (NOT USED)