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Summary of Contents for AAON RSMD
- Page 1 RSMD Technical Guide...
- Page 2 RSMD REVISION LOG REVISION & DATE CHANGE Rev. F, March 15, 2021 Incorporated RSMD2R differentiation information RSMD PARTS REFERENCE PART DESCRIPTION PART NUMBER Refrigerant System Module for Digital Compressors ( RSMD) ASM02201 VCCX2 Controller ASM01698 Prism 2 ASM02533 IP Module Kit ASM01902...
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Page 3: Table Of Contents
Cooling Mode, Dehumidification, and Head Pressure Control ................12 LCD SCREENS ....................... 13 LCD Display Screen and Navigation Keys ......................13 Main Screens Map and RSMD Module Screens ....................14 System Status Screens ............................15 Sensor Status Screens ............................16 Setpoint Status Screens ............................ - Page 4 Single Condenser Per RSMD Module Wiring Figure 8: .....................31 Prism 2 Condenser Configuration: Single Condenser Per Module Figure 9: ..............32 Single Condenser Per Two RSMD Modules Wiring Figure 10: ...................33 Prism 2 Condenser Configuration: Single Condenser Per Two Modules Figure 11: ............34...
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Page 5: Overview
3. Reheat is present on the first circuit. The RSMD is connected to the VCCX2 Controller. Up to four RSMD’s 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. -
Page 6: Rsmd Dimensions
EMER SHDN OBSERVED OR THE CONTROLLER COMP DIS 1 WILL BE COMP DIS 2 DAMAGED LEAVING H20 E-BUS DUAL E-BUS LABEL P/N: G041660 R+ SHD T- EXPANSION 4.10 0.75 0.74 0.52 1.50 1.50 1.33 Figure 1: RSMD Dimensions RSMD Technical Guide... -
Page 7: Installation And Wiring
The main unit controller and modules are 2. All 24 VAC wiring must be connected so that all factory installed and wired at the AAON factory. Some of the ground wires remain common. Failure to follow this following information may not apply to your installation if it procedure can result in damage to the controller and was pre-wired at the factory. -
Page 8: Wiring
The saturated refrigerant temperature is used to properly control the compressors to maintain a given Suction The RSMD is connected to the VCCX2 Controller. Up to four Coil (Saturated) Temperature Setpoint. In Cooling mode, RSMD’s can be connected, depending on the size of the system. -
Page 9: Rsmd Outputs Wiring
18-30 a split system. 3 Y1 Belimo actuator wiring Size transformer for Line Voltage shown. Consult factory for correct total load. RSMD2R = 18 VA other manufacturer wiring instructions. Figure 3: RSMD Outputs Wiring RSMD Technical Guide... -
Page 10: Inputs And Outputs
INPUTS AND OUTPUTS RSMD Module Inputs/Outputs Map Inputs/Outputs Map See Table 2, this page for the RSMD inputs and outputs. REFRIGERATION SYSTEM MODULE FOR DIGITAL COMPRESSORS Analog Inputs Suction Pressure 1 Sensor (SP-1) Head Pressure 1 Sensor (HP-1) Suction Pressure 2 Sensor (SP-2) -
Page 11: Rsmd Inputs And Outputs
INPUTS AND OUTPUTS RSMD Inputs and Outputs RSMD - Inputs & Outputs BIN3 - Outside Coil Temperature / Proof of Water Flow Status +5V VDC Power This input can be used for the following two options: This output is a 5 VDC output that supplies power to the Suction Air to Air Heat Pump Pressure Transducers. -
Page 12: Sequence Of Operations
Coil Temperature Setpoint. In units with one digital and one fixed compressors, if the digital If the RSMD has two Digital Compressors, the 1st Compressor compressor modulates to 100% and the SAT is still above the will be locked at 100% and the 2nd Compressor will modulate. -
Page 13: Lcd Screens
Use this key to adjust setpoints and change configurations. ENTER Use the ENTER key to navigate through the Main Menu Screen categories. MENU ENTER DOWN Table 3: Navigation Key Functions Figure 4: LCD Display and Navigation Keys RSMD Technical Guide... -
Page 14: Main Screens Map And Rsmd Module Screens
RSMD Main Screens Map RSMD Module Screens Refer to the following map when navigating through the LCD Refer to the following map when navigating through the RSMD Main Screens. To scroll through the screens, press the Screens. From the RSMD Screen, press to scroll <MENU>... -
Page 15: System Status Screens
WATERSIDE ECONOMIZER BYPASS VALVE COMP A1-B1 CLOSED or MOD POSITION OFF/ CLOSED: Valve is closed. MODULATING PERCENTAGE: 0-100% MODULATING % COMPRESSOR A1, B1 (based on board address) OFF / MOD POSITION OFF: Compressor is off. MODULATING PERCENTAGE: 0-100% RSMD Technical Guide... -
Page 16: Sensor Status Screens
PRESSURE 2 INPUT HEAD PRESSURE 1 READING FROM INPUT If configured for Water Source Heat Pump SUCTION 2 H2O TEMP XXX PSI XX DEG SUCTION PRESSURE 2 READING FROM INPUT WATER TEMPERATURE READING FROM LEAVING WATER TEMPERATURE SENSOR RSMD Technical Guide... -
Page 17: Setpoint Status Screens
FOLLOWING TWO SCREENS WILL DISPLAY DEFR INT 30 MIN FAN ON XX PSI DEFROST INTERVAL SETPOINT STATUS Default is 30 minutes. HEAD PRESSURE HEADING WHEN FAN CYCLE IS ON FAN OFF XX PSI HEAD PRESSURE READING WHEN FAN CYCLE IS OFF RSMD Technical Guide... -
Page 18: Alarms Screens
This alarm indicates that EBUS SLAVE (SLV) TIMEOUT: by lowering compressor modulation percentage. communication has been lost between the RSMD and the Main controller or other E-BUS modules that may be connected. This This alarm will occur if the COMPRESSOR (COMP1) 1 FAULT:... - Page 19 COMPRESSOR (COMP) 1 or 2 LOCKOUT: occurs five times within a four-hour period, the compressor will be locked out. Must cycle power to RSMD to clear the alarm. • If a circuit’s Suction Pressure falls below the Low Suction Pressure Setpoint for longer than one minute twice within a two hour window, the compressor on that circuit will be locked out.
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Page 20: Alarm History And Protected Screens
So, if power is lost, the alarms will clear. DIAGNSTC Protected Screens Map Refer to the following map when navigating through the LCD Protected Screens. From the RSMD Screen, press <ENTER> twice to get to the Software Screen. Then hold the button <UP>... -
Page 21: Configuration And Diagnostic Screens
Displays the numbers of times the board has been reset due to Displays the current voltage of the Suction Pressure Sensor 2. watchdog timer overview. HP-2 VLT X.XX HEAD PRESSURE SENSOR 2 VOLTAGE Displays the current voltage of the Head Pressure Sensor 2. RSMD Technical Guide... -
Page 22: Diagnostic Screens
FORCE MODE AOUT-2 V Displays the current status of Force Mode. Values are ON/OFF. 1.0-10.0 CONDENSER SIGNAL 2 FORCE 0.0 to 10.0 = Active Force Mode Press the <UP> or <DOWN> buttons to increase and decrease the value. RSMD Technical Guide... -
Page 23: Alarm Counts And Address Screen
Configure the address according to which refrigerant circuit this module represents—1=A, 2=B, 3=C, 4=D Number in parentheses is E-BUS address. Module 1’s address is 152, Module 2’s address is 153, Module 3’s address is 154, Module 4’s address is 155 RSMD Technical Guide... -
Page 24: Troubleshooting
- This LED will light up to indicate that 24 VAC power POWER has been applied to the controller. The RSMD is equipped with LEDs that can be used to verify Binary Input LEDs operation and perform troubleshooting. There are LEDs for communication, operation modes, and diagnostic codes. -
Page 25: Suction Pressure Transducer Testing
Suction Line of the Compressor. Use the voltage column to check the Suction Pressure Transducer while connected to the RSMD Module(s). The VCCX2 and the RSMD Module(s) must be powered for this test. Read voltage with a meter set on DC volts. Place the positive lead from the 21.19... -
Page 26: Copeland ® Discharge Thermistor Temperature Sensor Testing
1.80 0.76 56.16 4.24 1.59 0.68 45.81 4.10 1.39 0.61 37.58 3.94 1.25 0.55 30.99 3.77 1.12 0.50 25.68 3.59 1.01 0.45 21.40 3.40 0.92 0.42 17.91 3.20 0.83 0.38 15.07 3.00 Table 5: Discharge Thermistor Temperature/Resistance RSMD Technical Guide... -
Page 27: Temperature Sensor Testing
3317 1.246 12191 2.746 57.2 3015 1.159 20.6 11906 2.717 2743 1.077 21.1 11652 2.691 62.7 2502 1.001 21.7 11379 2.661 65.6 2288 0.931 Table 6: 0-5V Temperature Sensor - Voltage & Resistance for Type III Sensors RSMD Technical Guide... -
Page 28: Head Pressure Transducer
If you suspect there is a problem related to the head pressure transducer, measurements can be taken at the HP terminal. See Table 7, this page. Head Pressure Transducer Chart Voltage Pressure Voltage Pressure Table 7: Head Pressure Transducer Chart RSMD Technical Guide... -
Page 29: Appendix A: Condenser Options
R+ SHD T- EXPANSION Connects to VCCX2 Loop Communications connector when used on 18-30 a split system. Size transformer for Line Voltage correct total load. RSMD2R = 18 VA Figure 6: Default: Two Condenser RSMD Module Wiring RSMD Technical Guide... -
Page 30: Figure 7: Prism 2 Condenser Configuration: Default Two Condenser Operations
Condenser Options 2 Cond per RSMD USE < or > TO CHANGE Select the “2 Condensers per RSMD” option on the above Hand Held Service Tool Screen. HVAC Unit Application The Two Condenser per RSMD configuration is used with the following HVAC units: •... -
Page 31: Single Condenser Per Module
R+ SHD T- EXPANSION Connects to VCCX2 Loop Communications connector when used on 18-30 a split system. Size transformer for Line Voltage correct total load. RSMD2R = 18 VA Figure 8: Single Condenser Per RSMD Module Wiring RSMD Technical Guide... -
Page 32: Figure 9: Prism 2 Condenser Configuration: Single Condenser Per Module
Single Condenser Per Module Figure 9: Prism 2 Condenser Configuration: Single Condenser Per Module RSMD Main Configuration Screen #2 - Condenser Options Select the “1 Condenser for 1 RSMD” option on the above Hand Held Service Tool Screen. RSMD CONFIGURATION Condenser Options 1 Cond for 1 RSMD USE <... -
Page 33: Single Condenser Per Two Modules
Note: If there are four modules, Size transformer for 1 and 3 match and 2 and 4 Line Voltage correct total load. match. RSMD2R = 18 VA Figure 10: Single Condenser Per Two RSMD Modules Wiring RSMD Technical Guide... -
Page 34: Figure 11: Prism 2 Condenser Configuration: Single Condenser Per Two Modules
APPENDIX A: CONDENSER OPTIONS Single Condenser Per Two Modules Figure 11: Prism 2 Condenser Configuration: Single Condenser Per Two Modules RSMD Main Configuration Screen #2 - Condenser Options RSMD CONFIGURATION Condenser Options 1 Cond for 2 RSMDs USE < or > TO CHANGE Select the “1 Condenser for 2 RSMDs”... -
Page 35: Single Condenser For Three Modules
Note: If there are four modules, Size transformer for 1 and 3 match and 2 and 4 Line Voltage correct total load. match. RSMD2R = 18 VA Figure 12: Single Condenser for Three RSMD Modules Wiring RSMD Technical Guide... -
Page 36: Figure 13: Prism 2 Condenser Configuration: Single Condenser For Three Modules
APPENDIX A: CONDENSER OPTIONS Single Condenser Per Three Modules Figure 13: Prism 2 Condenser Configuration: Single Condenser for Three Modules RSMD Main Configuration Screen #2 - Condenser Options RSMD CONFIGURATION Condenser Options 1 Cond for 3 RSMDs USE < or > TO CHANGE Select the “1 Condenser for 3 RSMDs”... -
Page 37: Two Condensers Per Two Modules
DUAL E-BUS LABEL P/N: G041660 R+ SHD T- EXPANSION Connects to VCCX2 Loop Communications connector when used on 18-30 a split system. Size transformer for Line Voltage correct total load. RSMD2R = 18 VA Figure 14: A1/B1 Wiring RSMD Technical Guide... -
Page 38: Figure 15: A2/B2 Wiring
DUAL E-BUS LABEL P/N: G041660 R+ SHD T- EXPANSION Connects to VCCX2 Loop Communications connector when used on 18-30 a split system. Size transformer for Line Voltage correct total load. RSMD2R = 18 VA Figure 15: A2/B2 Wiring RSMD Technical Guide... -
Page 39: Figure 16: Prism 2 Condenser Configuration: A1/B1 And A2/B2 Condenser Configuration
APPENDIX A: CONDENSER OPTIONS Two Condensers Per Two Modules Figure 16: Prism 2 Condenser Configuration: A1/B1 and A2/B2 Condenser Configuration RSMD Main Configuration Screen #2 - Condenser Options RSMD CONFIGURATION Condenser Options 2 Cond for 2 RSMDs USE < or > TO CHANGE Select the “2 Condensers for 2 RSMDs”... -
Page 40: On/Off Condenser Options
Compressors. This can also be selected when No Head Pressure Control is required. Select this option if the Condenser Fan cycles On/Off based on the Fan Cycle Head Pressure Setpoints. Figure 17: Prism 2 Condenser Configuration: ON/OFF Condenser Options RSMD Technical Guide... - Page 41 NOTES RSMD Technical Guide...
- Page 42 RSMD Technical Guide G039810 · Rev. F · 210315 AAON Factory Technical Support: 918-382-6450 techsupport@aaon.com AAON Controls Support: 866-918-1100 Monday through Friday, 7:00 AM to 5:00 PM Central Standard Time Controls Support website: www.aaon.com/controlstechsupport NOTE: Before calling Technical Support, please have the model and serial number of the unit available.
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Questions and answers
Fault code C2FLSACT 0 Min What does this mean?
The fault code "C2FLSACT 0 Min" for AAON RSMD indicates a failure related to Compressor 2 (C2), specifically a low suction pressure condition. The "FLSACT" refers to a low suction pressure fault, and "0 Min" likely refers to the duration or time since the fault occurred or was detected. This fault occurs if Suction Pressure 2 stays below the low suction pressure setpoint for one minute or falls below 40 psi for five seconds.
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