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AAON RSMD, Technical Manual

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27

RSMD Technical Guide 

TROUBLESHOOTING

Temperature Sensor Testing

Thermistor Sensor Testing Instructions

Use the resistance column to check the thermistor sensor while 

disconnected from the controllers (not powered).

Use the voltage column to check sensors while connected to 

powered controllers. Read voltage with meter set on DC volts. 

Place the “-” (minus) lead on GND terminal and the “+” (plus) 

lead on the sensor input terminal being investigated.

If the voltage is above 4.88 VDC, then the sensor or wiring is 

“open.” If the voltage is less than 0.05 VDC, then the sensor or 

wiring is shorted.

Sensor Voltage and Resistance

The following sensor voltage and resistance table is provided to 

aid in checking sensors that appear to be operating incorrectly. 

See 

Table 5

, below. Many system operating problems can be 

traced to incorrect sensor wiring. Be sure all sensors are wired 

per the wiring diagrams in this manual. 

If the sensors still do not appear to be operating or reading 

correctly, check voltage and/or resistance to confirm that the 

sensor is operating correctly per the tables. Please follow the 

notes and instructions that appear after the chart when checking 

sensors.

Table 6:  0-5V Temperature Sensor - Voltage & Resistance for Type III Sensors

Temperature – Resistance – Voltage for Type III 10 K Ohm Thermistor Sensors

Temp

(ºF)

Temp

(ºC)

Resistance

(Ohms)

Voltage @ 

Input (VDC)

Temp

(ºF)

Temp

(ºC)

Resistance

(Ohms)

Voltage @ 

Input 

(VDC)

-10

-23.3

93333

4.51

72

22.2

11136

2.635

-5

-20.6

80531

4.45

73

22.8

10878

2.605

0

-17.8

69822

4.37

74

23.3

10625

2.576

5

-15

60552

4.29

75

23.9

10398

2.549

10

-12.2

52500

4.2

76

24.4

10158

2.52

15

-9.4

45902

4.1

77

25

10000

2.5

20

-6.6

40147

4.002

78

25.6

9711

2.464

25

-3.9

35165

3.891

80

26.7

9302

2.41

30

-1.1

30805

3.773

82

27.8

8893

2.354

35

1.7

27140

3.651

84

28.9

8514

2.3

40

4.4

23874

3.522

86

30

8153

2.246

45

7.2

21094

3.39

88

31.1

7805

2.192

50

10

18655

3.252

90

32.2

7472

2.139

52

11.1

17799

3.199

95

35

6716

2.009

54

12.2

16956

3.143

100

37.8

6047

1.884

56

13.3

16164

3.087

105

40.6

5453

1.765

58

14.4

15385

3.029

110

43.3

4923

1.65

60

15.6

14681

2.972

115

46.1

4449

1.54

62

16.7

14014

2.916

120

48.9

4030

1.436

64

17.8

13382

2.861

125

51.7

3656

1.339

66

18.9

12758

2.802

130

54.4

3317

1.246

68

20

12191

2.746

135

57.2

3015

1.159

69

20.6

11906

2.717

140

60

2743

1.077

70

21.1

11652

2.691

145

62.7

2502

1.001

71

21.7

11379

2.661

150

65.6

2288

0.931

Summary of Contents for RSMD

Page 1: ...RSMD Technical Guide ...

Page 2: ...cument This document is subject to change without notice RSMD REVISION LOG REVISION DATE CHANGE Rev F March 15 2021 Incorporated RSMD2R differentiation information www aaon com 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 CommLink 5 ASM01874 EBC E BUS Cable Assembl...

Page 3: ...creens 14 System Status Screens 15 Sensor Status Screens 16 Setpoint Status Screens 17 Alarms Screens 18 Alarm History and Protected Screens 20 Configuration and Diagnostic Screens 21 Diagnostic Screens 22 Alarm Counts and Address Screen 23 TROUBLESHOOTING 24 LED Diagnostics 24 Suction Pressure Transducer Testing 25 Copeland Discharge Thermistor Temperature Sensor Testing 26 Temperature Sensor Tes...

Page 4: ...ion Keys 13 Figure 5 RSMD LED Locations 24 Figure 6 Default Two Condenser RSMD Module Wiring 29 Figure 7 Prism 2 Condenser Configuration Default Two Condenser Operations 30 Figure 8 Single Condenser Per RSMD Module Wiring 31 Figure 9 Prism 2 Condenser Configuration Single Condenser Per Module 32 Figure 10 Single Condenser Per Two RSMD Modules Wiring 33 Figure 11 Prism 2 Condenser Configuration Sin...

Page 5: ...puts See Figures 2 3 pages 8 9 for wiring The RSMD 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 Dehumidification mode it controls the Compressors to the Suction Saturation Temperature Setpoint...

Page 6: ...ING IS 1 AMP CONDENSER 1 COMP 1 COMP 2 ANALOG OUT REVERSING VALVE COMMON RELAY OUTPUT TERMINALS LABEL P N G041660 COND 1 COND 2 GND 24 VAC POWER ONLY WARNING POLARITY MUST BE OBSERVED OR THE CONTROLLER WILL BE DAMAGED CONDENSER 2 HEAD PRES 1 5 V 5 V COMP DIS 1 COMP 1 SP 1 HP 1 COMP DIS 2 COMP 2 GND GND OA COIL POWF EMER SHDN GND LEAVING H20 GND SUCTION PRES 2 HEAD PRES 2 5 V 5 V SP 2 HP 2 GND GND ...

Page 7: ...ll 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 ...

Page 8: ...evels 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 restore...

Page 9: ...e Size transformer for correct total load RSMD2R 18 VA 10A250VAC 5A30VDC SA VDE G5Q 1A4 OMRON DC12V CHINA Belimo actuator wiring shown Consult factory for other manufacturer wiring instructions Note All relay outputs are normally open and rated for 24 VAC power only 1 Amp maximum load 24 VAC ONLY COMPRESSOR 1 ENABLE COMPRESSOR 2 ENABLE CONDENSER 1 ENABLE CONDENSER 2 ENABLE REVERSING VALVE Digital ...

Page 10: ...or Discharge Temperature Sensor 1 TEMP1 6 Compressor Discharge Temperature Sensor 2 TEMP2 7 Leaving Water Temperature Sensor TEMP3 Binary Inputs 1 Compressor Status 1 BIN1 2 Compressor Status 2 BIN2 3 Outside Coil Temperature Proof of Water Flow BIN3 4 Emergency Shutdown BIN4 Analog Outputs 0 10 VDC 1 Condenser 1 Fan Signal AOUT1 2 Condenser 2 Fan Signal 0 10 VDC or WSE Bypass Actuator 2 10 VDC AO...

Page 11: ...atus 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 relay output 2 If Binary Input 2 opens Compressor 2 Enable Relay will de energize and a Compressor Alarm will be generated BIN3 Outside Coil Temperature Proof of Water Flow Status This input can be used for the following two options Air to Air Heat Pu...

Page 12: ...ure to temperature For Copeland Digital Scroll Compressor units the RSMD will modulate the Copeland Digital Scroll Compressor to maintain the Evaporator Coil Suction Saturation Temperature Setpoint and activate the Compressors as necessary On units that have one Digital and one Fixed Capacity Compressor if the Fixed Capacity Compressor is activated the Copeland Digital Scroll Compressor will only ...

Page 13: ...escriptions 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 configurations DOWN Use this key to adjust setpoints and change configurations ENTER Use the ENTER key to navigate through the Main Menu Screen categories ALARM UP DOWN ENTER MENU Figure 4...

Page 14: ...s 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 RSMD 1067vxxx EBUS COMM P...

Page 15: ...re OFF COOL HEAT DEHUMID FORCE COMP A1 B1 OFF MODULATING COMPRESSOR A1 B1 based on board address OFF MOD POSITION OFF Compressor is off MODULATING PERCENTAGE 0 100 COMP A2 B2 ON OFF COMPRESSOR A2 B2 based on board address ON OFF FORCED OFF Compressor is off ON Compressor is on COND 1 FAN OFF MODULATING CONDENSER FAN 1 OFF MOD POSITION OFF Compressor is off MODULATING PERCENTAGE 0 100 COND 2 FAN OF...

Page 16: ...1 READING FROM INPUT HEAD PR1 XXX PSI HEAD PRESSURE 1 READING FROM INPUT SUCTION 2 XXX PSI SUCTION PRESSURE 2 READING FROM INPUT HEAD PR2 XXX PSI HEAD PRESSURE 2 READING FROM INPUT CALC CT1 XX DEG CALCULATED COIL TEMPERATURE 1 FROM SUCTION PRESSURE 1 INPUT CALC CT2 XX DEG CALCULATED COIL TEMPERATURE 2 FROM SUCTION PRESSURE 2 INPUT COMPTMP1 XX DEG COMPRESSOR TEMPERATURE 1 READING FROM HEAD PRESSURE...

Page 17: ...SSURE SETPOINT STATUS Valid range is 275 to 475 PSI Default is 340 PSI IF CONFIGURED FOR FAN CYCLE THE FOLLOWING TWO SCREENS WILL DISPLAY FAN ON XX PSI HEAD PRESSURE HEADING WHEN FAN CYCLE IS ON FAN OFF XX PSI HEAD PRESSURE READING WHEN FAN CYCLE IS OFF IF CONFIGURED WATER SOURCE HEAT PUMP THE FOLLOWING THREE SCREENS WILL DISPLAY GLYCOL GLYCOL PERCENTAGE STATUS LOW SUCT 95 PSI LOW SUCTION PRESSURE...

Page 18: ...ower must be cycled to clear the alarm LOW SUCTION PRESSURE 2 SP2 FAILURE This alarm will occur if Suction Pressure 2 stays below the low suction pressure setpoint for one minute or falls below 40 psi for five seconds This alarm will shut down the system Power must be cycled to clear the alarm LOW SUCTION PRESSURE 1 SP1 DETECTED This alarm will occur if Suction Pressure 1 falls below the low sucti...

Page 19: ... and there is no Proof of Flow Input Enable for more than three minutes or if during Heat Pump heating the Proof of Flow Enable is open for more than two seconds This alarm will disable when Proof of Flow is enabled LOW H2O TEMPERATURE If both compressors are on and water temp goes below setpoint Compressor 2 will fail If both compressors are on and water temp goes 3ºF below setpoint both compress...

Page 20: ...RMS screen section 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 Protected Screens Map Refer to the following map when navigating through the LCD Prote...

Page 21: ...h the screens DIAGNSTC WDOG CNT WATCHDOG TIMER Displays the numbers of times the board has been reset due to watchdog timer overview POWR CNT POWER LOSS COUNT Displays the numbers of times the board has been reset due to power loss EPROM HOLD DOWN TO LOAD DEFAULTS SP 1 VLT X XX SUCTION PRESSURE SENSOR 1 VOLTAGE Displays the current voltage of the Suction Pressure Sensor 1 HP 1 VLT X XX HEAD PRESSU...

Page 22: ...DE Displays the current status of Force Mode Values are ON OFF IF FORCE MODE IS ON THE FOLLOWING SCREENS WILL APPEAR RLY 1 5 ON OFF RELAYS 1 5 FORCE MODE Press the UP or DOWN buttons to select ON or OFF for reach relay TRIAC 1 ON OFF TRIAC 1 Displays the current status of Digital Compressor 1 Values are ON OFF TRIAC 2 ON OFF TRIAC 1 Displays the current status of Digital Compressor 2 Values are ON...

Page 23: ...e only way to clear these alarm counts is by using Prism 2 and selecting Select Alarms to Delete from the ALARM button menu See Alarm Polling in the Prism 2 Technical Guide for more information Address Screen ADDRESS 1 152 CURRENT BOARD ADDRESS 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 addre...

Page 24: ...his LED will light up to indicate that 24 VAC power has been applied to the controller Binary Input LEDs BIN1 This green LED will light up when Compressor Status 1 contact is closed BIN2 This green LED will light up when Compressor Status 2 switch is closed BIN3 This green LED will light up when the Outside Coil Temperature switch is closed BIN4 This green LED will light up when the Emergency Shut...

Page 25: ...iate chart depending on the refrigerant you are using If the temperature voltage or pressure voltage readings do not align closely with the chart your Suction Pressure Transducer is probably defective and will need to be replaced See the Suction Pressure Transducer Pressure Temperature and Voltage Chart for R410 A Refrigerant testing The charts show a temperature range from 20 F to 80 F For troubl...

Page 26: ...us lead on the sensor input terminal being investigated If the voltage is above 4 98 VDC then the sensor or wiring is open If the voltage is less than 0 38 VDC then the sensor or wiring is shorted Discharge Thermistor Temperature Resistance Temp ºF Temp ºC Resistance K Ohms Voltage Input VDC Temp ºF Temp ºC Resistance Ohms Voltage Input VDC 40 40 2889 60 4 98 167 75 12 73 2 80 31 35 2087 22 4 97 1...

Page 27: ...llow the notes and instructions that appear after the chart when checking sensors Table 6 0 5V Temperature Sensor Voltage Resistance for Type III Sensors Temperature Resistance Voltage for Type III 10 K Ohm Thermistor Sensors Temp ºF Temp ºC Resistance Ohms Voltage Input VDC Temp ºF Temp ºC Resistance Ohms Voltage Input VDC 10 23 3 93333 4 51 72 22 2 11136 2 635 5 20 6 80531 4 45 73 22 8 10878 2 6...

Page 28: ...terminal See Table 7 this page Head Pressure Transducer Chart Voltage Pressure Voltage Pressure 0 5 0 2 6 350 0 6 17 2 7 367 0 7 33 2 8 384 0 8 50 2 9 400 0 9 67 3 0 417 1 0 83 3 1 434 1 1 100 3 2 450 1 2 117 3 3 467 1 3 133 3 4 484 1 4 150 3 5 500 1 5 167 3 6 517 1 6 183 3 7 534 1 7 200 3 8 550 1 8 217 3 9 567 1 9 233 4 0 584 2 0 250 4 1 600 2 1 267 4 2 617 2 2 283 4 3 634 2 3 300 4 4 650 2 4 317...

Page 29: ...VE Digital Compressor 1 Digital Compressor 2 Condenser Signal 1 Condenser Signal 2 RLY2 RLY1 RLY4 RLY3 RLY5 COMM UNLOAD 24 VAC UNLOAD AOUT1 GND AOUT2 Connects to VCCX2 Loop Communications connector when used on a split system GND GND COM COM Only used when unit is controlling digital compressors ALARM UP DOWN ENTER MENU AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSE...

Page 30: ...erations RSMD Main Configuration Screen 2 Condenser Options 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 D BOX 26 40 Ton C BOX 16 20 Ton B BOX RSMD CONFIGURATION Condenser Options 2 Cond per RSMD USE or TO CHANGE ...

Page 31: ...stem GND GND COM COM Only used when unit is controlling digital compressors ALARM UP DOWN ENTER MENU AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSER 1 COMP 1 COMP 2 ANALOG OUT REVERSING VALVE COMMON RELAY OUTPUT TERMINALS LABEL P N G041660 COND 1 COND 2 GND 24 VAC POWER ONLY WARNING POLARITY MUST BE OBSERVED OR THE CONTROLLER WILL BE DAMAGED CONDENSER 2 HEAD PRES 1 ...

Page 32: ...een 2 Condenser Options Select the 1 Condenser for 1 RSMD option on the above Hand Held Service Tool Screen HVAC Unit Application The Single Condenser for One RSMD configuration is used with the following HVAC units B BOX Air to Air Heat Pump B BOX WSHP C BOX 25 30 Ton C BOX Air to Air Heat Pump C BOX WSHP RSMD CONFIGURATION Condenser Options 1 Cond for 1 RSMD USE or TO CHANGE ...

Page 33: ... match and 2 and 4 match 10A250VAC 5A30VDC SA VDE G5Q 1A4 OMRON DC12V CHINA ALARM UP DOWN ENTER MENU AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSER 1 COMP 1 COMP 2 ANALOG OUT REVERSING VALVE COMMON RELAY OUTPUT TERMINALS LABEL P N G041660 COND 1 COND 2 GND 24 VAC POWER ONLY WARNING POLARITY MUST BE OBSERVED OR THE CONTROLLER WILL BE DAMAGED CONDENSER 2 HEAD PRES 1 ...

Page 34: ...wo Modules RSMD Main Configuration Screen 2 Condenser Options Select the 1 Condenser for 2 RSMDs option on the above Hand Held Service Tool Screen HVAC Unit Application The Single Condenser for Two RSMDs configuration is used with the following HVAC units RLA BOX RLB BOX RLE BOX RSMD CONFIGURATION Condenser Options 1 Cond for 2 RSMDs USE or TO CHANGE ...

Page 35: ...d Only used on first module Not used on second and third Note If there are four modules 1 and 3 match and 2 and 4 match AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSER 1 COMP 1 COMP 2 ANALOG OUT REVERSING VALVE COMMON RELAY OUTPUT TERMINALS LABEL P N G041660 COND 1 COND 2 GND 24 VAC POWER ONLY WARNING POLARITY MUST BE OBSERVED OR THE CONTROLLER WILL BE DAMAGED CONDE...

Page 36: ...or Three Modules RSMD Main Configuration Screen 2 Condenser Options Select the 1 Condenser for 3 RSMDs option on the above Hand Held Service Tool Screen HVAC Unit Application The One Condenser for Three RSMDs configuration is used with the following HVAC units RLC BOX RLD BOX RSMD CONFIGURATION Condenser Options 1 Cond for 3 RSMDs USE or TO CHANGE ...

Page 37: ... 1 Digital Compressor 2 Condenser Signal A1 B1 Condenser Signal A2 B2 RLY2 RLY1 RLY4 RLY3 RLY5 COMM UNLOAD 24 VAC UNLOAD AOUT1 GND AOUT2 Connects to VCCX2 Loop Communications connector when used on a split system GND GND COM COM Only used when unit is controlling digital compressors ALARM UP DOWN ENTER MENU AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSER 1 COMP 1 CO...

Page 38: ...2 Loop Communications connector when used on a split system GND GND Only used when unit is controlling digital compressors ALARM UP DOWN ENTER MENU AAON P N ASM02201 24 VAC GND RELAY CONTACT MAX 24 VAC RATING IS 1 AMP CONDENSER 1 COMP 1 COMP 2 ANALOG OUT REVERSING VALVE COMMON RELAY OUTPUT TERMINALS LABEL P N G041660 COND 1 COND 2 GND 24 VAC POWER ONLY WARNING POLARITY MUST BE OBSERVED OR THE CONT...

Page 39: ...SMD Main Configuration Screen 2 Condenser Options Select the 2 Condensers for 2 RSMDs option on the above Hand Held Service Tool Screen HVAC Unit Application The Two Condensers per Two RSMDs configuration is used with the following HVAC units D BOX 50 70 Ton D BOX Air to Air Heat Pump D BOX WSHP RSMD CONFIGURATION Condenser Options 2 Cond for 2 RSMDs USE or TO CHANGE ...

Page 40: ...n to have the Condenser Fan turn On Off with the 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 ...

Page 41: ...41 RSMD Technical Guide NOTES ...

Page 42: ...15 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 PARTS For replacement parts please contact your local AAON Representative ...

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