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9.0 DIAGNOSTICS & TROUBLESHOOTING

Diagnostics

9.9 Service Analyzer Charts (cont.)

REFRIGERANT FLOOD BACK

SYMPTOM

POSSIBLE CAUSE

REMEDY

Poor system control

using an EXV

Bad pressure reading

Check transducer wiring.

Suction thermistor in wrong location

Relocate thermistor.

Bad suction thermistor

Replace thermistor.

Improper superheat setting (less than 5

F [2.8

C])

Adjust Exv SH setpoint dipswitches and validate valve operation.

ELECTRONIC EXPANSION VALVES

SYMPTOM

POSSIBLE CAUSE

REMEDY

High Superheat, Low

Suction Pressure

(superheat over

F [8.3

C])

Moisture freezing and blicking valve

Recover charge, replace filter-drier, evacuate system, recharge.

Dirt or foreign material blocking valve

Recover charge, replace filter-drier, evacuate system, recharge.

Low refrigerant charge

Correct the charge.

Vapor bubbles in liquid line

Remove restriction in liquid line. Correct the refrigerant charge.

Remove noncondensible gases.

Size liquid line correctly.

Undersized EXV

Replace with correct valve.

Incorrect sensing suction line temperature

Verify suction thermistor resistance is correct and properly

attached and insulated to the vapor line.

Suction thermistor incorrectly calibrated

Replace suction thermistor assembly.

Suction pressure measured incorrectly

After verifying lack of connectivity, replace the pressure transducer

or harness.

If harness has a short, replace harness.
If gauge pressure measurement and the converted voltage reading

at the control are different replace pressure transducer.
If gauge pressure measurement and the converted voltage read

ings at the control are the same, replace the control.

EXV is stuck

Remove EXV from the system and purge with nitrogen, replace

filter drier, and recharge.
If EXV will not open, validate EXV wiring harness and rotor resis

tance between the black wire and the other 4 wires.
If none of the above rectifies the issue, replace EXV and filter drier

and recharge.

VSODC dc circuit failed

Verify 5Vdc to pressure transducer is present. If not, replace

VSODC.

High superheat adjustment

Change the superheat offset dip switches to increase superheat.

Содержание A2024AJVCA

Страница 1: ...NSTALLATION ADJUSTMENT AND OPERATION OF THIS UNIT READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR OPERATION FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATIO...

Страница 2: ...tat 25 5 7 IndoorAir FlowVerification 26 5 8 Refrigerant Charging 26 5 8 1 Measurement Device Set Up 27 5 8 2 Preliminary Charging by Weight 27 5 8 3 Preliminary Charging by Pressures 27 5 8 4 Final C...

Страница 3: ...disclaims any responsibility for such loss or injury resulting from the use of such unauthorized components accessories or devices CAUTIONS R 410A systems operate at approximately 60 higher pressures...

Страница 4: ...1 of this manual 2 3 Importance of Quality Installation A quality installation is critical to assure safety reliability comfort and customer satisfaction Strict adherence to applicable codes the info...

Страница 5: ...S CONTROLS C COMMUNICATING TYPE V INVERTER VOLTAGE J 1 PH 208 230 60 MAJOR SERIES A 1st GENERATION CAPACITY 24 24000 BTU HR 7 03 kW 36 36000 BTU HR 10 55 kW 48 48000 BTU HR 14 07 kW 60 60000 BTU HR 17...

Страница 6: ...NDED Rev 11 15 Electrical Fuse or HACR Circuit Breaker Compressor Rated Load Amperes RLA Locked Rotor Amperes LRA Model Number A20 Phase Frequency Hz Voltage Volts Fan Motor Full Load Amperes FLA Mini...

Страница 7: ...y cylinders need to have a 400 psig 2 758 kPa service pressure rating DOT 4BA400 or DOT BW400 Combustibility At pressures above 1 atmosphere a mixture of R 410A and air can become combustible R 410A a...

Страница 8: ...f other equipment installed in proximity to the unit Maintain all required minimum distances to gas and electric meters dryer vents and exhaust and inlet openings In the absence of national codes or m...

Страница 9: ...r that will not wash off with water 4 2 4 Customer Satisfaction Issues The outdoor unit should be located away from the living sleeping and recreational spaces of the owner and those spaces on adjoini...

Страница 10: ...mpressor Capacity losses System oil level adjustment 4 4 2 1 Oil Return to Compressor Small amounts of compressor crankcase oil is picked up and carried out of the compressor by the moving refrigerant...

Страница 11: ...342E ZE9 130 ZPV038CE 2E9 130 Compressor Nameplate Oil Charge oz 40 40 40 40 4 4 2 6 Capacity Losses Long line lengths can result in a reduction in capacity due to suction line pressure drop and heat...

Страница 12: ...line 4 90 LR elbows and a filter drier Fitting Equivalent Length ft 4 9 6 9 6 Total Equivalent Length ft 75 9 6 84 6 This application is acceptable because the 25 vertical rise is less than the maximu...

Страница 13: ...0 99 50 0 98 50 0 97 50 0 96 4 Ton 3 8 3 4 25 0 99 50 0 98 50 0 97 50 0 96 50 0 94 50 0 93 1 2 3 4 25 0 99 50 0 98 50 0 97 50 0 96 50 0 94 50 0 93 3 8 7 8 25 1 00 50 0 99 50 0 99 50 0 98 50 0 98 50 0...

Страница 14: ...15 0 99 15 0 99 15 0 98 15 0 97 15 0 96 14 1 KW 4 Ton 9 53 3 8 19 05 3 4 8 0 99 15 0 98 15 0 97 15 0 96 15 0 94 15 0 93 12 7 1 2 19 05 3 4 8 0 99 15 0 98 15 0 97 15 0 96 15 0 94 15 0 93 9 53 3 8 22 23...

Страница 15: ...to form vapor insulating the liquid line is required Use clean dehydrated sealed refrigeration grade tubing Always keep tubing sealed until tubing is in place and connections are to be made A high qua...

Страница 16: ...ICATIONS INSULATED SUCTION LINE FULL LENGTH REFERENCE TABLE 2 FOR MAXIMUM LENGTH LIMITATIONS Figure 3 For applications with the outdoor unit and indoor unit on the same level the following is required...

Страница 17: ...nit below the indoor coil the following is required Inverted suction line trap Reference Figure 4 Insulated liquid line in unconditioned space only Follow the proper line sizing maximum linear and equ...

Страница 18: ...conditioned space only Follow the proper line sizing maximum linear and equivalent length maximum vertical separation charging requirements and oil level adjustments spelled out in this document Tubin...

Страница 19: ...f the tubing with a clean dry cloth before soldering Clean out debris chips dirt etc that enters tubing or service valve connections Wrap valves with a wet rag or thermal barrier compound before apply...

Страница 20: ...cuation see Sections 4 7 and 4 8 for evacuation and final leak testing ST A1226 06 00 The suction line must be insulated for its entire length to prevent dripping sweating and prevent performance loss...

Страница 21: ...l 24VAC 2 stage ther mostat many features and benefits are lost Therefore a conventional 24VAC 2 stage thermostat should only be used in temporary emergency situations until communication issues with...

Страница 22: ...s the settings status or service icons at the bottom of the touch screen Refer to the air handler or furnace installation manual and the EcoNet Control Center installation manual for further details o...

Страница 23: ...ble operating voltage range is shown below VOLTAGE RANGES Nameplate Voltage Operating Voltage Range at Maximum Load Conditions 208 230 1 Phase 197 253 Install a branch circuit disconnect within sight...

Страница 24: ...wer to the indoor and outdoor units The EcoNetTM Control Center should be switched to the off position initially Within 45 seconds of power being applied the EcoNetTM Control Center should detect the...

Страница 25: ...the screen and then touch Stop Test Then touch the left arrow on the screen to return to the main screen 9 If the indoor blower continues to run continuously after exiting the Charge Mode cycle the p...

Страница 26: ...the installation and should be done prior to final charge adjustment NOTICE AHRI rated CFM may differ slightly from values in the table below Outdoor Unit Model No Displayed Indoor CFM Cooling Mode A...

Страница 27: ...3 g or volumetric charging device adjust the refrigerant charge based on the actual line set length If the entire system has been evacuated add the total calculated charge IMPORTANT Charging by weigh...

Страница 28: ...___ C as measured from a temperature probe located within 6 15 2 cm outside of the unit on the copper liquid line small line It is recommended to use a calibrated clamp on temperature probe or an insu...

Страница 29: ...then direct the variable speed ECM indoor blower motor to start and operate at the requested cooling air flow level As the building load changes throughout the call for cooling operation the compresso...

Страница 30: ...2nd stage operation the compressor will ramp to its full capacity speed and the RHMV air handler will deliver the maximum air flow level For gas furnace applications the variable speed gas furnace wi...

Страница 31: ...densing units are equipped with a discharge line thermistor that is used to measure the compressor discharge temperature This sensor s leads connect directly to the inverter which communicates with th...

Страница 32: ...cation of each 1 Thermostat Terminals 2 Communication wire terminals 3 Modbus unitary inverter communication connection 4 Outdoor PSC Fan relay connections 5 Outdoor ambient thermistor connection 6 Co...

Страница 33: ...menu CS Compressor Speed For this selection menu to initiate the requested compressor speed there must be an active call for compressor operation the com pressor must be operating and the selection m...

Страница 34: ...ng Filter 7 9 High Pressure Control HPC Sensing of the compressor discharge pressure is accomplished by a conventional automatic reset pressure control that is brazed into the compressor discharge lin...

Страница 35: ...equency 3 phase power that is connected to the 3 phase compressor motor Each of the four A20 models has a unique inverter specifically designed and qualified for that specific model to provide reliabl...

Страница 36: ...h a suction line thermistor for the purposes of measuring suction gas temperature The measured temperature is paired with the saturated suction temperature and used by the VSODC to calculate superheat...

Страница 37: ...vel until the compressor speed returns to normal speed based on the capacity demand 8 4 Off Cycle Refrigerant Migration Stator Heat Refrigerant can migrate to a cold compressor during the off cycle wh...

Страница 38: ...TE If the system experiences a low refrigerant pressure lock out the system should be evaluated to determine the cause for the low pressure condition and corrective action taken to eliminate the cause...

Страница 39: ...the EcoNetTM Control Center and Variable Speed Outdoor Control identifying which sensor has failed See the table below for the default operation for a sensor failure FAILED COMPONENT FUNCTION DEFAULT...

Страница 40: ...ol Center service menu select SERVICE on the screen and navigate to the fault code section to retrieve any fault codes that have been stored To access fault codes on the VSODC press the SW2 and TEST b...

Страница 41: ...run time 30 seconds active The unit has received a command for first stage cooling during an active anti short cycle timer or minimum run timer Wait until unit timer has expired or press the TEST butt...

Страница 42: ...rter Fault Compressor Overcurrent Compressor is pulling more current than allowed Compressor Shorted to Ground Check resis tance of windings to ground Wiring to compressor or molded plug damage Inspec...

Страница 43: ...w 10 Flashes A907_O Inverter Fault DC Bus Undervoltage Incoming Voltage 170 VAC Verify Incoming voltage to Drive by measuring voltage at L1 to L2 Yellow 9 Flashes T908_O Inverter Fault PIM Over Temp I...

Страница 44: ...nections at U V W and Molded plug Check Compressor Windings for significant differences in resistance Yellow 14 Flashes A912_O Inverter Fault Micro Fault Micro on Drive Faulted Hard Reset on Drive If...

Страница 45: ...s Cable Hard Reset of Drive If fault persists replace drive Yellow 8 Flashes A921_O Inverter Fault PFC Temp Sensor Open Sensor to PFC is either low or open Verify proper airflow over the heatsink of t...

Страница 46: ...reset Check fault history for cause of lockout condi tion at control center Address fault as indicated in history A929_O 240VAC Missing or Comm Failure Formerly Comm Failure Drive is either not power...

Страница 47: ...VSODC Verify leads to sensor are not pinched or damaged Check sensor resistance temp A954_O Suction Tempera ture Thermistor Failure Suction Thermistor is either Open Shorted or Low Until will run in...

Страница 48: ...ssure switch has opened Check Refrigerant Charge Check connection of HPS to Drive A958_O High Refrigerant Pressure System High pressure switch has opened 3 times and is locked out for one hour Check R...

Страница 49: ...e When Discharge temperature exceeds 235 o F Compressor will slow down to bring discharge temperature down below 200oF Check system superheat and charge Verify reversing valve is not leaking from disc...

Страница 50: ...condition in the power factor correction circuit the inverter will auto matically shut the compressor off and keep it from operation There is a 5 minute delay after this fault occurs before VSODC will...

Страница 51: ...nverter will automatically shut the compres sor off and keep it from operation There is a 5 min ute delay after this fault occurs before VSODC will restart the compressor If this fault occurs 3 times...

Страница 52: ...ORTANT This mode of active protection must be manually reset L15 PIM Temperature Fold back T922_O Inverter Fault If the inverter detects a high Power Module tem perature the inverter will automaticall...

Страница 53: ...operation The VSODC will lock out the compressor to keep it from continuing to operate and flash an L on the dual 7 segment LEDs followed by a 16 IMPORTANT This mode of active protection must be auto...

Страница 54: ...automatically shut the compressor off and keep it from operation The VSODC will leave the compressor off until the input AC voltage increases to 187VAC At this time the VSODC will restart the compress...

Страница 55: ...set once the OAT sensor failure is corrected 42 Compressor Temperature Thermistor Failure T955_O If the VSODC identifies an issue with the Compressor Sump Thermistor CPT the VSODC will flash a 42 on t...

Страница 56: ...ng C or H and Code Refer to the VSODC Diagnostics Codes section from this manual for fault code troubleshooting Check fault history for other faults See the VSODC Diagnostic Codes and the Active Compr...

Страница 57: ...ers Dirty Indoor Coil Inadequate Indoor Airflow Inoperative Indoor Blower Low on Charge Low Ambient Temperature Bad Compressor Dirty Outdoor Coil Inoperative Outdoor Fan Overcharge Recirculation of Ou...

Страница 58: ...he order of operations is called PEMDAS Parentheses Exponents Multiplication Division Addition and Subtraction Our formula doesn t have any Exponents so we can eliminate that Also there is no Addition...

Страница 59: ...the resistance decreases Measurements will be made with the sensor disconnected from the control board Again comparing the results must be done against a calibrated tester A glass of water mixed compl...

Страница 60: ...sized unit Refrigerant undercharge or overcharge LPC or HPC cycling At inverter input terminals voltage must be between 187 252VAC when unit is operating Adjust refrigerant charge per charging chart...

Страница 61: ...rsized wire feeding unit Correct and complete diagnosis High line voltage Power company problem Report problem High head pressure Overcharge Check system charge Dirty head pump coil Clean coil Faulty...

Страница 62: ...tat Check for control voltage to contactor coil Compressor control circuit High pressure switch Low pressure cut out Ambient thermostat Stater heat is active Compressor timed off on control or interlo...

Страница 63: ...k system charge Refrigerant leaks Repair and recharge Cold noisy compressor Slugging Dilution of oil with refrigerant Observe piping guidelines Noisy compressor Migration Check stater heat and compres...

Страница 64: ...Undersized EXV Replace with correct valve Incorrect sensing suction line temperature Verify suction thermistor resistance is correct and properly attached and insulated to the vapor line Suction ther...

Страница 65: ...nsulation Low superheat adjustment Charge the superheat offset dip switches on indoor coil EXV control to increase superheat Incorrectly sensing suction line temperature Verify suction thermistor resi...

Страница 66: ...Chart Overcharge High High Low High Undercharge Low Low High Low Liquid Restriction Drier Low Low High High Low Indoor Airflow Low Low Low Low Dirty Outdoor Coil High High Low Low Low Outdoor Ambient...

Страница 67: ...task WARNING Disconnect electrical power to the unit before removing the top panel or any electrical panel as the fan motor could start at any time and live electrical connections will be exposed Annu...

Страница 68: ...NSTALLED FACTORY OPTION FACTORY STANDARD LINE VOLTAGE ELECTRICAL WIRING DIAGRAM 90 101229 39 02 VARIABLE SPEED ECONET AC ONLY W ECM MOTOR A 1080S133 ORIGINAL RELEASE NO MODELED BY CHECKED APPROVED REV...

Страница 69: ...air handler settings or furnace settings screen select N C next to the Aux Input 1 Config label e Change the Aux 1 Config type to N C by pressing the orange up or blue down arrows at the bottom of th...

Страница 70: ...e the thermostat will not permit return to the home screen a To turn the unit off either press the blue down button until stop test appears at the bottom of the screen and then press stop test on the...

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