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WARNING:
RECOGNIZE THIS SYMBOL
AS AN INDICATION OF
IMPORTANT SAFETY
INFORMATION
WARNING
THESE INSTRUCTIONS
ARE INTENDED AS AN AID
TO QUALIFIED, LICENSED
SERVICE PERSONNEL FOR
PROPER INSTALLATION,
ADJUSTMENT, AND
OPERATION OF THIS UNIT.
READ THESE INSTRUCTIONS
THOROUGHLY BEFORE
ATTEMPTING INSTALLATION
OR OPERATION. FAILURE
TO FOLLOW THESE
INSTRUCTIONS MAY RESULT
IN IMPROPER INSTALLATION,
ADJUSTMENT, SERVICE,
OR MAINTENANCE
POSSIBLY RESULTING IN
FIRE, ELECTRICAL SHOCK,
PROPERTY DAMAGE,
PERSONAL INJURY, OR
DEATH.
Do not destroy this manual.
Please read carefully and
keep in a safe place for future
reference by a serviceman.
[ ] indicates metric conversions.
92-105074-05-02 (10/15) Printed in USA
THREE STAGE R-410A HEAT
PUMP OUTDOOR UNITS
INSTALLATION INSTRUCTIONS
(-)P17 (17 SEER) EQUIPPED WITH
ECONET™ COMMUNICATIONS
Enabled
ST-A1226-01-00
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Troubleshooting
Related Manuals for EcoNet R-410A
Summary of Contents for EcoNet R-410A
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Page 1: Installation Instructions
THREE STAGE R-410A HEAT WARNING: PUMP OUTDOOR UNITS RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY INFORMATION WARNING THESE INSTRUCTIONS Enabled ARE INTENDED AS AN AID TO QUALIFIED, LICENSED SERVICE PERSONNEL FOR INSTALLATION INSTRUCTIONS PROPER INSTALLATION, ADJUSTMENT, AND OPERATION OF THIS UNIT. -
Page 2: Table Of Contents
Important Checking Refrigerant Charge ���������������������� 29-32 Safety Information ��������������������������������������������� 3 Charging Units General Information ���������������������������������������� 4-7 With R-410A Refrigerant ��������������������������������������������29 Checking Product Received ����������������������������������������4 Confirm ID Airflow and Coils Are Clean ���������������������29 Application �������������������������������������������������������������������4 Measurement Device Setup ���������������������������������������29 Electrical and Physical Data ������������������������������������� 5-6 Charging by Weight ����������������������������������������������������29... -
Page 3: Safety Information
• Turn off electric power at the fuse box or service condition� panel before making any electrical connections. • Only use indoor coils approved for use on R-410A • Complete the ground connection before making systems� An R-22 coil will have a TXV or fixed line voltage connections. -
Page 4: General Information
GENERAL INFORMATION WARNING: Application Before specifying any heat pump equipment, Improper installation, or installation not made in a survey of the structure and a heat loss and accordance with these instructions, can result heat gain calculation must be made� A heat loss in unsatisfactory operation and/or dangerous calculation involves identifying all surfaces and conditions and can cause the related warranty... -
Page 5: Electrical And Physical Data
GENERAL INFORMATION Electrical and Physical Data Rev� 07/15 ELECTRICAL Compressor Fuse or HACR Circuit Breaker Locked Minimum Model Phase Rated Load Rotor Fan Motor Circuit Number Frequency (Hz) Amperes Amperes Full Load Ampacity Minimum Maximum (-)P17 Voltage (Volts) (RLA) (LRA) Amperes (FLA) Amperes Amperes... -
Page 6: Heat Pump
GENERAL INFORMATION R P 17 36 A J V C A MINOR SERIES CONTROLS C - COMMUNICATING N - NON-COMMUNICATING TYPE V - INVERTER VOLTAGE J = 1 PH, 208-230/60 C = 3 PH, 208-230/60 D = 3 PH, 460/60 MAJOR SERIES CAPACITY 24 = 24000 BTU/HR [7.03 kW]... -
Page 7: Specifications
GENERAL INFORMATION Specifications DIMENSIONAL DATA (-)17 Height “H” inches (mm) 35 (889) 35 (889) 39 (991) 45 (1143) Length “L” inches (mm) 33.75 (857) 33.75 (857) 35.75 (908) 35.75 (908) Width “W” inches (mm) 33.75 (857) 33.75 (857) 35.75 (908) 35.75 (908) Proper Installation Proper sizing and installation of this equipment is... -
Page 8: Installation
INSTALLATION Choosing a Location IMPORTANT: Corrosive Environment Consult local and national building codes and ordinances for special The metal parts of this unit may be subject to installation requirements� Following location rust or deterioration if exposed to a corrosive information will provide longer life and simplified environment�... -
Page 9: For Units With
INSTALLATION Choosing a Location (cont�) For Units With Space • If elevating a unit on a flat roof, use 4" x 4" [10�2 cm x 10�2 cm] or equivalent stringers Limitations positioned to distribute unit weight evenly and In the event that a space limitation exists, we will prevent noise and vibration�... -
Page 10: Snow Depth Table
INSTALLATION Choosing a Location (cont�) GROUND SNOW DEPTH – INCHES ALABAMA INDIANA MINNESOTA NEW MEXICO PENNSYLVANIA VIRGINIA Huntsville Evansville Duluth Albuquerque Allentown Dulles Airport ARIZONA Fort Wayne International Falls Clayton Erie Lynchburg Flagstaff Indianapolis Minneapolis/St. Paul 50 Roswell Harrisburg National Airport Prescott South Bend Rochester... -
Page 11: Tools And Refrigerant
Ensure that servicing equipment is designed to operate with R-410A� • R-410A refrigerant cylinders are light rose in color� • R-410A, as with other HFCs, is only compatible with POE oils� • Vacuum pumps will not remove moisture from POE oil used in R-410A systems�... -
Page 12: Replacement Units
Only use evaporators matching coil is specifically designed to operate approved for use on R-410A systems that are with R-410A� DO NOT use an R-22 TXV or specifically matched with the outdoor unit per evaporator� The existing evaporator must the manufacturer’s specification sheets� Use... -
Page 13: Interconnecting Tubing And Fitting Losses
INSTALLATION Interconnecting Tubing (cont�) Interconnecting Tubing and tubing length, fittings, vertical separation, acces- sories, and filter dryers. The table below references Fitting Losses different commonly used equivalent lengths. Refrigerant tubing is measured in terms of actual length and equivalent length� Actual length is used for refrigerant charge applications�... -
Page 14: Long Line Set Applications
• Total Equivalent Length (ft.) = 75’ + 3.6’ = 78.6’ section of the I&O for detail� • Rounded-down value (ft.) = 75’ Liquid Line Size Liquid Line Elevation (Above or Below) Indoor Coil R-410A Size Liquid Line System Connection Size (Inch... -
Page 15: Suction Line Selection
INSTALLATION Interconnecting Tubing (cont�) Suction Line Selection Refrigerant Migration During Off Cycle Purpose of the suction line is to return superheated vapor to the condensing unit from the evaporator Long line set applications can require a consider- in cooling mode� While in heating mode the suction able amount of additional refrigerant�... - Page 16 INSTALLATION Interconnecting Tubing (cont�) For applications that are considered to have a long • Vapor line should slope toward the indoor unit line set with the outdoor unit and indoor unit on the • Follow the proper line sizing, equivalent length, same level the following is required: charging requirements, and oil level adjustments spelled out in this document and the outdoor...
- Page 17 INSTALLATION Interconnecting Tubing (cont�) Outdoor Unit Above Indoor Unit Outdoor Unit Above Indoor Unit Insulated liquid and Reference Table 2 suc on line for eleva on limita ons Verify sub-cooling prior to thro ling device TXV or EEV at indoor evaporator Figure 5 For applications that are considered to have a long...
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Page 20: Tubing Installation
• A high-quality biflow filter drier is included bends� with all R-410A heat pump units and must be • Locations where the tubing will be exposed to installed in the liquid line upon unit installation�... -
Page 21: Tubing Connections
INSTALLATION Interconnecting Tubing (cont�) • If tubing is to be run underground, it must be run in a sealed watertight chase� • Use care in routing tubing and do not kink or twist� Use a good tubing bender on the vapor line to prevent kinking�... -
Page 22: Leak Testing
INSTALLATION Interconnecting Tubing (cont�) The three stage inverter driven heat pumps are equipped with OD EXVs and matched to ID units that are also equipped with EXVs� During shipment, vibration has been found to move the EXV stem valve to a near closed position despite being set to a fully open position in the factory�... -
Page 23: Wiring
EcoNet™ communicating condensing unit� EcoNet™ Control • EcoNet™ communicating air handler or Communications EcoNet™ communicating furnace� The EcoNet™ enabled (-)P17 series of heat pumps • EcoNet™ control center� are designed to operate with conventional 24VAC Thermostat or an EcoNet™ communicating control IMPORTANT: center�... -
Page 24: Conventional 24Vac Thermostat Control Wiring
IMPORTANT: WIRE COLOR CODE The preferred method of unit installation and operation is by the EcoNet™ BK – BLACK GY – GRAY W – WHITE BR – BROWN O – ORANGE Y –... -
Page 25: Power Wiring
WIRING Control Wiring (cont�) TYPICAL 2-STAGE THERMOSTAT: HEAT PUMP WITH TYPICAL 2-STAGE THERMOSTAT AND DUAL-FUEL ELECTRIC HEAT APPLICATION Typical Two-Stage Thermostat Typical (-)P17 (-)H2T or (-)HMV Y1 Y2 E/W1 W2 C Two-Stage Furnace Heat Pump Air Handler Thermostat Control Outdoor Unit (-)P17 W/BK Heat Pump... -
Page 26: Grounding
WIRING Control Wiring (cont�) Grounding Power wiring must be run in a rain-tight conduit� WARNING: The unit must be Conduit must be run through the connector panel permanently grounded� Failure to do so can cause below the access cover (see page 6) and attached electrical shock resulting in severe personal injury or to the bottom of the control box�... -
Page 27: Start-Up
START-UP Start-Up Connect the communicating system according to the wiring diagram on page 17� Once all devices are connected, power up the line and low voltage to the system� When all devices are powered, the thermostat should detect the indoor and outdoor units within 45 seconds�... -
Page 28: Evacuation Procedure
START-UP Evacuation and Leak Testing SENSIBLE HEAT SENSIBLE HEAT ALTITUDE ALTITUDE CONSTANT CONSTANT (FEET) (FEET) (SHC) (SHC) Sea Level 1�08 6000 0�87 1�07 7000 0�84 1�05 8000 0�81 1000 2000 1�01 9000 0�78 3000 0�97 10000 0�75 • After adequate evacuation, open both service 4000 0�94 15000... -
Page 29: Checking Refrigerant Charge
New installations utilizing either an RCF indoor 1� With an R-410A gauge set, attach the high- coil installed on a gas furnace or an RH series air pressure hose to the access fitting on the liquid handler in the downflow or horizontal right-hand line (small) service valve at the OD unit�... -
Page 30: Setting Compressor Speed
START-UP Checking Refrigerant Charge (cont�) With an accurate scale (+/– 1 oz. [28.3 g]) or 2� After this time the dual seven segment LEDs will show the first menu option (FC)� volumetric charging device, adjust charge difference between that shown on the unit data 3�... -
Page 31: Final Charge By Subcooling
Evaporator load (indoor coil in cooling mode/outdoor Pressure Chart below to note the corresponding coil in heating mode) will cause pressures to deviate� saturation temperature for R-410A at the Note that all systems have unique pressure curves� measured liquid pressure�... -
Page 32: Start-Up
Systems should not be fine- be performed by trained and qualified HVAC tune charged below 40°F [4�4°C] outdoor dry bulb� professionals� For technical assistance, contact your Distributor Service Coordinator� TEMPERATURE PRESSURE CHART SATURATION R-410A SATURATION R-410A SATURATION R-410A SATURATION R-410A... -
Page 33: Components And Controls
420 PSIG� comes first, before opening to a wide open The (-)P17 EcoNet™ enabled three stage variable position� speed heat pumps are equipped with a pressure • The outdoor fan will remain operating for the transducer for low pressure control, diagnostic, compressor off delay (5min)�... -
Page 34: Accumulator
COMPONENTS AND CONTROLS High- and Low-Pressure Controls (HPC and LPC) (cont�) • If a demand persists after the delay but the communicate the lockout fault to the EcoNet™ suction pressure has not recovered, the control center when used in communicating outdoor fan will be turned off�... -
Page 35: Alternate Suction Line Thermistor
COMPONENTS AND CONTROLS Alternate Section Line Thermistor (OST) IMPORTANT: The EcoNet™ enabled (-)P17 three stage variable The clamp on the vapor speed heat pumps are equipped with an alternate line thermistor securely attaches to the alternate suction line thermistor for the purposes of suction line at the 10 to 2 o’clock position with a... -
Page 36: Suction Pressure Transducer (Spt)
COMPONENTS AND CONTROLS Suction Pressure Transducer (SPT) The EcoNet™ enabled (-)P17 three stage variable speed heat pumps are equipped with a 5vdc powered suction line pressure transducer� This device has an internal diaphragm that changes the resistance in line with the input voltage to return a modified voltage that is scalled from 0�5 to 4�5vdc�... -
Page 37: Choke/Inductor
COMPONENTS AND CONTROLS Power Inverter Compressor Controls (cont�) the power inverter will continually attempt to raise 4� High Pressure control connection (HPS) – with the compressor speed to maximize performance automatic reset and conditioned space comfort� 5� Discharge line thermistor connection (Sensor) 1. -
Page 38: Unitary Control
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control The EcoNet™ system is the next generation of 17� Dual seven segment LED – Displays status, the integrated compressor control (ICC) and is an diagnostic codes, fault recall, compressor integral part of the EcoNet™... -
Page 39: Memory Card
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) Memory Card • The memory card stores all unit information. • The unit information is called model data. • The model data is all the information needed for proper unit operation�... - Page 40 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control Installation Verification 4) High-Stage Heating Operation – When the • 24 VAC power on R and C must be present at ICC receives a call for second-stage heating the ICC for it to operate�...
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Page 41: Compressor Operation
Compressor Operation control center where it will relay the information to the indoor air mover� When the (-)P17 heat The (-)P17 series of EcoNet™ compatible outdoor pump is matched with a constant torque indoor heat pumps are equipped with legacy and air handler, there will only be 2 airflows requested�... -
Page 42: Demand Defrost
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) temperature and the saturated suction temperature - No action for 5 seconds in the root menu (aka sump superheat)� If the ICC concludes that structure will return the control to normal the sump superheat is below the design limit, operation�... - Page 43 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) Coil Temperature (EVAPIN) to determine when a • When the noise abatement period is concluded the reversing valve will be energized� defrost cycle is required� • The ICC will re-energize the outdoor fan output.
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Page 44: Active Compressor Protection Mode
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) Field Defrost Testing L8 – Compressor Model Unknown – A900_O • To test the defrost control, the coil temperature Inverter Identity Fault must be below 70°F [21�1°C]� If the inverter compressor model is not set, the inverter will keep the compressor from operation�... - Page 45 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) IMPORTANT: L15 – PIM Over-temp – T908_O Inverter Fault This mode of active If the inverter detects an over temperature protection must be manually reset condition in the Power Module circuit the inverter will automatically shut the compressor off and keep it from operation�...
- Page 46 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) IMPORTANT: automatically shut the compressor off and keep it This mode of active from operation� If this fault occurs 3 times during protection must be manually reset� one call for operation the ICC will lock out the compressor to keep it from continuing to operate and flash an ”L”...
- Page 47 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) IMPORTANT: This mode of active protection must be manually reset� L16- Microprocessor Fault – A912_O Inverter Fault If the inverter identifies faulty microprocessor the inverter will automatically shut the compressor L16 – Com/DSP Comm Fault – A920_O Inverter off and keep it from operation�...
- Page 48 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) compressor to keep it from continuing to operate 16 – HP Sensor Not Configured – T926_O and flash an ”L” on the dual 7-segment LEDs If the inverter is not configured or does not hold followed by a 16�...
- Page 49 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) increases to ≥187VAC. At this time the ICC will Active Protection – Code restart the compressor� While the compressor is 21L – Open low-pressure off the ICC will display a 27 on the dual 7-segment control LEDs�...
- Page 50 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) IMPORTANT: For a single stage or two stage system it is very common during startup and shutdown for the compressor to venture outside the designed operating envelope� It is possible this fault can be seen on an installation 83 –...
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Page 51: Default Operations Upon Component Failure
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) Default Operations Upon D1 – Memory Card Configuration Data Write Failure – A951_O Component Failure If the ICC identifies issue(s) writing the model data If any of the following components on the (-)P17... -
Page 52: Agency Test Mode Instructions
COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) flashing “c,” “C,” “h,” or “H” is displayed on 1� Supply a Y ONLY signal to the ICC� (NOTE: for the dual 7-segment LEDs) and a call for unit heating also supply a 24VAC signal to the “B”... - Page 53 COMPONENTS AND CONTROLS EcoNet™ Variable Speed Unitary Control (cont�) 5� Press the TEST button one time� The dual 1. Supply a Y+Y2 signal to the ICC. (NOTE: for 7-segment display will show a “CS”, which heating also supply a 24VAC signal to the “B”...
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Page 54: Accessories
ACCESSORIES Communicating 2-Wire Kit WARNING: Turn off electric power (Part No. RXME-A02) at the fuse box or service panel for at least 1 minute before making any electrical connections� This kit allows the outdoor unit to operate with Also, the ground connection must be completed only 2 control wires�... -
Page 55: Diagnostics
ICC (Integrated Compressor Control) provide status and diagnostic information that Control Board greatly enhances the ability to quickly diagnose Each control board in the EcoNet™ system faults� Use the following troubleshooting Communication Network needs information guides as another tool in system diagnostics�... -
Page 56: Icc Diagnostic Codes
DIAGNOSTICS ICC Diagnostic Codes Descriptions of the ICC diagnostic codes are provided below: NOTE: Codes must be read from correct side to avoid an error in reading codes� Dual 7-Segment Status/Possible Cause – LEDs Display Diagnostic Description Troubleshooting Information Code c –... - Page 57 DIAGNOSTICS Dual 7-Segment Status/Possible Cause – LEDs Display Diagnostic Description Troubleshooting Information Code L8 – Compressor Model Unknown • Check model data card is properly connected A900–O Inverter Identity Fault • Cycle power – remove power until all the lights •...
- Page 58 DIAGNOSTICS Dual 7-Segment Status/Possible Cause – LEDs Display Diagnostic Description Troubleshooting Information Code 21L – Active Protection Low-Pressure • LPC has opened 3 times in the same cooling Control Trip operation, the ICC has locked out the compressor FLASHING 27 – AC Input Under Voltage – •...
- Page 59 DIAGNOSTICS Dual 7-Segment Status/Possible Cause – LEDs Display Diagnostic Description Troubleshooting Information Code L36 – Suction Pressure Sensor Failure – • Check pressure transducer wiring harness for • continuity while attached to sensor. A956 • Check 5Vdc is constant between black and red •...
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Page 60: Electrical, Mechanical Checks Flowcharts
DIAGNOSTICS Electrical Checks Flowchart THERMOSTAT CALL FOR COOLING, NO COOLING Refer to the ICC Diagnostics Codes section from this Outdoor Unit manual for fault code troubleshooting. Running Check fault history for other faults. 7-Segment Check control voltage (R and C) to control. Check transformer Display Lit? Check 3A fuse on... - Page 61 DIAGNOSTICS Cooling Mechanical Checks Flowchart Outdoor Unit Running? Go to Electrical Checks Flowchart Pressure Problems? High Head Pressure or Low Liquid Low Suction Compressor Envelope Pressure Pressure Protection Low on Dirty Filters Charge Dirty Outdoor Coil Low Ambient Dirty Indoor Coil Inoperative Outdoor Temperature Inadequate Indoor...
- Page 62 DIAGNOSTICS Heating Mechanical Checks Flowchart Outdoor Unit Running? Go to Electrical Checks Flowchart Pressure Problems? Low Liquid Low Suction High Liquid Pressure or Pressure Pressure Compressor Envelope Protection Low on Dirty Outdoor Coil Charge Dirty Indoor Coil Low Indoor Inadequate Outdoor Temperature Airflow Inoperative Indoor...
- Page 63 DIAGNOSTICS Defrost Mechanical Checks Flowchart Defrost System Incomplete Excessive Defrost Defrost Defrost Reversing Valve Sensor in Wrong Sensor in Wrong Stuck Location Location Welded Reversing Valve Wrong Defrost Low System Relay on Control Board Timer Setting Charge Loose Defrost Wind Affecting Failed Defrost Relay Sensor in Defrost...
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Page 64: General Troubleshooting Chart
DIAGNOSTICS General Troubleshooting Chart WARNING: Disconnect all power to side� Failure to shut off power can cause electrical unit before servicing� Contactor may break only one shock resulting in personal injury or death� SYMPTOM POSSIBLE CAUSE REMEDY Unit will not run •... -
Page 65: Service Analyzer Charts
DIAGNOSTICS Service Analyzer Charts COMPRESSOR OVERHEATING – HIGH DISCHARGE TEMP SYMPTOM POSSIBLE CAUSE CHECK/REMEDY High superheat Low charge Check system charge. (greater than 15°F [-9°C] at coil) Verify suction thermistor operation (10k thermistor) Replace thermistor. Verify pressure transducer operation input and Replace thermistor and/or harness and/or control output voltage board. - Page 66 DIAGNOSTICS Service Analyzer Charts COMPRESSOR OVERHEATING – HIGH DISCHARGE TEMP (cont.) SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES Short cycling of Low charge Check system charge. compressor (cont.) Dirty coil Duct too small or restricted Faulty run capacitor Replace. Faulty internal overload Replace compressor.
- Page 67 DIAGNOSTICS Service Analyzer Charts CONTAMINATION SYMPTOM POSSIBLE CAUSE REMEDY Moisture Poor evacuation on installation or during service In each case, the cure is the same. Recover refrigerant. High head pressure Noncondensibles air Unusual head and Wrong refrigerant or mixed refrigerants suction readings Foreign matter –...
- Page 68 DIAGNOSTICS Service Analyzer Charts FLOODING SYMPTOM POSSIBLE CAUSE REMEDY Bad pressure reading Check transducer wiring. Suction thermistor in wrong location Relocate thermistor. Poor system control using an EXV Bad suction thermistor Replace thermistor. Improper superheat setting (less than 5°F [-15°C]) Adjust EXV SH setpoint dipswitches and validate valve operation.
- Page 69 DIAGNOSTICS Service Analyzer Charts ELECTRONIC EXPANSION VALVES (cont.) SYMPTOM POSSIBLE CAUSE REMEDY ICC dc circuit failed Verify 5Vdc to pressure transducer is present. If not, replace ICC. High superheat adjustment Change the superheat offset dip switches to increase superheat. Moisture causing valve to stick open. Recover refrigerant, replace filter-drier, evacuate system, and recharge.
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Page 70: Service Analyzer Charts
DIAGNOSTICS Service Analyzer Charts ELECTRONIC EXPANSION VALVES (cont.) SYMPTOM POSSIBLE CAUSE REMEDY Unequal evaporator circuit loading Ensure airflow is equally distributed through Superheat is low evaporator. to normal with low suction pressure Check for blocked distributor tubes. Low load or airflow entering evaporator coil Ensure blower is moving proper air CFM. -
Page 71: Icc Diagnostic Codes
DIAGNOSTICS ICC Diagnostic Codes ICC D iagnostic C odes Dual 7-‐Segment Diagnostic Description Status/Possible Cause – Troubleshooting LEDs Display Code Information L 8 Compressor Model Unknown – -‐Check model data card is properly A900_O Inverter Identity Fault ... - Page 72 DIAGNOSTICS ICC Diagnostic Codes (cont�) -‐ Check Thermistor continuity. The discharge thermistor is a 10k thermistor. See the 10k thermistor chart for correct resistance value. L18 Communication Failure – A915 -‐ Verify communication cable connection Inverter Fault ...
- Page 73 DIAGNOSTICS ICC Diagnostic Codes (cont�) servicer manual gauge readings. -‐On a communicating system verify that the voltage readings convert to the displayed pressure listed on the control center. -‐If all voltage measurements convert to a similar pressure as displayed by the ...
- Page 74 DIAGNOSTICS ICC Diagnostic Codes (cont�) between the black wire and the other 4 wires. If none of the above rectifies the issue, replace EXV and filter drier and recharge. ICC dc circuit failed Verify 5Vdc to pressure transducer ...
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Page 75: Icc Diagnostic Codes
DIAGNOSTICS ICC Diagnostic Codes (cont�) Superheat is low to normal with low Unequal evaporator circuit loading Ensure airflow is equally distributed suction pressure through evaporator. Check for blocked distributor tubes. Low load or airflow entering evaporator Ensure blower is moving proper air CFM. ... -
Page 76: Cooling And Heating Mode Troubleshooting Tips
DIAGNOSTICS COOLING MODE TROUBLESHOOTING TIPS INDICATORS SYSTEM DISCHARGE SUCTION SUPERHEAT SUBCOOLING COMPRESSOR PROBLEM PRESSURE PRESSURE Normal: 5°–15°F Normal: See AMPS [-15° – -9°C] Charging Chart High High High High Overcharge High Undercharge Liquid Restriction High High (Drier) Low Indoor Airflow High High High... -
Page 77: Wiring Diagram
WIRING DIAGRAM... - Page 80 CM 1015...
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