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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.
Printed in USA
92-104921-27-01 ( / )
VARIABLE SPEED R-410A
HEAT PUMP/AIR CONDITIONER
OUTDOOR UNITS
Enabled
INSTALLATION INSTRUCTIONS
(-)A18AZ & (-)P18AZ (18 SEER2)
EQUIPPED WITH ECONET™
COMMUNICATIONS
ISO 9001:2015
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Table of Contents
Troubleshooting
Related Manuals for Rheem A18AZ Series
Summary of Contents for Rheem A18AZ Series
- Page 1 VARIABLE SPEED R-410A WARNING: RECOGNIZE THIS SYMBOL HEAT PUMP/AIR CONDITIONER AS AN INDICATION OF IMPORTANT SAFETY INFORMATION OUTDOOR UNITS WARNING THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED SERVICE PERSONNEL FOR Enabled PROPER INSTALLATION, ADJUSTMENT, AND OPERATION OF THIS UNIT. INSTALLATION INSTRUCTIONS READ THESE INSTRUCTIONS THOROUGHLY BEFORE...
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Page 2: Table Of Contents
Contents 8.5 High Discharge Pressure..................32 8.6 Low Suction Pressure/Loss of Charge ..............32 1.0 IMPORTANT SAFETY INFORMATION ............3 8.7 Compressor Shut-Down Sequence for High or Low Refrigerant Pressure Fault .. 33 2.0 GENERAL INFORMATION ................4 8.8 Overcurrent and Current Imbalance ............... 33 2.1 Introduction ....................4 8.9 Compressor Operation Outside Envelope ............. -
Page 3: Important Safety Information
1.0 IMPORTANT SAFETY INFORMATION WARNINGS: CAUTIONS: • These instructions are intended as an aid to • R-410A systems operate at approximately 60% higher qualified, licensed service personnel for proper pressures (1.6 times) than R-22 systems. Do not use installation, adjustment, and operation of this unit. R-22 service equipment or components on R-410A Read these instructions thoroughly before attempting equipment. -
Page 4: General Information
2.0 GENERAL INFORMATION IMPORTANT: This product has been designed and manufactured WARNING: to meet certified AHRI capacity and efficiency ratings with the appropriate outdoor units. However, proper refrigerant charge, Improper installation, or installation not made in proper airflow, and refrigerant line sizing are critical to achieve accordance with these instructions, can result in optimum capacity and efficiency and to assure reliable operation. -
Page 5: Importance Of Proper Indoor/Outdoor Match-Ups
W = FUTURE REFRIGERANT REGION C = COLD CLIMATE SEER2 PRODUCT CATEGORY P = HEAT PUMP D = SIDE DISCHARGE HEAT PUMP A = AIR CONDITIONER BRAND R = RHEEM U = RUUD S = SURE COMFO ML = MAINLINE... -
Page 6: Unit Specifications
3.0 UNIT SPECIFICATIONS 3.2 Electrical and Physical Data Table 2: Electrical Data Compressor Fuse or HACR Circuit Breaker Model Phase Fan Motor Minimum Circuit Number Frequency (Hz) Full Load Rated Load Locked Rotor Minimum Maximum Ampacity Amperes (-)P18AZ Voltage (Volts) Amperes (FLA) Amperes (RLA) Amperes (LRA) -
Page 7: Installation
4.0 INSTALLATION higher pressures. It cannot be retrofitted into R-22 heat pumps. 4.1 Tools and Refrigerant Physical Properties: R-410A has an atmospheric boiling point of -62.9°F [-52.7°C] and its saturation 4.1.1 Tools Required for Installing pressure at 77°F [25°C] is 224.5 psig [1,548 kPa]. Composition: R-410A is a near-azeotropic mixture of and Servicing R-410A Models 50% by weight difluoromethane (HFC-32) and 50% by... -
Page 8: Choosing A Location
4.2 Choosing a Location 4.2.1 Allowable Clearances gas and electric meters, dryer vents, and exhaust and inlet openings. In the absence of national 12" [30.5 cm] to side intake louvers codes or manufacturers’ recommendations, local 24" [61.0 cm] to service access panels code recommendations and requirements will take 60"... -
Page 9: Customer Satisfaction Issues
metal frame, wooden frame, or 4” x 4” [10.2 cm x 10.2 WARNING: cm] wooden stringers. It is extremely important to properly secure the unit to the pad or frame so it does Disconnect all power to unit before starting not shift during high winds, seismic events, or other maintenance. -
Page 10: Refrigerant Line Set Selection
slab, observe the following guidelines. of operating time. Only use the vapor line sizes listed in Table 2 to assure proper oil return. DO NOT • If elevating a unit on a flat roof, use 4" x 4" [10.2 cm x 10.2 cm] or equivalent stringers oversize vapor line! 4.4.2.2 Refrigerant Migration During Off positioned to distribute unit weight evenly and... -
Page 11: Liquid Line Selection
4.4.3 Line Set Length and Fitting Losses Refrigerant tubing is measured in terms of actual length and equivalent length. Actual length is used for refrigerant charge applications. Equivalent length takes into account pressure losses from tubing length, fittings, vertical separation, accessories, and filter driers. The table below references different commonly used equivalent lengths. -
Page 12: Vapor Line Selection
4.4.5 Vapor Line Selection The purpose of the vapor line is to return superheated vapor to the condensing unit from the indoor coil in the cooling mode. While in the heating mode, the vapor line transports discharge vapor to the indoor coil from the outdoor unit. - Page 13 Table 6B: Refrigerant Line Sizing Chart (Metric Units) 18 SEER2 Variable Speed Outdoor Units Outdoor Unit ABOVE or BELOW Indoor Unit Allowable Allowable Equivalent Length (Feet) Liquid Line Vapor Line Unit Size Size Size < 8 8-15 16-23 24-30 31-38 39-46 mm [in.] mm [in.]...
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Page 14: Line Set Installation
4.5 Line Set Installation • Check Table 5 for the correct vapor line size and 1. Use care in routing tubing and do not kink or liquid line size. twist. Use a good quality tubing bender on the • If a portion of the liquid line passes through a vapor line to prevent kinking. -
Page 15: Relative Location Of Indoor And Outdoor Units
4.5.2 Relative Location of Indoor and Outdoor Units Item Descripton Number Reference Table 6 For Maximum Length Limitations Ideally, Line Set Slopes Away From Outdoor Unit. Verify Sub-Cooling Prior To Expansion Device, Insulated Liquid Line In Unconditioned Space For Long Line Applications. ST-A1219-01-01 Insulated Vapor Line Full Length Figure 8: Slop Vapor Line Toward the Indoor Unit... -
Page 16: Outdoor Unit Below Indoor Coil (Long Line Set Applications)
Item Descripton Number Insulated Vapor Line Full Length Inverted Trap Even With Top Of The Coil Verify Liquid Subcooling Prior To Expansion Device In The Cooling Mode Insulate Liquid Line In Unconditioned Space For Long Line Applications ST-A1219-02-01 Reference Table 6 For Maximum Length And. Vertical Separation Limitations Figure 9: Long Line Liquid Line Routing 4.5.2.2 Outdoor Unit Below Indoor Coil (Long Line Set Applications) - Page 17 Item Number Descripton Insulated Vapor Line Full Length Verify Liquid Sub-Cooling At Outdoor Unit Prior To Expansion Device Insulated Liquid Line In Unconditioned Space For Long Line Application. Reference Table 6 For Maximum Length And Vertical Separation Limitations. Figure 10: Liquid Line Routing for Unit Installed Above Indoor Coil 4.5.2.3 Outdoor Unit Above Indoor Coil For applications with the outdoor unit above the indoor coil the following is required: 1.
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Page 18: Tubing Connections
4.5.3 Tubing Connections Indoor coils have only a holding charge of dry nitrogen. Keep all tube ends sealed until connections are to be made. 1. Use type “L” copper refrigeration tubing. Braze the connections with the following alloys: • – Copper to copper, 5% silver minimum •... -
Page 19: Initial Leak Testing
4.6 Initial Leak Testing Indoor coils have only a holding charge of dry nitrogen. Keep all tube ends sealed until connections are to be made. WARNING: Do not use oxygen to purge lines or pressurize system for leak test. Oxygen reacts violently with oil, which can cause an explosion resulting in Figure 19: Insulate Vapor Line severe personal injury or death. -
Page 20: Final Leak Testing
4.9.1 EcoNet Communications ™ The EcoNet enabled (-)A18AZ/(-)P18AZ Series heat pumps and air conditioners are specifically designed to be matched with and EcoNet enabled air-handler or gas furnace and the EcoNet Control Center. While they can be controlled by conventional 24 VAC control wiring and a conventional thermostat for temporary emergency situations until communication issues are resolved. -
Page 21: Conventional 24Vac Thermostat Control Wiring Connections
IMPORTANT: The EcoNet™ control system requires system at nominal capacity. IMPORTANT: The preferred method of unit continuous 18 AWG thermostat wire. Do not use phone cord to connect indoor and outdoor units. This installation and operation is by the EcoNet™ will damage the controls. -
Page 22: Power Wiring
Conduit must be attached to the hole in the Typical bottom of the control box. Single-Stage Furnace Heat Pump/AC 4. Connect power wiring to line-voltage lugs on the Thermostat Control Outdoor Unit terminal block located in the outdoor heat pump unit electrical box. -
Page 23: System Start-Up & Refrigerant Charging
5.0 SYSTEM START-UP & REFRIGERANT CHARGING 5.1 System Start-Up Overview and indoor air-flow which is necessary for accurate indoor air-flow verification and refrigerant charging. Once the system hardware and wiring has been Check to make sure "On-Demand Dehumidification" properly installed, the next step is to start the system is turned off in the EcoNet™... -
Page 24: Indoor Air-Flow Verification
2. Adjust the set point several degrees below Table 9: Cooling and Heating CFM Ratings (cool mode) or above (heat mode) the room Displayed Displayed temperature to assure the thermostat is Outdoor Unit Indoor CFM Indoor CFM calling for operation and will continue to do so Model No. -
Page 25: Measurement Device Set-Up
5.8.1 Measurement Device Set-Up 1. With an R-410A gauge set, attach the high- pressure hose to the access fitting on the liquid line (small) service valve at the OD unit. 2. Attach the low-pressure hose to the exterior suction port located between the two service valves that is connected to the suction tube between the reversing valve and compressor. -
Page 26: R-410A Temperature Pressure Chart
given outdoor and indoor conditions, remove charge. 5.8.4 Final Charging by Liquid Subcooling 1. After preliminary charging by weight or pressures, find the design subcooling value. The correct subcooling value is found at the intersection of the installed system and the outdoor ambient temperature on the Charging Chart located inside the access panel cover. -
Page 27: Normal Sequence Of Operation
6.0 NORMAL SEQUENCE OF OPERATION The following sections provide details on how the (-) the building load until the maximum compressor speed A18AZ/(-)P18AZ outdoor heat pump systems are is reached. Since the noise level of the compressor designed to operate under normal conditions. Under increases as speed increases, the maximum allowable abnormal conditions, Active Compressor and Inverter compressor speed in the Overdrive Mode can be... -
Page 28: Supplemental Electric Heat In Heating Mode
card and directs the EcoNet enabled air-handler or “demand defrost” that initiates a defrost cycle only gas furnace control board to deliver an appropriate when frosting is detected on the outdoor coil during indoor air-flow level based on the capacity percentage heating operation. -
Page 29: Sequence Of Operation For Conventional 24Vac Thermostat Controls
operation as directed by the EcoNet instead of a variable speed system. Control Center. • When a call for cooling or heating is received NOTE: Should the outdoor ambient temperature from the thermostat, the compressor will start and thermistor fail, the UODC will initiate a defrost operate at the nominal capacity level and the (-) every 34 minutes of operation when the coil HMV air-handler will deliver the nominal air-flow... -
Page 30: Board Features And Connections
7.0 COMPONENTS & CONTROLS 7.1 EcoNet Universal Outdoor Control (UODC) ™ Figure 30: EcoNet™ Universal Outdoor Control (UODC) Connection Diagram ST-A1324-04 Table 12: Features on the UODC and Location of Each Item Number Component Feature Item Number Component Feature Bluetooth Common Discharge Temp Pressure Relief Valve... -
Page 31: Power Inverter Compressor Control
Table 13: Features on the Power Inverter Compressor Control Item Number Component Feature Input Power RS485 Communication Fan Motor Compressor Figure 31: Power Inverter Compressor Control Diagram 7.1.2 Factory Superheat Setting designed and qualified for that specific model to provide reliable operation under the most extreme The UODC is pre-programmed with the optimum conditions. -
Page 32: Active System Protection Features
8.0 ACTIVE SYSTEM PROTECTION FEATURES 8.5 High Discharge Pressure The controls found in the (-)A18AZ/(-)P18AZ heat pumps are designed to prevent the system from The High Pressure Control (HPC) limits the compressor operating in under conditions that could be harmful to discharge pressure to a safe level to prevent damage the compressor and inverter. -
Page 33: Compressor Shut-Down Sequence For High Or Low Refrigerant Pressure Fault
8.10 Over and Under Voltage clear the fault. This is accomplished by disconnecting the electrical power to both the indoor and outdoor If the supply voltage or internal DC voltage is not units for 1 minute and then reconnecting power. within an acceptable operating range, the inverter will NOTE: If the system experiences a low refrigerant shut the compressor off until the voltage returns to an... -
Page 34: Diagnostics & Troubleshooting
Table 14: Sensor Failure Identification Chart FAILED COMPONENT FUNCTION DEFAULT OPERATION Low Ambient Cooling No Low Ambient function Defrost Defrost will be initiated based on coil temperature and time Outdoor Sensor (OAT) No delay functions if failure is open or short. Continue function One minute fan off delay on COOL mode for a thermistor range error. - Page 35 Table 15: EcoNet Fault Codes & Response Actions (cont.) EcoNet Fault Code Response Action A980_O Fan Self Check Fault Lockout while active, short cycle to restart. A987_O Compressor Loss of Phase 3-strikes to permanent lockout A988_O Compressor Control Lost 3-strikes to permanent lockout A989_O Charge Relay Open 3-strikes to permanent lockout A990_O Compressor U-Phase Over Current...
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Page 36: Checking Transducers & Temperature Sensors
Table 15: EcoNet Fault Codes & Response Actions (cont.) EcoNet Fault Code Response Action T974_O Line Current Trip 3-strikes to permanent lockout T981_O Fan Overcurrent Trip 3-strikes to permanent lockout T982_O Fan Overvoltage Trip 3-strikes to permanent lockout T983_O Fan Undervoltage Fault 3-strikes to permanent lockout T984_O Fan Locked Rotor Fault 3-strikes to permanent lockout... - Page 37 77ºF (25ºC). This means, a sensor exposed to 77ºF Apply resistance measurements to Table 15 and will show a resistance of 10,000 Ohms +/- 1%. As compare to the control. the temperature decreases, the resistance increases. 32º will have a resistance +/- 1% of 32,650 Ohms. Alternatively, as the temperature increases, the In the event Celsius is being used, the Fahrenheit resistance decreases.
- Page 38 9.2 General Troubleshooting Guide WARNING: Disconnect all power to unit before servicing. Contactor may break only one side. Failure to shut off power can cause electrical shock resulting in personal injury or death. Table 17: Troubleshooting Guide SYMPTOM POSSIBLE CAUSE REMEDY Unit will not run •...
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Page 39: Service Analyzer Charts
9.3 Service Analyzer Charts Table 18: Service Analyzer Chart COMPRESSOR OVERHEATING – HIGH DISCHARGE TEMP SYMPTOM POSSIBLE CAUSE REMEDY Low charge Check system charge. Verify suction thermistor operation Replace thermistor. (10k thermistor) Verify pressure transducer operation input and Replace thermistor and/or harness and/or control board. output voltage Restricted cap tube, EXV Faulty metering device, inadequate suction... - Page 40 Table 18: Service Analyzer Chart (cont.) COMPRESSOR OVERHEATING – HIGH DISCHARGE TEMP (cont.) SYMPTOM POSSIBLE CAUSE REMEDY Low charge Check system charge. Dirty coil Short cycling of Low evaporator airflow Dirty filter compressor (cont.) Duct too small or restricted Faulty internal overload Replace compressor.
- Page 41 Table 18: Service Analyzer Chart (cont.) LOSS OF LUBRICATION SYMPTOM POSSIBLE CAUSE REMEDY Compressor failures Vapor line tubing too large Reduce tubing size to improve oil return. Low charge Check system charge. Low suction pressure Refrigerant leaks Repair and recharge. Cold, noisy compressor –...
- Page 42 Table 18: Service Analyzer Chart (cont.) ELECTRONIC EXPANSION VALVES SYMPTOM POSSIBLE CAUSE REMEDY Recover charge, replace filter-drier, evacuate system, Moisture freezing and blocking valve recharge. Dirt or foreign material blocking valve Recover charge, replace filter-drier, evacuate system, recharge Low refrigerant charge Correct the charge.
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Page 43: Troubleshooting Tips
Table 18: Service Analyzer Chart (cont.) ELECTRONIC EXPANSION VALVES (cont.) SYMPTOM POSSIBLE CAUSE REMEDY Refrigerant drainage from flooded evaporator Compressor flood Install trap riser to the top of the evaporator coil. back upon start-up Inoperable stator heat Recover refrigerant, replace filter-drier, evacuate system, and recharge. -
Page 44: Outdoor Unit Maintenance
Table 20: Heating Mode Trouble Shooting Tips INDICATORS SYSTEM SUPERHEAT SUBCOOLING DISCHARGE SUCTION PROBLEM Normal: 5°–15°F Normal: See PRESSURE PRESSURE [2.8° – 8.3°C] Charging Chart Overcharge High High High Undercharge OK or High Liquid Restriction High High (Filter Drier) Low Outdoor Airflow Dirty Indoor Coil High High... -
Page 45: Wiring Diagram
11.0 WIRING DIAGRAM Figure 32: (-)A18AZ Wiring Diagram & Schematic Diagram... - Page 46 Figure 33: (-)P18AZ Wiring Diagram & Schematic Diagram...
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Page 47: Appendix
12.0 APPENDIX 12.1 Agency Performance Audit Test Instructions Performance audit testing a (-)A18AZ/(-)P18AZ to the “Enable Dehumidification ?” label. variable speed heat pump rated combination requires c. To turn dehumidification off press the orange up an EcoNet™ Control Center (according to the AHRI or blue down arrows once. - Page 48 button until “stop test” appears at the bottom of NOTE: While the test mode is active the thermostat the “installer checkout” screen. Then press the will not permit return to the home screen. “Stop” button. a. To turn the unit off either press the blue down 8.