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24VNA0, 25VNA0
Infinityt Variable Speed Air Conditioner and Heat Pump
with Greenspeedt Intelligence
2 to 5 Nominal Tons
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WIRING DIAGRAMS
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Service Manual
TABLE OF CONTENTS
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Table of Contents
Related Manuals for Carrier Infinity 25VNA0
Summary of Contents for Carrier Infinity 25VNA0
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Page 1: Table Of Contents
24VNA0, 25VNA0 Infinityt Variable Speed Air Conditioner and Heat Pump with Greenspeedt Intelligence 2 to 5 Nominal Tons Service Manual TABLE OF CONTENTS PAGE UNIT IDENTIFICATION ................. . SAFETY CONSIDERATIONS . -
Page 2: Unit Identification
UNIT IDENTIFICATION The unit is identified using a 16 digit model number structure. It is recommended providing the complete 16 digit model number when ordering replacement parts to insure receiving the correct parts. MODEL NUMBER NOMENCLATURE Product Series 24 = Air Conditioner SEER Undefined 25 = Heat Pump... -
Page 3: Safety Considerations
SAFETY CONSIDERATIONS Installation, service, and repair of these units should be attempted WARNING only by trained service technicians familiar with standard service instruction and training material. UNIT OPERATION AND SAFETY HAZARD All equipment should be installed in accordance with accepted practices and unit Installation Instructions, and in compliance with Failure to follow this warning could result in personal all national and local codes. -
Page 4: Electrical
ELECTRICAL 3. Reconnect leads and apply low- -voltage power to contactor coil. This may be done by leaving high- -voltage power to outdoor unit off and turning thermostat to cooling. Check WARNING voltage at coil with voltmeter. Reading should be between 20v and 30v. -
Page 5: Circuit Board
Circuit Board Crankcase Heater Operation The variable speed circuit board is a serially communicating device This unit has an internal crankcase heater that will be energized that receives capacity demands from the Infinity wall control and during the off cycle and is intelligently demanded by the system to communicates corresponding speed request to the Inverter Drive, prevent the compressor from being the coldest part of the system which controls compressor to the speed demanded. -
Page 6: Communication And Status Function Lights
Communication and Status Function Lights Defrost (25VNA0) Infinity Control, Green Communications (COMM)Light This user interface (UI) offers 5 possible defrost interval times: 30, 60, 90, 120 minutes, or AUTO. The default is AUTO. A green LED (COMM light) on the outdoor board (see Fig. 2) indicates successful communication with the other system Defrost interval times: 30, 60, 90, and 120 minutes or AUTO are selected by the Infinity Control User Interface (dip switches are not... - Page 7 Fig. 3 – Wiring Diagram — 24VNA0 Model sizes 2 - - 5 tons, 208/230- -1...
- Page 8 COMP CONNECTION DIAGRAM SCHEMATIC DIAGRAM (LADDER FORM) CONT COMPONENT ARRANGEMENT TRAN 24V CHOKE INVERTER CHOKE TRAN CONT 230V 208V COM CONT EQUIP CONTROL BOARD CHOKE CHOKE CONT INVERTER TRAN 11 21 MODEL PLUG CHART 230V 208/230 1Ø MODEL MODEL PIN RESISTANCE (K POWER 23 23 PLUG...
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Page 9: Troubleshooting
TROUBLESHOOTING 8. In the event of a low- -pressure trip or low- -pressure lockout, check the refrigerant charge and indoor airflow (cooling) Systems Communication Failure and outdoor fan operation and outdoor coil in heating. If communication with the Infinity control is lost with the User Low Pressure Protection Interface (UI), the control will flash the appropriate fault code (See The outdoor unit is equipped with low pressure transducer. -
Page 10: Suction Pressure Transducer (Spt)
25VNA0 Outdoor Coil Thermistor 24VNA0 Suction Thermistor (OST) The outdoor coil thermistor is a 10Kohm resistor used for multiple Suction Thermistor is used for compressor protection and must be system operations. It provides the coil/liquid line temperature to secured on the suction tube and aligned longitudinally to the the HP board and user interface. -
Page 11: Variable Speed Compressor Sensor Output Terminals
Variable Speed Compressor Power Input Terminals read the DC voltage between ground and supply (input) terminal. Ensure that the input voltage is 5 VDC. Next, read the DC voltage This compressor operates with a 3- -phase variable frequency PWM across the ground and output terminal. Record the output voltage. variable voltage to the three fusite terminals. -
Page 12: Fault Code Table
Table 4—Fault Codes 24VNA0 and 25VNA0 with software V9 and later... -
Page 13: Status Codes
Table 5—Fault Codes 25VNA0 With Software V8 and Earlier Status Codes Most system problems can be diagnosed by reading the status code The short flash is 0.25 seconds ON and the long flash is 1.0 second as flashed by the amber status light on the control board. ON. - Page 30 Measure Start resistance Thermistor between black & circuit is white wires in the shorted 4-pin plug Verify scroll temp fault condition at the system Resistance WARNING! controller is in the Recover system Is resistance range that refrigerant 265Ω to 337KΩ? will allow charge operation...
- Page 31 WARNING! Reset scroll temp Disconnect & fault at system lock -out power controller & and recover remove power to system charge drive to reboot Remove the molded plug from the thermistor Put system back fusite on the into operation compressor (See Fig.
- Page 32 Measure Start Disconnect 4-pin resistance Thermistor plug from drive between red & circuit is (See Fig. 18) white wires in the shorted 4-pin plug Verify motor temp fault condition at the Measure Resistance WARNING ! resistance system controller between unit is in range Recover system Is resistance...
- Page 33 WARNING! Confirm Disconnect & Reset motor operation inside lock -out power temp fault at compressor/unit and recover system controller temperature & system charge speed range WARNING! Remove the Disconnect & molded plug from lock-out power, the thermistor allow 2 minutes Is input current to fusite on the for drive to...
- Page 34 Scroll Thermistor Resistance Low Temp Trip 307200 153600 76800 38400 19200 9600 4800 2400 1200 High Temp Trip Temperature (°F) A12038 Fig. 17 – Scroll Thermistor Resistance Motor Thermistor Resistance 204800 Low Temp Trip 102400 51200 25600 12800 6400 3200 1600 High Temp Trip Temperature (°F)
- Page 35 Remove This Plug A11556 Fig. 19 – 4- -Pin Scroll & Motor NTC Thermistor Plug A11557 Fig. 20 – Removing NTC Thermistor Plug...
- Page 36 A11559 A11558 Fig. 22 – Measuring Motor NTC Resistance Fig. 21 – Measuring Scroll NTC Resistance A11560 Fig. 23 – Checking NTC Circuit for Grounded Condition...
- Page 37 Yellow Black Red Ground Output Terminals To Compressor (male spades ) A11561 Fig. 24 – High Voltage Input- -Output Connections on Drive Table 8—Thermistor Resistance Values Scroll Thermistors Motor Thermistors ˚ ˚ ˚ ˚ Ω Value Temp Temp Ω Value Temp Temp 412314...
- Page 38 (See Fig. 26) (See Fig. 25) A11562 Fig. 25 – Variable Speed Drive Troubleshooting...
- Page 39 Measure voltage between L1 & L2 Voltage should be 187 to 253 VAC A11563 Fig. 26 – Measuring Input Voltage (VAC) to Drive L1 & L2...
- Page 40 COMs LEDs are behind gray panel LEDs can be seen by looking behind panel (DO NOT ATEMPT TO REMOVE PANEL) A11564 Fig. 27 – Location of COMs LEDs on Drive...
- Page 41 RS485 6-Pin COMs Plug (to outdoor board) A11565 Fig. 28 – Location of RS485 6- -Pin COMs Plug...
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Page 42: Refrigeration System
REFRIGERATION SYSTEM Refrigerant Servicing Systems on Roofs With Synthetic Materials WARNING POE (polyol ester) compressor lubricants are known to cause long term damage to some synthetic roofing materials. Exposure, even if UNIT OPERATION AND SAFETY HAZARD immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more. -
Page 43: Service Valves And Pumpdown
Service Valves and Pumpdown 1. Connect gages to 24Vvna0 liquid and vapor service ports to monitor operating pressures during and at completion of the WARNING procedure. 2. In the advanced menu of the UI, go to Checkout > Cooling > Pumpdown PERSONAL INJURY AND UNIT DAMAGE HAZARD 3. -
Page 44: Reversing Valve (25Vna0)
25VNA0 Pumpdown & Evacuation service port is a direct connection to the suction port of the compressor. If this system requires either a Pump Down or Evacuation for any reason, the procedures below must be followed: 2. In the advanced menu of the wall control, go to Checkout > Heat Pump>... -
Page 45: Liquid Line Filter Drier
should cut in such a way that stubs can be easily re- -brazed FROM TO INDOOR COIL ACCUMULATOR back into system. Do not use hacksaw. This introduces OUTDOOR VIA SERVICE VALVE COIL ON OUTDOOR COIL chips into system that cause failure. After defective valve is removed, wrap it in wet rag and carefully unbraze stubs. -
Page 46: Suction Line Filter Drier
Thermostatic Expansion Valve (TXV) CAUTION All fan coils and furnace coils will have a factory installed thermostatic expansion valve (TXV). The TXV will be a bi- -flow, UNIT DAMAGE HAZARD hard- -shutoff with an external equalizer and a balance port pin. A Failure to follow this caution may result in equipment damage hard shut- -off TXV does not have a bleed port. - Page 47 8. Install factory authorized accumulator into system with CAUTION copper slip couplings. 9. Evacuate and charge system. PERSONAL INJURY HAZARD Pour and measure oil quantity (if any) from old accumulator. If more than 20 percent of oil charge is trapped in accumulator, add Failure to follow this caution may result in personal injury.
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Page 48: Refrigeration System Repair
A95423 Fig. 37 – Bubble Leak Detection Catalog No.24VNA0---25VNA0---1SM Copyright 2018 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 01/18 Replaces: 25VNA--- 2SM Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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