Carrier 25VNA Service Manual
Infinity variable speed heat pump with greenspeedt intelligence 2 to 5 nominal tons
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Also See for 25VNA:
- Product data (38 pages) ,
- Installation instructions manual (18 pages) ,
- Owner's manual (4 pages)
Table of Contents
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25VNA
Infinityt Variable Speed Heat Pump
with Greenspeedt Intelligence
2 to 5 Nominal Tons
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Service Manual
TABLE OF CONTENTS
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Table of Contents
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Summary of Contents for Carrier 25VNA
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Page 1: Table Of Contents
25VNA Infinityt Variable Speed Heat Pump with Greenspeedt Intelligence 2 to 5 Nominal Tons Service Manual TABLE OF CONTENTS PAGE UNIT IDENTIFICATION ................. . -
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 Heat Pump SEER Undefined (20 SEER) -
Page 3: Safety Considerations
GENERAL INFORMATION WARNING The 25VNA Greenspeed Intelligence heat pump features a new outdoor cabinet design that uses a four sided coil design to minimize the unit foot print and provide the best heat exchange ELECTRICAL HAZARD - - HIGH VOLTAGE! taking full advantage of the latest variable speed technology. -
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: Electronic Expansion Valve (Exv)
Electronic Expansion Valve Motor Control Drive (Inverter): Converts the sinusoidal AC input mains voltage into a variable frequency AC output generated used PWM modulation of the output. Drive adjusts the output voltage to run the compressor at the correct speed at any load point in the envelope. The drive actively controls the motor current to insure the proper torque is provided for the given loading condition. -
Page 6: Infinity Controlled Low Ambient Cooling
Infinity Controlled Low Ambient Cooling This unit is capable of low ambient cooling down to 0°F (- -17.8°C) SEC1 SEC2 with Low Ambient enabled on the Infinity Control. A low ambient kit is not required. The only accessory that may be PWM2 PWM1 required is wind baffles in locations which are likely to experience... -
Page 7: Connection Diagram
Temperature Is Above 50ºF, Defrost Mode Will Terminate After 30 Seconds Of Active Mode. ELECTRONIC EXPANSION VALVE Fig. 4 – Wiring Diagram — 25VNA Model sizes 2 - - 5 tons, 208/230- -1 User Interface (UI) Furnace or Fan Coil... -
Page 8: Refrigerant Piping Length Limitations
REFRIGERANT PIPING LENGTH LIMITATIONS Maximum Line Lengths: The maximum allowable total equivalent length for heat pumps varies depending on the vertical separation. See the tables below for allowable lengths depending on whether the outdoor unit is on the same level, above or below the outdoor unit. MAXIMUM LINE LENGTHS FOR HEAT PUMP APPLICATIONS MAXIMUM ACTUAL LENGTH MAXIMUM EQUIVALENT LENGTH{... - Page 9 External Muffler Factory Supplied Muffler (part # LM10KK003) Installation is EXTERIOR Required On Every Installation: WALL A muffler is required to reduce noise transmitted to indoor through the line set. Muffler must be installed outside the dwelling. Muffler can also be installed in vertical configuration for space consideration maintaining a minimum of 12 in (304.8 mm) straight pipe section to the closest bend.
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Page 10: Troubleshooting
TROUBLESHOOTING Control Fault If the outdoor unit control board has failed, the control will flash Systems Communication Failure the appropriate fault code. The control board should be replaced. If communication with the Infinity control is lost with the User If the sensors are out of range, the control will flash the appropriate Interface (UI), the control will flash the appropriate fault code (see fault code. - Page 11 Cool: PSUCT < 55 psig (for 3 minutes) Heat: PSUCT < 23 psig (for 3 minutes) PSUCT < 13 psig (instantaneous) PRESSURE TRANSDUCER (SPT) ACCUMULATOR TUBE CAUTION SUCTION TUBE COMPRESSOR SUCTION THERMISTOR (OST) UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment ACCUMULATOR damage or improper operation.
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Page 12: Fault Codes
Table 5—Fault Codes FAULT DESCRIPTION SENT TO UI FLASH CODE (AMBER LED) RESET TIME (minutes) --- --- Standby ON, no flash Variable Capacity or Emergency --- --- 1, pause Mode 1 (2 sec ON), longer pause --- --- Variable Speed Range Cutback second OFF) Communications Loss Invalid Model... -
Page 13: 25Vna Event / Fault
Table 6—25VNA EVENT / FAULT FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Standby/Charging ON, no flash --- --- --- --- --- --- --- --- --- Variable Capacity 1, pause --- --- --- --- --- ---... - Page 14 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Verify contactor harness from ODU con- trol (”CC” harness); check for loose con- nection, stripped wires, short to ground Contactor dropping out momentar- or short between wires;...
- Page 15 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Event Both Outdoor Air Thermistor Issue See Error 53 and\or Error 56 Outside Normal Operating Range (e.g. improper load calculation, sys- Consult Application Guidelines...
- Page 16 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode System will try to ride through current spikes and self ---recover in trip condition; Event Cool High Suction Gas Temperature persistent over current trips will lead to Error 82 ”Suction Over Temp Lockout”...
- Page 17 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Cooling in Low Ambient region (55 Enable ”Low Ambient Cooling” via user Cool ° F and below) with ”Low Ambient interface Cooling Control” disabled Outside Normal Operating Range (e.g.
- Page 18 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Outside Normal Operating Range (e.g. improper load calculation, sys- Consult Application Guidelines tem match issue, outside cooling range, outside heating range etc) loose High Pressure Switch harness...
- Page 19 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode System will try to ride through current Multiple Error 59 --- ”Compressor spikes and self ---recover in trip condition; Scroll Temp Out of Range” within two persistent Error 59 --- ”Compressor Scroll...
- Page 20 25VNA EVENT / FAULT (CONT.) FLASH CODE Heat or Cool OPERATION Possible Causes ACTION (Amber LED) Mode Check supply voltage to ODU; if low con- Low supply line voltage (< 180 VAC) tact utility provider When adverse weather subsides unit Stormy weather causing intermittent should self ---recover;...
- Page 21 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 22 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 23 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 Measure condition at the Resistance WARNING ! resistance system controller between unit is in range Recover system Is resistance...
- Page 24 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 25 Scroll Thermistor Resistance Low Temp Trip 307200 153600 76800 38400 19200 9600 4800 2400 1200 High Temp Trip Temperature (°F) A12038 Fig. 16 – Scroll Thermistor Resistance Motor Thermistor Resistance 204800 Low Temp Trip 102400 51200 25600 12800 6400 3200 1600 High Temp Trip Temperature (°F)
- Page 26 Remove This Plug A11556 Fig. 18 – 4- -Pin Scroll & Motor NTC Thermistor Plug A11557 Fig. 19 – Removing NTC Thermistor Plug...
- Page 27 A11559 A11558 Fig. 21 – Measuring Motor NTC Resistance Fig. 20 – Measuring Scroll NTC Resistance A11560 Fig. 22 – Checking NTC Circuit for Grounded Condition...
- Page 28 Yellow Black Red Ground Output Terminals To Compressor (male spades ) A11561 Fig. 23 – High Voltage Input- -Output Connections on Drive Table 7—Thermistor Resistance Values Scroll Thermistors Motor Thermistors ˚ ˚ ˚ ˚ Ω Value Temp Temp Ω Value Temp Temp 412314...
- Page 29 (See Fig. 26) (See Fig. 25) A11562 Fig. 24 – Variable Speed Drive Troubleshooting...
- Page 30 Measure voltage between L1 & L2 Voltage should be 187 to 253 VAC A11563 Fig. 25 – Measuring Input Voltage (VAC) to Drive L1 & L2...
- Page 31 COMs LEDs are behind gray panel LEDs can be seen by looking behind panel (DO NOT ATEMPT TO REMOVE PANEL) A11564 Fig. 26 – Location of COMs LEDs on Drive...
- Page 32 RS485 6-Pin COMs Plug (to outdoor board) A11565 Fig. 27 – Location of RS485 6- -Pin COMs Plug...
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Page 33: 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 34: Service Valves And Pumpdown
Service Valves and Pumpdown 1. Connect gages to 25VNA liquid and vapor or suction capil- lary service ports to monitor operating pressures during and WARNING at completion of the procedure. 2. In the advanced menu of the UI, go to Checkout > Heat Pump>... - Page 35 6. Remove power from indoor and heat pump unit prior to ser- 4. Use slip couplings to install new valve with stubs back into vicing unit. The EXV will retain the open position. system. Even if stubs are long, wrap valve with a wet rag to prevent overheating.
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Page 36: Liquid Line Filter Drier
Liquid Line Filter Drier Thermostatic Expansion Valve (TXV) Filter driers are specifically designed for R- -22 or Puronr All fan coils and furnace coils will have a factory installed refrigerant. Only operate with the appropriate drier using factory thermostatic expansion valve (TXV). The TXV will be a bi- -flow, authorized components. -
Page 37: Accumulator
Accumulator CAUTION The accumulator is specifically designed to operate with Puronr or R22 respectfully; use only factory- -authorized components. PERSONAL INJURY HAZARD Under some light load conditions on indoor coils, liquid refrigerant is present in suction gas returning to compressor. The accumulator Failure to follow this caution may result in personal injury. -
Page 38: Refrigeration System Repair
SOLUTION A95423 Fig. 34 – Bubble Leak Detection Catalog No.25VNA ---1SM Copyright 2012 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/12 Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.