Carrier 24ANB7, 24ANB1- User Manual

5 ACCESSORY DESCRIPTIONS Refer to Table 1 for an Accessory Usage Guide for AirConditioners and Table 2 for Heat Pumps. Refer to the appropriate section below for a description of each accessory and its use. 1. Crankcase Heater An electric resistance heater which mounts to the base of thecompressor t...

7 LONG LINE GUIDELINE Refer to Residential Piping and Long Line Guideline for air conditioner and heat pump systems using Puron refrigerant orLong Line Guideline for R--22 Air Conditioners and Heat Pumps. CABINET ASSEMBLY Basic Cabinet Designs Certain maintenance routines and repairs require removal...

8 Access Compressor Or Other Internal Cabinet Components NOTE : It is not necessary to remove the top cover to gain access. Removing the top cover may cause grill panels, corner posts,louvers or coils to be damaged. It is recommended to protect thetop cover from damage of tools, belt buckles, etc. w...

9 Base and Comfort Series AC Control Box Base and Comfort HP Control Box Fig. 4 – Base and Comfort Series Control Box Identification

10 Labeling Wiring Label Rating Plate Charging Label Caution Label (3-phase only) Warning Label Piston Label Mid --- Tier / Deluxe Wiring Label Rating Plate Charging Label Caution Label Piston Label Warning Label Entry Fig. 5 – Label Locations

11 ELECTRICAL ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death.Exercise extreme caution when working on any electrical components. Shut off all power to system prior to troubleshooting. Some troubleshooting techniques require power to remain on. In thes...

13 Pressure Switches Pressure switches are protective devices wired into control circuit(low voltage). They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit. Puron pressure switches are specifically designed to operate with Puron r systems. R--22 press...

14 Defrost Thermostat Defrost thermostat signals heat pump that conditions are right fordefrost or that conditions have changed to terminate defrost. It is a thermally actuated switch clamped to outdoor coil to sense its temperature. Normal temperature range is closed at 30 _ ± 3 _ F and open at 65 ...

16 14. Remove jumper between DFT and R terminals. Reconnect defrost thermostat leads. Failure to remove jumper causes unit to switch to defrost every 30, 60, or 90 minutes andremain in defrost for full 10 minutes. 15. Replace control box cover. Restore power to unit. If defrost thermostat does not c...

17 If the defrost thermostat is closed, a complete defrost cycle isinitiated. If the Quiet Shift switch is turned on, the compressor will be turned off for two 30 second intervals as explained previously. Troubleshooting (HK32EA003) If outdoor unit will not run: 1. Does the Y input have 24 volts fro...

18 COPELAND SCROLL COMPRESSOR Scroll Gas Flow Compression in the scroll iscreated by the interaction ofan orbiting spiral and a stationary spiral. Gas entersan outer opening as one of thespirals orbits. The open passage is sealed offas gas is drawn into the spiral. By the time the gas arrives atthe ...

20 COMPRESSOR TROUBLESHOOTING Compressor Failures Compressor failures are classified in 2 broad failure categories;mechanical and electrical. Both types are discussed below. Mechanical Failures A compressor is a mechanical pump driven by an electric motorcontained in a welded or hermetic shell. In a...

21 9. If a compressor hums but won’t start it could indicate either a voltage or amperage issue. Verify adequate voltage and operational start components if installed. If it is drawingexcessive amperage and voltage doesn’t appear to be theproblem it may be assumed a locked condition. Ensure refriger...

22 Electrical Failures The compressor mechanical pump is driven by an electric motorwithin its hermetic shell. In electrical failures, compressor does not run although external electrical and mechanical systems appear normal. Compressor must be checked electrically for abnormalities.Before troublesh...

23 REFRIGERATION SYSTEM Refrigerant UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could result in personal injury or equipment damage.Puron r refrigerant which has higher pressures than R--22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses,...

24 Before brazing the line set to the valves, the belled ends of thesweat connections on the service valves must be cleaned so that no brass plating remains on either the inside or outside of the belljoint. To prevent damage to the valve and/or cap “O” ring, use a wet cloth or other acceptable heat-...

26 Reversing Valve In heat pumps, changeover between heating and cooling modes is accomplished with a valve that reverses flow of refrigerant insystem. This reversing valve device is easy to troubleshoot and replace. The reversing valve solenoid can be checked with poweroff with an ohmmeter. Check f...

27 Liquid Line Filter Drier Filter driers are specifically designed for R--22 or Puron r refrigerant. Only operate with the appropriate drier using factory authorized components.It is recommended that the liquid line drier be installed at theindoor unit. Placing the drier near the TXV allows additio...

28 Accumulator The accumulator is specifically designed to operate with Puron r or R22 respectfully; use only factory--authorized components. Under some light load conditions on indoor coils, liquid refrigerant is present in suction gas returning to compressor. The accumulatorstores liquid and allow...

30 Replacing TXV on an Indoor Coil (pre--2006) 1. Pump system down to 2 psig and recover refrigerant.2. Remove coil access panel and fitting panel from front of cabinet. 3. Remove TXV support clamp using a 5/16--in. nut driver. Save the clamp. 4. Remove R--22 TXV using a backup wrench on flare conne...

31 REFRIGERATION SYSTEM REPAIR Leak Detection New installations should be checked for leaks prior to complete charging. If a system has lost all or most of its charge, system must be pressurized again to approximately 150 psi minimum and 375psi maximum. This can be done by adding refrigerant using n...

32 Compressor Removal and Replacement Once it is determined that compressor has failed and the reasonestablished, compressor must be replaced. PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury.Turn off all power to unit before proceeding. Wear safety glasses, protec...

33 Evacuation Proper evacuation of the system will remove non--condensiblesand assure a tight, dry system before charging. The two methods used to evacuate a system are the deep vacuum method and the triple evacuation method. Deep Vacuum Method The deep vacuum method requires a vacuum pump capable o...

34 TROUBLESHOOTING WITH SUPERHEAT This troubleshooting routine was developed to diagnose coolingproblems using superheat in TXV systems. It is effective on heat pumps in cooling mode as well as air conditioners. The systemmust utilize a TXV as the expansion device in cooling mode. Basic DiagnosticsN...

35 High Superheat with Normal or High Suction PressureNOTE : Normal to High suction pressure is considered for R--22: > ∼ 65 psig, Puron: > ∼ 110 psig. An application issue or other system component failure typically causes this condition. 15. Check airflow, sensing bulb tightness, orientation...

36 Table 5—Puron System Suction Pressure Drop Nominal Size (Btuh) Suction Line OD (in.) Pressure Drop (psi/100 ft) Suction Velocity fpm Puron Suction Line Pressure Drop (psig) Total Equivalent Line Length (ft) 20 50 80 100 125 150 175 200 225 250 18000 18000 18000 1/2 9.9 1649 2 5 8 10 12 15 17 20 2...

37 Table 6—R--22 System Suction Pressure Drop Nominal Size (Btuh) Line OD (in.) Pressure Drop (psi/100 ft) Suction Velocity Fpm R --- 22 Suction Line Pressure Drop (psig) Total Equivalent Line Length (ft) 20 50 80 100 125 150 175 200 225 250 18000 18000 18000 18000 5/8 13.6 2563 3 7 11 14 17 20 24 2...

39 Table 8—R--22 Refrigerant Pressure Temperature Relationship psig ° F psig ° F psig ° F psig ° F psig ° F psig ° F psig ° F 7 --25.9 71 41.7 135 76.2 199 101.1 263 120.9 327 137.5 391 152.0 8 --24.0 72 42.3 136 76.7 200 101.4 264 121.1 328 137.8 392 152.2 9 --22.1 73 43.0 137 77.1 201 101.7 265 12...

40 Table 9—Puron Subcooling Chart 2 4 6 8 10 12 14 16 18 20 200 70 68 66 64 62 60 58 56 54 52 50 210 73 71 69 67 65 63 61 59 57 55 53 220 76 74 72 70 68 66 64 62 60 58 56 230 79 77 75 73 71 69 67 65 63 61 59 240 82 80 78 76 74 72 70 68 66 64 62 250 84 82 80 78 76 74 72 70 68 66 64 260 87 85 83 81 79...

44 TWO--STAGE 25HNB/24ANB Application Guidelines Carrier designed and tested the two--stage air conditioner and heatpump products with Puron refrigerant to operate at a minimum outdoor operating ambient in cooling mode at 55 _ F without low ambient cooling enabled and the maximum outdoor operatingam...

45 Airflow Selections for 24ANB7 / 25HNB6 / 24ANB1 /25HNB9 Using Non--Communicating (Non--Infinity) Thermostats Airflow Selection for 58CVA/58MVB Furnaces The 58CVA/58MVB variable--speed furnaces provide high--and low--stage blower operation to match the capacities of thecompressor at high and low s...

46 S The ODF fan delay defeat can be toggled by shorting the forced defrost pins for >15 seconds while in the standby mode (status LED on solid). The LED will start to flash when the toggle has taken place. S Status code 4 shows the fan delay defeat is active (no delay) S Status code 3 shows that...

48 The outdoor Integral Control Motor (ECM), is a variable--speedmotor which operates from 450 to 850 rpm. The motor is a dc permanent magnet--type motor with the electronic controlsintegrated into its rear cover. The control package includes a small diode bridge, capacitors, and power switching dev...

49 Muffler, Accumulator, Reversing Valve (RVS) The Puron r two--stage air conditioners and heat pumps have a compressor discharge line muffler, to dampen sound pressure pulsations.The Puron r two--stage heat pumps have a specifically designed reversing valve, for Puron r application and an accumulat...

50 UTILITY RELAY * UTILITY SIGNAL OPEN RELAY * SUPPLIED BY UTILITY PROVIDER A B C A B C A12260 LLS Liquid Line Solenoid A B C A B C A12261 Fig. 33 – 2--Stage Control Board TROUBLESHOOTING Troubleshooting circuit board HK38EA016, 022, 023 The Infinity Series outdoor units all use the same control boa...

53 Table 15—Two--Stage Compressor Resistances (Winding Resistance at 70 _ F ±20 _ ) Winding 024 036 048 060 Start (S-- C) 1.64 1.52 1.86 1.63 Run (R-- C) 1.30 0.88 0.52 0.39 Status Codes Table 16 shows the status codes flashed by the amber status light.Most system problems can be diagnosed by readin...

55 TWO STAGE NON--COMMUNICATING 24ACB7/25HCB6 These units are a low cost 2--stage option that isnon--communicating utilizing 2 stage scroll technology. These units require Performance Boost furnace (58PH, 58MEB), variablespeed furnace (58MV, 58CV) or new model variable speed fan coil (FV4C). Variabl...

56 SYSTEM FUNCTION AND SEQUENCEOF OPERATION (24ACB7/25HCB6) NOTE : Defrost control board is equipped with 5 minute lockout timer that is initiated upon any interruption of power.Turn on power to indoor and outdoor units. Transformer is energized.These models utilize a 2--stage indoor thermostat. Wit...

57 OF2 O F1 ON QUIET SHIFT 120 30 60 60 30 90 INTER V AL TIMER OFF P3 DFT O R W 2 Y C T2 C C O DFT T1 Y P1 J1 SPEEDUP SpeedupPins Defrost intervalDIP switches QuietShift A05378 Fig. 41 – Defrost Control CHECK CHARGE Factory charge amount and desired subcooling are shown on unitrating plate. Charging...

58 CARE AND MAINTENANCE To assure high performance and minimize possible equipment malfunction, it is essential that maintenance be performedperiodically on this equipment. The frequency with which maintenance is performed is dependent on such factors as hours of operation, geographic location, and ...

59 Electrical Controls and Wiring 1. Disconnect power to both outdoor and indoor units.2. Check all electrical connections for tightness. Tighten all screws on electrical connections. If any connections appear to be burned or smoky, disassemble the connection, clean all parts and stripped wires, and...

63 INDEX OF TABLES DESCRIPTION TABLE # Required Field--Installed Accessories for Air Conditioners 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required Field--Installed Accessories for Heat Pumps 2 . . . . . . . . . ....