Carrier WeatherExpert 48LC 14 Series Service And Maintenance Instructions
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Carrier WeatherExpert 48LC 14 Series Service And Maintenance Instructions

Carrier WeatherExpert 48LC 14 Series Service And Maintenance Instructions

Single package rooftop unit with gas heat/electric cooling with puron (r-410a) refrigerant
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Single Package Rooftop Unit with Gas Heat/Electric Cooling
Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
UNIT ARRANGEMENT AND ACCESS. . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Seasonal Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 3
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . . 3
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Troubleshooting Cooling System. . . . . . . . . . . . . . . . 6
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . . 8
Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . . 9
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . 14
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . 14
Wet in Use Convenience Outlet Cover. . . . . . . . . . . 15
Non-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Unit-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fuse On Powered Type . . . . . . . . . . . . . . . . . . . . . . . 16
SMOKE DETECTORS. . . . . . . . . . . . . . . . . . . . . . . . . 16
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 17
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . 18
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 21
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . 21
Control Circuit, 24-v. . . . . . . . . . . . . . . . . . . . . . . . . . 22
GAS HEATING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 22
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fuel Types and Pressures. . . . . . . . . . . . . . . . . . . . . 22
Flue Gas Passageways . . . . . . . . . . . . . . . . . . . . . . . 23
Combustion-Air Blower . . . . . . . . . . . . . . . . . . . . . . . 23
Burners and Ignitors . . . . . . . . . . . . . . . . . . . . . . . . . 23
Burner Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Orifice Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 26
Troubleshooting Heating System . . . . . . . . . . . . . . . 30
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480153-01
Printed in U.S.A.
Form 48LC-14-26-03SM
WeatherExpert
with Puron
®
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .32
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . . 33
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .33
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Refrigerant Service Ports. . . . . . . . . . . . . . . . . . . . . .33
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . 33
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Ventilation (Continuous Fan). . . . . . . . . . . . . . . . . . . 33
RTU Open Control System. . . . . . . . . . . . . . . . . . . . .34
SystemVu™ (Factory Option) . . . . . . . . . . . . . . . . . .34
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . . 37
Staged Air Volume (SAV™) with Variable Frequency
Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
FASTENER TORQUE VALUES. . . . . . . . . . . . . . . . . .63
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . .63
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Economizer (Optional) . . . . . . . . . . . . . . . . . . . . . . . .64
(4°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .66
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .67
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . .70
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . .81
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards Institute) Z223.1. Wear safety glasses and work gloves.
Pg 1
48LC**14-26
®
(R-410A) Refrigerant
2-2020
Replaces: 48LC-14-26-02SM

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Summary of Contents for Carrier WeatherExpert 48LC 14 Series

  • Page 1: Table Of Contents

    WeatherExpert 48LC**14-26 ® Single Package Rooftop Unit with Gas Heat/Electric Cooling with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions CONTENTS START-UP, GENERAL ......32 Unit Preparation .

  • Page 2: Unit Arrangement And Access

    Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations. WARNING It is important to recognize safety information. This is the safety- alert symbol . When you see this symbol on the unit and in ELECTRICAL OPERATION HAZARD instructions or manuals, be alert to the potential for personal Failure to follow this warning could result in personal injury or injury.

  • Page 3: Routine Maintenance

    of these filters and screens will need to be periodically replaced or cleaned. RETURN AIR FILTERS Return air filters are disposable fiberglass media type. Access to the filters is through the vertical panel to the right of the control box. Filters are situated on slide out racks for easy inspection and repair.
  • Page 4 is on the motor. The pulleys are connected using a “V” type belt. To replace the belt: (See Fig. 4.) Use a belt with same section type or similar size. Do not sub- stitute a “FHP” type belt. When installing the new belt, do not use a tool (screwdriver or pry-bar) to force the belt over the pulley flanges, as this will stress the belt and cause a reduc- tion in belt life.

  • Page 5: Cooling

    ment). This will reduce the amount of vibration generated by the motor/belt-drive system. To determine variable pitch pulley diameter, perform the follow- FAN PULLEY ing calculation: MOVABLE FLANGE Determine full open and full closed pulley diameter. Subtract the full open diameter from the full closed diameter. STRAIGHT EDGE MUST BE PARALLEL Divide that number by the number of pulley turns open from...

  • Page 6: Refrigerant System Pressure Access Ports

    This cleaner is avail- Remove all surface loaded fibers and dirt with a vacuum able from Carrier Replacement parts division as part number cleaner as described above. P902-0301 for one gallon container, and part number P902-0305 Thoroughly wet finned surfaces with clean water and a low for a 5 gallon container.
  • Page 7 SEAT CORE (Part No. EC39EZ067) 1/2-20 UNF RH 0.596 45° 30° WASHER DEPRESSOR PER AHRI 720 O-RING 1/2” HEX +.01/-.035 5/8” HEX 0.47 FROM FACE OF BODY This surface provides a metal to metal seal when 7/16-20 UNF RH torqued into the seat. Appropriate handling is required to not scratch or dent the surface.

  • Page 8: Puron® (R-410A) Refrigerant

    Amount of refrigerant charge is listed on the unit’s nameplate. Re- perature is low, carefully recover some of the charge. Recheck the fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec- discharge pressure as charge is adjusted. lamation training manual and the following procedures.

  • Page 9: Cooling Charging Charts

    COOLING CHARGING CHARTS 12.5 Ton R-410A CHARGING CHART For Standard Units: Must run both compressors and OFM at high speed For Humidi-MiZer Units: Must run Sub-Cooling Mode Standard Unit with Humidi-MiZer Add charge if above curve Standard Unit Remove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 50LC500756...
  • Page 10 15 Ton R-410A CHARGING CHART For Standard Units: Must run both compressors and OFM at high speed For Humidi-MiZer Units: Must run Sub-Cooling Mode Add charge if above curve Standard Unit with Humidi-MiZer Standard Unit Remove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 50LC500757...
  • Page 11 17.5 Ton R-410A CHARGING CHART For Standard Units: Must run both compressors and OFM at high speed For Humidi-MiZer Units: Must run Sub-Cooling Mode Add charge if above curve Standard Unit w/ Humidi-MiZer ® Standard Unit Remove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 50LC500758...
  • Page 12 20 Ton R-410A CHARGING CHART For Standard Units: Must run both compressors and OFM at high speed For Humidi-MiZer Units: Must run Sub-Cooling Mode Add charge if above the curve Standard Unit with Humidi-MiZer Standard Unit Remove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 50LC500759...
  • Page 13 22.5 Ton R-410A CHARGING CHART For Standard Units: Must run both compressors and OFM at high speed For Humidi-MiZer Units: Must run Sub-Cooling Mode Add charge if above the curve Standard Unit w/ Humidi-MiZer Standard Unit Remove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 50LC500760...

  • Page 14: Compressors

    COMPRESSOR ROTATION Compressors On 3-phase units with scroll compressors, it is important to be cer- LUBRICATION tain compressor is rotating in the proper direction. To determine Compressors are charged with the correct amount of oil at the whether or not compressor is rotating in the proper direction: factory.

  • Page 15: Wet In Use Convenience Outlet Cover

    Two types of convenience outlets are offered on 48LC models: The primary leads to the convenience outlet transformer are not non-powered and unit-powered. Both types provide a 125-volt factory-connected. Selection of primary power source is a custom- GFCI (ground-fault circuit-interrupter) duplex receptacle rated at er option.

  • Page 16: Maintenance

    Maintenance Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle. This should cause the internal circuit of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required.

  • Page 17: Smoke Detector Locations

    RETURN AIR WITHOUT ECONOMIZER The sampling tube is located across the return air opening on the unit basepan. (See Fig. 21.) The holes in the sampling tube face downward, into the return air stream. The sampling tube is con- nected via tubing to the return air sensor that is mounted on a bracket high on the partition between return filter and controller location.

  • Page 18: Sensor And Controller Tests

    Step 1 Step 2 Step 3 Fig. 22 — Completing Installation of Return-Air Smoke Sensor Fig. 23 — Typical Smoke Detector System Wiring Reset the sensor by holding the test magnet against the sensor Sensor and Controller Tests housing for two seconds. SENSOR ALARM TEST Verify that the sensor’s Alarm LED turns off.
  • Page 19 Reset the sensor by pressing the test/reset switch for two To Configure the Dirty Sensor Test Operation seconds. Hold the test magnet where indicated on the side of the sensor housing until the sensor’s Alarm LED turns on and its Dirty Verify that the controller’s Alarm LED turns off.

  • Page 20: Detector Cleaning

    Indicators IMPORTANT: Failure to follow this notice may result in per- NORMAL STATE sonnel and authority concern. The smoke detector operates in the normal state in the absence of If the test/reset station’s key switch is left in the RESET/TEST any trouble conditions and when its sensing chamber is free of position for longer than seven seconds, the detector will auto- smoke.

  • Page 21: Troubleshooting

    Table 3 — Detector Indicators CONTROL OR INDICATOR DESCRIPTION Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in the Magnetic test/reset switch normal state. Alarm LED Indicates the sensor is in the alarm state. Trouble LED Indicates the sensor is in the trouble state.

  • Page 22: Control Circuit, 24-V

    Table 4 — Overcurrent Device Type MOTOR SIZE (bhp) OVERLOAD DEVICE RESET Internal Linebreak Automatic Internal Linebreak Automatic Thermik Automatic Thermik Automatic External Manual (Circuit Breaker) CONDENSER FAN MOTOR PROTECTION LIMIT The condenser fan motor is internally protected against SWITCH FOR overtemperature.

  • Page 23: Flue Gas Passageways

    Combustion-Air Blower Table 8 — Liquid Propane Manifold Pressure Ranges Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE season. For the first heating season, inspect blower wheel bi- 10.0 in.
  • Page 24 CLEANING AND ADJUSTMENT ORIFICE Remove burner rack from unit as described in Removal and Replacement of Gas Train section, above. Inspect burners; if dirty, remove burners from rack. (Mark 1.00-in each burner to identify its position before removing from the (25.4 mm) rack.) Use a soft brush to clean burners and cross-over port as...
  • Page 25 Fig. 36 — Spark Adjustment GAS VALVE To adjust gas valve pressure settings: All unit sizes are equipped with 2-stage gas valves. See Fig. 37 for locations of adjustment screws and features on the gas valves. IMPORTANT: Leak check (using a mixture of soapy water or leak detection fluid) all gas connections including the main service connection, gas valve, gas spuds, and manifold SINGLE STAGE AND TWO STAGE...

  • Page 26: Burner Ignition

    When replacing unit orifices, order the neces- the flames are approximately the same for each burner. sary parts via Carrier RCD. See Table 10 for available orifice siz- 12. Turn off unit, close manual gas shut off valve, remove pres- es.
  • Page 27 RED LED - STATUS Fig. 38 — Integrated Gas Control (IGC) Board...
  • Page 28 Fig. 39 — Typical IGC Wiring Diagram Table 11 — IGC Connections CONNECTION TERMINAL LABEL POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O PIN NUMBER INPUTS RT, C Input power from TRAN 1 control box 24 VAC — Speed sensor gas section analog input J1, 1-3 FS, T1...
  • Page 29 Table 12 — Altitude Compensation* NATURAL GAS NOMINAL HEAT INPUT ELEVATION 220K BTUH 310K BTUH 400K BTUH Orifice Input Orifice Input Orifice Input Feet Meters Size (btu/hr) Size (btu/hr) Size (btu/hr) 0-610 220,000 310,000 400,000 0-2000 202,400 285,200 368,000 2000 193,600 272,800 352,000...

  • Page 30: Minimum Heating Entering Air Temperature

    Minimum Heating Entering Air Temperature Thermostat When operating on first stage heating, the minimum temperature of air entering the dimpled heat exchanger is 50°F (10°C) continu- ous and 45°F (7°C) intermittent for standard heat exchangers and 40°F (4°C) continuous and 35°F (2°C) intermittent for stainless OALT steel heat exchangers.
  • Page 31 Table 14 — IGC Board LED Alarm Codes ACTION TAKEN FLASH DESCRIPTION RESET METHOD PROBABLE CAUSE BY CONTROL CODE Normal Operation — — — Loss of power to the IGC. Check 5 amp fuse on Hardware Failure No gas heating. —...

  • Page 32: Pre-Start-Up

    PRE-START-UP WARNING WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD PERSONAL INJURY HAZARD Failure to follow this warning could cause personal injury or Failure to follow this warning could result in personal injury or death. death. Relieve pressure and recover all refrigerant before system re- Follow recognized safety practices and wear approved pair or final unit disposal.

  • Page 33: Outdoor-Air Inlet Screens

    THERMOSTAT Main Burners Install a Carrier-approved accessory 3-stage thermostat according Main burners are factory set and should require no adjustment. to installation instructions included with the accessory. If a 3-stage To check ignition of main burners and heating controls, move...

  • Page 34: Rtu Open Control System

    For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gage) insulated wire (35°C [95°F] minimum). For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire (35°C [95°F] minimum). RUBBER For over 75 ft (23 m), use no.

  • Page 35: Integrated Staging Control (Isc) Board

    Integrated Staging Control (ISC) Board Indoor Fan Power Phase Phase Auxilary Condensate Economizer “On” Status Board Plug Monitor Monitor Shutdown Overflow Relay Relay Remote Shutdown Control Smoke Shutdown Smoke Alarm Control Occupancy Low Ambient Outdoor Fan Control Status Code LEDs Compressors Reheat Thermostat...
  • Page 36 The power exhaust fans will be energized and de-energized, if in- General stalled, as the outdoor-air damper opens and closes. The Carrier Integrated Staging Control (ISC) is intended for use If field-installed accessory CO sensors are connected to the econ-...

  • Page 37: Economi$Er® X (Factory Option)

    Table 16 — Low Ambient Temperature Outdoor Fan Control OUTDOOR NO. OF NO. OF 48LC** SWITCH FANS ON FANS OFF SELECT SWITCH SPST SPST SPST SPST SPST HEATING In the Heating Mode (W1 and G on the thermostat), the ISC board sends power to W on the IGC board.
  • Page 38 • Nominal Power Consumption (at 24 vac, 60 Hz) — ECONOMIZER MODULE WIRING DETAILS 11.5 VA without sensors or actuators Use Fig. 47 and Tables 17 and 18 to locate the wiring terminals • Relay Digital Output Rating at 30 vac (maximum power for the Economizer module.
  • Page 39 Table 18 — Economizer Module Table 19 — HH57AC081 Sensor Wiring Terminations (Right Hand Terminal Blocks) TERMINAL TYPE DESCRIPTION LABEL TYPE DESCRIPTION NUMBER LABEL Top Right Terminal Blocks S-BUS Communications AUX2 I 24 vac IN The first terminal is not used. S-BUS S-BUS (Enthalpy Control...
  • Page 40 To use the keypad when working with menus: NOTE: When values are displayed, pressing and holding the ▲ or ▼ button causes the display to automatically increment or • Press the ▲ (Up arrow) button to move to the previous decrement.
  • Page 41 Table 21 — W7220 Menu Structure* PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † FIRST STAGE COOLING DEMAND (Y1–IN) ECON AVAIL YES/NO YES = economizing available; the system can use outside air for free cooling when required FIRST STAGE COOLING RELAY OUTPUT ECONOMIZING YES/NO...
  • Page 42 Table 21 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † EXHAUST STAGE 2 RELAY OUTPUT Output of AUX1 O terminal Displays ON when damper position reaches programmed EXH2 OUT ON/OFF percentage set point.
  • Page 43 Table 21 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † EXHAUST FAN STAGE 1 SETPOINT Set point for OA damper position when exhaust fan 1 is powered 0 to 100%; by the economizer.
  • Page 44 Table 21 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † NONE Used for alarm for when the DA air temperature is too high. Sets 70°F to 180°F DA HI ALM 80°F (27°C) upper range of alarm;...
  • Page 45 Table 21 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † Check if outdoor temperature is below the LOW Temp Lockout on set point menu. Check if Mixed air temperature on STATUS FREEZE ALARM menu is below the Lo Set point on Advanced menu.
  • Page 46 Table 23 — Dry Bulb Operation without DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED VENTILATION (DCV) ECONOMIZE High 0-v/Off 0-v/Off MIN POS Closed High 24-v/On 0-v/Off MIN POS Closed High...
  • Page 47 Table 26 — Enthalpy Operation with DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED VENTILATION (DCV) ECONOMIZE High 0-v/Off 0-v/Off Closed VENTMIN High 24-v/On 0-v/Off Closed VENTMIN High 24-v/On 24-v/On...
  • Page 48 Table 28 — Dry Bulb Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
  • Page 49 Table 30 — Enthalpy Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed 0v/Off...
  • Page 50 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 51 — Single Enthalpy Curve Boundaries Table 32 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 51: Drive

    cycles through the active alarms. You can also navigate to the Alarms menu at any time. Clearing Alarms Once the alarm has been identified and the cause has been re- moved (e.g. replaced faulty sensor) the alarm can be cleared from the display.

  • Page 52: Multi-Speed Vfd Display Kit

    ALPHA NUMERIC DISPLAY The LCD display is backlit with 2 alpha-numeric lines. All data is displayed on the LCD. MENU KEY Use the Menu key to select between Status, Quick Menu or Main Menu. The triangle icon at the bottom of the LCD dis- play indicates the currently selected mode.
  • Page 53 Com. Warn. Alarm Com. LED: Flashes when bus communications is communicating. Green LED/On: Control selection is working. Yellow LED/Warn.: Indicates a warning. Flashing Red LED/Alarm: Indicates an alarm. ▲▼ Arrows : Use the Up and Down arrow keys to navigate between parameter groups, parameters and within parameters.
  • Page 54 Male Connector - connect to VFD Front Panel Select language English [0] English SETUP 1 Status Quick Main Menu Menu Menu Com. Warn. Alarm Hand Auto Reset Fig. 61 — Keypad with Power Up Screen Displayed To program the VFD for 3 discreet indoor fan motor speeds 1.
  • Page 55 3. Clearing Alarm 060: External Interlock: d. Press ▼ (Down Arrow) twice to reach the following a. Press the Menu key twice to position the ▼ (triangle display: icon) over Main Menu; the display changes to: 1—1* Motor Selection 0—** Operation / Display 1—2* Motor Data 1—** Load and Motor e.
  • Page 56 d. Press ▼ (Down Arrow) until the following display 7. Setting References: appears: a. Press the Menu key to move the ▼ (triangle icon) so it is positioned over Main Menu. The display shows the following: 1—6* Load Depen. Setting 1—7* Start Adjustments e.
  • Page 57 8. Setting the Ramp Time: Tables 33-37 for proper selection of the value for this parameter, then press OK to set the selected value. a. Press the Back key until the following display appears: h. Press ▼ (Down Arrow) once, the following display appears: 3—0* Reference Limits 3—1* References...
  • Page 58 d. Press ▼ (Down Arrow) once to move the highlight to e. Press OK, the following display appears: the bottom row and then press OK. The following dis- play appears: 14-20 Reset Mode [0] Manual reset f. Press OK to highlight the number in the bracket. 6-10 Terminal 53 Low Voltage g.
  • Page 59 Motor Current Regional Grid Motor Motor Motor Nominal Frequency (Must-Hold Settings Type Power Voltage Speed (rpm) (Hz) Amps) Motor VFD Carrier VFD Mfr Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Option 208/230V HD58FE654 HK30WA371 131L9796 [102] [10] 1735...
  • Page 60 Motor Current Regional Grid Motor Motor Motor Nominal Frequency (Must-Hold Settings Type Power Voltage Speed (rpm) (Hz) Amps) Motor VFD Carrier VFD Mfr Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Option 208/230V HD58FE654 HK30WA371 131L9796 [102] [10] 1735...
  • Page 61 Motor Current Regional Grid Motor Motor Motor Nominal Frequency (Must-Hold Settings Type Power Voltage Speed (rpm) (Hz) Amps) Motor VFD Carrier VFD Mfr Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Option 208/230V HD60FE656 HK30WA372 131L9797 [102] [11] 11.7...
  • Page 62 Motor Current Regional Grid Motor Motor Motor Nominal Frequency (Must-Hold Settings Type Power Voltage Speed (rpm) (Hz) Amps) Motor VFD Carrier VFD Mfr Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Option 208/230V HD60FK657 HK30WA373 131L9798 [102] [14] 21.2...

  • Page 63: Fastener Torque Values

    FASTENER TORQUE VALUES SEQUENCE OF OPERATION General Table 38 — Torque Values The Carrier Integrated Staging Control Board (ISC) is intended for use with a standard thermostat capable of three cooling stages. Af- LOCATION TORQUE VALUES ter initial power to the board, a Green LED will blink with a Supply fan motor mounting 120 ±...

  • Page 64: Ventilation

    economizer operation, there must be a thermostat call for the fan Ventilation (G). If the unit is occupied and the fan is on, the damper will oper- In the Ventilation/Fan Mode (G on the thermostat), the indoor ate at minimum position. Otherwise, the damper will be closed. fan will run at low speed and the damper will operate at mini- mum position.

  • Page 65: Heating

    high speed and the LED error is cleared. If, for some reason the Heating over temperature limit opens prior to the start of the indoor fan In the Heating Mode (W1 on the thermostat), the ISC board sends blower, the unit will shorten the 45 second delay to 5 seconds less power to W on the IGC board.

  • Page 66: Nomenclature

    APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging 48 - Gas Heat Packaged Rooftop 0 = Standard 1 = LTL Model Series - WeatherExpert ® Electrical Options LC - Ultra High Efficiency A = None B = HACR Circuit Breaker...

  • Page 67: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling) 12.5 to 23 Tons 48LC*14 48LC*17 48LC*20 48LC*24 48LC*26 REFRIGERATION SYSTEM # Circuits / # Comp. / Type 1 / 2 / Scroll 1 / 2 / Scroll 1 / 2 / Scroll 1 / 2 / Scroll 1 / 2 / Scroll R-410A charge (lbs-oz)
  • Page 68 APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling) 12.5 to 23 Tons (cont) 48LC*14 48LC*17 48LC*20 48LC*24 48LC*26 HORIZONTAL Motor Qty. / Drive Type 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt Max BHP...
  • Page 69 APPENDIX B — PHYSICAL DATA Table B — Physical Data (Heating) 12.5 TO 23 Tons 48LC*14 48LC*17 48LC*20 48LC*24 48LC*26 GAS CONNECTION # of gas valves Natural gas supply line pressure (in. wg) / (psig) 4-13 / 0.18 - 0.47 4-13 / 0.18 - 0.47 4-13 / 0.18 - 0.47 4-13 / 0.18 - 0.47 4-13 / 0.18 - 0.47 Liquid propane supply line pressure (in.

  • Page 70: Appendix C - Fan Performance

    5. For information on the electrical properties of Carrier motors, please see the electrical information section of this book. 6. For more information on the performance limits of Carrier motors, see the application data section of this book. 7. The EPACT (Energy Policy Act) regulates energy requirements for specific types of indoor fan motors. Motors regulated...
  • Page 71 APPENDIX C — FAN PERFORMANCE Table D — 48LC**14 — 12.5 Ton Vertical Supply Available External Static Pressure (in. wg) 3750 0.48 0.69 0.91 1.13 1.36 4063 0.58 0.80 1.03 1.27 1.52 4375 0.69 0.92 1.16 1.42 1.68 4688 0.81 1.05 1.31 1.58...
  • Page 72 APPENDIX C — FAN PERFORMANCE Table E — 48LC**17 — 15 Ton Horizontal Supply Available External Static Pressure (in. wg) 4500 1.35 1.89 2.50 3.14 3.81 4875 1.62 2.19 2.83 3.50 4.20 5250 1.93 2.53 3.20 3.90 4.64 5625 2.28 2.91 3.61 4.34...
  • Page 73 APPENDIX C — FAN PERFORMANCE Table F — 48LC**17 — 15 Ton Vertical Supply Available External Static Pressure (in. wg) 4500 0.79 1.12 1.44 1.76 2.09 4875 0.94 1.31 1.65 1.99 2.34 5250 1.11 1.51 1.89 2.25 2.62 5625 1.30 1.73 2.14 2.54...
  • Page 74 APPENDIX C — FAN PERFORMANCE Table G — 48LC**20 — 17.5 Ton Horizontal Supply Available External Static Pressure (in. wg) 5250 1.93 2.53 3.20 3.90 4.64 5688 2.98 2.34 3.68 4.42 5.20 6125 2.82 3.50 4.23 5.01 5.82 6563 3.37 4.08 4.84 5.66...
  • Page 75 APPENDIX C — FAN PERFORMANCE Table H — 48LC**20 — 17.5 Ton Vertical Supply Available External Static Pressure (in. wg) 5250 1.11 1.51 1.89 2.25 2.62 5688 1.33 1.77 2.19 2.59 2.99 6125 1.59 2.06 2.52 2.96 3.39 6563 1.89 2.39 2.89 3.36...
  • Page 76 APPENDIX C — FAN PERFORMANCE Table I — 48LC**24 — 20 Ton Horizontal Supply Available External Static Pressure (in. wg) 6,000 2.68 3.34 4.07 4.83 5.64 6,500 3.29 3.99 4.75 5.56 6.41 7,000 4.00 4.74 5.53 6.38 7.27 7,500 4.80 5.58 6.42 7.31...
  • Page 77 APPENDIX C — FAN PERFORMANCE Table J — 48LC**24 — 20 Ton Vertical Supply Available External Static Pressure (in. wg) 6,000 1.51 1.98 2.42 2.85 3.27 6,500 1.84 2.34 2.83 3.30 3.76 7,000 2.22 2.75 3.29 3.81 4.30 7,500 2.66 3.20 3.79 4.35...
  • Page 78 APPENDIX C — FAN PERFORMANCE Table K — 48LC**26 — 23 Ton Horizontal Supply Available External Static Pressure (in. wg) 6,750 3.61 4.33 5.10 5.93 6.79 7,313 4.46 5.22 6.04 6.91 7.82 7,875 5.45 6.25 7.12 8.03 1003 8.98 8,438 6.58 7.43 8.33...
  • Page 79 APPENDIX C — FAN PERFORMANCE Table L — 48LC**26 — 23 Ton Vertical Supply Available External Static Pressure (in. wg) 6,750 2.02 2.54 3.05 3.55 4.03 7,313 2.49 3.03 3.60 4.14 4.67 7,875 3.03 3.59 4.20 4.80 1000 5.38 8,438 3.65 4.22 4.87...
  • Page 80 APPENDIX C — FAN PERFORMANCE Table M — Pulley Adjustment - Vertical Units MOTOR PULLEY TURNS OPEN MOTOR/DRIVE 48LC UNIT COMBO Standard static Medium static 3 phase High static Ultra static 1113 1098 1083 1068 1053 1038 1023 1008 Standard static Medium static 3 phase High static...

  • Page 81: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS Fig. B — Typical Electromechanical Control Wiring Diagram, 48LC 14-26...
  • Page 82 APPENDIX D — WIRING DIAGRAMS Fig. C — 48LC 14-26 Systemvu Control Schematic...
  • Page 83 APPENDIX D — WIRING DIAGRAMS Fig. D — 48LC 14-26 RTU-Open Control Wiring Diagram...
  • Page 84 APPENDIX D — WIRING DIAGRAMS NOTE: This power wiring diagram is typical for electromechanical, SystemVu™ and RTU Open units. Fig. E — Typical Power Wiring Diagram (48LC 14-20, 208/230-v shown)
  • Page 86 © 2020 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480153-01 Printed in U.S.A. Form 48LC-14-26-03SM Pg 86 2-2020 Replaces: 48LC-14-26-02SM...

  • Page 87: Start-Up Checklist

    UNIT START-UP CHECKLIST (Remove and Store in Job File) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sec- tions of this Installation Instruction document.
  • Page 88 10. Restore setpoints for thermostat and humidistat (Y/N) _____ REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS © 2020 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480153-01 Printed in U.S.A.

This manual is also suitable for:

Weatherexpert 48lc 17 seriesWeatherexpert 48lc 20 seriesWeatherexpert 48lc 24 seriesWeatherexpert 48lc 26 series

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