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

Single package rooftop gas heating/electric cooling unit
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Service and Maintenance Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 3
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 4
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . 4
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting Cooling System . . . . . . . . . . . . . . . 8
PURON® (R-410A) REFRIGERANT . . . . . . . . . . . . . 10
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 10
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . 11
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . 14
Non-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Unit-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . 15
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 16
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . 18
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . 21
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . 21
Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . 21
GAS HEATING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 21
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fuel Types and Pressures . . . . . . . . . . . . . . . . . . . . 22
Flue Gas Passageways . . . . . . . . . . . . . . . . . . . . . . . 23
Combustion-Air Blower . . . . . . . . . . . . . . . . . . . . . . 23
Burners and Igniters . . . . . . . . . . . . . . . . . . . . . . . . . 24
Burner Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480279-01
Printed in U.S.A.
Form 48LC-4-6-02SM
WeatherExpert
Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puron
Orifice Replacement . . . . . . . . . . . . . . . . . . . . . . . . .26
Troubleshooting Heating System . . . . . . . . . . . . . . .26
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
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
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . .33
RTU Open Control System . . . . . . . . . . . . . . . . . . . .35
SystemVu™ (Factory Option) . . . . . . . . . . . . . . . . . . 35
Economi$er® X (Factory Option) . . . . . . . . . . . . . . .35
Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Start Up with Assistant . . . . . . . . . . . . . . . . . . . . . . .46
VFD Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Fan Speed Relay Board . . . . . . . . . . . . . . . . . . . . . . .58
Configuration Jumpers . . . . . . . . . . . . . . . . . . . . . . .58
Variable Frequency Drive . . . . . . . . . . . . . . . . . . . . . 58
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . .60
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .61
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .62
APPENDIX C - FAN DATA . . . . . . . . . . . . . . . . . . . .63
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . .71
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 04-06
®
(R-410A) Refrigerant
®
2-2020
Replaces: 48LC-4-6-01SM

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  • Page 1: Table Of Contents

    WeatherExpert 48LC 04-06 ® Single Package Rooftop Gas Heating/Electric Cooling Unit with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions TABLE OF CONTENTS Orifice Replacement ......26 Minimum Heating Entering Air Temperature .
  • Page 2 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: Unit Arrangement And Access

    • Control box cleanliness and wiring condition UNIT ARRANGEMENT AND ACCESS • Wire terminal tightness General • Refrigerant charge level Figures 1 and 2 show general unit arrangement and access • Evaporator coil cleaning locations. • Evaporator blower motor amperage FILTER ACCESS PANEL HEATING •...

  • Page 4: Supply Fan (Blower) Section

    DIVIDER OUTSIDE HOOD CLEANABLE ALUMINUM FILTER FILTER Fig. 5 — Belt Drive Motor Mounting BAROMETRIC RELIEF BELT FILTER CLIP Check the belt condition and tension quarterly. Inspect the belt for Fig. 3 — Filter Installation signs of cracking, fraying or glazing along the inside surfaces. Check belt tension by using a spring-force tool (such as Brown- MANUAL OUTSIDE AIR HOOD SCREEN ing’s Part Number “Belt Tension Checker”...

  • Page 5: Cooling

    Check the condition of the motor pulley for signs of wear. Glazing MOTOR of the belt contact surfaces and erosion on these surfaces are signs When replacing the motor, also replace the external-tooth lock of improper belt tension and/or belt slippage. Pulley replacement washer (star washer) under the motor mounting base;...
  • Page 6 ® cleaner is essential to extend the life of coils. This cleaner is avail- able from Carrier Replacement Components Division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is recommended that all...

  • Page 7: Evaporator Coil

    11. Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle. Pro- CAUTION tect fins from damage from the spray nozzle. UNIT DAMAGE HAZARD Evaporator Coil Failure to follow this caution may result in reduced unit perfor- CLEANING THE EVAPORATOR COIL mance or unit shutdown.

  • Page 8: Compressor

    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 9 Table 1 — Cooling Service Analysis PROBLEM CAUSE REMEDY Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or control Replace component. Compressor and Condenser relay. Fan Will Not Start Insufficient line voltage.

  • Page 10: Puron® (R-410A) Refrigerant

    Recheck the liq- Amount of refrigerant charge is listed on the unit’s nameplate. Re- uid pressure as charge is adjusted. fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec- EXAMPLE: lamation training manual and the following procedures.

  • Page 11: Cooling Charging Charts

    COOLING CHARGING CHARTS Fig. 13 — 48LC**04 Cooling Charging Chart...
  • Page 12 Fig. 14 — 48LC**05 Cooling Charging Chart...
  • Page 13 Fig. 15 — 48LC**06 Cooling Charging Chart...

  • Page 14: Thermostatic Expansion Valve (Txv)

    THERMOSTATIC EXPANSION VALVE (TXV) Two types of convenience outlets are offered on 48LC models: non-powered and unit-powered. Both types provide a 125-v GFCI All 48LC units have a factory-installed nonadjustable thermostatic (ground-fault circuit-interrupter) duplex receptacle rated at 15-A expansion valve (TXV). The TXV will be a bi-flow, bleed port ex- behind a hinged waterproof access cover, located on the end panel pansion valve with an external equalizer.

  • Page 15: Smoke Detectors

    necessary for operation are factory-provided and mounted. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements. System The smoke detector system consists of a four-wire controller and one or two sensors.

  • Page 16: Smoke Detector Locations

    action to shut down fans and blowers, change over air handling RETURN AIR WITHOUT ECONOMIZER systems, notify the fire alarm control panel, etc. The sampling tube is located across the return air opening on the The sensor uses a process called differential sensing to prevent unit basepan.

  • Page 17: Fiop Smoke Detector Wiring And Response

    Screw the sensor and detector plate into its operating position FIOP Smoke Detector Wiring and Response using screws from Step 1. Make sure the sampling tube con- ALL UNITS nection is on the bottom and the exhaust tube is on the top. FIOP smoke detector is configured to automatically shut down all See Fig.

  • Page 18: Sensor And Controller Tests

    FIOP/ PL19- POWER ACCESSORY 24 VAC RETURN SMOKE RJ-45 SENSOR SUPPLY FROM POWER SCHEMATIC RJ-45 SMOKE TRAN SENSOR TROUBLE 3.2 AMPS GRN/YEL ALARM CONTROL BD SMOKE CONTROL MODULE FIOP/ACCESSORY TRAN LCTB-C COFS(FIOP) COFS FIOP/ACCY CCHTS CCHR CONT RED GRA 460/575V ONLY FOR FIELD USE UNIT JMP2...
  • Page 19 operate the controller’s supervision relay. For more information, Table 2 — Dirty LED Test see “Changing the Dirty Sensor Test.” FLASHES DESCRIPTION 0-25% dirty (Typical of a newly installed detector) SMOKE DETECTOR 25-50% dirty CONTROLLER 51-75% dirty − 76-99% dirty AUXILIARY Dirty Sensor Test Procedure EQUIPMENT...

  • Page 20: Indicators

    to remove dirt and other contaminants from the gasket on the • The contacts on the controller’s two auxiliary relays switch positions. sensor’s cover. • The contacts on the controller’s alarm initiation relay Squeeze the retainer clips on both sides of the optic housing close.

  • Page 21: Resetting Alarm And Trouble Condition Trips

    Resetting Alarm and Trouble Condition Trips PROTECTIVE DEVICES Manual reset is required to restore smoke detector systems to Nor- Compressor Protection mal operation. For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an alarm or OVERCURRENT trouble condition.

  • Page 22: Fuel Types And Pressures

    Table 4 — Natural Gas Supply Line Pressure Ranges INDUCED- ROLLOUT UNIT MODEL UNIT SIZE DRAFT SWITCH MOTOR 4.0 in. wg 13.0 in. wg 48LCD/E/L/M/S/R* 04, 05, 06 MOUNTING (996 Pa) (3240 Pa) PLATE 48LCF/N/T* 5.0 in. wg 13.0 in. wg 05, 06 (High Heat units only) (1245 Pa)

  • Page 23: Flue Gas Passageways

    Combustion-Air Blower LP LPS Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi- J2-11 monthly to determine proper cleaning frequency. To access burner section, slide the sliding burner partition out of the unit.

  • Page 24: Burners And Igniters

    Burners and Igniters INTEGRATED GAS UNIT RACEWAY CONTROLLER (IGC) CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this CAUTION can result in premature wear and damage to equipment. When working on gas train, do not hit or plug orifice spuds. MAIN BURNERS To access burners, remove burner access panel and slide out burn- er partition.

  • Page 25: Burner Ignition

    LOW HEAT 72,000 BTUH INPUT AND 60,000 BTUH INPUT MEDIUM AND HIGH HEAT 115,000 BTUH INPUT, 150,000 BTUH INPUT, 90,000BTUH INPUT AND 120,000 BTUH INPUT Fig. 38 — Spark Adjustment (04-06) Gas Valve Adjust high-stage pressure to specified setting by turning the plastic adjustment screw clockwise to increase pressure, All three-phase models (except Low NOx) are equipped with 2- counter-clockwise to decrease pressure.

  • Page 26: Orifice Replacement

    When replacing unit orifices, order the neces- and the indoor (evaporator) fan ON/OFF times will be reset. The sary parts via Carrier RCD. See Table 10 for available orifice siz- LED error code can be observed through the viewport. During ser- es.
  • Page 27 RED LED - STATUS Fig. 41 — Integrated Gas Control (IGC) Board...
  • Page 28 L1, CM Indoor fan control box relay J2, 1 Gas valve (heat stage 1) gas section relay J2, 11-12 Table 10 — Orifice Sizes ORIFICE CARRIER DRILL DRILL SIZE PART NUMBER DIA. (in.) LH32RF129 0.1285 LH32RF125 0.1250 LH32RF120 0.1200 LH32RF116 0.1160...
  • Page 29 Table 11 — Altitude Compensation* (48LCD/E/F/S/R/T*04-06) 72,000 BTUH 115,000 BTUH 150,000 BTUH NOMINAL NOMINAL NOMINAL ELEVATION ft (m) ORIFICE SIZE ORIFICE SIZE ORIFICE SIZE ORIFICE SIZE ORIFICE SIZE ORIFICE SIZE 30† 0-2000 (610) 30† 2000 (610) 3000 (914) 4000 (1219) 5000 (1524) 6000 (1829) 7000 (2134)
  • Page 30 Table 13 — Heating Service Analysis PROBLEM CAUSE REMEDY Misaligned spark electrodes. Check flame ignition and sensor electrode positioning. Adjust as needed. Check gas line for air, purge as necessary. After purging gas line of air, allow gas to dissipate for at least 5 minutes before attempting to relight unit. No gas at main burners.
  • Page 31 Table 14 — IGC Board LED Alarm Codes ACTION TAKEN BY FLASH DESCRIPTION RESET METHOD PROBABLE CAUSE CONTROL CODE Normal Operation — — — Loss of power to the IGC. Check 5 amp fuse on IGC, power to unit, 24V circuit 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 Follow recognized safety practices and wear approved repair or final unit disposal.

  • Page 33: Outdoor-Air Inlet Screens

    Outdoor-Air Inlet Screens Heating Outdoor-air inlet screen must be in place before operating unit. Purge gas supply line of air by opening union ahead of the gas valve. If gas odor is detected, tighten union and wait 5 min- Compressor Mounting utes before proceeding Compressors are internally spring mounted.
  • Page 34 FIELD CONTROL WIRING CONNECTOR The 48LC unit requires an external temperature control device such as a thermostat (field-supplied). THERMOSTAT Install a Carrier-approved accessory thermostat according to in- HIGH VOLTAGE stallation instructions included with the accessory. For complete CONDUIT CONNECTOR economizer function and 3 stage compressor operation, select a three-stage cooling thermostat.

  • Page 35: Rtu Open Control System

    by moving the black wire with the -in. female spade connector from the 230-v connection and moving it to the 208-v -in. male Typical Central terminal on the primary side of the transformer. Refer to unit label Thermostat Terminal diagram for additional information. Connections Board RTU Open Control System...
  • Page 36 S-Bus Enthalpy Control Sensors OUTPUTS The sensor is a combination temperature and humidity sensor Actuator Signal which is powered by and communicates on the S-Bus. Up to three 2 to 10 vdc; minimum actuator impedance is 2k ohm; bus two- sensors may be configured with the W7220 economizer module.
  • Page 37 Table 15 — Economizer Module - Left Hand Terminal Blocks LABEL TYPE DESCRIPTION Top Left Terminal Block 20k NTC Mixed Air Temperature Sensor (Polarity and COM Insensitive Connection) 20k NTC Outdoor Air Temperature Sensor (Polarity and COM Insensitive Connection) S-BUS S-BUS Enthalpy Control Sensor S-BUS...
  • Page 38 To use the keypad when working with Setpoints, System and Ad- SENSOR vanced Settings, Checkout tests and Alarms: Navigate to the desired menu. (HOT) BLACK Press the (Enter) button to display the first item in the currently displayed menu. YELLOW ANALOG Use the ▲...
  • Page 39 Table 19 — 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 40 Table 19 — 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 41 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † Display order = MM/DD/YY INSTALL 01/01/10 Setting order = DD, MM, then YY. UNITS DEG °F °F or °C Sets economizer controller in degrees Fahrenheit or Celsius CONV CONV = conventional;...
  • Page 42 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † RETURN AIR TEMPERATURE CALIBRATION RA T CAL 0.0°F ± 2.5°F Allows for the operator to adjust for an out of calibration temperature sensor.
  • Page 43 Table 19 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † ACTUATOR VOLTAGE LOW ACT UNDER V Voltage received by actuator is above expected range. ALARMS ACTUATOR VOLTAGE HIGH ACT OVER V (cont) Voltage received by actuator is below expected range.
  • Page 44 Table 22 — Dry Bulb 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...
  • Page 45 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 52 — Single Enthalpy Curve Boundaries Table 25 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 46: Vfd Operation With Remote Keypad

    lower left-hand box on the display screen. The function of SOFT KEY 2 matches the word in the lower right-hand box on the dis- CAUTION play screen. If the box is empty, then the SOFT KEY does not have a function on that specific screen. The UP and DOWN keys EQUIPMENT DAMAGE HAZARD are used to navigate through the menus.

  • Page 47: Start Up By Changing Parameters Individually

    RJ-45 (CAT5) Cable ABB VFD (Bundled with Control Harness) w/ Remote Keypad Fig. 54 — Location of VFD in 48LC 04-06 Units Start Up by Changing Parameters Individually VFD Modes Initial start-up is performed at the factory. To start up the VFD by The VFD has several different modes for configuring, operating, changing individual parameters, perform the following procedure: and diagnosing the VFD.
  • Page 48 To view the default parameter value, press the UP and The text “Restoring Parameters” will be displayed with a DOWN keys simultaneously. To restore the default factory set- progress indicator. To stop the process, select ABORT (SOFT tings, select the Carrier application macro. KEY 1).
  • Page 49 When the download is complete, the text “Parameter down- keys to change the parameter setting. Press OK (SOFT KEY load successful” will be displayed. 2) to save the configuration and return to the Clock Set menu. The display will then return to the PAR BACKUP menu. Use the UP or DOWN keys to highlight SET TIME and press Select EXIT (SOFT KEY 1) to return to the main menu.
  • Page 50 Table 26 — 48LC 04 VFD Parameters UNIT SIZE 48LC 04 Motor Description 1.7 HP 575v 1.7 HP 208-230v 1.7 HP 460v 2.4 HP 575v 2.4 HP 208-230v Drive/Motor Voltage 575v 208-230v 460v 575v 208-230v Motor Part Number HD56FR579 HD56FR233 HD56FR463 HD56FE577 HD56FE653...
  • Page 51 Table 27 — 48LC 04-06 VFD Parameters UNIT SIZE 48LC 04 48LC 05 48LC 06 Motor 2.4 HP 460v 1.7 HP 575v 1.7 HP 208-230v 1.7 HP 460v 2.4 HP 575v Description Drive/motor 460v 575v 208-230v 460v 575v Voltage Motor Part HD56FE653 HD56FR579 HD56FR233...
  • Page 52 Table 27 — 48LC 04-06 VFD Parameters (cont) UNIT SIZE 48LC 04 48LC 05 48LC 06 Motor 2.4 HP 460v 1.7 HP 575v 1.7 HP 208-230v 1.7 HP 460v 2.4 HP 575v Description Drive/motor 460v 575v 208-230v 460v 575v Voltage Motor Part HD56FE653 HD56FR579...
  • Page 53 Table 28 — 48LC 05-06 VFD Parameters UNIT SIZE 48LC 06 48LC 05/06 2.4 HP 208- 2.9 HP 208- Motor Description 2.4 HP 460v 2.9 HP 460v 3.7 HP 575v 230v 230v Drive/Motor Voltage 208-230v 460v 208-230v 460v 575v Motor Part Number HD56FE653 HD56FE653 HD58FE654...
  • Page 54 VFD DIAGNOSTICS Correcting Faults The recommended corrective action for faults is shown in The drive detects error situations and reports them using: Table 29. The VFD can also be reset to remove the fault. If an ex- Green and red LEDs on the body of the drive (located under ternal source for a start command is selected and is active, the the keypad) VFD may start immediately after fault reset.
  • Page 55 Internal fault. A communication-related problem has been detected between the OMIO and OINT OPEX LINK boards. Contact Carrier. OPEX PWR Internal fault. Low voltage condition detected on the OINT board. Contact Carrier. CURR MEAS Internal fault. Current measurement is out of range. Contact Carrier. SUPPLY PHASE Ripple voltage in the DC link is too high.
  • Page 56 Table 29 — Fault Codes (cont) FAULT CODE FAULT NAME IN PANEL DESCRIPTION AND RECOMMENDED CORRECTIVE ACTION Parameter values are inconsistent. Check that 2007 MINIMUM FREQ is negative, when 8123 PFA PAR PFA REFNG 1001 ENABLE is active. Parameter values are inconsistent. The number of programmed PFA relays does not match with Interlock configuration, when 8123 PFA ENABLE is active.
  • Page 57 Table 30 — Alarm Codes ALARM CODE ALARM NAME IN PANEL DESCRIPTION AND RECOMMENDED CORRECTIVE ACTION Reserved 2001 Reserved 2002 Reserved 2003 The change in direction being attempted is not allowed. Do not attempt to change the direction of DIR LOCK motor rotation, or change parameter 1003 DIRECTION to allow direction change (if reverse operation 2004 is safe).

  • Page 58: Fan Speed Relay Board

    Connector J2 is connected to the 24-VDC output circuit that connects to the VFD’s terminal strip. IMPORTANT: DO NOT use ABB or Carrier Start-Up See Fig. 58 (on page 59) for a simplified connection schematic for Assistant on this VFD application! Fan Speed Relay board and the VFD.
  • Page 59 ACS320 VFD TERMINAL 24vdc JMP2 Lo Spd Hi Spd 4 & 5 JMP1 HUMID ACH550 VFD TERMINAL 24vdc JMP2 Lo Spd Hi Spd 4 & 5 JMP1 HUMID Fig. 58 — Connection Schematic - Fan Speed Relay Board and VFD...

  • Page 60: Fastener Torque Values

    Table 32 — ACS320 VFD Terminal Designations ACH550 VFD TERMINAL STRIP TERMINAL FUNCTION Three-Phase main circuit input power supply Three-Phase AC output to motor, 0V to maximum input voltage level 10 (GND) Factory-supplied jumper 12 (COMMON) 9 (24 VDC) Run (factory-supplied jumper) 11 (DI-1) 9 (24 VDC) Start Enable 1 (factory-supplied jumper).

  • Page 61: 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 –...

  • Page 62: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table A — 48LC**04-06 Physical Data (3 to 5 Tons) 48LC*004 48LC*A04 48LC*005 48LC*A05 48LC*006 48LC*A06 REFRIGERATION SYSTEM # Circuits / # Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll...

  • Page 63: Appendix C - Fan Data

    Carrier recommends the lower horsepower option. 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.
  • Page 64 APPENDIX C — FAN DATA Table B — 48LC**04 Direct Drive (Horizontal) Table C — 48LC**04 Direct Drive (Vertical) SPEED SPEED (TORQUE) TAP (TORQUE) TAP 0.39 0.19 0.27 0.15 0.18 0.14 0.07 0.11 1050 — — 1050 — — 1125 —...
  • Page 65 APPENDIX C — FAN DATA Table D — 48LC**05 Direct Drive (Horizontal) Table E — 48LC**05 Direct Drive (Vertical) SPEED SPEED (TORQUE) TAP (TORQUE) TAP 1000 0.12 0.14 1000 0.08 0.11 1200 0.00 0.21 1200 — — 1400 — — 1400 —...
  • Page 66 APPENDIX C — FAN DATA Table F — 48LC**06 Direct Drive (Horizontal) Table G — 48LC**06 Direct Drive (Vertical) SPEED SPEED (TORQUE) TAP (TORQUE) TAP 1250 0.04 0.18 1250 0.03 0.16 1500 — — 1500 — — 1750 — — 1750 —...
  • Page 67 APPENDIX C — FAN DATA Table H — 48LC**04 Horizontal Supply (3 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.14 0.24 0.35 0.48 1007 0.63 0.16 0.26 0.38 0.51 1023 0.66 0.18 0.29 0.41 0.55 1040 0.70 1050 0.21 0.32 0.45 0.58 1057...
  • Page 68 APPENDIX C — FAN DATA Table J — 48LC**05 Horizontal Supply (4 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.24 0.35 0.48 0.63 1074 0.78 1200 0.29 0.41 0.54 1019 0.69 1099 0.85 1300 0.34 0.46 0.60 1046 0.75 1125 0.92 1400 0.40...
  • Page 69 APPENDIX C — FAN DATA Table L — 48LC**06 Horizontal Supply (5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.41 0.55 1002 0.71 1088 0.87 1167 1.05 1500 0.50 0.65 1041 0.81 1125 0.98 1202 1.17 1625 0.60 0.76 1081 0.93 1163 1.11...
  • Page 70 APPENDIX C — FAN DATA Table N — PULLEY ADJUSTMENT MOTOR PULLEY TURNS OPEN MOTOR/DRIVE UNIT COMBO Standard Static* — — — — — — — — — — — 3 phase Medium Static 1175 1135 1094 1054 1013 High Static 1466 1423 1380...

  • Page 71: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS Fig. B — 48LC**04-06 Control Wiring Diagram...
  • Page 72 APPENDIX D — WIRING DIAGRAMS Fig. C — 48LC**04-06 Control Wiring Diagram with Humidi-MiZer System ®...
  • Page 73 APPENDIX D — WIRING DIAGRAMS Fig. D — 48LC**04-06 Power Wiring Diagram (208/230-3-60, 460-3-60)
  • Page 74 APPENDIX D — WIRING DIAGRAMS Fig. E — 48LC**04-06 Power Wiring Diagram (575-3-60) © 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. 04-53480279-01 Printed in U.S.A.

  • Page 75: Start-Up Checklist

    START-UP CHECKLIST FOR 48LC SINGLE PACKAGE ROOFTOP COOLING ONLY (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 preced- ing sections of this Installation Instruction document.
  • Page 76 10. Restore set-points 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. 04-53480279-01 Printed in U.S.A.

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