Carrier WeatherExpert 50LC 14 Series Service And Maintenance Instructions
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Carrier WeatherExpert 50LC 14 Series Service And Maintenance Instructions

Single package rooftop cooling only with puron (r-410a) refrigerant
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Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 3
Supply Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 3
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil Metering Devices . . . . . . . . . . . . . . . 6
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . . 6
Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . 13
Troubleshooting Cooling System. . . . . . . . . . . . . . . 13
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . 15
Wet in Use Convenience Outlet Cover. . . . . . . . . . . 15
Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Non-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Unit-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fuse On Powered Type . . . . . . . . . . . . . . . . . . . . . . . 17
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . 17
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 18
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . 19
Controller Alarm Test Procedure . . . . . . . . . . . . . . . 20
Dirty Controller Test Procedure . . . . . . . . . . . . . . . . 20
Dirty Sensor Test Procedure. . . . . . . . . . . . . . . . . . . 20
Changing the Dirty Sensor Test . . . . . . . . . . . . . . . . 20
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 22
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . 22
Supply (Indoor) Fan Motor Protection . . . . . . . . . . . 23
Condenser Fan Motor Protection . . . . . . . . . . . . . . . 23
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . 23
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . 23
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500167-01
Printed in U.S.A.
Form 50LC-14-26-03SM
Single Package Rooftop Cooling Only
with Puron
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Low-Voltage Control Connections . . . . . . . . . . . . . .25
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . .25
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .31
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . .31
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .31
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Refrigerant Service Ports. . . . . . . . . . . . . . . . . . . . . .31
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . .32
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Ventilation (Continuous Fan). . . . . . . . . . . . . . . . . . .32
RTU Open Control System. . . . . . . . . . . . . . . . . . . . .34
SYSTEMVU™ (FACTORY OPTION) . . . . . . . . . . . . . .34
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . .36
Staged Air Volume (SAV™) with Variable Frequency
Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
FASTENER TORQUE VALUES. . . . . . . . . . . . . . . . . .62
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . .62
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Economizer (Optional) . . . . . . . . . . . . . . . . . . . . . . . .63
(4°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .64
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .65
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . .72
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.
Pg 1
WeatherExpert
50LC*D14-D26
®
(R-410A) Refrigerant
2-2020
Replaces: 50LC-14-26-02SM
®

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  • Page 1: Table Of Contents

    ® WeatherExpert 50LC*D14-D26 Single Package Rooftop Cooling Only ® with Puron (R-410A) Refrigerant Service and Maintenance Instructions CONTENTS Single Point Boxes and Supplementary Fuses ..24 Safety Devices ......24 SAFETY CONSIDERATIONS .

  • Page 2: General

    Follow all safety codes, including ANSI (American National Standards Institute) Z223.1. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire FILTER ACCESS extinguisher available for all brazing operations. PANEL It is important to recognize safety information. This is the safety- alert symbol .

  • Page 3: Supply Fan (Blower) Section

    outside damper added, inlet screen supported by two greaseable pillow block concentric bearings. will also be present. A fixed-pitch driven (fan) pulley is attached to the fan shaft and an adjustable-pitch driver pulley is mounted on the motor. Each of these filters and screens will need to be periodically re- The pulleys are connected using a “V”...

  • Page 4: Changing Fan Wheel Speed By Changing Pulleys

    To replace the belt: exceed maximum speed listed in the Product Data or motor amperage as listed on the unit rating plate. Use a belt with same section type or similar size. Do not Set movable flange at nearest keyway or flat of pulley hub substitute a “FHP”...

  • Page 5: Cooling

    Monthly cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is cleaner solution to all coil surfaces including finned area, available from Carrier Replacement parts division as part tube sheets and coil headers.

  • Page 6: Evaporator Coil Metering Devices

    -in. SAE Male Flare Amount of refrigerant charge is listed on the unit’s nameplate. couplings. Refer to Carrier GTAC2-5 Charging, Recovery, Recycling and The brass fittings are two-piece High Flow valves, with a re- Reclamation training manual and the following procedures.

  • Page 7: Evacuation

    LOW-CHARGE COOLING 5000 Using Cooling Charging Charts (Fig. 10-14.), vary refrigerant 4500 until the conditions of the appropriate chart are met. Note the charging charts are different from the type normally used. 4000 Charts are based on charging the units to the correct subcooling LEAK IN 3500 SYSTEM...
  • Page 8 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 9 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 10 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 11 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 12 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 13: 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 14 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 Replace component. control relay. Compressor and Condenser Fan Will Not Start.

  • Page 15: Convenience Outlets

    CONVENIENCE OUTLETS GFCI RECEPTACLE COVER - WHILE-IN-USE NOT INCLUDED WEATHERPROOF WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal inju- ry or death. Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status be- fore opening unit for service.
  • Page 16 UNIT CONNECT PRIMARY TRANSFORMER VOLTAGE CONNECTIONS TERMINALS L1: RED +YEL H1 + H3 208, 230 L2: BLU + GRA H2 + H4 L1: RED Splice BLU + YEL H2 + H3 L2: GRA L1: RED L2: GRA Fig. 18 — Powered Convenience Outlet Wiring...

  • Page 17: Maintenance

    Maintenance Periodically test the GFCI receptacle by pressing the TEST DUCT SMOKE SENSOR CONTROLLER button on the face of the receptacle. This should cause the in- ternal 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 18: Smoke Detector Locations

    Air is introduced to the duct smoke detector sensor’s sensing chamber through a sampling tube that extends into the HVAC duct and is directed back into the ventilation system through a (shorter) exhaust tube. The difference in air pressure between the two tubes pulls the sampled air through the sensing cham- ber.

  • Page 19: Fiop Smoke Detector Wiring And Response

    Fig. 24 — Typical Smoke Detector System Wiring FIOP Smoke Detector Wiring and Response Sensor and Controller Tests ALL UNITS SENSOR ALARM TEST FIOP smoke detector is configured to automatically shut down The sensor alarm test checks a sensor’s ability to signal an all unit operations when smoke condition is detected.

  • Page 20: Controller Alarm Test Procedure

    Controller Alarm Test Procedure Press the controller’s test/reset switch for seven seconds. IMPORTANT: OPERATIONAL TEST ALERT Verify that the controller’s Alarm LED turns on. Failure to follow this ALERT can result in an unnecessary evacuation of the facility. Reset the sensor by pressing the test/reset switch for two Changing the dirty sensor test operation will put the detec- seconds.

  • Page 21: Detector Cleaning

    DIRTY SENSOR TEST USING AN SD-TRK4 Turn the key switch to the RESET/TEST position for two seconds. SMOKE DETECTOR Verify that the test/reset station’s Trouble LED flashes. CONTROLLER − Detector Cleaning AUXILIARY EQUIPMENT CLEANING THE SMOKE DETECTOR Clean the duct smoke sensor when the Dirty LED is flashing continuously or sooner if conditions warrant.

  • Page 22: Resetting Alarm And Trouble Condition Trips

    ALARM STATE Troubleshooting The smoke detector enters the alarm state when the amount of CONTROLLER’S TROUBLE LED IS ON smoke particulate in the sensor’s sensing chamber exceeds the Check the Trouble LED on each sensor connected to the alarm threshold value. (See Table 3.) Upon entering the alarm controller.

  • Page 23: Supply (Indoor) Fan Motor Protection

    LOW PRESSURE SWITCH Condenser Fan Motor Protection Each system is protected against a loss of charge and low evap- The condenser fan motors are internally protected against over orator coil loading condition by a low pressure switch located temperature. on the suction line near the compressor. The switch is stem- Control Circuit, 24-V mounted.

  • Page 24: Single Point Boxes And Supplementary Fuses

    Fig. 30 — Typical Module Installation Single Point Boxes and Supplementary Fuses When the unit MOCP device value exceeds 60-A, unit-mount- ed supplementary fuses are required for each heater circuit. These fuses are included in accessory single point box, with power distribution and fuse blocks.

  • Page 25: Low-Voltage Control Connections

    INSULATED TERMINALS AT LIMITS BLACK 12 GA. HTR 2 RED (HI-TEMP) HTR 1 BLACK 12 GA. 18 GA. RED (HI-TEMP) FEED WIRES THRU STRAIN RELIEF BUSHING 12 GA. IN CONTROL PANEL 12 GA. BLACK 12 GA. YELLOW BLUE 12 GA. BLACK 12 GA.
  • Page 26 Fig. 34 — 50LC 14-26 Control Wiring Diagram...
  • Page 27 Fig. 35 — 50LC 14-26 RTU Open Control Wiring Diagram...
  • Page 28 Fig. 36 — 50LC 14-20 208/230V 3 Phase Power Wiring Diagram...
  • Page 29 Fig. 37 — 50LC 24-26 208/230V 3 Phase Power Wiring Diagram...
  • Page 30 Fig. 38 — 50LC 14-26 460V, 575V 3 Phase Power Wiring Diagram...

  • Page 31: 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 Failure to follow this warning could result in personal inju- or death. ry or death. Relieve pressure and recover all refrigerant before system Follow recognized safety practices and wear approved repair or final unit disposal.

  • Page 32: Compressor Rotation

    THERMOSTAT Compressor Rotation On 3-phase units with scroll compressors, it is important to be cer- Install a Carrier-approved accessory thermostat according to tain compressor is rotating in the proper direction. To determine installation instructions included with the accessory. For com-...
  • Page 33 Route the low voltage wire to the Integrated Staging Control (ISC) board. See Fig. 40. NOTE: If utilizing the through the base connections, route the low voltage wire through the wire ties to the ISC board. CONTROL BOX ACCESS Configure for Electric Heat: To configure the factory-approved PANEL thermostat, open the Advanced Setup menu, scroll down to ELECTRIC HEAT and change RANGE value from OFF to...

  • Page 34: Rtu Open Control System

    Integrated Staging Control (ISC) Board ISC BOARD - SEQUENCE OF OPERATION General The Carrier Integrated Staging Control (ISC) is intended for use with a standard thermostat or direct digital control (DDC) capable of three cooling stages. After initial power to the board, a Green LED will blink with a one second duty cycle in- dicating the unit is running properly.
  • Page 35 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 Low-Pressure Switch Outdoor Fan Indoor Fan High-Pressure...

  • Page 36: Economi$Er X (Factory Option)

    Low Ambient Cooling Operation Down to 40°F (4°C) ® EconoMi$er X (Factory Option) In low ambient RTU conditions when the temperature is be- The EconoMi$er X system is an expandable economizer con- tween 55°F (13°C) and 40°F (4°C), the low ambient switch trol system, which includes a W7220 economizer module (con- (LAS) will be active and the outdoor-fans will run to the pre- troller) with an LCD and keypad (see Fig.
  • Page 37 User Interface ENVIRONMENTAL Provides status for normal operation, setup parameters, check- Operating Temperature out tests, and alarm and error conditions with a 2-line 16 char- –40°F to 150°F (–40°C to 65°C). acter LCD display and four button keypad. Exception of display operation down to –4°F (–20°C) with full Electrical recovery at –4°F (–20°C) from exposure to –40°F (–40°C) •...
  • Page 38 Table 7 — 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 (Sylk* Bus)
  • Page 39 To use the keypad when working with Setpoints, System and SENSOR Advanced 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 Use the ▲ and ▼ buttons to scroll to the desired ANALOG BROWN parameter.
  • Page 40 Table 11 — 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 41 Table 11 — 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 42 Table 11 — 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 43 Table 11 — 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 44 Table 11 — 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 45 Table 13 — 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 46 Table 16 — 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 47 Table 18 — 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 48 Table 20 — 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 49 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 53 — Single Enthalpy Curve Boundaries Table 22 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 50: Drive

    If one or more alarms are present and there has been no keypad activity for at least 5 minutes, the Alarms menu displays and 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.

  • Page 51: Multi-Speed Vfd Display Kit

    The VFD keypad (as shown in Fig. 56) consists of the follow- ing sections. 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.
  • Page 52 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 53 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. 63 — Keypad with Power Up Screen Displayed To program the VFD for 3 discreet indoor fan motor speeds At Power-Up: At the first power up, the LCD displays the Select Lan- guage screen (see Fig.
  • Page 54 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 55 d. Press ▼ (Down Arrow) until the following display Setting References: appears: a. Press the Menu key to move the ▼ (triangle icon) so it is positioned over Main Menu. The display shows 1—6* Load Depen. Setting the following: 1—7* Start Adjustments 0—** Operation / Display e.
  • Page 56 Setting the Ramp Time: Table 23-27 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 57 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 58 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 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 HD60FE656 HK30WA372 131L9797 [102] [11] 11.7...
  • 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 HD60FK657 HK30WA373 131L9798 [102] [14] 21.2...

  • Page 62: Fastener Torque Values

    SEQUENCE OF OPERATION FASTENER TORQUE VALUES General Table 28 — Torque Values The Carrier Integrated Staging Control Board (ISC) is intended for use with a standard thermostat capable of three cooling stag- LOCATION TORQUE VALUES es. After initial power to the board, a Green LED will blink with Supply fan motor mounting 120 ±...

  • Page 63: Ventilation

    Ventilation Low Ambient Cooling Operation down to 40°F (4°C) In the Ventilation/Fan Mode (G on the thermostat), the indoor fan will run at low speed and the damper will operate at mini- In Low Ambient RTU conditions when the temperature is be- mum position.

  • Page 64: 6Appendix A - Model Number Nomenclature

    APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging 50 - Electric Cooling 0 = Standard Packaged Rooftop 1 = LTL Electrical Options Model Series - WeatherExpert ®...

  • Page 65: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling) 12.5-23 Tons 50LC*14 50LC*17 50LC*20 50LC*24 50LC*26 REFRIGERATION SYSTEM # Circuits / # Comp. / Type 1/2/Scroll 1/2/Scroll 1/2/Scroll 1/2/Scroll 1/2/Scroll R-410A charge (lb-oz) 32-0 33-6 35-6 40-10 43-4 Alternate (Humidi-Mizer ®...
  • Page 66 APPENDIX B — PHYSICAL DATA Table A — Physical Data (Cooling) 12.5-23 Tons (cont) 50LC*14 50LC*17 50LC*20 50LC*24 50LC*26 Motor Qty. / Drive Type 1/Belt 1/Belt 1/Belt 1/Belt 1/Belt Max BHP RPM range 644-808 651-818 651-818 707-888 859-1026 Medium Static Motor frame size 184T 213T...
  • Page 67 % Voltage Imbalance = 100x = 1.78% stitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.
  • Page 68 % Voltage Imbalance = 100x = 1.78% stitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.
  • Page 69 % Voltage Imbalance = 100x = 1.78% stitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.
  • Page 70 % Voltage Imbalance = 100x = 1.78% stitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.
  • Page 71 % Voltage Imbalance = 100x = 1.78% stitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. This amount of phase imbalance is satisfactory as it is below the maxi- mum allowable 2%.

  • Page 72: Appendix C - Fan Performance

    Carrier recommended the lower horsepower option. For information on the electrical properties of Carrier motors, please see the Electrical information section of this book. For more information on the performance limits of Carrier motors, see the application data section of this book.
  • Page 73 APPENDIX C — FAN PERFORMANCE Table G — 50LC**14 — 12.5 Ton Vertical Supply Available External Static Pressure (in. wg) 3750 0.41 0.61 0.82 1.03 1.25 4063 0.49 0.70 0.93 1.15 1.39 4375 0.57 0.80 1.04 1.28 1.53 4688 0.67 0.91 1.16 1.42...
  • Page 74 APPENDIX C — FAN PERFORMANCE Table I — 50LC**17 — 15 Ton Vertical Supply Available External Static Pressure (in. wg) 4500 0.55 0.88 1.19 1.48 1.79 4875 0.65 0.99 1.34 1.66 1.99 5250 0.77 1.11 1.50 1.86 2.20 5625 0.91 1.24 1.67 2.06...
  • Page 75 APPENDIX C — FAN PERFORMANCE Table K — 50LC**20 — 17.5 Ton Vertical Supply Available External Static Pressure (in. wg) 5250 0.77 1.11 1.50 1.86 2.20 5688 0.94 1.26 1.69 2.09 2.47 6125 1.14 1.43 1.89 2.34 2.76 6563 1.37 1.64 2.11 2.60...
  • Page 76 APPENDIX C — FAN PERFORMANCE Table L — 50LC**20 — 17.5 Ton Horizontal Supply Available External Static Pressure (in. wg) 5250 1.40 1.93 2.51 3.14 3.81 5688 1.70 2.24 2.86 3.52 4.21 6125 2.03 2.61 3.24 3.93 4.66 6563 2.41 3.01 3.68 4.39...
  • Page 77 APPENDIX C — FAN PERFORMANCE Table M — 50LC**24 — 20 Ton Vertical Supply Available External Static Pressure (in. wg) 6,000 1.08 1.38 1.84 2.27 2.68 6,500 1.33 1.61 2.07 2.57 3.03 7,000 1.63 1.89 2.33 2.87 3.39 7,500 1.97 2.22 2.63 3.19...
  • Page 78 APPENDIX C — FAN PERFORMANCE Table N — 50LC**24 — 20 Ton Horizontal Supply Available External Static Pressure (in. wg) 6,000 1.93 2.50 3.13 3.81 4.53 6,500 2.36 2.95 3.61 4.32 5.07 7,000 2.85 3.47 4.16 4.90 5.68 7,500 3.41 4.07 4.78 5.55...
  • Page 79 APPENDIX C — FAN PERFORMANCE Table O — 50LC**26 — 23 Ton Vertical Supply Available External Static Pressure (in. wg) 6,750 1.47 1.74 2.20 2.72 3.21 7,313 1.84 2.09 2.52 3.07 3.62 7,875 2.27 2.51 2.89 3.45 4.05 8,438 2.76 3.00 3.35 3.87...
  • Page 80 APPENDIX C — FAN PERFORMANCE Table P — 50LC**26 — 23 Ton Horizontal Supply Available External Static Pressure (in. wg) 6,750 2.59 3.20 3.88 4.60 5.37 7,313 3.19 3.84 4.54 5.30 6.10 7,875 3.88 4.56 5.30 6.09 6.93 8,438 4.67 5.39 6.16 6.98...
  • Page 81 APPENDIX C — FAN PERFORMANCE Table Q — Pulley Adjustment Vertical MOTOR PULLEY TURNS OPEN (RPM) UNIT MOTOR/DRIVE SIZE COMBO Standard Static Medium Static High Static Ultra High Static 1113 1098 1083 1068 1053 1038 1023 1008 Standard Static Medium Static High Static Ultra High Static 1190...
  • Page 82 © Carrier Corporation 2020 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500167-01 Printed in U.S.A. Form 50LC-14-26-03SM Pg 82 2-2020 Replaces: 50LC-14-26-02SM...

  • Page 83: Start-Up Checklist

    UNIT START-UP CHECKLIST (Remove and use for 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 Service and Maintenance Instructions document.
  • Page 84 9. Open humidistat input compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____ 10. Restore set-points for thermostat and humidistat (Y/N) _____ © Carrier Corporation 2020 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

This manual is also suitable for:

Weatherexpert 50lc 17 seriesWeatherexpert 50lc 20 seriesWeatherexpert 50lc 24 seriesWeatherexpert 50lc 26 seriesWeatherexpert 50lcd024a1a5-0a0a0

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