Carrier WeatherExpert 50LC 07 Series Service And Maintenance Instructions
  1. Manuals
  2. Brands
  3. Carrier Manuals
  4. Air Conditioner
  5. 50LC 07
  6. Service and maintenance instructions
Carrier WeatherExpert 50LC 07 Series Service And Maintenance Instructions

Carrier WeatherExpert 50LC 07 Series Service And Maintenance Instructions

Single package rooftop
Hide thumbs Also See for WeatherExpert 50LC 07 Series:
Table of Contents

Advertisement

Quick Links

Download this manual
Service and Maintenance Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
UNIT ARRANGEMENT AND ACCESS. . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Seasonal Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 2
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 3
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . . 3
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . . 7
Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Condenser-Fan Location. . . . . . . . . . . . . . . . . . . . . . . 7
Troubleshooting Cooling System. . . . . . . . . . . . . . . . 8
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . . 9
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . 12
Weatherproof Cover Installation. . . . . . . . . . . . . . . . 13
Types of Convenience Outlets . . . . . . . . . . . . . . . . . 13
SMOKE DETECTORS. . . . . . . . . . . . . . . . . . . . . . . . . 14
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 14
Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . 17
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 19
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . 19
Supply (Indoor) Fan Motor Protection . . . . . . . . . . . 20
Condenser Fan Motor Protection . . . . . . . . . . . . . . . 20
Control Circuit, 24-v. . . . . . . . . . . . . . . . . . . . . . . . . . 20
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . 20
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Low-Voltage Control Connections . . . . . . . . . . . . . . 21
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . 23
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . . 23
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500166-01
Printed in U.S.A.
Form 50LC-7-12-03SM
WeatherExpert
Electric Cooling with Optional Electric Heat
with Puron
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .23
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Refrigerant Service Ports. . . . . . . . . . . . . . . . . . . . . .23
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
To Shut Off Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Ventilation (Continuous Fan). . . . . . . . . . . . . . . . . . . 23
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . .23
RTU Open Control System. . . . . . . . . . . . . . . . . . . . .25
SystemVu™ (Factory Option) . . . . . . . . . . . . . . . . . .25
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . . 28
Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
FASTENER TORQUE VALUES. . . . . . . . . . . . . . . . . .54
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .55
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .56
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . .58
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . .67
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 litera-
ture, tags and labels attached to the unit, and other safety precau-
tions that may apply.
Follow all safety codes, including ANSI (American National Stan-
dards Institute) Z223.1. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol
. When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
Pg 1
50LC**07-12
®
Single Package Rooftop
(R-410A) Refrigerant
®
1-2020
Replaces: 50LC-7-12-02SM

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the WeatherExpert 50LC 07 Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Carrier WeatherExpert 50LC 07 Series

Summary of Contents for Carrier WeatherExpert 50LC 07 Series

  • Page 1: Table Of Contents

    WeatherExpert 50LC**07-12 ® Single Package Rooftop Electric Cooling with Optional Electric Heat with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions TABLE OF CONTENTS Compressor Mounting ......23 Internal Wiring.

  • Page 2: Unit Arrangement And Access

    WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Before performing service or maintenance operations on unit, LOCKOUT/TAGOUT the main power switch to unit. Electri- cal shock and rotating equipment could cause severe injury. BLOWER ACCESS PANEL...

  • Page 3: Supply Fan (Blower) Section

    RETURN AIR FILTERS placing the frame in its track, rotating the retainer back down and tighten all screws. Return air filters are disposable fiberglass media type. Access to the filters is through the small lift-out panel located on the rear side of the unit, above the evaporator/return air access panel.
  • Page 4 NOTE: Without the spring-tension tool, place a straight edge Loosen belt by loosening fan motor mounting nuts. (See across the belt surface at the pulleys, then deflect the belt at mid- Fig. 5.) span using one finger to a -in. deflection. Loosen movable pulley flange setscrew.

  • Page 5: Cooling

    This cleaner is avail- sheets and coil headers. able from Carrier Replacement parts division as part number Hold garden sprayer nozzle close to finned areas and apply P902-0301 for a one gallon container, and part number P902-0305 cleaner with a vertical, up-and-down motion.

  • Page 6: Refrigerant System Pressure Access Ports

    11. Thoroughly rinse all surfaces with low velocity clean water The brass fittings are two-piece High Flow valves, with a recepta- cle base brazed to the tubing and an integral spring-closed check using downward rinsing motion of water spray nozzle. Pro- valve core screwed into the base.

  • Page 7: Puron® (R-410A) Refrigerant

    Amount of refrigerant charge is listed on the unit’s nameplate. Re- On 3-phase units with scroll compressors, it is important to be cer- fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec- tain compressor is rotating in the proper direction.

  • Page 8: Troubleshooting Cooling System

    Troubleshooting Cooling System Refer to Table 1 for additional troubleshooting topics. CONDUIT 0.14 in. + 0.0 / -0.03 Fig. 9 — Condenser Fan Adjustment 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.

  • Page 9: Cooling Charging Charts

    COOLING CHARGING CHARTS 6 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 / Hum idi-MiZer Standard Unit Rem ove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa]...
  • Page 10 7.5 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 / Hum idi-MiZer Standard Unit Remove charge if below curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 48LC500413...
  • Page 11 8.5 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 Add charge if above the curve Standard Unit w / Hum idi-MiZer Rem ove charge if below the curve 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 48LC500414...

  • Page 12: Convenience Outlets

    10 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 Add charge if above the curve Rem ove charge if below the curve Standard Unit w / Hum idi-MiZer 1050 1350 1650 1950 2250 2550 2850 3150 3450 3750 4050 4350 Compressor Discharge Pressure, [psig / Kpa] 48LC500415...

  • Page 13: Weatherproof Cover Installation

    The primary leads to the convenience outlet transformer are not Weatherproof Cover Installation factory-connected. Selection of primary power source is a custom- A weatherproof while-in-use cover for the factory-installed conve- er option. If local codes permit, the transformer primary leads can nience outlets is now required by UL standards.

  • Page 14: Smoke Detectors

    Alarm and Dirty) and a manual test/reset button (on the left-side of SMOKE DETECTORS the housing). Smoke detectors are available as factory-installed options on Air is introduced to the duct smoke detector sensor’s sensing 50LC models. Smoke detectors may be specified for supply air chamber through a sampling tube that extends into the HVAC duct only, for return air without or with economizer, or in combination and is directed back into the ventilation system through a (shorter)

  • Page 15: Completing Installation Of Return Air Smoke

    RETURN AIR SMOKE DETECTOR SAMPLING TUBE SENSOR Fig. 19 — Typical Supply Air Smoke Detector Sensor Fig. 21 — Return Air Sampling Tube Location Location Completing Installation of Return Air Smoke RETURN AIR WITHOUT ECONOMIZER Sensor The sampling tube is located across the return air opening on the unit basepan.

  • Page 16: Fiop Smoke Detector Wiring And Response

    HIGHLIGHT A JMP 3 is factory-cut, transferring unit control to smoke detector. HIGHLIGHT B Smoke detector NC contact set will open on smoke alarm condi- tion, de-energizing the ORN conductor. HIGHLIGHT C 24-v power signal via ORN lead is removed at Smoke Detector in- put on LCTB;...

  • Page 17: Sensor And Controller Tests

    Sensor and Controller Tests IMPORTANT: Failure to follow this caution may result in SENSOR ALARM TEST personnel and authority concern. The sensor alarm test checks a sensor’s ability to signal an alarm Holding the test magnet against the sensor housing for state.

  • Page 18: Indicators

    Reset the sensor by turning the key switch to the RESET/ TEST position for two seconds. IMPORTANT: Failure to follow this caution may result in Verify that the test/reset station’s Alarm LED turns off. personnel and authority concern. If the smoke detector is connected to a fire alarm system, REMOTE TEST/RESET STATION DIRTY SENSOR TEST first notify the proper authorities that the detector is under- going maintenance then disable the relevant circuit to avoid...

  • Page 19: Resetting Alarm And Trouble Condition Trips

    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 20: Supply (Indoor) Fan Motor Protection

    LOW PRESSURE SWITCH Control Circuit, 24-v Each system is protected against a loss of charge and low evapora- The control circuit is protected against overcurrent conditions by a tor coil loading condition by a low pressure switch located on the circuit breaker mounted on control transformer TRAN.

  • Page 21: Single Point Boxes And Supplementary Fuses

    On 50LC units, all fuses are 60-A. Single point boxes containing fuses for 208/230-v applications use UL Class RK5 250-v fuses (Bussman FRNR 60 or Shawmut TR 60R). Single point boxes for 460-v and 575-v applications use UL Class T 600-v fuses (Bussman JJS 60 or Shawmut A6T 60).

  • Page 22: Pre-Start-Up

    PRE-START-UP CONTL WARNING BOARD PERSONAL INJURY HAZARD Failure to follow this warning could result in personal injury or death. Follow recognized safety practices and wear approved Personal Protective Equipment (PPE), including safety glasses and gloves when checking or servicing refrigerant system.

  • Page 23: Start-Up, General

    Compressor Rotation On 3-phase units with scroll compressors, it is important to be cer- WARNING tain compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the proper direction: PERSONAL INJURY AND ENVIRONMENTAL HAZARD 1.
  • Page 24 Install conduit between disconnect and control box. THERMOSTAT Install power lines to terminal connections as shown in Install a Carrier-approved accessory thermostat according to in- Fig. 36. stallation instructions included with the accessory. For complete economizer function and 3 stage compressor operation, select a...

  • Page 25: Rtu Open Control System

    not available, use a 2-stage cooling thermostat instead, but note RACEWAY that this will limit cooling to just 2 stages. When electric heat is in- stalled in the 50LC unit, the thermostat must be capable of ener- gizing the G terminal (to energize the Indoor Fan Contactor) whenever there is a space call for heat (energizing the W1 termi- nal).

  • Page 26: 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 27 General to the minimum position. If the mixed-air temperature continues The Carrier Integrated Staging Control (ISC) is intended for use to fall, the outdoor-air damper will close. Control returns to nor- with a standard thermostat or direct digital control (DDC) capable mal once the mixed-air temperature rises above 48°F (9°C).

  • Page 28: Economi$Er® X (Factory Option)

    interface for the system. The W7220 economizer module provides Table 7 — Low Ambient Temperature Outdoor Fan the basic inputs and outputs to provide simple economizer control. Control When used with the optional sensors, the economizer module pro- vides more advanced economizer functionality. OUTDOOR S-Bus Enthalpy Control Sensors 50LC...
  • Page 29 24 vac power supply Table 8 — Economizer Module 20 to 30 vac 50/60Hz; 100 VA Class 2 transformer. (Left Hand Terminal Blocks) OUTPUTS LABEL TYPE DESCRIPTION Actuator Signal Top Left Terminal Block 2 to 10 vdc; minimum actuator impedance is 2k ohm; bus two- 20k NTC Mixed Air Temperature Sensor (Polarity wire output for bus communicating actuators.
  • Page 30 SENSOR (HOT) BLACK YELLOW ANALOG BROWN – ORANGE GREEN SWITCH POWER SUPPLY. PROVIDE DISCONNECT LABEL MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 45 — CO Sensor Wiring SWITCHES INTERFACE OVERVIEW This section describes how to use the EconoMi$er X user inter- ®...
  • Page 31 To use the keypad when working with Setpoints, System and Ad- • SYSTEM SETUP vanced Settings, Checkout tests and Alarms: • ADVANCED SETUP Navigate to the desired menu. • CHECKOUT Press the (Enter) button to display the first item in the •...
  • Page 32 Table 12 — 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 33 Table 12 — 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 34 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † EXHAUST FAN STAGE 2 SETPOINT Set point for OA damper position when exhaust fan 2 is powered 0 to 100%; by the economizer.
  • Page 35 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † SUPPLY AIR TEMPERATURE CALIBRATION MAT T CAL 0.0°F ± 2.5°F Allows for the operator to adjust for an out of calibration temperature sensor.
  • Page 36 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DAMPER CALIBRATION ROUTINE RUNNING If DCV Auto enable has been programmed, this alarm will display when the W7220 is completing a calibration on the dampers. DMP CAL RUNNING Wait until the calibration is completed and the alarm will go away.
  • Page 37 Table 14 — 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 38 Table 17 — 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 39 Table 19 — 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 40 Table 21 — 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 41 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 47 — Single Enthalpy Curve Boundaries Table 23 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 42: Staged Air Volume (Sav™) With Variable Frequency

    If one or more alarms are present and there has been no keypad ac- tivity 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 43: 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 44 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 45 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. 57 — Keypad with Power Up Screen Displayed To program the VFD for 3 discreet indoor fan motor speeds 1.
  • Page 46 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 47 d. Press ▼ (Down Arrow) until the following display select the number provided in Tables 24-27. Press OK appears: again to set the selected value. 7. Setting References: a. Press the Menu key to move the ▼ (triangle icon) so 1—6* Load Depen.
  • Page 48 8. Setting the Ramp Time: NOTE: Press OK to highlight the % value and then use the ▲ and ▼ (Up and Down Arrow) keys to enter the required value. See a. Press the Back key until the following display Tables 24-27 for proper selection of the value for this parameter, appears: then press OK to set the selected value.
  • Page 49 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 50 MOTOR MOTOR CURRENT NOMINAL FREQUENCY SETTINGS TYPE POWER VOLTAGE (MUST-HOLD SPEED (Hz) AMPS) (RPM) Motor VFD Carrier Option Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Mfr P/N 208/203 HD56FR233 HK30WA370 131L9795 [102] 1695 HD56FR463 HK30WA376 131L9863 [122]...
  • Page 51 MOTOR MOTOR CURRENT NOMINAL FREQUENCY SETTINGS TYPE POWER VOLTAGE (MUST-HOLD SPEED (Hz) AMPS) (RPM) Motor VFD Carrier Option Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Mfr P/N 208/203 HD56FR233 HK30WA370 131L9795 [102] 1695 HD56FR463 HK30WA376 131L9863 [122]...
  • Page 52 MOTOR MOTOR CURRENT NOMINAL FREQUENCY SETTINGS TYPE POWER VOLTAGE (MUST-HOLD SPEED (Hz) AMPS) (RPM) Motor VFD Carrier Option Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Mfr P/N 208/203 HD56FR233 HK30WA370 131L9795 [102] 1695 HD56FR463 HK30WA376 131L9863 [122]...
  • Page 53 MOTOR MOTOR CURRENT NOMINAL FREQUENCY SETTINGS TYPE POWER VOLTAGE (MUST-HOLD SPEED (Hz) AMPS) (RPM) Motor VFD Carrier Option Voltage Motor P/N 0-03 0-06 1-20 1-22 1-23 1-24 1-25 Mfr P/N 208/203 HD56FE653 HK30WA371 131L9796 [102] [10] 1680 HD56FE653 HK30WA377 131L9864...

  • Page 54: Fastener Torque Values

    FASTENER TORQUE VALUES See Table 28 for torque values. Table 28 — Torque Values LOCATION TORQUE VALUES Supply fan motor mounting 120 ± 12 in-lb 13.5 ± 1.4 Nm Supply fan motor adjustment plate 120 ± 12 in-lb 13.5 ± 1.4 Nm Motor pulley setscrew 72 ±...

  • Page 55: 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/Heating 0 = Standard Packaged Rooftop 1 = LTL Model Series - WeatherExpert Electrical Options ®...

  • Page 56: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table A — 50LC**07-12 Physical Data (6 ton 10 Tons) 50LC*007 50LC*008 50LC*009 50LC*012 REFRIGERATION SYSTEM # Circuits / # Comp. / Type 1/2/Scroll 1/2/Scroll 1/2/Scroll 1/2/Scroll RTPF models R-410A charge A/B (lbs - oz) 15 - 8 22 - 5 25-11...
  • Page 57 APPENDIX B — PHYSICAL DATA Table A — 50LC**07-12 Physical Data (6 ton 10 Tons) (cont) 50LC*007 50LC*008 50LC*009 50LC*012 CONDENSOR COIL 2 Material — — Cu / Al Cu / Al Coil type — — -in. RTPF -in. RTPF Coil length (in.) —...

  • Page 58: Appendix C - Fan Performance

    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 59 APPENDIX C — FAN DATA Table B — 50LC**07 Horizontal Supply (6 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.19 0.30 0.42 0.55 0.69 1800 0.22 0.33 0.46 0.60 0.75 1950 0.26 0.38 0.51 0.65 0.80 2100 0.31 0.43 0.56 0.71 0.87 2250...
  • Page 60 APPENDIX C — FAN DATA Table D — 50LC**08 Horizontal Supply (7.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.21 0.41 0.65 0.91 1.18 2250 0.24 0.44 0.69 0.95 1.24 2438 0.27 0.48 0.73 1.00 1.30 2625 0.30 0.51 0.77 1.05 1.36 2813...
  • Page 61 APPENDIX C — FAN DATA Table E — 50LC**08 Vertical Supply (7.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.23 0.44 0.68 0.93 1.19 2250 0.25 0.48 0.73 0.99 1.27 2438 0.28 0.51 0.77 1.05 1.34 2625 0.32 0.56 0.83 1.12 1.42 2813...
  • Page 62 APPENDIX C — FAN DATA Table F — 50LC**09 Horizontal Supply (8.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.25 0.46 0.71 0.98 1.28 2550 0.29 0.50 0.76 1.04 1.34 2763 0.33 0.55 0.81 1.10 1.42 2975 0.38 0.60 0.87 1.17 1.49 3188...
  • Page 63 APPENDIX C — FAN DATA Table G — 50LC**09 Vertical Supply (8.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.27 0.50 0.76 1.03 1.31 2550 0.31 0.54 0.81 1.10 1.40 2763 0.35 0.59 0.87 1.17 1.49 2975 0.40 0.65 0.94 1.25 1.58 3188...
  • Page 64 APPENDIX C — FAN DATA Table H — 50LC**12 Horizontal Supply (10 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.34 0.55 0.82 1.11 1.42 3000 0.40 0.62 0.88 1.19 1.51 3250 0.46 0.69 0.96 1.27 1.61 3500 0.54 0.77 1.04 1.36 1.70 3750...
  • Page 65 APPENDIX C — FAN DATA Table I — 50LC**12 Vertical Supply (10 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.36 0.60 0.88 1.18 1.50 3000 0.42 0.66 0.96 1.27 1.61 3250 0.48 0.74 1.04 1.37 1.72 3500 0.56 0.82 1.13 1.47 1.83 3750...
  • Page 66 APPENDIX C — FAN DATA Table J — Pulley Adjustment MOTOR PULLEY TURNS OPEN MOTOR/DRIVE 50LC UNIT COMBO Standard Static — — 3 phase Medium Static — — High Static — — 1054 1022 — — Standard Static — — Medium Static —...

  • Page 67: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS Table K — Wiring Diagrams CONTROL POWER SIZE VOLTAGE ELECTRO-MECH. ELECTRO-MECH. RTU OPEN SYSTEMVU SYSTEMVU AND RTU OPEN 208/230 48LC500460 - E 48LC500465 - E 48LC500543 - D 48LC500462 - E 48LC500547 - E 50LC**07 (page 68) (page 69) (page 70)
  • Page 68 APPENDIX D — WIRING DIAGRAMS Fig. B — 50LC**07 Control Wiring Diagram...
  • Page 69 APPENDIX D — WIRING DIAGRAMS Fig. C — 50LC**07 RTU Open Control Wiring Diagram...
  • Page 70 APPENDIX D — WIRING DIAGRAMS Fig. D — 50LC**07 SystemVu Control Wiring Diagram...
  • Page 71 APPENDIX D — WIRING DIAGRAMS Fig. E — 50LC**08-12 Control Wiring Diagram...
  • Page 72 APPENDIX D — WIRING DIAGRAMS Fig. F — 50LC**08-12 RTU Open Control Wiring Diagram...
  • Page 73 APPENDIX D — WIRING DIAGRAMS Fig. G — 50LC**08-12 SystemVu Control Wiring Diagram...
  • Page 74 APPENDIX D — WIRING DIAGRAMS Fig. H — 50LC**07 Power Wiring Diagram...
  • Page 75 APPENDIX D — WIRING DIAGRAMS Fig. I — 50LC**07 SystemVu Power Wiring Diagram...
  • Page 76 APPENDIX D — WIRING DIAGRAMS Fig. J — 50LC**08-12 Power Wiring Diagram (208/230-3-60 Unit Shown)
  • Page 77 APPENDIX D — WIRING DIAGRAMS Fig. K — 50LC**08-12 Power Wiring Diagram (460-3-60, 575-3-60 Units Shown)
  • Page 78 APPENDIX D — WIRING DIAGRAMS Fig. L — 50LC**08-12 SystemVu Power Wiring Diagram (208/230-3-60 Unit Shown)
  • Page 79 APPENDIX D — WIRING DIAGRAMS Fig. M — 50LC**08-12 SystemVu Power Wiring Diagram (460-3-60, 575-3-60 Units Shown)
  • Page 82 © 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. 04-53500166-01 Printed in U.S.A. Form 50LC-7-12-03SM Pg 82 1-2020 Replaces: 50LC-7-12-02SM...

  • Page 83: Start-Up Checklist

    START-UP CHECKLIST FOR 50LC 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 84 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. 04-53500166-01 Printed in U.S.A.

This manual is also suitable for:

Weatherexpert 50lc 08 seriesWeatherexpert 50lc 09 seriesWeatherexpert 50lc 12 series

Table of Contents