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Carrier WeatherExpert 50LC14 - User Manual

Carrier WeatherExpert 50LC14
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500292-01 Printed in U.S.A. Form 50LC-14-26-06SI Pg 1 1-2021 Replaces: 50LC-14-26-05SI
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
St
ep 1 — Plan for Unit Location . . . . . . . . . . . . . . . 19
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . 19
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . 19
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 24
• UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC
HEATERS
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 24
• POSITIONING ON CURB
Step 7 — Horizontal Duct Connection . . . . . . . . . . 25
St
ep 8 — Install Outside Air Hood (Factory Option) .
25
Step 9 — Assemble Barometric Hood . . . . . . . . . . . 26
• BAROMETRIC HOOD (VERTICAL CONFIGURATION)
• BAROMETRIC HOOD (HORIZONTAL
CONFIGURATION)
Step 10 — Economizer – Horizontal Airflow Units . . 28
Step 11 — Install External Condensate Trap/Line . . . 28
Step 12 — Make Electrical Connections . . . . . . . . . 28
• FIELD POWER SUPPLY
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT OR HACR
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• ALL UNITS
• CONVENIENCE OUTLETS
• HACR AMP RATING
• FACTORY-OPTION THRU-BASE ELECTRICAL
CONNECTIONS
• UNITS WITHOUT THRU-BASE ELECTRICAL
CONNECTIONS
• FIELD CONTROL WIRING
• THERMOSTAT
• UNITS WITHOUT THRU-BASE CONNECTION KIT
• CONFIGURING FOR ELECTRIC HEAT
• HEAT ANTICIPATOR SETTINGS
• TRANSFORMER CONNECTION FOR 208-V POWER
SUPPLY
• ELECTRIC HEATERS
• HUMIDI-MIZER® SYSTEM CONTROL
CONNECTIONS
RTU Open Controller (Factory-Installed Option) . .43
SystemVu Controller (Factory-Installed Option) . . .43
Integrated Staging Control (ISC) . . . . . . . . . . . . . . .44
• SE
QUENCE OF OPERATION
Economi$er® X (Factory-Installed Option) . . . . . . .46
• UNIT INSTALLATION
• ENTHALPY SENSOR RELOCATION
• W7220 ECONOMIZER CONTROLLER
• W7220 ECONOMIZER MODULE WIRING
• ECONOMIZER CONTROL CONFIGURATIONS
• ECONOMISER HARDWARE
• OPERATING SEQUENCES
• W7220 ECONOMIZER SETUP AND CONFIGURATION
• TROUBLESHOOTING
• CONTROL SETPOINT AND CONFIGURATION LOG
Staged Air Volume (SAV™) with Variable Frequency
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
• MULTI-SPEED VFD DISPLAY KIT (FIELD-
INSTALLED ACCESSORY)
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
• RETURN AIR SENSOR TUBE INSTALLATION
• SMOKE DETECTOR TEST MAGNET
• ADDITIONAL APPLICATION DATA
Step 13 — Install Accessories . . . . . . . . . . . . . . . . .78
Step 14 — Check Belt Tension . . . . . . . . . . . . . . . . .78
• BELT FORCE: DEFLECTION METHOD
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .79
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.
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
instructions or manuals, be alert to the potential for personal
injury.
WeatherExpert
®
50LC14-26 Single Package Rooftop
Cooling Only
with Puron
®
(R-410A) Refrigerant

Table of Contents

Questions and Answers

  • M
    Megan BarreraAug 16, 2025
    Why does my Carrier WeatherExpert 50LC14 ask for a dry bulb changeover temperature when using enthalpy sensors?
    • J
      Jeff ColeAug 17, 2025
      If the humidity sensor in the enthalpy sensors fails, the backup algorithm in the control will default to the dry bulb temperature sensor in the enthalpy sensor.
  • A
    Amanda MaloneAug 19, 2025
    How long will a Carrier WeatherExpert 50LC14 Heat Pump stay in checkout mode if left without input?
    • M
      margaretdavisAug 19, 2025
      The unit will remain in checkout mode for 10 minutes, after which it will return to normal operation.
  • P
    Patrick PattersonAug 22, 2025
    How to set the minimum position on a Carrier WeatherExpert 50LC14 Heat Pump?
    • A
      Amber WhiteAug 22, 2025
      The minimum position is set using the VENTMIN and VENTMAX setup in the SETPOINTS menu. VENTMIN is the minimum ventilation required when using an occupancy sensor and VENTMAX is the minimum ventilation when not using an occupancy sensor for Demand Controlled Ventilation.
  • M
    Maxwell GalvanAug 25, 2025
    What to do if the outdoor damper closes when commanded to open on my Carrier WeatherExpert 50LC14?
    • J
      Jody ReevesAug 25, 2025
      Check the actuator linkage or rotation. In the CHECKOUT mode, the outdoor damper should drive open or closed with the return air damper having the opposite effect.
  • A
    alexander22Aug 27, 2025
    What to do if my Carrier WeatherExpert 50LC14 Heat Pump damper doesn't completely close during checkout?
    • S
      shuangAug 28, 2025
      Check the damper linkage or hub to make sure the damper is able to close completely.
  • N
    Nancy BowersAug 30, 2025
    What is a good setpoint for the Supply Air Temperature (SAT) on a Carrier WeatherExpert 50LC14 Heat Pump?
    • A
      Alexis BuchananAug 30, 2025
      The supply air temperature is the temperature of air that you want to supply to the space. In a commercial building, this is typically 50°F to 55°F (10°C to 13°C). The supply air results from the mixing of the return air and the outdoor air.
  • G
    gmaySep 2, 2025
    Does the Carrier Heat Pump economizer save program values after a power loss?
    • B
      ballenSep 2, 2025
      Yes, once the changes are stored in the controller they will be stored until they are changed by the operator.
  • J
    Jacob HickmanSep 4, 2025
    How to restore factory defaults on a Carrier Heat Pump?
    • J
      jonesanthonySep 5, 2025
      Under the SYSTEM SETUP menu you can change the setpoints to the factory defaults.
  • D
    david53Sep 8, 2025
    Is the LCD screen visible when installed in a Carrier WeatherExpert 50LC14 Heat Pump unit?
    • R
      richard10Sep 8, 2025
      The LCD screen has a backlight that is always illuminated.
  • C
    cindythompsonSep 12, 2025
    How to fix inaccurate outdoor temperature readings on my Carrier Heat Pump?
    • C
      Chad StevensSep 12, 2025
      Check the sensor wiring: * Enthalpy sensors are to be wired to the S-Bus terminals. * Temperature sensors are to be wired to the OAT and MAT terminals. See Fig. 77.

Carrier WeatherExpert 50LC14 Specifications

General IconGeneral
Model50LC14
TypeHeat Pump
Heating Capacity (HSPF)Up to 8.2
RefrigerantR-410A
Compressor TypeScroll
Sound Level74 dB
Cooling Capacity (BTU)60, 000
Heating Capacity (BTU)60, 000

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