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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
Plan for Unit Location . . . . . . . . . . . . . . . 19
Plan for Sequence of Unit Installation . . 19
Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 19
Provide Unit Support . . . . . . . . . . . . . . . . 19
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
Field Fabricate Ductwork . . . . . . . . . . . . . 24
• UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC
Rig and Place Unit . . . . . . . . . . . . . . . . . . 24
Horizontal Duct Connection . . . . . . . . . . 25
Install Outside Air Hood (Factory Option) .
Assemble Barometric Hood . . . . . . . . . . . 26
• BAROMETRIC HOOD (VERTICAL CONFIGURATION)
Step 10 — Economizer – Horizontal Airflow Units
Install External Condensate Trap/Line . . . 28
Make Electrical Connections . . . . . . . . . 28
• UNITS WITHOUT FACTORY-INSTALLED NON-
• UNITS WITH FACTORY-INSTALLED NON-FUSED
• FACTORY-OPTION THRU-BASE ELECTRICAL
• UNITS WITHOUT THRU-BASE ELECTRICAL
• UNITS WITHOUT THRU-BASE CONNECTION KIT
• CONFIGURING FOR ELECTRIC HEAT
• TRANSFORMER CONNECTION FOR 208-V POWER
• HUMIDI-MIZER® SYSTEM CONTROL
RTU Open Controller (Factory-Installed Option) . .43
SystemVu Controller (Factory-Installed Option) . . .43
Integrated Staging Control (ISC) . . . . . . . . . . . . . . .44
Economi$er® X (Factory-Installed Option)
• W7220 ECONOMIZER MODULE WIRING
• ECONOMIZER CONTROL CONFIGURATIONS
• W7220 ECONOMIZER SETUP AND CONFIGURATION
• CONTROL SETPOINT AND CONFIGURATION LOG
Staged Air Volume (SAV™) with Variable Frequency
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
• MULTI-SPEED VFD DISPLAY KIT (FIELD-
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
• RETURN AIR SENSOR TUBE INSTALLATION
Install Accessories . . . . . . . . . . . . . . . . .78
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
Summary of Contents for WeatherExpert 50LC14
Page 4: ...4 Fig 2 50LC Vertical Airflow Size 14...
Page 5: ...5 Fig 3 50LC Horizontal Airflow Size 14...
Page 6: ...6 Fig 4 50LC Back View and Condensate Drain Location Size 14...
Page 7: ...7 Fig 5 50LC Corner Weights and Clearances Size 14...
Page 8: ...8 Fig 6 50LC Bottom View Size 14...
Page 9: ...9 Fig 7 50LC Vertical Airflow Sizes 17 20...
Page 10: ...10 Fig 8 50LC Horizontal Airflow Sizes 17 20...
Page 11: ...11 Fig 9 50LC Back View and Condensate Drain Location Sizes 17 20...
Page 12: ...12 Fig 10 50LC Corner Weights and Clearances Sizes 17 20...
Page 13: ...13 Fig 11 50LC Bottom View Sizes 17 20...
Page 14: ...14 Fig 12 50LC Vertical Airflow Sizes 24 26...
Page 15: ...15 Fig 13 50LC Horizontal Airflow Sizes 24 26...
Page 16: ...16 Fig 14 50LC Back View and Condensate Drain Location Sizes 24 26...
Page 17: ...17 Fig 15 50LC Corner Weights and Clearances Sizes 24 26...
Page 18: ...18 Fig 16 50LC Bottom View Sizes 24 26...
Page 21: ...21 Fig 19 Roof Curb Details 14 Size Unit...
Page 22: ...22 Fig 20 Roof Curb Details 17 and 20 Size Units...
Page 23: ...23 Fig 21 Roof Curb Details 24 and 26 Size Units...
Page 30: ...30 Fig 42 50LC 14 26 Electro Mechanical Control Wiring Diagram...
Page 31: ...31 Fig 43 50LC 14 26 RTU Open Control Wiring Diagram...
Page 32: ...32 Fig 44 50LC 14 26 SystemVu Control Wiring Diagram...
Page 35: ...35 Fig 47 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 208 230V Shown...
Page 36: ...36 Fig 48 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 460V 575V Shown...
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