Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500216-01 Printed in U.S.A. Form 50TCQ-8-12-01SI Pg 1 1-19 Replaces: 50TCQ-8-9-03SI, 50TCQ-12-02SI
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . 2
REFRIGERATION SYSTEM COMPONENTS . . . . . . 9
Reversing Valve and Check Valve Position . . . . . . 9
Troubleshooting Refrigerant Pressure Problems
and Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . 9
Refrigerant System Pressure Access Ports . . . . . . 9
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . 11
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . 11
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 12
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . 12
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 14
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 14
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (when required) . . . . . . . . . . . . . . . . . . 15
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 16
• ECONOMIZER AND TWO-POSITION DAMPER HOOD
PACKAGE REMOVAL AND SETUP (FACTORY
OPTION)
• ECONOMIZER HOOD AND TWO-POSITION HOOD
Step 9 — Units with Hinged Panels Only . . . . . . . . 17
Step 10 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Step 11 — Make Electrical Connections . . . . . . . . . 18
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT
• ALL UNITS
• CONVENIENCE OUTLETS
• FACTORY-OPTION THRU-BASE CONNECTIONS
• UNITS WITHOUT THRU-BASE CONNECTIONS
• ALL UNITS
• FIELD CONTROL WIRING
• THERMOSTAT
Central Terminal Board . . . . . . . . . . . . . . . . . . . . . . 26
Commercial Defrost Control . . . . . . . . . . . . . . . . . . 26
• REVERSING VALVE CONTROL
• COMPRESSOR CONTROL
• AUXILIARY (ELECTRIC) HEAT CONTROL
•DEFROST
• UNIT WITHOUT THRU-BASE CONNECTION KIT
• HEAT ANTICIPATOR SETTINGS
Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
• SINGLE POINT BOXES AND SUPPLEMENTARY
FUSES
• SINGLE POINT BOXES WITHOUT FUSES
• LOW-VOLTAGE CONTROL CONNECTIONS
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . 31
• SYSTEM COMPONENTS
• SPECIFICATIONS
•INPUTS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• ENTHALPY SETTINGS
• CHECKOUT
• TROUBLESHOOTING
PremierLink™ (Factory Option) . . . . . . . . . . . . . . . 41
RTU-Open Controller System (Factory-Installed
Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• COMPLETING INSTALLATION OF RETURN AIR
SMOKE SENSOR
• ADDITIONAL APPLICATION DATA
Step 12 — Adjust Factory-Installed Options . . . . . 42
• SMOKE DETECTORS
• ECONOMI$ER IV OCCUPANCY SWITCH
Step 13 — Install Accessories . . . . . . . . . . . . . . . . 42
Step 14 — Check Belt Tension . . . . . . . . . . . . . . . . 43
• BELT FORCE — DEFLECTION METHOD
• BELT TENSION METHOD
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . CL-1
50TCQ units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard
of 2018.
50TCQ units for installation outside the United States may or may not contain use of the SAV 2-speed indoor
fan control system, as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system, refer to the Variable Frequency
Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup and Troubleshooting manual.
WeatherMaker
®
50TCQ08-12
Single Package Rooftop with Heat Pump
with Puron
®
(R-410A) Refrigerant
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