Installation Instruction
IMPORTANT: Effective January 1, 2023, all split system and packaged
air conditioners must be installed pursuant to applicable regional
efficiency standards issued by the Department of Energy.
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner’s Manual and Service
Instructions are left with the unit after installation.
Table of Contents
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiving and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inspect Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging/Lifting of Unit (See Fig. 5) . . . . . . . . . . . . . . . . . . . . . . 8
Configuring Units for Downflow (Vertical) Discharge . . . . . . . 8
High-Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Special Procedures for 208-V Operation . . . . . . . . . . . . . . . . . 10
Control Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Standard Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Transformer Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Accessory Electric Heaters Installation . . . . . . . . . . . . . . . . . . 10
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pre-Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Checking Cooling and Heating Control Operation. . . . . . . . . . 19
Checking and Adjusting Refrigerant Charge . . . . . . . . . . . . . . 20
Indoor Airflow and Airflow Adjustments . . . . . . . . . . . . . . . . 20
Single Cooling Fan Speed Set-up (Dehumidification feature not
used) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Two Cooling Fan Speeds Set-up (Dehumidification feature used)
20
Single Speed Cooling With Higher Electric Heat Speed . . . . . 21
Continuous Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Demand Defrost Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Servicing Systems on Roofs with Synthetic Materials. . . . . . . 29
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Puron (R-410A) Refrigerant Charging . . . . . . . . . . . . . . . . . . . 29
Loss of Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Start-Up Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
A09033
Fig. 1 – Unit 50VT-K
Safety Considerations
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. When working on this equipment, observe
precautions in the literature, on tags, and on labels attached to or shipped
with the unit and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have a fire
extinguisher available. Read these instructions thoroughly and follow all
warnings or cautions included in literature and attached to the unit.
Consult local building codes, the current editions of the National
Electrical Code (NEC) NFPA 70.
50VT-K
Comfort™ 13.4 SEER2 Single-Packaged Heat Pump
System with Puron® (R-410A) Refrigerant
Single Phase 2-5 Nominal Tons (Sizes 24-60)
Three Phase 3-5 Nominal Tons (Sizes 36-60)
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