1
50VT---C
Comfortt 14 SEER Single ---Packaged Heat Pump
System with Puron (R---410A) Refrigerant
S i n g l e P h a s e 2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )
T h r e e P h a s e 3 --- 5 N o m i n a l To n s ( S i z e s 3 6 --- 6 0 )
Installation Instructions
IMPORTANT: Effective January 1, 2015, 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
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 2...................................
RECEIVING AND INSTALLATION 2--9..................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 2.....................................
Provide Clearances 2.................................
Rig and Place Unit 6.................................
Inspection 6......................................
Rigging/Lifting of Unit 6............................
Select and Install Ductwork 7...........................
Configuring Units to Downflow (Vertical) Discharge 7.....
Provide for Condensate Disposal 8......................
Install Electrical Connections 8.........................
High--Voltage Connections 8.........................
Special Procedures for 208--V Operation 9...............
Control Voltage Connections 9........................
Standard Connections 9.............................
Transformer Protection 9............................
Accessory Electric Heaters Installation 9................
Sequence of Operation 9............................
PRE--START--UP 17...................................
START--UP 17--20.....................................
Checking Cooling & Heating Control Operation 17........
Check for Refrigerant Leaks 17.........................
Start--Up Adjustments 18.............................
Checking & Adjusting Refrigerant Charge 18............
Indoor Airflow & Airflow Adjustments 18..............
Continuous Fan Operation 19........................
Defrost Control 20...................................
Defrost 20.......................................
MAINTENANCE 28--33................................
Air Filter 28........................................
Indoor Blower and Motor 28...........................
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 31......
Outdoor Fan 31.....................................
Electrical Controls and Wiring 31.......................
Refrigerant Circuit 31.................................
Indoor Airflow 31...................................
Metering Devices-- TXV & Piston 31....................
A170030
Fig. 1 -- Unit 50VT--C
Pressure Switches 31.................................
Loss of Charge Switch 32.............................
High Pressure Switch 32..............................
Copeland Scroll compressor (Puron Refrigerant) 32.........
Refrigerant System 32................................
Refrigerant 32....................................
Compressor Oil 33.................................
Servicing Systems on Roofs with Synthetic Materials 33....
Liquid Line Filter Drier 33...........................
PuronR (R--410A) Refrigerant Charging 33.............
System Information 33................................
Loss of Charge Switch 33............................
Check Defrost Thermostat 33.........................
TROUBLESHOOTING 33..............................
START--UP CHECKLIST 33............................
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
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