1
50XT---A
Infinityt 15 SEER Single---Packaged Heat P ump
System With Puron
®
(R---410A) Refrigerant
Single Phase
2 t o 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )
Installation Instructions
EQUIPMENT OPERATION HAZARD
OAT sensor must be field installed. See Accessory
Installation for more details.
!
CAUTION
EQUIPMENT OPERATION HAZARD
This Infinity unit is designed for use with an Infinity User
Interface.
!
CAUTION
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2.........................
INTRODUCTION 2...................................
RECEIVING AND INSTALLATION 2--12.................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 2.....................................
Provide Clearances 6.................................
Rig and Place Unit 6.................................
Inspection 6......................................
Rigging/Lifting of Unit 6............................
Select and Install Ductwork 7...........................
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units 8..........................
Provide for Condensate Disposal 8......................
Install Electrical Connections 9.........................
High-- Voltage Connections 9.........................
Routing Power Leads Into Unit 9......................
Connecting Ground Lead to Ground Screw 9............
Routing Control Power Wires 11.....................
Accessory Installation 11............................
Special Procedures for 208--v Operation 12..............
PRE--S TART--UP 13...................................
START--UP 13--20.....................................
Unit Start--Up 13....................................
Sequence of Operation 17.............................
Check for Refrigerant Leaks 20.........................
Start-- Up Adjustments 20..............................
Checking Cooling and Heating Control Operation 20......
Checking and Adjusting Refrigerant Charge 20...........
Refrigerant Charge 20..............................
A09032
Fig. 1 -- Unit 50XT
No Charge 20.....................................
Low Charge Cooling 20.............................
To Use Cooling Charging Charts 20....................
Indoor Airflow and Airflow Adjustments 20.............
Non--Communicating Emergency Cooling/Heating Mode 20..
MAINTENANCE 22--24................................
Air Filter 23........................................
Indoor Fan and Motor 23..............................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 23.....
Outdoor Fan 23.....................................
Electrical Controls and Wiring 23.......................
Refrigerant Circuit 23.................................
Indoor Airflow 23...................................
Metering Devices–TXV & AccuRater
®
Piston 23...........
Pressure Switches 24.................................
L o s s -- o f -- C h a r g e S w i t c h 2 4............................
High--Pressure Switches 24............................
Copeland Scroll Compressor (Puron
®
Refrigerant) 24........
Refrigerant System 24................................
Refrigerant 24....................................
Compressor Oil 24.................................
Servicing Systems on Roofs with Synthetic Materials 24....
Liquid--Line Filter Drier 24..........................
Puron (R-- 410A) Refrigerant Charging 24...............
TROUBLESHOOTING 25..............................
FINAL CHECKS 26...................................
CARE AND MAINTENANCE 26........................
START--UP CHECKLIST 29............................
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