Carrier 50CR installation instructions Installation Instructions, Table of Contents

50CR

Infinityt Single-Packaged Heat Pump Units With Puron→ (R-410A) Refrigerant

Sizes 024-060

Installation Instructions

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	. . . . . . 2
INTRODUCTION	. . . . . . 2
RECEIVING AND INSTALLATION	. . . 2-16
Check Equipment	. . . . . . 2
Identify Unit	. . . . . . 2
Inspect Shipment	. . . . . . 2
Provide Unit Support	. . . . . . 2
Roof Curb	. . . . . . 2
Slab Mount	. . . . . . 2
Ground Mount	. . . . . . 2
Provide Clearances	. . . . . . 2
Rig and Place Unit	. . . . . . 7
Inspection	. . . . . . 7
Introduction	. . . . . . 7
Use of Rigging Bracket	. . . . . . 7
Select and Install Ductwork	. . . . . . 9
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units	. . . . . . 9
Provide for Condensate Disposal	. . . . . . 9
Install Electrical Connections	. . . . . 11
High-Voltage Connections	. . . . . 11
Routing Power Leads Into Unit	. . . . . 11
Connecting Ground Lead to Ground Screw	. . . . . 11
Routing Control Wires	. . . . . 11
Accessory Installation	. . . . . 16
Special Procedures for 208-v Operation	. . . . . 16
PRE-START-UP	. . . . . 17
START-UP	. . . . . 17
Unit Start-Up	. . 17-23
Sequence of Operation	. . . . . 20
Check for Refrigerant Leaks	. . . . . 20
Start-Up Adjustments	. . . . . 20
Checking Cooling and Heating Control Operation	. . . . . 20
Checking and Adjusting Refrigerant Charge	. . . . . 22
Refrigerant Charge	. . . . . 22
No Charge	. . . . . 22
Low Charge Cooling	. . . . . 22
To Use Cooling Charging Charts	. . . . . 22
Indoor Airflow and Airflow Adjustments	. . . . . 22
Defrost Control	. . . . . 22
Quiet Shift	. . . . . 22
Defrost	. . . . . 22
Emergency Heat/Cool Mode	. . . . . 22

A05307

Fig. 1 - Unit 50CR

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-28 Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Outdoor Coil, Indoor Coil, and Condensate Drain Pan . . . . 25 Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . 26 Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Metering Devices–TXV & AccuRater→ Piston . . . . . . . . . . 26 Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Loss-of-Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 High-Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Copeland Scroll Compressor (Puron→ Refrigerant) . . . . . . . 27 Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Servicing Systems on Roofs with Synthetic Materials . . . 27 Liquid-Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 28 Puron (R-410A) Refrigerant Charging . . . . . . . . . . . . . . 28

System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Loss-of-Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . 28 Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . 28 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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