Contents
Table of Contents
Installation Instructions
Introduction
Safety Considerations
Electrical Shock Hazard
Equipment Damage Hazard
Roof Curb for Small Cabinet Roof Curb for Large Cabinet
Unit Leveling Tolerances
50CR024-036 Unit Dimensions
50CR042-060 Unit Dimensions
Property Damage Hazard
Rig and Place Unit
Inspection
Unit Falling Hazard
Rigging Bracket Under Unit Rain Lip
Select and Install Ductwork
Electrical Operation Hazard
Provide for Condensate Disposal
Physical Data Unit 50CR
Typical Installation
HIGH-VOLTAGE Connections
Routing Power Leads Into Unit
Connecting Ground Lead to Ground Screw
Routing Control Power Wires
Electrical Data-50CR
Electrical Data Legend
Wiring Schematics-50CR Single Phase
Wiring Schematics-50CR Three Phase
Line Power Connections
Accessory Installation
PRE-START-UP FIRE, EXPLOSION, Electrical Shock Hazard
START-UP
Unit Start-Up
Verify Motor Winding Section
Status Code 45, Control Board Test Fault
Status Code 37, Heater Output Sensed on When not Energized
Status Code 44, Motor Communication Fault
Status Code 25, Invalid Motor / Model Selection
Status Code 36, Heater Output not Sensed When Energized
Status Code 41, Blower Motor Fault
Status Code 16, System Communication Fault
Start-Up Adjustments
Sequence of Operation
Check for Refrigerant Leaks
Typical Heat Pump Operation, Cooling Mode
Defrost Control
Electric Heat Pressure Drop Table Small Cabinet
Maintenance
Personal Injury and Unit Damage Hazard
Unit Operation Hazard
Outdoor Fan
Air Filter
Indoor Blower and Motor
Outdoor Coil, Indoor Coil, and Condensate Drain Pan
Pressure Switches
Indoor Airflow
Metering Devices-TXV & Accurater Piston
High-Pressure Switch
EXPLOSION, FIRE, Electrical Shock Hazard
Personal INJURY, Unit Operation Hazard
System Information
LOSS-OF-CHARGE Switch
Troubleshooting
START-UP Checklist
Observe all warnings, cautions, and bold text
Troubleshooting Chart
Head pressure too low
Troubleshooting Chart Cont’d
START-UP Checklist