Understanding the Accurater and Loss of Charge Switch in Carrier Heat Pump Models

ACCUMULATOR

COMPRESSOR

OUTDOOR COIL

TXV in Metering

Position

LCS

HP S

INDOOR COIL

LEGEND	Bypass
	Position

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater®Metering De vice

Arrow indicates direction of flow

Fig. 20 - Typical Heat Pump Operation, Cooling Mode

50CR

C03011

ACCUMULATOR

COMPRESSOR

OUTDOOR COIL

TXV in Bypass

Position

LCS

HP S

INDOOR COIL

Metering

Position

LEGEND

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater®Metering De vice

Arrow indicates direction of flow

Fig. 21 - Typical Heat Pump Operation, Heating Mode

21

C03012

Image 21

Carrier 50CR installation instructions Typical Heat Pump Operation, Cooling Mode

Contents

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