Refrigerant Circuit, HPS - High Pressure Switch

48VT-- A

Fig. 24 - Refrigerant Circuit

OUTDOOR COIL

C99097

INDOOR COIL

ACCUMULATOR

COMPRESSOR

HP S

TXV in Metering

Position

LCS

LEGEND	Bypass
	Position

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater®Metering De vice

Arrow indicates direction of flow

C03011

Fig. 25 - Typical Heat Pump Operation, Cooling Mode

Page 32

Image 32

Carrier 48VT(N) Refrigerant Circuit, HPS - High Pressure Switch, LCS - Loss of Charge Switch, AccuraterMetering De vice

Contents

TABLE OF CONTENTS SAFETY CONSIDERATIONSFig. 1 - Unit 48VT-A Installation Instructions RECEIVING AND INSTALLATION INTRODUCTIONStep 1 - Check Equipment Step 2 - Provide Unit Support A09146 Fig. 2 - 48VT-A24-30Unit Dimensions48VT--A A09147 Fig. 3 - 48VT-A36-60Unit Dimensions48VT--A Fig. 4 - Roof Curb Dimensions 48VTSMALL CURB ROOF CURB DETAIL ACCESS PANELS MUST BE IN PLACE WHEN RIGGING Step 5 - Rig and Place UnitInspection Rigging/Lifting of Unit See Fig Step 7 - Install Flue Hood Step 8 - Install Gas PipingStep 6 - Connect Condensate Drain Fig. 6 - Condensate Trap Step 9 - Install Duct Connections Configuring Units for Downflow Vertical DischargeFig. 7 - Sediment Trap FIRE OR EXPLOSION HAZARD Table 1 - Physical Data - Unit 48VT-A Fig. 8 - Supply and Return Duct Opening48VT--A Horizontal Duct Covers Table 1 - Physical Data - Unit 48VT-ACont’d Table 2 - Maximum Gas Flow CapacityTable 3 - Heating Inputs 48VT--A Step 10 - Install Electrical Connections Special Procedures for 208-VOperationHigh-VoltageConnections Control Voltage Connections Balance Point Setting-Thermidistator Hybrid PRE-START-UPTransformer Protection Thermostat Step 3 - Start-upHeating and Make Adjust- ments START-UPStep 1 - Check for Refrigerant Leaks Step 2 - Unit Sequence of Operation Adjust Gas Input Fig. 11 - Burner AssemblyCheck Heating Control Check Gas Input Limit Switches Check Burner FlameNormal Operation Airflow and Temperature Rise Step 4 - Start-upCooling and Make Adjust- ments Rollout SwitchChecking and Adjusting Refrigerant Charge Indoor Airflow and Airflow Adjustments Gas Heating Fan Speed Set-up Continuous Fan OperationTable 6 - Color Coding for Indoor Fan Motor Leads 48VT--A Fig. 14 - Interface Fan Board IFB Table 8 - 48VT-AWet Coil Pressure Drop48VT--A Table 7 - Filter Pressure Drop Table IN. W.C 48VT--A UNIT 48VT--A Heating 48VT--A 1295 48VT--A 1445 48VT--A 1448 Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-A 48VT A A09209 Fig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-A48VT--A Fig. 17 - Cooling Charging Table-Subcooling 48VT--A50VT500173 REV A09099 MAINTENANCE Cleaning the Blower Motor and WheelAir Filter Indoor Blower and Motor Limit Switch Induced Draft combustion air Blower AssemblyFig. 18 - Blower Housing and Flue Collector Box Fig. 19 - Unit Access Panels Electrical Controls and Wiring Outdoor FanRefrigerant Circuit Fig. 20 - Removal of Motor and Blower Wheel Pressure Switches Loss of Charge SwitchHigh-PressureSwitch Gas InputPage HPS - High Pressure Switch LCS - Loss of Charge SwitchFig. 24 - Refrigerant Circuit AccuraterMetering De vice TROUBLESHOOTING START-UPCHECKLISTUNIT OPERATION AND SAFETY HAZARD Synthetic Roof Precautionary Procedure PURONR R-410AQUICK REFERENCE GUIDE 48VT--A SYMPTOM 48VT--A 48VT--A Table 12 - Troubleshooting Guide-HeatingTable 13 - Troubleshooting Guide-LEDStatus Codes Remove and Store in Job Files I. PRELIMINARY INFORMATION MODEL NOTEMPERATURES PRESSURES 48VT--A Catalog No 48VT---05SIEdition Date 04/09 Replaces 48VT---04SI