Carrier 48VT(N) instruction

Manual background

O	T2 C C O	DFT						OF2	OF1
R	T1
W
2
Y
C	Y
SPEEDUP	P1
SPEEDUP	J1	P3	INTERVALTIMER	90	60 30	30 60	120
	DFT		OFF		QUIET SHIFT		ON
	Speedup					Quiet		Defrost interval
	Pins					Shift		DIP switches
									A08020

Fig. 23 - Defrost Control

48VT-- A

Copeland Scroll Compressor (Puron Refrigerant)

The compressor used in this product is specifically designed to operate with Puron (R-410A) refrigerant and cannot be interchanged.

The compressor is an electrical (as well as mechanical) device. Exercise extreme caution when working near compressors. Power should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards.

!WARNING

EXPLOSION HAZARD

Failure to follow this warning could result in personal injury or death and/or property damage.

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

The scroll compressor pumps refrigerant throughout the system by the interaction of a stationary and an orbiting scroll. The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The compressor is equipped with an internal pressure relief port. The pressure relief port is a safety device, designed to protect against extreme high pressure. The relief port has an operating range between 550 and 625 psi differential pressure.

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Image 31

Carrier 48VT(N) installation instructions

Contents

Installation Instructions TABLE OF CONTENTSSAFETY CONSIDERATIONS Fig. 1 - Unit 48VT-A Step 2 - Provide Unit Support RECEIVING AND INSTALLATIONINTRODUCTION Step 1 - Check Equipment 48VT--A Fig. 2 - 48VT-A24-30Unit DimensionsA09146 48VT--A Fig. 3 - 48VT-A36-60Unit DimensionsA09147 ROOF CURB DETAIL Fig. 4 - Roof Curb Dimensions48VT SMALL CURB Rigging/Lifting of Unit See Fig ACCESS PANELS MUST BE IN PLACE WHEN RIGGINGStep 5 - Rig and Place Unit Inspection Fig. 6 - Condensate Trap Step 7 - Install Flue HoodStep 8 - Install Gas Piping Step 6 - Connect Condensate Drain FIRE OR EXPLOSION HAZARD Step 9 - Install Duct ConnectionsConfiguring Units for Downflow Vertical Discharge Fig. 7 - Sediment Trap Horizontal Duct Covers Table 1 - Physical Data - Unit 48VT-AFig. 8 - Supply and Return Duct Opening 48VT--A 48VT--A Table 1 - Physical Data - Unit 48VT-ACont’dTable 2 - Maximum Gas Flow Capacity Table 3 - Heating Inputs Control Voltage Connections Step 10 - Install Electrical ConnectionsSpecial Procedures for 208-VOperation High-VoltageConnections Thermostat Balance Point Setting-Thermidistator HybridPRE-START-UP Transformer Protection Step 2 - Unit Sequence of Operation Step 3 - Start-upHeating and Make Adjust- mentsSTART-UP Step 1 - Check for Refrigerant Leaks Check Gas Input Adjust Gas InputFig. 11 - Burner Assembly Check Heating Control Airflow and Temperature Rise Limit SwitchesCheck Burner Flame Normal Operation Indoor Airflow and Airflow Adjustments Step 4 - Start-upCooling and Make Adjust- mentsRollout Switch Checking and Adjusting Refrigerant Charge 48VT--A Gas Heating Fan Speed Set-upContinuous Fan Operation Table 6 - Color Coding for Indoor Fan Motor Leads Table 7 - Filter Pressure Drop Table IN. W.C Fig. 14 - Interface Fan Board IFBTable 8 - 48VT-AWet Coil Pressure Drop 48VT--A UNIT 48VT--A Heating 48VT--A 1295 48VT--A 1445 48VT--A 1448 48VT--A 48VT A Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-A 48VT--A Fig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-AA09209 A09099 Fig. 17 - Cooling Charging Table-Subcooling48VT--A 50VT500173 REV Indoor Blower and Motor MAINTENANCECleaning the Blower Motor and Wheel Air Filter Fig. 19 - Unit Access Panels Limit SwitchInduced Draft combustion air Blower Assembly Fig. 18 - Blower Housing and Flue Collector Box Fig. 20 - Removal of Motor and Blower Wheel Electrical Controls and WiringOutdoor Fan Refrigerant Circuit Gas Input Pressure SwitchesLoss of Charge Switch High-PressureSwitchPage AccuraterMetering De vice HPS - High Pressure SwitchLCS - Loss of Charge Switch Fig. 24 - Refrigerant Circuit Synthetic Roof Precautionary Procedure TROUBLESHOOTINGSTART-UPCHECKLIST UNIT OPERATION AND SAFETY HAZARD 48VT--A PURONR R-410AQUICK REFERENCE GUIDE 48VT--A SYMPTOM Table 13 - Troubleshooting Guide-LEDStatus Codes Table 12 - Troubleshooting Guide-Heating48VT--A PRESSURES Remove and Store in Job FilesI. PRELIMINARY INFORMATION MODEL NO TEMPERATURES Replaces 48VT---04SI 48VT--ACatalog No 48VT---05SI Edition Date 04/09