Carrier 48VT(N) Roof Curb Dimensions, Small Curb, Roof Curb Detail, Large Curb

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SMALL CURB

			HVAC unit
HVAC unit			HVAC unit
base rails			basepan

Sealing

Gasket

Roofcurb

B

C

F

Anchor screw

Flashing field supplied

Roofing material field supplied

Cant strip field supplied

Wood nailer*

Roofcurb*

Insulation

(field supplied)

A

E

D

SMALL CURB

A09110

-- A

*Provided with roofcurb

A09090

ROOF CURB DETAIL

B

C

F

A

E

D

		LARGE CURB			A09095
								A09111

	UNIT SIZE	CATALOG	A	B	C	D	E	F
	UNIT SIZE	NUMBER	IN. (mm)	IN. (mm)*	IN. (mm)	IN. (mm)	IN. (mm)	IN. (mm)
		NUMBER	IN. (mm)	IN. (mm)*	IN. (mm)	IN. (mm)	IN. (mm)	IN. (mm)

	Small	CPRFCURB010A00	11 (279)	10 (254)			32.4 (822)

		CPRFCURB011A00	14 (356)		16 (406)	47.8 (1214)		2.7 (69)
		CPRFCURB011A00	14 (356)

	Large	CPRFCURB012A00	11 (279)	14 (356)			43.9 (1116)
		CPRFCURB012A00	11 (279)

		CPRFCURB013A00	14 (356)
		CPRFCURB013A00	14 (356)

NOTES:

1. Roof curb must be set up for unit being installed.

2. Seal strip must be applied, as required, to unit being installed.

3. Roof curb is made of 16-gauge steel.

4. Attach ductwork to curb (flanges of duct rest on curb).

5. Insulated panels: 1-in. (25.4 mm) thick fiberglass 1 lb. density.

IMPORTANT: Do not install large base pan HYBRID HEAT	literature dimensional drawing to ensure that “Y” is greater than 14
units onto the small base pan (common curb). The center of gravity	in. (356 mm). Do not install any large base pan unit onto the
on a large base pan HYBRID HEAT unit could overhang the curb	common curb with a “Y” dimension (center of gravity) less than 14
causing an unsafe condition. Before installing any large base pan	in. (356 mm).

unit onto the common curb, check the “Y” distance in the product

Fig. 4 - Roof Curb Dimensions

5

48VT

Image 5

Contents SAFETY CONSIDERATIONS TABLE OF CONTENTSFig. 1 - Unit 48VT-A Installation InstructionsINTRODUCTION RECEIVING AND INSTALLATIONStep 1 - Check Equipment Step 2 - Provide Unit SupportA09146 Fig. 2 - 48VT-A24-30Unit Dimensions48VT--A A09147 Fig. 3 - 48VT-A36-60Unit Dimensions48VT--A 48VT Fig. 4 - Roof Curb DimensionsSMALL CURB ROOF CURB DETAILStep 5 - Rig and Place Unit ACCESS PANELS MUST BE IN PLACE WHEN RIGGINGInspection Rigging/Lifting of Unit See FigStep 8 - Install Gas Piping Step 7 - Install Flue HoodStep 6 - Connect Condensate Drain Fig. 6 - Condensate TrapConfiguring Units for Downflow Vertical Discharge Step 9 - Install Duct ConnectionsFig. 7 - Sediment Trap FIRE OR EXPLOSION HAZARDFig. 8 - Supply and Return Duct Opening Table 1 - Physical Data - Unit 48VT-A48VT--A Horizontal Duct CoversTable 2 - Maximum Gas Flow Capacity Table 1 - Physical Data - Unit 48VT-ACont’dTable 3 - Heating Inputs 48VT--ASpecial Procedures for 208-VOperation Step 10 - Install Electrical ConnectionsHigh-VoltageConnections Control Voltage ConnectionsPRE-START-UP Balance Point Setting-Thermidistator HybridTransformer Protection ThermostatSTART-UP Step 3 - Start-upHeating and Make Adjust- mentsStep 1 - Check for Refrigerant Leaks Step 2 - Unit Sequence of OperationFig. 11 - Burner Assembly Adjust Gas InputCheck Heating Control Check Gas InputCheck Burner Flame Limit SwitchesNormal Operation Airflow and Temperature RiseRollout Switch Step 4 - Start-upCooling and Make Adjust- mentsChecking and Adjusting Refrigerant Charge Indoor Airflow and Airflow AdjustmentsContinuous Fan Operation Gas Heating Fan Speed Set-upTable 6 - Color Coding for Indoor Fan Motor Leads 48VT--ATable 8 - 48VT-AWet Coil Pressure Drop Fig. 14 - Interface Fan Board IFB48VT--A Table 7 - Filter Pressure Drop Table IN. W.CUNIT 48VT--AHeating 48VT--A1295 48VT--A1445 48VT--A1448 48VT--A48VT A Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-AA09209 Fig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-A48VT--A 48VT--A Fig. 17 - Cooling Charging Table-Subcooling50VT500173 REV A09099Cleaning the Blower Motor and Wheel MAINTENANCEAir Filter Indoor Blower and MotorInduced Draft combustion air Blower Assembly Limit SwitchFig. 18 - Blower Housing and Flue Collector Box Fig. 19 - Unit Access PanelsOutdoor Fan Electrical Controls and WiringRefrigerant Circuit Fig. 20 - Removal of Motor and Blower WheelLoss of Charge Switch Pressure SwitchesHigh-PressureSwitch Gas InputPage LCS - Loss of Charge Switch HPS - High Pressure SwitchFig. 24 - Refrigerant Circuit AccuraterMetering De viceSTART-UPCHECKLIST TROUBLESHOOTINGUNIT OPERATION AND SAFETY HAZARD Synthetic Roof Precautionary Procedure48VT--A PURONR R-410AQUICK REFERENCE GUIDE48VT--A SYMPTOM48VT--A Table 12 - Troubleshooting Guide-HeatingTable 13 - Troubleshooting Guide-LEDStatus Codes I. PRELIMINARY INFORMATION MODEL NO Remove and Store in Job FilesTEMPERATURES PRESSURESCatalog No 48VT---05SI 48VT--AEdition Date 04/09 Replaces 48VT---04SI