Carrier 50VT-A Provide for Condensate Disposal, Install Electrical Connections

screwed or bolted to duct flanges. Use suitable gaskets to ensure weather-tight and airtight seal.

	4.	All units must have field-supplied filters or accessory filter
		rack installed in the return-air side of the unit.
		Recommended sizes for filters are shown in Table 1.
	5.	Size all ductwork for maximum required airflow (either
		heating or cooling) for unit being installed. Avoid abrupt
		duct size increases or decreases or performance may be
		affected.
	6.	Adequately insulate and weatherproof all ductwork located
		outdoors. Insulate ducts passing through unconditioned
		space, and use vapor barrier in accordance with latest issue
		of Sheet Metal and Air Conditioning Contractors National
		Association (SMACNA) and Air Conditioning Contractors
		of America (ACCA) minimum installation standards for
		heating and air conditioning systems. Secure all ducts to
		building structure.
--A
	7.	Flash, weatherproof, and vibration-isolate all openings in
50VT		building structure in accordance with local codes and good
		building practices.

A C

MAXIMUM ALLOWABLE

BDIFFERENCE in. (mm)

	A-B	B-C			A-C
1/4	(6.35)	1/4	(6.35)	1/4	(6.35)

A07925

Fig. 7 - Unit Leveling Tolerances

OPTIONAL	OPTIONAL
RETURN	SUPPLY
AIR	AIR
OPENING	OPENING
2˝
(50.8mm)
EVAP. COIL	COND. COIL

A07926

Fig. 8 - Slab Mounting Detail

Step 6 — Provide for Condensate Disposal

NOTE: Ensure that condensate-water disposal methods comply with local codes, restrictions, and practices.

The 50VT-A units dispose of condensate through a 3/4 in. NPT female fitting that exits on the compressor end of the unit. Condensate water can be drained directly onto the roof in rooftop installations (where permitted) or onto a gravel apron in ground level installations. Install a field-supplied condensate trap at end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. (25 mm) lower than the drain-pan condensate connection to prevent the pan from overflowing. Prime the trap with water. When using a gravel apron, make sure it slopes away from the unit.

If the installation requires draining the condensate water away from the unit, install a field-supplied 2 -in. (51mm) trap at the condensate connection to ensure proper drainage. Condensate trap is available as an accessory or is field-supplied. Make sure that the outlet of the trap is at least 1 in. (25 mm) lower than the unit drain-pan condensate connection to prevent the pan from overflowing. Connect a drain tube using a minimum of field-supplied 3/4-in. PVC or field-supplied 3/4-in. copper pipe at outlet end of the 2-in. (51 mm) trap. (See Fig. 9) Do not undersize the tube. Pitch the drain tube downward at a slope of at

least 1 in. (25 mm) every 10 ft (3 m) of horizontal run. Be sure to check the drain trough for leaks. Prime the trap at the beginning of the cooling season start-up.

TRAP

OUTLET

1-in. (25 mm) min.

2-in. (51 mm) min.

A09052

Fig. 9 - Condensate Trap

Step 7 — Install Electrical Connections

!CAUTION

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution may result in damage to the unit being installed.

1.Make all electrical connections in accordance with NEC NFPA 70 (latest edition) and local electrical codes governing such wiring. In Canada, all electrical connections must be in accordance with CSA standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.

2.Use only copper conductor for connections between field-supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE.

3.Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate. On 3-phase units, ensure phases are balanced within 2 percent. Consult local power company for correction of improper voltage and/or phase imbalance.

4.Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

The unit cabinet must have an uninterrupted, unbroken electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the control compartment, or conduit approved for electrical ground when installed in accordance with NEC,NFPA 70 National Fire Protection Association (latest edition) (in Canada, Canadian Electrical Code CSA C22.1) and local electrical codes.

High-Voltage Connections

The unit must have a separate electrical service with a field-supplied, waterproof disconnect switch mounted at, or within sight from the unit. Refer to the unit rating plate, NEC and local codes for maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing.

The field-supplied disconnect may be mounted on the unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used. See Fig. 2 and 3 for acceptable location. Remove high voltage knockout.

See unit wiring label (Fig. 12-14) and Fig. 10 for reference when making high voltage connections. Proceed as follows to complete the high-voltage connections to the unit.

8