Carrier 48ES Instruction Manual download pdf (Page 11)

Horizontal Duct Covers

A09061

Basepan

Downflow

(Vertical)

Supply

Knockout

Basepan

Downflow

(Vertical)

Return

Knockout

A09060

Fig. 9 -- Supply and Return Duct Opening

Adhere to the following criteria when selecting, sizing, and

installing the duct system:

1. Units are shipped for horizontal duct installation (by

removing duct covers).

2. Select and size ductwork, supply--air registers, and

return--air grilles according to American Society of Heating,

Refrigeration and Air Conditioning Engineers (ASHRAE)

recommendations.

3. Use flexible transition between rigid ductwork and unit to

prevent transmission of vibration. The transition may be

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.

7. Flash, weatherproof, and vibration isolate all openings in

building structure in accordance with local codes and good

building practices.

Step 10 — Install Electrical Connections

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 NFPA 70 (NEC) (latest

edition) (in Canada, Canadian Electrical Code CSA C22.1)

and local electrical codes.

WARNING

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 NFPA

70 (NEC) (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. Insulate low--voltage wires for highest voltage contained

within conduit when low--voltage control wires are in

same conduit as high--voltage wires.

5. Do not damage internal components when drilling

through any panel to mount electrical hardware, conduit,

etc.

CAUTION

High--Voltage Connections

When routing power leads into unit, use only copper wire between

disconnect and unit. The high voltage leads should be in a conduit

until they enter the duct panel; conduit termination at the duct

panel must be watertight.

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 switch box 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).

NOTE: Field supplied disconnect switch box should be

positioned so that it does not cover up any of the unit gas

combustion supply air louvers.

See unit wiring label (Fig. 14, 15 and 16) and Fig. 10 for reference

when making high voltage connections. Proceed as follows to

complete the high--voltage connections to the unit.

48ES-- A

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Carrier 48ES Instruction Manual Page 11

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