Carrier 42C,V Manual de instalación descargar pdf (Pagina 77)

Step 4 — Make Duct Connections — Install all

ductwork to and from unit in accordance with project plans,

specifications, and all applicable codes. Duct construction must

allow unit to operate within duct external static pressure limits

as shown on job submittals. Units designed to operate with

ductwork may be damaged if operated without intended duct-

work attached.

Units provided with outside air should have some method

of low-temperature protection to prevent freeze-up. This pro-

tection may be any of several methods, such as a low tempera-

ture thermostat to close the outside air damper or a preheat coil

to temper the outside air before it reaches the unit. It should be

noted that none of these methods will adequately protect the

coil in the event of power failure. The safest method of freeze

protection is to use glycol in the proper percent solution for the

coldest expected air temperature.

Insulate ductwork as required. Use flexible connections to

minimize duct-to-unit alignment problems and noise transmis-

sion where specified.

Set unit markings for minimum clearance to combustible

materials and first 3 ft of ductwork. Install ductwork, accessory

grilles and plenums so that they do not restrict access to filter.

The manufacturer assumes no responsibility for undesirable

system operation due to improper system design, equipment or

component selection, and/or installation of ductwork, grilles,

and other related components.

Step 5 — Frame and Finish Unit — Models 42SG,

SH, SJ, SU and SM have factory enclosures and may be fin-

ished with normally accepted wall covering. However, drywall

secured with adhesive bonding alone is not recommended.

The 42S units are designed to have gypsum board or other

types of wall board applied directly to the unit cabinet surface

to a maximum combined thickness of

-inch. Use low-pro-

file sheet metal panhead screws to secure wallboard to unit

frame. Fasteners may penetrate the cabinet no more than

inch.

These fasteners must be located to avoid damage to internal

components and wiring in the same manner as anchoring fas-

teners. Do not apply sheet metal screw or nails where they can

penetrate coil, riser pipes, or electrical junction box and race-

ways.

Do not secure wallboard to drain pan edges or to control

box enclosure. Condensate leaks or electrical shorts may result.

An alternate method of enclosing the unit is to frame one or

more sides with studding and apply the wall board to this fram-

ing. This method requires specific unit features and return ac-

cess panels when used on the return-air side of a unit. Units not

properly equipped will exhibit poor cooling and/or heating per-

formance and could experience excessive or premature compo-

nent failures.

Prevent sheetrock dust or other debris from settling on coil

fins, motor-blower assembly or other unit interior surfaces.

EXPOSED UNIT FINISH, TOUCH-UP AND

REPAINT — Return access and exposed cabinet units may be

furnished with a baked enamel finish. Small scratches in this

finish may be repaired with touch-up paint available from the

factory. Some colors of touch-up paint are available in aerosol

containers and all touch-up paint is available in pint, quart, and

gallon cans.

To repaint the factory-baked enamel, the finish should be

prepared by light sanding with no. 280 grit sand paper or

no. 000 or no. 0000 fine steel wool. The surface may also be

wiped with a liquid surface etch cleaning product such as “No

Sand” or “Pasceo.” These items should be available at most

paint product stores. It should be noted that the more conscien-

tiously this preparation is done, the more effective it will be.

After this preparation is accomplished, the factory finish

should provide excellent adhesion for a variety of air-dried top

coats. Enamel will give a more durable, higher gloss finish,

while latex will not adhere as well and will give a dull, softer

finish. Top coats involving an exothermic chemical process be-

tween two components, such as epoxies and urethanes, should

be avoided.

Factory aerosol touch-up paint may require a number of

light “dust coats” to isolate the factory-baked enamel finish

from the quick drying touch-up paint.

Step 6 — Cut Out Openings for Grilles and

Thermostats — On all units with optional supply-air or

return-air grilles, dampers, thermostats, and switch plates, cut

out openings where specified on the job plans. Be careful not to

cut wires, piping or structural supports.

For remote-mounted thermostats use a steel thermostat

shield ring to protect drywall from thermostat wiring where

applicable.

If not included on the unit or furnished from the factory,

supply and return grilles should be provided as recommended

in the product catalog.

Step 7 — Make Final Preparations

1. Turn off power to the unit (open unit electrical disconnect).

2. Install thermostats and perform any other final wiring as

applicable. Check the unit for any loose wires.

3. Perform a final visual inspection. All equipment, ple-

nums, ductwork, and piping should be inspected to verify

that all systems are complete and properly installed and

mounted, and that no debris or foreign articles such as pa-

per or drink cans are left in the units or other areas. Clean

dirt, dust, and other construction debris from unit interior.

Be sure to check fan wheel and housing.

4. Rotate fan wheel by hand to be sure it is free and does not

rub housing. Check that wing nuts securing fan assembly

to fan deck are tight.

5. Ensure all panels and filters are installed before checking

fan operation. Turn on power to the unit.

6. Install filter in frame at front of coil. If field-supplied

filters are used, be sure size is as specified in Tables 1-4.

7. ECM (Electronically Commutated) Blower:

If the unit is equipped with an ECM blower, additional

steps may be required during the air balancing process.

CAUTION

Prevent dust and debris from settling in unit. If wall finish

or color is to be spray applied, cover all openings to pre-

vent spray from entering unit. Failure to do so could result

in damage to the unit and/or the reduction of unit effi-

ciency.

CAUTION

Proper safety procedures should be followed regarding

ventilation and safety equipment during touch-up and

repainting since materials may pose a health hazard. The

manufacturer's directions should be followed for the prod-

ucts being used.

CAUTION

Do not start up or operate unit without filter. Be sure filter

and unit interior are clean. Failure to do so could result in

damage to the equipment or building and furnishings and/

or void all manufacturer's warranties.

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