Trane Performance Air Handlers Manual de Instalação descarregar pdf (Página 78)

100

78 CAH-SVX01B-EN

Start-Up

Tension the Fan Belt

NOTICE

Belt Tension!

Do not over-tension belts. Excessive belt tension will reduce fan and motor bearing life,

accelerate belt wear and possibly cause shaft failure. Under tensioning belts is the primary

cause of premature belt failure. Belts should not squeal at startup. Recheck belt tension after

8 hours, 24 hours, and 100 hours of operation and monthly thereafter.

Figure 72. Tension drive belt label

Proper belt tension is required to ensure maximum bearing and

drive component life and is based on motor horsepower

requirement. A label located on the bearing support on the drive

side of the unit lists all drive parts, the proper belt tension, and

deflection for that tension for the specific drive (Figure 72).

If the drive is changed from the original, proper belt tension can be

estimated using Tab le 3.

The correct operation tension for a V-belt drive is the lowest tension

at which the belts will not slip under the peak load conditions. It may

be necessary, however, to increase the tension of some drives to

reduce excessive belt flopping or to reduce excessive startup

squealing.

V-BELT DRIVE KIT

1627373

MODULE 0400

PURCHASE ORD. NUMBER B24597-061 H5D073B A

CUSTOMER’S KIT # H5D073B A-012-0400

MTR HP.= 10.0

FAN RPM = 1458 CD = 9.4 AT 3.00 TRN OPN

TENSION INFO - 3.86 LB., 0.14 IN.

DRIVE’S BELTS - B40

MOTOR SHEAVE - 2VP75X 1 3/8

MOTOR BUSHING - NONE REQUIRED

FAN SHEAVE - 2B5V80

FAN BUSHING - B 1 7/16

Figure 73. Belt tensioner

Check the fan belt tension at least three times during the first days of

operation because there is a rapid decrease in tension until the belt settles

in. To measure belt tension, use a belt tensiometer (see Figure 73).

Determine actual deflection by depressing one belt with the belt

tensiometer and measuring the deflection relative to the other belts or to

belt line (see Figure 74). Adjust the belt tension to the correct pounds force

and tighten all set screws to the proper torque.

Figure 74. Belt tension measurement

Small O-Ring

Force Scale

Large O-Ring

Span Scale

Belt Span

Deflection =

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 99 100

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Trane Performance Air Handlers Manual de Instalação Página 78

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