Specifications

JOHNSON CONTROLS

FORM ET102.19-NOM1 (809)

2. Calculate deection (Deection = Span ÷ 64)

3. See Table 6 for correct deection force.

4. Using a spring scale, apply force at right angle to

the midpoint of the belt span (see Fig. 13).

5. Check the tension at least twice during the rst day

of operation, and periodically there after.

How to Increase Belt Life

• Keep sheaves and belts clean. Abrasive dust, rust,

oils, and acids reduce service life.

• Give drives clearance. Never let belts run against

belt guards or other obstructions.

• Never force belts. Move motor on adjustment

base so belts go on easily.

• Eliminate slack. Adjust motor and tighten belts

in position. Slack belts wear excessively which

cause slippage and deliver less air.

• Use matched belts. Matched belts run smoother

and last longer because the load is evenly distrib-

uted. Never partially replace a set of belts.

• Mount belts straight. Shaft must be parallel and

sheave grooves in alignment to prevent unneces-

sary belt wear.

• Do not overload belt. Belts have a specic HP

rating that must not be exceeded.

Coils

The frequency of required cleaning is dependent on the

operating hours of the system, lter maintenance and

efciency as well as dirt load.

IMPORTANT: Coils may become ex-

ternally fouled as result of normal op-

eration. Dirt on the surface of the coil

reduces its ability to transfer heat that

can result in reduced performance,

and increased operating energy costs.

If the dirt on the surface of the coil

becomes wet, which commonly occurs

with cooling coils, microbial growth

(mold) can result, in turn causing

unpleasant odors and serious health