Specifications

ManualsBrandsYork ManualsBlower480

After the movable flange (or flanges) has been rotated to

the proper number of “turns open”, the set screws should

be tightened against the flats on the barrel to lock the nlov-

able flange in place. If the pulley includes a locking collar,

the locking collal must be loosened to adjust the setting of

t}le movable flange.

Note the fcrllowing:

1. The supply irlr CFM must be within the limitations

shown in Table 1.

2. Both movable flanges on a 2-groove pulley must be ad-

justed to the same setting (turns open) to balance the

loading on both belts.

TABLE 7 –SUPPLY

AIR SYSTEM ADJUSTMENT

MODEL

TURNS

RPM

OPENI

7-1/2 10

6 913

1025

– –

950

1062

– –

DSC300

4“

987

1099 – –

1024

1136

– –

1061

1173

– –

——.

1098

1210 – –

—

780 924 –

—

812

962 –

—

DSC360

844

1000 –

—

876

1038 –

—

908

1076 –

—

940

1114 –

—

924 –

5-- ‘-~ – –

962 –

4– 1000 –

D.-.C480

--- s– .–

..-. :—

- –:

1038 –

2“ – ‘–

1076 –

— —

1114

11892

530.25-N1

To determine the deflection distance from normal po-

sition use a straight edge from sheave to sheave as a

reference line.

The recommended deflection force is as follows:

BELT

DEFLECTION FORCE (LBS,)

SECTION

MINIMUM MAXIMUM

“B”

“c” - 11

Tension new belts at the max. deflection force recom-

mended for the belt section. Check the belt tension at

least two times during the first 24 hrs. of operation.

Any re-tensioning should fall between the min. and

max. deflection force values.

After adjusting, retighten nuts(A).

‘NEVER LOOSEN

(c)●

FIG. 15 – TYPICAL MOTOR MOUNTING ASSEMBLY

1 Pulleys can be adjusted In half turn Increments

2 F(xed pulleys, no adjustment.

5. All pulleys are factory aligned.

3. All pulleys can be adjusted in halt-tu[n increments.

4. The tension on each belt slxrll be adjusteci per the fol-

lowlng procedure. See E“lgure15.

J. Loosen two nuts ( A).

b. Adjust by turning (B).

c. Never loosen nuts (C).

d. Using:1 belt tension checker, opply a perpendicular

force to one belt ~t the rmdpomt of the span asshown

The deflectmn force should be applied until the

specified deflection distance is obtained.

The deflection distance equals 1/64” per mch of span

length.

6. All supply air motor pulleys are factory set at 2 “turns

open”.

After the pre-start check Ilst has been completed:

Start the supply air blowers.

Adjust the resistancesin both the supply and the return

duct systems to balance the air distribution throughout

the conditioned space. The job specifications may re-

quire that this balancing be done by someone other than

the equipment installer.

To check the supply air CFM after the initial balancing has

been comnleted:

1, Drill two 5/ 16“ boles ( A & B) as shown in Figure 16.

CES