York W)036 THRU 060 Specifications download pdf (Page 35)

542300-YIM-A-1009

Johnson Controls Unitary Products 35

CFM Static Pressure and Power-Altitude and Temperature

Corrections

The information below should be used to assist in application of

product when being applied at altitudes at or exceeding 1000

feet above sea level.

The air flow rates listed in the standard blower performance

tables are based on standard air at sea level. As the altitude or

temperature increases, the density of air decreases. In order to

use the indoor blower tables for high altitude applications,

certain corrections are necessary.

A centrifugal fan is a “constant volume” device. This means

that, if the rpm remains constant, the CFM delivered is the

same regardless of the density of the air. However, since the air

at high altitude is less dense, less static pressure will be

generated and less power will be required than a similar

application at sea level. Air density correction factors are shown

in Table 12 and Figure 20.

Figure 20: Altitude/Temperature Correction Factors

Procedure for adjusting belt tension:

1. Loosen six nuts (top and bottom) A.

2. Adjust by turning (B).

3. Never loosen nuts (C).

4. Use belt tension checker to apply a perpendicular

force to one belt at the midpoint of the span as shown.

Deflection distance of 4mm (5/32”) is obtained.

To determine the deflection distance from normal position,

use a straight edge from sheave to sheave as reference

line. The recommended deflection force is as follows:

Tension new belts at the max. deflection force

recommended for the belt section. Check the belt

tension at least two times during the first 24 hours of

operation. Any retensioning should fall between the min.

and max. deflection force values.

5. After adjusting retighten nuts (A).

Table 12: Altitude/Temperature Correction Factors

Air

Temp.

Altitude (Ft.)

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

40 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729

50 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715

60 1.019 0.982 0.948 0.913 0.880 0.848 0.816 0.787 0.757 0.729 0.701

70 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.715 0.688

80 0.982 0.947 0.913 0.880 0.848 0.817 0.787 0.758 0.730 0.702 0.676

90 0.964 0.929 0.897 0.864 0.833 0.802 0.772 0.744 0.716 0.689 0.663

100 0.946 0.912 0.880 0.848 0.817 0.787 0.758 0.730 0.703 0.676 0.651

0.600

0.650

0.700

0.750

0.800

0.850

0.900

0.950

1.000

1.050

1.100

40 50 60 70 80 90 100

Air Temperature (ºF)

Correction Factor

Sea Level

1000 ft

2000 ft

3000 ft

4000 ft

6000 ft

7000 ft

8000 ft

9000 ft

10000 ft

5000 ft

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 57 58

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York W)036 THRU 060 Specifications Page 35

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