York Y32, Y33, Y34 manual Altitude Correction Factors, AIR Temp Altitude Feet

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246653-YTG-E-0108

CFM, STATIC PRESSURE, AND POWER - ALTI- TUDE 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 applica- tions, 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 36 and Figure 21.

TABLE 36: ALTITUDE CORRECTION FACTORS

AIR TEMP

 

 

 

 

ALTITUDE (FEET)

 

 

 

 

 

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

The examples below will assist in determining the airflow per- formance of the product at altitude.

Example 1: What are the corrected CFM, static pressure, and BHP at an elevation of 5,000 ft. if the blower performance data is 6,000 CFM, 1.5 IWC and 4.0 BHP?

Solution: At an elevation of 5,000 ft the indoor blower will still deliver 6,000 CFM if the rpm is unchanged. However, Table 36 must be used to determine the static pressure and BHP. Since no temperature data is given, we will assume an air temperature of 70°F. Table 36 shows the correction factor to be 0.832.

Corrected static pressure = 1.5 x 0.832 = 1.248 IWC

Corrected BHP = 4.0 x 0.832 = 3.328

Example 2: A system, located at 5,000 feet of elevation, is to deliver 6,000 CFM at a static pressure of 1.5". Use the unit

blower tables to select the blower speed and the BHP requirement.

Solution: As in the example above, no temperature informa- tion is given so 70°F is assumed.

The 1.5" static pressure given is at an elevation of 5,000 ft. The first step is to convert this static pressure to equivalent sea level conditions.

Sea level static pressure = 1.5 / .832 = 1.80"

Enter the blower table at 6000 sCFM and static pressure of 1.8". The rpm listed will be the same rpm needed at 5,000 ft.

Suppose that the corresponding BHP listed in the table is 3.2. This value must be corrected for elevation.

BHP at 5,000 ft = 3.2 x .832 = 2.66

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Johnson Controls Unitary Products

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Contents Millennium Simplicity Elite Features Millennium Single Package Rooftop UnitsTOMORROW’S Unit Today General FeaturingTable of Contents Power Exhaust ONE Forward Curve List of FiguresList of Tables Electrical Data 40 TON with ElectricFeatures and Benefits OverviewInstallation Features Construction Features List of Features and Benefits Standard FeaturesFactory Installed Options Field Installed AccessoriesNomenclature General Physical Data Selection Procedure Refrigerant ChargeSelect Unit Unit Tons Model TypeTemperature Rise Standard GAS Heating CapacitiesMinimum Heating CFM Modulating GAS Heating CapacitiesMBH Modulating HeatElectric Heating Capacities HOT Water HEATING1 Physical Data HOT Water Coil 1 ROWWater Pressure Drop 1 ROW, 25 & 30 TON Static Resistance HOT Water Coil 25 & 30 TONHOT Water Coil 1 ROW 40 TON1 HOT Water Coil 25 & 30 TON, 1 ROW, AT 10 GPM HOT Water Coil 25 & 30 TON, 1 ROW, AT 30 GPM HOT Water Coil 40 TON, 1 ROW, AT 10 GPM HOT Water Coil 40 TON, 1 ROW, AT 30 GPM Physical Data HOT Water Coil 2 ROW Water Pressure Drop 2 ROW, 25 & 30 TONHOT Water Coil 2 ROW, 25 & 30 TON1 HOT Water Coil 2 ROWS, 40 TON1HOT Water Coil 25 & 30 TON, 2 ROW, AT 20 GPM HOT Water Coil 25 & 30 TON, 2 ROW, AT 60 GPM HOT Water Coil 40 TON, 2 ROW, AT 20 GPM HOT Water Coil 40 TON, 2 ROW, AT 60 GPM Steam Heating Physical Data Steam Coil 1 ROWSteam Coil 1 ROW, 40 TON Static Resistance Steam Coil 1 ROW, 40 TONSteam Coil 40 TON, 1 ROW Exhaust FAN Drive Data Supply FAN Motor and Drive DATA1RPM STDSupply AIR Drive Adjustment Example40 TON Drive Adjustment 25 TON Drive Adjustment30 TON Drive Adjustment Drive Adjustment for Power Exhaust 25 TON Drive Adjustment for Power Exhaust 30 & 40 TONRPM REQ’D PD HP M Otor & 976 RPM D RiveCooling Performance 25 TON MBHCooling Performance 30 TON Standard Capacity Coil 95F 105F 125F Cooling Performance 30 TON High Capacity Coil 95F 105F CFM Cooling Performance 40 TON Standard Capacity Coil 95F 105F 115F 125F Cooling Performance 40 TON High Capacity Coil 95F 105F 115F 125F Altitude Correction Factors AIR Temp Altitude FeetYTG-E-0108 FAN Performance 25 TON1 Available External Static Pressure IWG Airflow CFM RPM BHP3800 FAN Performance 30 TON 1 RPM BHP3Ton Forward Curve FAN Performance 40 TON1,2 18000FAN Performance 40 TON FAN Performance 25 & 30 TON AIRFOIL1,2 1601 1636 1672 1707 1740 FAN Performance 40 TON AIRFOIL1,2 17000 18000 Component Static RESISTANCE1 Power Exhaust ONE Forward Curved FAN 25 TON1 Available External Static Pressure IWG Airflow CFM RPM BHP2Power Exhaust 25 Ton Power Exhaust TWO Forward Curved Fans 30 & 40 TON1 Power Exhaust TWO Forward Curved Fans 30 & 40 Tons Electrical Data 25 TON Basic Unit R22 Electrical Data 30 TON Basic Unit R22Electrical Data 40 TON Basic Unit R22 Electrical Data 25 TON with Electric Heat R22 MCAMPS RLA LRA MCC QTY FLAElectrical Data 30 TON with Electric Heat R22 QTY RLA LRA MCC FLAElectrical Data 40 TON with Electric Heat R22 Electrical Data 25 TON with Power Exhaust R22 Electrical Data 30 TON with Power Exhaust R22 Electrical Data 40 TON with Power Exhaust R22 RLA LRA MCC YTG-E-0108 11.0 14.2 100 22.2 17.0 22.0 110 208-3-60 460-3-60 11.0 17.0 12.4 19.3 100 22.0 110 27.0 102 109 125 107 208-3-60 460-3-60 11.0 17.0 100 12.4 19.3 110 22.0 101 125 27.0 107 102 109 Unit Weights Supply FAN Motor VFD WeightsExhaust FAN Motor VFD Weights LECT. H EATUnit Cornerweight Indoor Sound Power RatingOutdoor Sound Power Rating Attenuation FactorsRear Left Side Right Left Side Left Side Rear Front Rear Rear Millennium Overhead View Back View Endfixedreturnoutsideorwithair Partial Roof Curb Model 1RC0455P Guide Specifications York Millennium 25, 30, & 40 TON Units Energy Recovery Ventilation Field Installed Option AIR Filtering SystemAIR Inlet System Heating System OptionalRefrigeration System Electric Heating SectionHot Water Heating Coil Steam Heating CoilControls Comfort Control Features Equipment Control FeaturesOptional Communication Translator OverviewAvailable Accessories Optional ControlJohnson Controls Unitary Products York Drive Norman, OK

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