York Y34, Y33, Y32 manual Supply AIR Drive Adjustment, Example

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246653-YTG-E-0108

SUPPLY AIR DRIVE ADJUSTMENT

At unit start-up, the measured CFM may be higher or lower than the specified CFM shown in Figures 22, 23, and 24. To achieve the specified CFM, the speed of the drive may have to be decreased or increased by changing the pitch diameter (PD) of the motor sheave as outlined below:

Failure to properly adjust the total system air quan- tity can result in extensive blower damage.

Before making any blower speed changes review the installation for any installation errors, leaks or undesirable systems effects that can result in loss of air flow.

Even small changes in blower speed can result in substantial changes in static pressure and bhp. Bhp or amp draw of the blower motor will increase (see table) by the cube ratio of the blower speed. Static pressure will increase by the square ratio of the blower speed. Tables 26, 27 and 28 are for reference only. All blower speed changes must be made by qualified personnel with strict adherence to the fan laws.

Example:

A 30-ton unit was selected to deliver 12,000 CFM with a 20 HP motor and a 856 RPM drive, but the unit is only delivering 11,000 CFM per Figure 23.

Use the equation to determine the required PD for the new motor sheave (12,000 CFM / 11,000 CFM) x 6.7” = 7.31”.

Use the 30-ton table to select a Browning 2B5V74 which will increase the speed of the unit's drive and its supply air CFM 109%.

New drive speed =

1.091 x 856 = 933 RPM

New supply air =

1.091 x 11,000 = 12,000 CFM

Re-use the existing belts and blower sheave.

New motor BHP = (speed increase)3 x estimated motor BHP at original start-up with 11,000 CFM and 856 RPM = (1.091)3 x 11.0 BHP = 1.2986 x 11.0 BHP = 14.3 BHP New motor amps = (speed increase)3 x measured motor amps at original start-up with 11,000 CFM and 856 RPM.

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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 CapacitiesElectric Heating Capacities Modulating HeatMBH 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 Example30 TON Drive Adjustment 25 TON Drive Adjustment40 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

Y32, Y34, Y33 specifications

The York Y33, Y32, and Y34 series represents a significant advancement in rooftop packaged units designed for commercial HVAC applications. These models are known for their reliability, energy efficiency, and innovative features that cater to diverse climate control needs.

The York Y33 series introduces modern features aimed at maximizing comfort and reducing energy costs. Its sleek design and compact size make it a versatile option for various applications, including retail spaces, office buildings, and industrial facilities. One of the standout features of the Y33 is its variable-speed compressor technology. This allows the unit to adjust its cooling output based on real-time demand, resulting in notable energy savings compared to traditional single-speed units.

The Y32 model builds upon the strengths of the Y33, offering enhanced capabilities for large commercial spaces. It incorporates advanced controls and building management system (BMS) connectivity, enabling seamless integration into existing infrastructure. The Y32 is designed with a focus on ease of maintenance and serviceability, featuring accessible components that streamline repair processes.

The York Y34 series emphasizes environmentally friendly practices, utilizing low-GWP refrigerants that minimizes its impact on the environment. It also boasts improved heat exchangers that increase efficiency and performance. The Y34’s design minimizes noise levels, making it ideal for applications where quiet operation is paramount, such as schools and healthcare facilities.

All three models share several key technologies, including fan and motor designs that optimize airflow while reducing energy consumption. Additionally, the series features enhanced insulation, significantly improving thermal performance and reducing the risk of condensation-related issues.

In summary, the York Y33, Y32, and Y34 models represent a commitment to innovation in commercial HVAC systems. Their combination of advanced technology, energy efficiency, and user-friendly design makes them suitable for a variety of applications while promoting sustainability and operational cost-effectiveness. Investing in these units not only supports optimal indoor climate control but also aligns with the growing demand for eco-friendly solutions in today’s commercial landscape.
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