York K4EU120A50A, K5EU090A50A Typical Motor Mounting Assembly, Blower Drive Range RPM, Turns Open

Page 7

3.Using an inclined manometer, determine the pressure drop across a dry evaporator coil. Since the moisture on an evaporator coil may vary greatly, measuring the pressure drop across a wet coil under field conditions would be inac- curate. To assure a dry coil, the refrigerant system should be de-energized while the test is being run.

4.Knowing the pressure drop across a dry coil, the actual air- flow through the unit can be determined from the curve in Figure 7.

If the airflow is above or below the specified valve, the supply air motor pulley may have to be readjusted. After one hour of operation, check the belt and pulleys for tightness and align- ment.

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

550.39-N4YI

After readings have been obtained, remove the tubes and seal up the drilled holes in the side panel with 516" (8mm) dia. dot plugs (P/N 029-13880) available through normal parts ordering procedure.

TABLE 3 - SUPPLY AIR BLOWER MOTOR PULLEY ADJUSTMENT

 

BLOWER DRIVE RANGE (RPM)

TURNS OPEN*

KEU090

KEU120

 

650 -850

700 - 910

5

650

700

4

690

740

3

730

780

2

770

830

1

810

870

0

850

910

* Pulleys can be adjusted in half-turn increments.

FIG 6 - TYPICAL MOTOR MOUNTING ASSEMBLY

FIG. 7 - PRESSURE DROP ACROSS A DRY EVAPORATOR COIL VS SUPPLY AIR CFM

DIMENSIONS (in./mm)

A

B

C

D

 

 

 

 

3 / 76

3 / 76

14 / 356

12 / 305

 

 

 

 

NOTE: DE-ENERGIZE THE REFRIGERANT SYSTEM BEF- ORE TAKING ANY TEST MEASUREMENTS TO AS- SURE A DRY EVAPORATOR COIL.

FIG. 8 - HOLE LOCATIONS (PRESSURE DROP READINGS)

Unitary Products Group

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Contents Inspection GeneralReference Table of Contents Unit Application Data InstallationLimitations LocationDuct Connections VERTICAL/HORIZONTAL InstallationClearances Rigging and HandlingRefrigerant Mains Installing Refrigerant MainsExpansion Valve Bulb Supply AIR Blower AdjustmentDrain Connection Blower Drive Range RPM Typical Motor Mounting AssemblyTurns Open Input ESP2 KEU090 Supply AIR Blower PERFORMANCE1 CFMESP Input ESPElectrical Data Accessory External Static Pressure Drop ResistanceFLA Bottom Unit Dimensions and ClearancesAccessories Electric Heater Supply AIR PlenumMotor Specifica Tions Power and Control WiringControl Wiring Blower Motor and Drive DataMaintenance

K4EU120A50A, K5EU090A50A specifications

The York K4EU120A50A and K5EU090A50A are high-performance commercial air conditioning units designed for efficiency and reliability. These models integrate advanced technology to meet the demanding cooling needs of various commercial spaces.

One of the primary features of the K4EU120A50A is its high capacity cooling ability, rated at 120,000 BTU, making it ideal for medium to large commercial environments such as office buildings, retail stores, and warehouses. The K5EU090A50A offers a slightly lower capacity of 90,000 BTU, suitable for smaller commercial areas or specific zoned applications within larger buildings. Both units are equipped with energy-efficient compressors that ensure optimal performance while reducing overall energy consumption.

The K4EU and K5EU series utilize variable speed technology, which allows the units to adjust their cooling output based on the space's specific requirements. This feature not only enhances comfort by maintaining consistent temperatures but also contributes to lower operating costs. The inverter-driven compressor technology further enhances energy efficiency by continuously adjusting the cooling output to match the varying demands of the environment.

Both models include advanced air filtration systems designed to improve indoor air quality. The filters capture dust, pollen, and other airborne particles, promoting a healthier atmosphere for occupants. Additionally, the units feature a robust and corrosion-resistant cabinet design, ensuring durability even in harsh conditions.

Installation flexibility is another strong point of the K4EU and K5EU series. These units can be installed in various configurations, including rooftop, ground level, or wall-mounted setups, accommodating different building designs and layouts. The user-friendly control system allows for easy adjustments and monitoring, providing real-time data on performance and energy usage.

The York K4EU120A50A and K5EU090A50A models are also designed with quiet operation in mind. The sound-attenuating components reduce noise levels, making them suitable for environments where noise can be a concern.

In summary, the York K4EU120A50A and K5EU090A50A are distinguished by their high cooling capacities, energy efficiency, advanced technology, and enhanced indoor air quality features. They provide reliable cooling solutions tailored to the needs of commercial users, ensuring comfort and sustainability in a variety of settings.
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