Johnson Controls R-410A Air Handling Unit Features and Benefits, Unit Installation, Accessories

505430-BTG-A-0309

Air Handling Unit Features and Benefits

Features

These air handlers can be arranged for a variety of air discharge patterns in either the horizontal or vertical position. Refer to the unit installation instructions for other application possibilities.

Benefits

Air handling units are designed with two distinct modules to provide maximum application flexibility. All are shipped as single packages with the blower module mounted on top of the coil module. The blower module can be repositioned in the field to meet a large number of vertical and horizontal applications.

The blower module includes the blower wheels along with factory-mounted motor and drive. All models offer two motor horsepower options to meet both standard and high static airflow requirements. The coil module includes direct expansion coils, 2 in. throwaway filters with the option to accept 4” filters, liquid line solenoid valves for capacity reduction, thermal expansion valves, distributors and a non- corrosive, composite condensate drain pan.

Every air handling coil is pressurized with air and leak tested under water. After the headers are brazed onto the coil and the coil is installed in the unit, the coil is pressurized with a combination of Refrigerant R-410A and nitrogen for pressure testing and additional leak testing. After the coil is evacuated and dehydrated, it is pressurized with a holding charge of Refrigerant R-410A for storage and/or shipping.

These air handlers, combined with condensing units, provide years of quiet, efficient and dependable operation. These units are manufactured under ISO 9001 Quality System Certification.

Unit Installation

Units may be bottom-supported or ceiling-suspended and can be arranged to meet almost any space or duct requirements. Each unit is available with a choice of blower motors horsepower and other accessories to make them suitable for most applications.

Blower Motors: Different HP motors are available for each unit to meet almost any air delivery requirement. All motors are UL approved, have permanently lubricated ball bearings and are factory-mounted within the insulated cabinet of the units to minimize the transmission of sound to the surrounding space.

Air Handling units are available in either two or four pipe configurations from 7.5 to 20 tons. The dual and single circuit options provide a wide variety of application and unit match- up possibilities.

Factory-Mounted Components

Part Load Operation: These air handlers with DX (Direct Expansion) coils rated at 10 tons of capacity and above have multiple coils with pre-piped distributors, expansion valves and solenoid valves. Field modifications are not required for part load operations. Capacity reduction not only provides economical operation, but also maintains stable temperature and humidity levels in the conditioned space.

Easy Service: Serviceable expansion valves are provided on every unit. These valves are factory-installed to provide many years of trouble-free operation. If service is required, it is not necessary to unbraze any joints. The expansion valves also include a tee fitting to allow easy installation of hot gas bypass if required.

Coil Protection: The indoor coils of these air handlers can be factory Technicoated to provide extended life to the indoor coil in standard applications and additional corrosion protection on those applications in sea coast or corrosive environments.

Blower Motors: Different HP motors are available for each unit to meet almost any air delivery requirement. 1.5-5 HP motors are inherently protected. 7.5 HP will come equipped with a motor starter and overload protection.

Accessories

Base Sections: Base sections can be used to elevate units above the floor. If desired, a moderate percentage of outdoor air may be introduced through these sections by cutting an access opening to accommodate the outdoor air duct connection. These bases include a durable finish to match the evaporator blower unit. The base may have to be insulated for certain applications.

Hot Water Coils: Drainable water coils are available for field installation between the blower and the coil modules of both horizontal and vertical units. Since their casings match the dimensions and the finish of the basic units, they become an integral part of the unit after installation. The coils slide out of their casings for easy installation. Hot water coils have copper tubes that have been mechanically expanded into aluminum fins. Both headers are located on the same end of the coil. Coils are leak-tested at 325 psig under water and dried before their connections are capped for storage and shipping.

Steam Coils: Steam coils are available for installation between the blower and coil modules of both horizontal and vertical units. Since the casing matches the dimensions and the finish of the basic unit, it becomes an integral part of the unit after installation. The coil slides out of the casings for easy installation and is pitched in the casings to facilitate condensate drainage. The coil has copper tubes that have been mechanically expanded into aluminum fins. Both headers are located on the same end of the coil. The coil is leak-tested at 325 psig and dried before the connections are capped for storage and shipping.

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