GUIDE SPECIFICATIONS - YORK MILLENNIUM 25, 30, & 40 TON UNITS
GENERAL
Units shall be manufactured by Johnson Controls Unitary Products in an ISO 9001 certified facility. Introducing the YORK Millennium 25, 30, & 40 ton rooftop line - units designed to provide peak performance and value both today and for years to come. Millennium units are manufactured at an ISO 9001 registered facility, and each rooftop is com- pletely
DESCRIPTION
Supply York Millennium packaged rooftop system in accor- dance with the capacities in the plans. Units shall be rated by the manufacturer at a minimum (30/40 Ton units: 9.5 EER / 25 Ton units: 10 EER) according to ARI 360. Units shall be shipped in a single package, fully charged with
CONSTRUCTION
Base
The base rail shall be constructed of 12 gauge galvanized steel, extending the full perimeter of the unit. All components shall be supported from the base, and the base shall include integral lifting lugs. The unit base rail shall overhang the roof curb for water runoff and shall have a fabricated recess with a continuous flat surface to seat on the roof curb gasket, pro- viding a positive, weather tight seal between the unit and the curb.
Casing
The unit cabinet shall be double wall construction to provide both maximum resistance to bacterial growth in the air stream and superior structural integrity. All sheet metal shall be G90 mill galvanized sheet metal, formed and reinforced to provide a rigid assembly. Sheet metal shall be cleaned in an alkaline and zinc phosphate bath, and the exterior surfaces shall be coated with a 1.5 mil powder paint, capable of withstanding 1000 salt spray hours in accordance with ASTM
meet
SUPPLY AIR SYSTEM
SUPPLY AIR FAN
Fans shall be centrifugal type - Class I or Class II, statically and dynamically balanced in the factory. Fan wheels shall be designed for continuous operation at the maximum rate of fan speed and motor HP. The fan and motor assembly shall be mounted on a common base to allow consistent belt tension with no relative motion between the fan and motor shafts. The entire assembly shall be isolated from the unit base with (optional 1”, 2" deflection springs or rubber isolators). The fan discharge shall be connected to the cabinet through a rein- forced neoprene flexible connection to eliminate vibration transmission from the fan to the unit casing. Fans shall be
OPTIONAL
On variable air volume units without variable frequency drives, fans shall be provided with heavy gauge, corrosion resistant blades, with
Units equipped with variable frequency drive on supply fan must be controlled by a duct static transducer providing a 2- 10 VDC signal to the drive. Supply fan variable frequency drives shall have factory option of being equipped with a manual drive bypass.
BEARINGS AND DRIVES
Bearings shall be
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