York Y33 User Manual download pdf (Page 89)

246653-YTG-E-0108

Johnson Controls Unitary Products 89

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 computer-run tested prior to shipment. The Millennium

is designed to be flexible enough to meet your needs today

and in the future. The true value of York's Millennium is that it

can be designed to fit any need, from cooling only, constant

volume applications to variable air volume systems with vari-

able frequency drive.

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 R-22 refriger-

ant. The manufacturing facility shall be registered under ISO

9001 Quality Standards for Manufacturing. Units shall carry

both ETL and CSA safety approval ratings. Tags and decals

to aid in the service or indicate caution areas shall be pro-

vided. Installation and maintenance manuals shall be sup-

plied with each unit. Units shall be capable of providing

mechanical cooling down to 40°F (0°F with low ambient kit).

Unit shall be capable of starting and running at 125°F. Unit

electric and gas connections shall be either through the curb

or the side of the unit.

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 B-117. The

unit shall be insulated with 1-1/2", 1 pound density fiberglass

insulation between the two sheet metal skins. Insulation shall

meet NFPA-90A regulations for smoke and flame spread rat-

ings. The cabinet corner post and the intermediate side sup-

ports shall be 16 gauge steel. All access doors shall be 18

gauge on the exterior surfaces, and 20 gauge on the interior.

Floor shall be 18 gauge, and 24 gauge. All serviceable sec-

tions shall have hinged access doors with latches on both

sides of the unit. All access doors shall be constructed of 20

gauge steel on the outside, with 24 gauge on the inside. Each

door shall seal against a rubber gasket to prevent air and

water leakage. The roof shall be double wall, with 18 gauge

on the external surface and 24 gauge on the interior. The roof

shall be formed with a 45 degree drip lip overhanging the

sidewalls to prevent precipitation drainage from streaming

down the side of the unit. Roof sections shall be connected

together via integral channels fastened with screws and

sealed with rubber gasketing. Each fastened seam shall be

further protected by a sheet metal channel covering the full

length of the gasket surface, making a completely water tight

seal.

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

double-width, double-inlet with forward curved blades.

OPTIONAL

On variable air volume units without variable frequency

drives, fans shall be provided with heavy gauge, corrosion

resistant blades, with zinc-plated steel inter-locking operating

mechanism. Both inlet vanes must operate from a single

shaft and be synchronized for precise control.

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 self-aligning pillow-block re-greasable ball

bearings with an average life expectancy of 200,000 hours.

Grease fittings shall be accessible through access doors. Fan

motors shall be NEMA designed, Standard efficiency (option,

Hi-efficiency) ball bearing type with electrical characteristics

and horsepower as specified. Motors shall be 1750 RPM,

open drip proof type. The motor shall be located within the

unit on an adjustable, heavy steel base. All fan motor drives

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York Y33 User Manual Page 89

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