York D2CG Mechanical Specifications, General Description, Unit Cabinet, Refrigerant Components

036-21359-001-B-0302

MECHANICAL SPECIFICATIONS

GENERAL DESCRIPTION

Units shall be factory-assembled, single packaged, (DCG Electric Cooling/Gas Heat, DCE Electric Cooling/ Optional Electric Heat), designed for outdoor mounted installation. Units shall have minimum EER ratings of

8.5.They shall have built in field convertible duct con- nections for down discharge supply/return or horizontal discharge supply/return, and be available with factory installed options or field installed accessories.

The units shall be factory wired, piped, charged with R- 22 refrigerant and factory tested prior to shipment. All unit wiring shall be both numbered and color coded. Enclosed in each unit shall be a factory test log sheet consisting of the unit tested pressures, temperatures and amps, as tested prior to shipment.

All units shall be manufactured in a facility certified to ISO 9001 standards and the cooling performance shall be rated in accordance with DOE and ARI test proce- dures. Units shall be ETL & CGA listed, classified to ANSIZ21.47 standards, UL 1995/CAN/CSA No. 236- M90 conditions.

UNIT CABINET

1.Unit cabinet shall be constructed of G90 galva- nized steel, with exterior surfaces coated with a non-chalking, powered paint finish, certified at 750 hours salt spray test per ASTM-B117 standards.

2.Indoor blower section shall be insulated with up to 1" thick insulation, coated on the air side. Alumi- num foil faced insulation shall be used in the fur- nace compartment and be fastened with ridged fasteners to prevent insulation from entering the air stream.

3.Cabinet panels shall be “large” size, easily remov- able for servicing and maintenance.

4.Full perimeter base rails shall be provided to assure reliable transit of equipment, overhead rig- ging and proper sealing on roof curb applications.

5.Disposable 2" filters shall be furnished and be accessible through a removable access door, sealed air tight. Units filter track shall be designed to accommodate either 1" or 2" filters.

6.Fan performance measuring ports shall be pro- vided on the outside of the cabinet to allow accu- rate air measurements of evaporator fan performance without removing panels or creating air by-pass of the coils.

7.Condensate pan shall be internally sloped and conform to ASHARE 62-89 self-draining standards. Condensate connection shall be a minimum of 1" I.D. female and be a ridged mount connection.

8.Unit shall incorporate a fixed outdoor air damper with an outdoor air intake opening covered with a bird screen and a rain hood painted to match the exterior of the unit.

INDOOR (EVAPORATOR) FAN ASSEMBLY

1.Fan shall be a belt drive assembly and include an adjustable-pitch motor pulley. Job site selected (B.H.P.) brake horse power shall not exceed the motors nameplate horse power rating, plus the ser- vice factor. Units shall be designed not to operate above service factor.

2.Fan wheel shall be double-inlet type with forward- curved blades, dynamically balanced to operate smoothly throughout the entire range of operation. Airflow design shall be constant air volume.

3.Bearings shall be sealed and permanently lubri- cated for longer life and no maintenance.

OUTDOOR (CONDENSER) FAN ASSEMBLY

1.The outdoor fans shall be of the direct-driven pro- peller type, discharge air vertically, have blades riveted to corrosion resistant steel spider brackets and shall be dynamically balanced for smooth operation.

2.The 2 outdoor fan motors shall be totally enclosed with permanently lubricated bearings, internally protected against overload conditions and staged independently.

REFRIGERANT COMPONENTS

1.Compressors:

A.Shall be fully hermetic type, direct drive, internally protected with internal high-pressure relief and over temperature protection. The hermetic motor shall be suction gas cooled and have a voltage range of + or - 10% of the unit nameplate voltage.

B.Shall have internal spring isolation and sound muf- fling to minimize vibration and noise, and be exter- nally isolated on a dedicated, independent mounting.

2Coils:

A.Evaporator and condenser coils shall have alumi- num plate fins mechanically bonded to seamless internally-enhanced copper tubes with all joints brazed. Special Phenolic coating shall be available as a factory option.

Unitary Products Group 15