York DNH018 - Manual (Page 30)

036-21233-002-A-0903
30 Unitary Products Group
REFRIGERANT COMPONENTS
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 isolation and sound muffling to
minimize vibration and noise, and be externally iso-
lated on a dedicated, independent mounting.
Coils:
a. Evaporator and condenser coils shall have alumi-
num plate fins mechanically bonded to seamless
internally enhanced copper tubes with all joints
brazed.
b. Evaporator coil shall be of the direct expansion,
blow through design, while condenser coil shall be
draw through design.
Refrigerant Circuit and Refrigerant Safety Components:
a. Shall include independent fixed-orifice expansion
devices.
b. Shall include filter/strainer to eliminate any foreign
matter.
UNIT OPERATING CHARACTERISTICS
Unit shall be capable of starting and running at 125º F out-
door temperature, exceeding maximum load criteria ARI
Standard 210/240. The compressor, with standard controls,
shall be capable of operation down to 45º F outdoor tempera-
ture. Accessory low ambient kit shall be available for opera-
tion to 0º F.
ELECTRICAL REQUIREMENTS
All unit power wiring shall enter unit cabinet at a single factory
provided location and be capable of side or bottom entry, to
minimize roof penetrations and avoid unit field modifications.
Separate side and bottom openings shall be provided for the
control wiring.