York AFFINITY BHZ Technical Manual page 6

718419-YTG-D-0613
totally enclosed with permanently lubricated bearings and
internally protected against overload conditions.
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 +/- 10%
of the unit nameplate voltage.
b. Shall have internal isolation and sound muffling to
minimize vibration and noise, and be externally isolated
on a dedicated, independent mounting.
Coils:
a. Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless internally
enhanced copper tubes with all joints brazed.
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b. Evaporator coil shall be of the direct expansion, draw
through design, while condenser coil shall be draw
through design.
Refrigerant Circuit and Refrigerant Safety Components shall
include:
a. Independent fixed orifice expansion devices.
b. Filter/strainer to eliminate any foreign matter.
Electric Heating Section (Field Install Accessory)
An electric heating section, with nickel chromium elements,
shall be provided in a range of 5 thru 25 KW. The heating
section shall have a primary limit control(s) (automatic reset) to
prevent the heating element system from operating at an
excessive temperature. The Heating Section assembly shall
slide out of the unit for easy maintenance and service. Units
with Electric Heating Sections shall be wired for a single point
power supply with branch circuit fusing (where required).
Johnson Controls Unitary Products