JOHNSON CONTROLS
FORM 150.72-EG6 (516)
8
Equipment Overview
The 55 - 175 Ton (195 - 615 kW) YLAA models are shipped complete from the factory ready
for installa tion and use. The unit is pressure-tested, evacuated, and fully charged with a
zero Ozone Depletion Potential Refrigerant R-410A and includes an initial oil charge. After
assembly, a complete operational test is performed with water flowing through the evapo-
rator to as sure that the refrigeration circuit operates correctly.
The unit structure is heavy-gauge, galvanized steel. This galvanized steel is coated with
baked-on powder paint, which, when subjected to ASTM B117 1000 hour, salt spray test-
ing, yields a minimum ASTM 1654 rating of “6”. Units are designed in accordance with
NFPA 70 (National Electric Code), ASHRAE/ANSI 15 Safety code for mechanical refrig-
eration, ASME and rated in accordance with AHRI Standard 550/590 and 551/591.
COMPRESSORS
The chiller has suction-gas cooled, hermetic scroll com pressors. The YLAA compressors in-
corporate a compli ant scroll design in both the axial and radial direction. All rotating parts are
statically and dynamically balanced. A large internal volume and oil reservoir provides greater
liquid tolerance. Compressor-crankcase heaters are also included for extra protection against
liquid migration.
LD18425a
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