York YLAA0195HE, Manual, Page: 18 / 206

JOHNSON CONTROLS
18
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 2 – PRODUCT DESCRIPTION
The evaporator is constructed, tested and stamped in
accordance with applicable sections of ASME pressure
vessel code for minimum 31.0 barg (450 psig) refrigerant
side design working pressure and 10.3 barg (150 psig)
water side design working pressure.
A strainer with a mesh size between .5 and 1.5 mm (40
mesh) is recommended upstream of the heat exchanger
to prevent clogging from water system debris.
Condenser
Coils – Condenser coils are Microchannel type and
made of a single material to avoid galvanic corrosion
due to dissimilar metals. Coils and headers are brazed as
one piece. Integral subcooling is included. The design
working pressure of the coil is 100 barg (1500 psig).
Fans – The condenser fans are composed of corrosion
resistant aluminum hub and glass-fiber reinforced
polypropylene composite blades molded into a low
noise airfoil section. They are designed for maximum
efficiency and are statically and dynamically balanced
for vibration free operation. They are directly driven
by independent motors and positioned for vertical air
discharge. The fan guards are constructed of heavy
gauge, rust resistant, coated steel.
Motors – The IP54 fan motors are Totally Enclosed Air-
Over, squirrel cage type, current protected. They feature
ball bearings that are double sealed and permanently
lubricated.
Ambient Kit (High) – Required if units are to operate
when the ambient temperature is above 46°C (115°F).
Includes discharge pressure transducers.
All controls are contained in a NEMA 3R/12 cabinet
with hinged outer door and include Liquid Crystal
Display with Light Emitting Diode backlighting for
outdoor viewing:
• Two display lines
• Twenty characters per line
A color coded 12-button non-tactile keypad provides
user access to:
DISPLAY/PRINT of typical information:
• Chilled liquid temperatures
• Ambient temperature
• System pressures (each circuit)
• Operating hours and starts (each compressor)
• Print calls up to the liquid crystal display
• Operating data for the systems
• History of fault shutdown data for up to the last
six fault shutdown conditions.
• An RS-232 port, in conjunction with this press-to-
print button, is provided to permit the capability
of hard copy print-outs via a separate printer (by
others).
ENTRY section to:
ENTER setpoints or modify system values.
SETPOINTS updating can be performed to:
• Chilled liquid temperature setpoint and range
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low and high ambient cutouts
• Number of compressors
• Low liquid temperature cutout
• Low suction pressure cutout
• High discharge pressure cutout
• Anti-recycle timer (compressor start cycle
time)
• Anti-coincident timer (delay compressor starts)
UNIT section to:
• Set time
• Set unit options