York YCAL0012EC, Установка, эксплуатация и обслуживание

Страница: 18 / 166

JOHNSON CONTROLS
18
FORM 150.66-NM2
ISSUE DATE: 09/25/2020
SECTION 2 - PRODUCT DESCRIPTION
proper drainage and venting of the heat exchanger. Water
inlet and outlet connections are grooved for compatibility
with factory supplied victaulic connections.
A strainer with a mesh size between 0.5 mm and
1.5 mm (40 mesh) is recommended upstream of the heat
exchanger to prevent clogging.
Condenser
Coils – Fin and tube condenser coils of seamless,
internally-enhanced, high-condensing-coefficient,
corrosion resistant copper tubes are arranged in
staggered rows, mechanically expanded into aluminum
fins. Integral subcooling is included. The design working
pressure of the coil is 450 psig (31 bar).
Low Sound Fans – The condenser fans are composed
of corrosion resistant aluminum hub and glass-fiber
reinforced 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. All blades are statically and dynamically
balanced for vibration-free operation. The fan guards
are constructed of heavy-gauge, rust-resistant, PVC
coated steel wire.
Motors – The fan motors are Totally Enclosed Air-
Over, squirrel-cage type, current protected. They feature
ball bearings that are double-sealed and permanently
lubricated.
Millennium Control Center
All controls are contained in a NEMA 3R/12 (and equiv-
alent to IP55*) cabinet and includes:
Liquid Crystal Display with Light Emitting Diode back-
lighting for outdoor viewing:
• Two display lines
• Twenty characters per line
Color coded 12-button non-tactile keypad with sections
for:
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
UNIT ON/OFF switch
The microprocessor control center is capable of
displaying the following:
• Return and leaving liquid temperature
• Low leaving liquid temperature cutout setting
• Low ambient temperature cutout setting
• Outdoor air temperature
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure
• Discharge pressure (optional)
• Liquid Temperature Reset via a YORK ISN DDC