JOHNSON CONTROLS
16
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
SECTION 2 – PRODUCT DESCRIPTION
The evaporator is equipped with a thermostat-con-
trolled heater. The heater provides freeze protection
for the evaporator down to -20°F (-29°C) ambient. The
evaporator is covered with 3/4 in. flexible, closed-cell,
foam insulation (K=0.25).
A 1/16 in. (1.6 mm) mesh wye-strainer is provided as
standard for installation upstream of the heat exchang-
er to prevent clogging from water system debris.
Condenser
Microchannel Condenser (MCHX)
MCHX Condensers are made of a single material to
avoid galvanic corrosion due to dissimilar metals.
MCHX and headers are brazed as one piece. Integral
sub cooling is included. The design working pressure
of the MCHX is 650 psig (45 bar). MCHX Condenser
is easily washable with clear water.
Fans
The condenser fans are composed of corrosion resis-
tant aluminum hub and glass-fiber reinforced poly-
propylene composite blades molded into a low noise
airfoil section. They are designed for maximum effi-
ciency and are statically and dynamically balanced for
vibration free operation. They are directly driven by
independent motors, and positioned for vertical air dis-
charge. The fan guards are constructed of heavy gauge,
rust resistant, coated steel. All blades are statically and
dynamically balanced for vibration free operation.
Motors
The fan motors are Totally Enclosed Air-Over, and are
current protected. They feature ball bearings that are
double sealed and permanently lubricated.
Control Center
All controls are contained in a NEMA 3R/12 cabinet
with hinged outer door and includes a Liquid Crystal
Display with Light Emitting Diode backlighting for
outdoor viewing:
• Two display lines
• Twenty characters per line
Display/Print Keys
• Color coded 12-button non-tactile keypad with sec-
tions for display and 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 Keys
This section is used to enter set points or modify sys-
tem values.
Set Points Keys
Updating can be performed to:
• Chilled liquid temperature set point 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 Keys
This section is used to:
• Set time
• Set unit options
Oper Data Key
The microprocessor control center is capable of dis-
playing 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
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