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SECTION 2 - PRODUCT DESCRIPTION
Brazed plate heat exchangers shall be UL (Underwrit-
ers Laboratories) listed. Installing contractor must in-
clude accommodations in the chilled water piping to
allow proper drainage and venting of the heat exchang-
er. Water inlet and outlet connections are grooved for
compatibility with factory supplied victaulic connec-
tions.
A strainer with a mesh size between .5 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 re-
sistant 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 resis-
tant aluminum hub and glass-fiber reinforced compos-
ite 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
equivalent to IP55*) cabinet and includes:
Liquid Crystal Display with Light Emitting Diode
backlighting for outdoor viewing:
•
Two display lines
•
Twenty characters per line
18
Display/Print
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
This section is used 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
This section is used to:
•
Set time
•
Set unit options
FORM 150.66-NM3
ISSUE DATE: 09/25/2020
JOHNSON CONTROLS
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