JOHNSON CONTROLS
16
FORM 150.67-NM2
ISSUE DATE: 01/31/2019
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.
The heat exchanger is a brazed plate stainless steel con-
struction, single or dual circuit heat exchanger capable
of refrigerant working pressure of 650 PSIG (3103
kPa) and liquid side pressure of 150 PSIG (1034 kPa)
(Option for 300 PSIG [2068 kPa] available). Each heat
exchanger is covered in 3/4” (19mm) flexible, closed
cell insulation, thermal conductivity of 0.26k (BTU/
HR-FT2 – °F] /in) maximum.
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, in-
ternally-enhanced, high-condensing-coefficient, corro-
sion resistant copper tubes are arranged in staggered
rows, mechanically expanded into aluminum fins. Inte-
gral subcooling is included. The design working pres-
sure of the coil is 650 PSIG (45 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 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. All blades are statically and dynamically bal-
anced 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 (TEAO), direct drive, 6 pole, current protected.
They feature ball bearings that are double-sealed and
permanently lubricated.
CONTROL CENTER
All controls are contained in a NEMA 3R/12 (and
equivalent to IP55*) cabinet with hinged outer door
and includes:
Liquid Crystal Display with Light Emitting Diode
backlighting for outdoor viewing:
• Two display lines
• Twenty characters per line
Color coded 12-button non-tactile keypad with sec-
tions 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
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