JOHNSON CONTROLS
16
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 2 – PRODUCT DESCRIPTION
REFRIGERANT CIRCUIT
Two inde pendent refrigerant circuits will be furnished
on each unit. All unit piping will be copper, with brazed
joints. The liquid line will include a field connection
shutoff valve with charg ing port located on each con-
denser circuit. Suction line connections are provided
on each refrigeration circuit. A filter drier and sight
glass are shipped loose for field installation on each
refrigerant circuit.
All expansion valves, liquid line solenoid valves,
refriger ant, and refrigerant field piping are supplied by
others.
MICROCOMPUTER CONTROL CENTER
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
Color coded 12-button non-tactile keypad with sec-
tions for:
DISPLAY/PRINT of typical information:
• Suction temperatures (optional)
• 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:
• Suction pressure setting
• Suction pressure control zone
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low and high ambient cutouts
• Number of compressors
• 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 clock
• Set options
• Set unit option
Set unit control for Discharge Air Temperature Control
or for Suction Pressure Control (requires Suction Pres-
sure Transducers – standard).
UNIT ON/OFF switch
The microprocessor control center is capable of
display ing the following:
• Suction temperatures (optional)
• Low ambient temperature cutout setting
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure
• System discharge pressure
• Discharge Air Temperature Reset via a YORK
ISN DDC or Building Automation System (by
others) via:
- a pulse width modulated (PWM) input as stan-
dard
- a 4 mA to 20 mA or 0 VDC to 10 VDC input, or
contact closure with the optional B.A.S. inter-
face option
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