JOHNSON CONTROLS
20
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
SECTION 2 - PRODUCT DESCRIPTION
Parameters are displayed in 5 languages in either Eng-
lish (°F and psig) or Metric (°C and bar) units, and for
each circuit, the following items can be displayed:
• Entering and leaving chilled liquid, and ambient
temperature.
• Day, date and time. Daily start/stop times. Holi-
day and Manual Override status.
• Compressor operating hours and starts. Automatic
or manual lead/lag. Lead compressor identica-
tion.
• Run permissive status. Compressor run status.
• Anti-recycle timers.
• System suction (and suction superheat), discharge
(and discharge superheat), and oil pressures and
temperatures.
• Percent full load compressor motor current and
average motor current. Compressor motor speed
(frequency).
• Cutout status and setpoints for supply chilled liq-
uid temperature, low suction pressure, high dis-
charge pressure and temperature, high oil tem-
perature, low ambient, and low leaving liquid
temperature.
• Unloading limit setpoints for high discharge pres-
sure and compressor motor current.
• Status of evaporator heater, condenser fans, load/
unload timers, and chilled water pump.
• “Out of range” message.
• Up to 10 fault shutdown histories.
Keypad
An operator keypad allows complete control of the
system from a central location. The keypad utilizes an
overlay to allow use in 5 languages. The keypad is a
color-coded, 36 button, sealed keypad with keys for
Display, Entry, Setpoints, Clock, Print, Program, Unit
ON/OFF and other functions. Details on a few of the
keys follow:
Status – Allows viewing present unit or system status
displayed by the microprocessor.
Entry – Numeric keypad and supporting keys used to
confirm Setpoint changes, cancel inputs, advance day,
and change AM/PM.
Setpoints – For setting chilled liquid temperature,
chilled liquid range, remote reset temperature range.
Date/Time – Used to set time, daily or holiday start/
stop schedule, manual override for servicing, and
sound limiting schedule.
Print – Used to display or print operating data or sys-
tem fault shutdown history for last ten faults. Printouts
are generated through an RS-232 port via a separate
printer.
Program – For setting low leaving liquid temperature
cutout, average motor current limit, and pulldown de-
mand limit.
Displays are also provided for programming low am-
bient cutout, low suction pressure cutout, superheat
setpoint, etc., under the PROGRAM key.
Unit Switch
A master UNIT switch allows activation or de-activa-
tion of the chiller system. Separate system switches
for controlling each system are provided as part of the
chiller control panel keypad.
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