12
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
The IP54 fan motors are the totally enclosed air-over
type with permanently lubricated double-sealed ball
bearings.
POWER AND CONTROLS PANELS
All power and controls are contained in an IP 55 cabinet
with hinged and gasket sealed outer doors.
The power panel includes:
• A factory mounted non-fused disconnect switch
with external (red/yellow) lockable handle to enable
connection of the unit power supply. The disconnect
switch can be used to isolate the power for servicing
and as a emergency stop.
• Factory mounted compressor contactors and
compressor fuses provide short circuit protection.
Overload protection for each compressor is provided
by inherent motor winding temperature sensing and
a trip module.
• Factory mounted fan contactors and fuses provide
short circuit protection. Overload protection for
each fan is provided by a inherent motor winding
temperature device.
• Factory mounted control transformer to convert the
unit supply voltage to 115 V - 1 Ø - 60 Hz for the
control system.
• Control supply fuses and connections for a remote
emergency stop device.
The control panel includes:
• A Liquid Crystal Display (two display lines of twenty
characters per line) with Light Emitting Diode
backlighting for easy viewing.
• A Color coded 12-button keypad.
• Customer terminal blocks for control inputs and liquid
ow switch.
MICROPROCESSOR CONTROLS
The microprocessor control includes:
• Automatic control of compressor start/stop,
anticoincidence and anti-recycle timers, pump and
unit alarm contacts. Automatic reset to normal unit
operation after power failure.
• Remote water temperature setpoint reset via an analog
input or a pulse width modulated (PWM) input signal,
or up to two steps of demand (load) limiting.
• Software is loaded into the microprocessor controller
via a SD card, with programmed setpoints retained in a
lithium battery backed real time clock (RTC) memory.
• Forty character liquid crystal display, with description
available in several languages.
Programmable setpoints:
• Chilled liquid temperature setpoint and range
• Hot liquid temperature setpoint and range
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low ambient cutout
• High ambient cutout (heating only - xed)
• 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)
• Cooling suction superheat
• Heating suction superheat
Displayed Data:
• Leaving liquid temperature
• Air coil defrost temperatures
• Low leaving liquid temperature cutout setting
• Low ambient temperature cutout setting
• EEV output
• Suction superheat
• Suction temperature
• Suction saturated temperature
• Ambient air temperature
• Metric or Imperial data
• Discharge and suction pressure cutout settings
• System discharge and suction pressures
• Anti-recycle timer status for each system
• Anti-coincident system start timer condition
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