Specifications

FORM 150.72-NM1 (908)
17
JOHNSON CONTROLS
2
UNIT ON/OFF switch
The microprocessor control center is capable of
displaying the following:
• Return and leaving liquid temperature
• Low leaving liquid temperature cutout setting
• Low ambient temperature cutout setting
• Outdoor air temperature
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure
• Discharge pressure (optional)
• Liquid Temperature Reset via a Johnson Controls
ISN DDC or Building Automation System (by
others) via:
- a pulse width modulated (PWM) input as stan-
dard.
- a 4-20 milliamp or 0 -10 VDC input with the
optional B.A.S. interface option.
• Anti-recycle timer status for each system
• Anti-coincident system start timer condition
• Compressor run status
• No cooling load condition
• Day, date and time
• Daily start/stop times
• Holiday status
• Automatic or manual system lead/lag control
• Lead system denition
• Compressor starts & operating hours
(each compressor)
• Status of hot gas valves, evaporator heater
and fan operation
• Run permissive status
• Number of compressors running
• Liquid solenoid valve status
• Load & unload timer status
• Water pump status
* Intensity of Protection European Standard
** International Electrotechnical Commission
Provisions are included for: pumpdown at shutdown;
optional remote chilled water temperature reset and two
steps of demand load limiting from an external building
automation system. Unit alarm contacts are standard.
The operating program is stored in non-volatile memory
battery backed RAM to eliminate chiller failure due to
AC powered failure/battery discharge. Programmed
setpoints are retained in lithium battery-backed RTC
memory for 5 years minimum.
HIGH AMBIENT KIT
Allows units to operate when the ambient temperature
is above 115°F (46°C). Includes sun shield panels and
discharge pressure transducers.
BUILDING AUTOMATION SYSTEM
INTERFACE
The Microprocessor Board can accept a 4-20 milliamp, 0-
10VDC or contact closure input to reset the leaving chiller
liquid temperature from a Building Automation System.
Only one of the following remote communications
options can be offered on a unit at a time: BAS Interface,
Remote Control Panel or Multi-unit Sequence Control.
(Factory Mounted)
- The standard unit capabilities include remote
start-stop, remote water temperature reset via a
PWM 4-20 milliamp or 0-10VDC input signal
or up to two stages of demand (load) limiting
depending on model.
- The standard control panel can be directly con-
nected to a Johnson Controls Building Automated
System.
POWER PANEL
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per
l.E.C.**
• Control power terminals to accept incoming for
115-1-60 control power
• Fan contactors & overload current protection
The power wiring is routed through liquid-tight conduit
to the compressors and fans.