JOHNSON CONTROLS
133
SECTION 7 – UNIT CONTROLS
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
7
S Y S 1 S W I T C H O F F
S Y S 2 S W I T C H O N
This turns system 1 OFF.
or
S Y S 1 S W I T C H O F F
S Y S 2 S W I T C H O F F
This turns systems 1 and 2 OFF.
Turning a system OFF with its system
switch allows a pumpdown to be per-
formed before shutdown.
Option 3 – Ambient Control Type
A M B I E N T C O N T R O L
S T A N D A R D
The low ambient cutout is adjustable from 25°F to 60°F
(-3.9°C to 15.6°C).
or
A M B I E N T C O N T R O L
L O W A M B I E N T
The low ambient cutout is programmable down to
-10°F (-23.3°C). A low ambient kit and variable
speed fans MUST be installed for this option to be
chosen. If the kit is NOT installed, and low ambi-
ent is selected, low pressure faults and compressor
damage may occur.
Option 4 – Local/Remote Control Type
L O C A L / R E M O T E M O D E L
L O C A L
When programmed for LOCAL, an ISN or RCC con-
trol can be used to monitor only. The micro panel will
operate on locally programmed values and ignore all
commands from remote devices, or through the RS-
485 inputs. The chiller will communicate and send data
to the remote monitoring devices.
or
L O C A L / R E M O T E M O D E
R E M O T E
This mode should be selected when an ISN or RCC
control is to be used to control the chiller. This mode
will allow the ISN to control the following items: Re-
mote Start/Stop, Cooling Set Point, Load Limit, and
History Buffer Request. If the unit receives no valid
ISN transmission for 5 minutes, it will revert back to
the locally programmed values.
Option 5 – Unit Control Mode
C O N T R O L M O D E
R E T U R N L I Q U I D
Unit control is based on return chilled liquid temp.
Return Chilled Liquid Control can only be selected on
units that have 4 to 6 compressors (dual system units).
or
C O N T R O L M O D E
L E A V I N G L I Q U I D
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