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JOHNSON CONTROLS
108
FORM 150.62-NM8 (1020)
UNIT CONTROLS
Option 4 – Ambient Control Type
(YCAL00014-00080 Only)
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
0°F (-17.8°C).
A low ambient kit MUST be installed
for this option to be chosen. If the kit
is NOT installed, and low ambient is
selected, low pressure faults and com
-
pressor damage may occur. YCAL0090
through 0134 are fixed in the Low
Ambient Mode as standard and cannot
be reprogrammed.
Option 5 – 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 control
can be used to monitor only. The micro panel will operate
on locally programmed values and ignore all commands
from the remote devices. 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:
• Remote Start/Stop
• Cooling Setpoint
• Load Limit
• History Buffer Request.
If the unit receives no valid ISN transmission for
five
minutes, it will revert back to the locally programmed
values.
Option 6 – 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 four to six 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
Unit control is based on leaving chilled liquid temp.
Refer to section on Capacity Control for details on
loading and unloading sequences. See Unit Operation
in Section 2 of this IOM
Option 7 – Display Units
D I S P L A Y U N I T S
I M
P E R I A L
This mode displays system operating values in Imperial
units of °F or psig.
or
D I S P L A Y U N I T S
S I
This mode displays system operating values in Scientific
International Units of °C or barg.
Option 8 – Lead/Lag Type
(two system units only)
SYS 1 selected as lead compressor. SYS 1 lead option
MUST be chosen if Hot Gas Bypass is installed.
or
L E A D / L A G C O N T R O L
M A N U A L S Y S 2 L E A D
SYS 2 selected as lead compressor.
or
L E A D / L A G C O N T R O L
A U T O
M
A T I C
L E A D / L A G C O N T R O L
M A N U A L S Y S 1 L E A D
Summary of Contents for YCAL0014E Series
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