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JOHNSON CONTROLS
109
FORM 150.62-NM8 (1020)
2
Option 11 – Current Feedback Options
Installed
C U R R E N T F E E D B A C K
N
O
N
E
This mode should be selected when the panel is not
equipped with current sensing capability.
or
This mode should be selected when an optional 2ACE
module is installed to allow combined current monitoring
of all systems by sensing current on the incoming line.
Current input is to J7-12 & J7-4 of the I/O Board.
or
C U R R E N T F E E D B A C K
O N E P E R S Y S T E M
This mode should be selected when an optional
2ACE module is installed to allow individual current
monitoring of each system. SYS 1 input is to J7-12 &
J7-4 of the I/O Board. SYS 2 input is to J9-12 & J9-4
of the I/O Board.
Option 12 – Soft Start Enable/Disable
S O F T S T A R T
E N A B L E D
This should only be enabled on European units with
soft start on two
compressors. This feature modifies
the compressor lead/lag to start the compressor(s)
furthest from the control panel last to minimize current
inrush. These compressors will be equipped with a soft
starter.
Soft start is only viewable under OP
-
TIONS key and must be programmed
from the Service Mode.
On two compressor chillers, soft start will always be
applied to the compressor farthest from the control
panel. This compressor will always start last to minimize
current inrush with the other compressor running.
C U R R E N T F E E D B A C K
O N E P E R U N I T
Lead/lag between systems may be selected to help
equalize average run hours between systems on
chillers with 2 refrigerant systems. Auto lead/lag
allows automatic lead/lag of the two systems based
on an average run hours of the compressors in each
system. A new lead/lag assignment is made whenever
all compressors shut down. The microprocessor will
then assign the “lead” to the system with the shortest
average run time.
Option 9 – Condenser Fan Control Mode
(YCAL0014-0080 Only)
Condenser fans are controlled by discharge pressure
only. This mode may only be chosen when discharge
pressure transducers are installed. YCAL0090 through
0134 are fixed in the fan control by discharge pressure
mode and cannot be reprogrammed.
or
F A N C O N T R O L
A M B I E N T & D S C H P R E S S
Condenser fans are controlled by ambient temperature
and discharge pressure. This mode must be chosen if the
discharge pressure transducers are NOT
installed.
Option 10 – Manual Override Mode
M A N U A L O V E R R I D E M O D E
D I S A B L E D
This option allows overriding of the daily schedule
that is programmed. Manual Override Mode – Disabled
indicates that override mode has no effect.
or
M A N U A L O V E R R I D E M O D E
E N A B L E D
Manual Override Mode is enabled. This is a service
function and when enabled, will allow the unit to
start when shut down on the daily schedule. It will
automatically be disabled after 30 minutes.
F A N C O N T R O L
D I S C H A R G E P R E S S U R E
Summary of Contents for YCAL0014E Series
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