York MILLENNIUM YCUL0045SC Installation Operation & Maintenance page 118

Unit Controls
Option 4 – Ambient Control Type
A B C D E F G H I J K L M N O P Q R S T
1 2 3 4 5 6 7 8 9 0 ° , . / % - ( ) * X
A M B I E N T
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
A B C D E F G H I J K L M N O P Q R S T
L O W A M B I E N T
1 2 3 4 5 6 7 8 9 0 ° , . / % - ( ) * X
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.
Option 5 – Local/Remote Control Type
L O C A L / R E M O T E
L O C A L
When programmed for LOCAL, an ISN or RCC control
can be used only to monitor. The micropanel 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
R E M O T E
This mode should be selected when an ISN or RCC con-
trol 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, 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 6 – Unit Control Mode
C O N T R O L
D I S C H A R G E
Unit control is based on discharge air temperature. This
mode of control will only be available if Condensing Unit
was selected under Option 3 - Unit Type.
118
C O N T R O L
C O N T R O L
M O D E L
M O D E
M O D E
A I R
C O N T R O L
S U C T I O N
This mode of control is based on suction pressure for
each individual system. This mode of control will only
be available if Condensing Unit was selected under Op-
tion 3 - Unit Type. It should be noted that this mode
of control requires suction transducers, which are
optional on some models, and field installed zone
thermostats.
Refer to section on Capacity Control for details on load-
ing and unloading sequences.
Option 7 – Units Type
D I S P L A Y
I M P E R I A L
Display messages will show units of measure in Impe-
rial units (°F or PSI).
– or –
D I S P L A Y
S I
Display messages will show units of measure in SI units
( ° C or Bar).
When Display Units are programmed for
SI, the readout on the display will be
"rounded" and not display the exact
value.
Option 8 – Lead/Lag Type (two systems only)
L E A D / L A G
M A N U A L S Y S
SYS 1 selected as lead compressor.
– or –
L E A D / L A G
M A N U A L S Y S
SYS 2 selected as lead compressor.
– or –
M O D E
P R E S S U R E
U N I T S
U N I T S
C O N T R O L
1 L E A D
C O N T R O L
2 L E A D
YORK INTERNATIONAL