YORK INTERNATIONAL
91
FORM 150.62-NM7 (103)
Option 4 – Ambient Control Type:
(YCAL00043-00253 Only)
The low ambient cutout is adjustable from 25°F to 60°F
(-3.9°C to 15.6°C).
or
The low ambient cutout is programmable down to 0°F
(-17.8°C). A low ambient kit MUST be in stalled for
this option to be chosen. If the kit is NOT in stalled,
and low ambient is selected, low pressure faults and
compressor damage may occur. YCAL0287-0377 are
fi xed in the low ambient mode as standard and can-
not be reprogrammed.
Option 5 – Local/Remote Control Type:
When programmed for LOCAL, an ISN or RCC con trol
can be used to mon i tor only. The micro panel will op er ate
on locally pro grammed values and ignore all com mands
from the remote devices. The chiller will com mu ni cate
and send data to the remote monitoring de vic es.
or
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 fol low ing items: Re mote
Start/Stop, Cooling Setpoint, Load Limit, and His to ry
Buffer Re quest. If the unit re ceives no valid ISN trans-
mis sion for 5 minutes, it will revert back to the lo cal ly
pro grammed val ues.
Option 6 – Unit Control Mode:
Unit control is based on return chilled liquid temp. Re turn
Chilled Liquid Control can only be selected on units that
have 4 to 6 com pres sors (dual system units).
or
Unit control is based on leaving chilled liquid temp.
Refer to section on Capacity Control for details on load-
ing and unloading sequences.
L O C A L / R E M O T E M O D E
R E M O T E
A M B I E N T C O N T R O L
L O W A M B I E N T
L O C A L / R E M O T E M O D E L
L O C A L
C O N T R O L M O D E
R E T U R N L I Q U I D
C O N T R O L M O D E
L E A V I N G L I Q U I D
A M B I E N T C O N T R O L
S T A N D A R D
2
Option 7 – Display Units:
This mode displays system operating values in Im pe ri al
units of °F or PSIG.
or
This mode displays system operating values in Sci en tifi c
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
SYS 2 selected as lead compressor.
or
Lead/lag between systems may be selected to help
equal ize average run hours between systems on chill-
ers with 2 re frig er ant systems. Auto lead/lag allows auto-
matic lead/lag of the two systems based on an average
run hours of the compressors in each system. A new
lead/lag as sign ment is made whenever all compressors
shut down. The mi cro will then assign the “lead” to the
sys tem with the shortest average run time.
Option 9 – Condenser Fan Control Mode
(YCAL0043-0253 Only):
Condenser fans are controlled by discharge pressure
only. This mode may only be chosen when discharge
pressure transducers are installed. YCAL0287-0377 are
fi xed in the fan control by discharge pressure mode and
can not be reprogrammed.
or
D I S P L A Y U N I T S
I M P E R I A L
D I S P L A Y U N I T S
S I
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
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
L E A D / L A G C O N T R O L
A U T O M A T I C
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
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