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• Saturated Suction Temperature is computed by
converting suction pressure to temperature.
• Slide Valve Position is computed internally by an
algorithm in the micro based on % FLA motor current,
actual condensing temperature, and programmed
condensing temperature for a particular chiller model.
NOTE: Slide valve position is approximate.
• Superheat is computed by subtracting saturated
suction temperature from suction temperature.
Shown below are the 6 pressure / temperature displays
(Also see Sys 1 information on previous page):
S Y S
2
O I L =
S P =
5 9
D P =
S Y S
2
S U C
D S C H
O I L
T E M P 2
S A T
D I S H 2
S A T
S U C T 2
S Y S
2
S L I D E
P O S I T I O N
S Y S
2
S U P E R H E A T
Minimum and maximum limits on the displays are shown
below. When a minimum value is exceeded, a " < " sign
will appear before the numerical value. In the case of
maximum limits, exceeding them will cause a " > " sign to
appear.
NOTE: Minimum and maximum values may change as
software (EPROM) revisions are made.
MIN. LIMITS
OIL PRESSURE
208 PSID
SUCTION PRESSURE
0 PSIG (O BAR G) 199 PSIG (13.7 BAR G)
DISCHG. PRESSURE
0 PSIG (O BAR G) 399 PSIG (27.5 BAR G)
SUCTION TEMP.
**9.0°F (-12.8°C)
DISCHARGE TEMP.
40.3°F (4.6°C)
OIL TEMP.
40.3°F (4.6°C)
SAT. DISCHG. TEMP.
-41.0°F (-40.6°C)
SAT. SUCTION TEMP.
-41.0°F (-40.6°C)
SLIDE VALVE POS
SUPERHEAT
**-81.5°F (-63.1°C)
** NOTE: Below 9.0°F (-12.8°C), the Suction Temp. display will
disappear. This will in turn cause the Superheat display
to disappear.
78
5 2
P S I D
2 3 6
P S I G
=
4 3 . 5
° F
=
1 2 2 . 9
° F
=
8 7 . 3
° F
=
1 2 5 . 7
° F
=
2 9 . 2
° F
V A L V E
=
1 0 0 %
=
1 2 . 0
° F
MAX. LIMITS
0 PSID (O BARD)
84.2°F (29.0°C)
302.6°F (150.3°C)
240.0°F (115.6°C)
140.5°F (60.3°C)
101.3°F (38.5°C)
0%
100%
60.9°F (16.1°C)
% Motor Current
Compressor current in amps, % FLA, individual % FLA of
each phase, ISN current limit, EMS current limit, and ISN
lag compressor start % will be displayed when this key is
pressed. The key must be pressed 5 times to scroll
through the 5 displays related to motor current. An
example of each display is shown below along with an
explanation of its meaning.
C O M P 1 = A V G ; P H
1 0 0 ;
9 9 , 1 0 1 , 1 0 1
C O M P 2 = A V G ; P H
9 7 ;
9 7 ;
These two displays show the approximate average
current (% FLA) and the approximate % FLA of each
individual phase (L1, L2, and L3) on each compressor.
NOTE: Due to typical large variations in discharge
pressure, a compressor running "fully loaded"
may run over a wide range of currents and %
FLAs. Also, FLA is approximately equal to 1.2 x
RLA. This means amps equal to RLA of the
compressor will only be approximately 80% FLA.
I S N
C R N T
E M S
C R N T
Demand limit can be accomplished remotely by a YORK
ISN system or an external PWM (dry contact closure)
from an EMS system connected to the micro. This
display shows the % current limiting that may be in effect
from these devices.
I S N
L A G
C O M P R E S S O R
S T A R T
%
This display indicates the ISN programmed value of %
FLA of the lead compressor, where the lag compressor
will start. This is user selectable. The lower the value of
"START %", the less loaded the lead compressor will be
when the lag is called to start. See page 92 for more
information.
C O M P 1 = 2 8 1 A M P S 1 0 0 % F L A
C O M P 2 = 2 7 5 A M P S
This display provides a readout of the approximate % FLA
current as measured by the 3 C.T.s and the equivalent
approximate full load amps.
NOTE: Due to typical large variations in discharge
pressure, a compressor running "fully loaded"
may run over a wide range of currents and %
FLAs. Also, FLA is approximately equal to 1.2 x
RLA. This means amps equal to RLA of the
compressor will only be approximately 80% FLA.
% MOTOR
CURRENT
L , 1 , 2 , 3
% F L A
L , 1 , 2 , 3
9 7 ,
9 8
% F L A
L I M I T :
N O N E
L I M I T :
N O N E
N O N E
9 7 % F L A
YORK INTERNATIONAL
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