FORM 201.25-NM1 (302)
49
YORK INTERNATIONAL
Examples of these displays are as follows where # is
the appropriate system number:
Temperatures and pressures are either measured directly
by transducers and sensors, or computed from these
measurements as follows:
Differential oil pressure is the pressure difference be-
tween oil leaving the discharge oil separator and oil
pressure reaching the compressor. It is calculated by
subtracting oil pressure measured after the oil line fil-
ter from discharge pressure (oil in the oil separator is
at discharge pressure). Typically for a clean oil filter
the drop will be 1.5 to 10 psi (0.1 to 0.7 bar) but may
reach up to 44 psi (3 bar).
Saturated discharge and suction temperatures are calcu-
lated by converting measured pressure to temperature.
Slide valve position is calculated based on the number
of loading steps that the microprocessor has sent to the
slide valve solenoid as a current signal.
Slide valve position is approximate
and should be used for reference only.
Under many conditions, it will be fully
loaded between step 60 to 75 and fully
unloaded between step 0 to 40.
Superheats are the difference between the respective
saturated temperature (converted from pressure) and
the actual.
Display limits for the system pressures and tempera-
tures displays are as follows:
4.4 AMBIENT TEMP KEY
When the key is pressed, ambient air temperature, as
measured surrounding the chiller, is displayed.
Display Limits: Minimum -4.6°F
(-20.3°C)
Maximum 137.9°F (58.8°C)
4.5 MOTOR CURRENT KEY
Pressing the key displays compressor current for each
system:
This display shows the average motor current in amps
and average compressor motor current as a percentage
of FLA. All values are approximate.
On the second press of the of the key, the current limit
values as set by the ISN (Remote BAS System) and
EMS-PWM current limiting input are displayed, if they
are active.
S #
S A T
D S C H = 1 3 0 . 0 ° F
D S C H
S H E A T
=
5 4 . 3 ° F
S Y S
#
S
V
S T E P
=
3
S Y S
#
C O O L E R
I N L E T
R E F R I G
T E M P =
2 8 . 2 ° F
S Y S
#
O I L =
1 7 6
P S I G
S P = 6 4
D P = 1 9 5
P S I G
S Y S
#
O I L
=
1 5 7 . 4 ° F
S T =
3 1 . 0
D T =
1 2 3 . 2 ° F
S #
S A T
S U C T
=
3 2 . 9 ° F
S U C T
S H E A T
=
1 5 . 0 ° F
A M B I E N T
A I R
T E M P
=
7 1 . 9
° F
C O M P
# = 1 8 6
A M P
1 0 0 % F L A
C O M P
# = 1 3 5
A M P
9 9 % F L A
I S N
C R N T
L I M I T :
N O N E
E M S
C R N T
L I M I T :
N O N E
MINIMUM
MAXIMUM
LIMIT
LIMIT
OIL PRESSURE
208 PSID (0 BAR)
0 PSID (14 BAR)
SUCTION PRESSURE
0 PSIG (0 BAR) 199 PSIG (14 BAR)
DISCHARGE PRESSURE
0 PSIG (0 BAR) 399 PSIG (28 BAR)
SUCTION TEMPERATURE*
*9°F (-13°C)
84.2°F
(29°C)
DISCHARGE TEMPERATURE
40.3°F
(5°C)
302.6°F
(150°C)
OIL TEMPERATURE
40.3°F
(5°C)
240.0°F
(116°C)
SATURATED DISCH. TEMP.
-41.0°F (-41°C)
140.5°F
(60°C)
SATURATED SUCT. TEMP.
-41.0°F (-41°C)
101.3°F
(39°C)
SLIDE VALVE POSITION
0%
(0%)
100%
(100%)
SUCTION SUPERHEAT*
*-81.5°F (-63°C)
60.9°F
(16°C)
DISCHARGE SUPERHEAT
22.5°F (-5.3°C)
216.0°F (102.2°C)
NOTES:
1. *Below 9°F (13°C) the Suction Temperature display will disappear.
2. This will in turn cause the Suction Superheat display to disappear.
3. Minimum and maximum values may change as software (EPROM)
revisions are made.
TABLE 5 –
DISPLAY LIMITS
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