157
YORK INTERNATIONAL
FORM 201.18-NM3
Slide valve position is APPROXI-
MATE and should be used for refer-
ence only. Under actual conditions the
compressor may be fully loaded be-
tween step 60 - 75 and fully unloaded
between step 0 - 40.
Superheats are the difference between the respective satu-
rated temperature (converted from pressure) and the ac-
tual. Display Limits for the System Pressures and Tem-
peratures displays are as follows:
Minimum and maximum values may
change as software (EPROM) revi-
sions are made.
*Below 9.0°F (13°C), the Suction
Temp. display will disappear. This will
in turn cause the Superheat display to
disappear.
3.4
AMBIENT TEMP KEY
When the Ambient Temperature key is pressed, ambi-
ent 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)
3.5
MOTOR CURRENT KEY
Pressing the Motor Current key displays compressor
current for each system:
3.3
SYSTEM # DATA KEYS
Pressing one of the System # Data keys a number of
times scrolls through displays of differential oil pres-
sure (OIL), suction pressure (SP) and discharge pres-
sure (DP), oil temperature, suction temperature (ST),
discharge temperature (DT), saturated suction tempera-
ture, suction superheat, saturated discharge tempera-
ture, discharge superheat and compressor slide valve
position.
Examples of these displays are as follows where # is
the appropriate system number:
The Cooler Inlet Temp. display will
only appear if the chiller is selected for
R-407c.
Temperatures and pressures are either measured directly
by transducers and temperature sensors, or computed
from these measurements as follows:
Saturated discharge and suction temperatures are com-
puted by converting measured pressure to temperature.
Slide Valve Position is computed based on the number
of loading steps that the micro has sent to the slide valve
solenoid in the form of a current signal. To the micro-
processor, STEP 0 = fully unloaded and STEP 75 =
fully loaded.
A M B I E N T
A I R
T E M P
=
7 1 . 9
° F
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
MIN. LIMIT
MAX. LIMIT
Oil Pressure
208 psid
(14 bar)
0 psid
(0 bar)
Suction Pressure
0 psig
(0 bar)
199 psig
(14 bar)
Discharge Pressure
0 psig
(0 bar)
399 psig
(28 bar)
Suction Temp.
*9.0 °F
(-13°C)
84.2 °F
(29°C)
Discharge Temp.
40.3 °F
(5°C)
302.6 °F
(150°C)
Oil Temp.
40.3 °F
(5°C)
240.0 °F
(116°C)
Sat. Discharge Temp.
-41.0 °F
(-41°C)
140.5 °F
(60°C)
Sat. Suction Temp.
-41.0 °F
(-41°C)
101.3 °F
(39°C)
Slide Valve Position
0%
(0%)
100%
(100%)
Suction Superheat
*-81.5 °F (-63.1°C)
60.9 °F
(16°C)
Discharge Superheat
22.5 °F
(-5.3°C)
216.0 °F (102.2°C)
8
Summary of Contents for MILLENNIUM YCAS 250
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