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Micro Panel Contents
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:
S Y S
#
O I L =
S P =
6 4
D P =
S Y S
#
O I L
S T =
3 1 . 0
D T =
S #
S A T
S U C T
S U C T
S H E A T
S #
S A T
D S C H =
D S C H
S H E A T
S Y S
#
S
V
S Y S
#
C O O L E R
R E F R I G
T E M P =
The Cooler Inlet Temp. display will
only appear if the chiller is selected for
R407C.
Temperatures and pressures are either measured directly
by transducers and temperature sensors, or computed
from these measurements as follow:
Differential oil pressure is the pressure difference be-
tween oil leaving the discharge oil separator and oil
pressure reaching the compressor. It is computed by sub-
tracting oil pressure measured after the oil line filter
from discharge pressure (oil in the oil separator is at
discharge pressure.). Typically for a clean oil filter the
drop will be 0.1 - 0.7 bar (2 - 10 PSID) but may reach
up to 3 bar (40 PSID).
Saturated discharge and suction temperatures are com-
puted by converting measured pressure to temperature.
120
0 . 3
B A R
1 3 . 4
B A R
=
6 9 . 7 ° C
5 0 . 7 ° C
=
0 . 5 ° C
=
8 . 3 ° C
5 4 . 4 ° C
=
3 0 . 2 ° C
S T E P
=
3
I N L E T
– 2 . 1 ° C
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 equals fully unloaded and step 75
equals fully loaded.
Slide valve position is approximate and
should be used for reference only.
Under actual conditions, the compres-
sor may be fully loaded between step
60 -75 and fully unloaded between step
0 -40.
Superheats are the difference between the respective
saturated temperature (converted from pressure) and the
actual. Display Limits for the System Pressures and
Temperatures displays are as follows:
MIN. LIMIT
Oil Pressure
14 bar (208 PSID)
Suction Pressure
0 bar
Discharge Pressure
0 bar
Suction Temp.
*-13.0°C
Discharge Temp.
5°C
Oil Temp.
5°C
Sat. Discharge Temp.
-41.0°C
Sat. Suction Temp.
-41.0°C
Slide Valve Position
0
Suction Superheat
-35.3°C
Discharge Superheat
5.3°C
Minimum and maximum values may
change as software (EPROM) revi-
sions are made.
*Below 13°C (9.0°F), 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.
A M B I E N T
=
2 2 . 2
Display Limits: Minimum = -20.3°C
Maximum =
MAX. LIMIT
0 bar
(0 PSID)
(0 PSIG)
14 bar (199 PSIG)
(0 PSIG)
28 bar (399 PSIG)
(9.0°F)
29°C
(84.2°F)
(40.3°F)
150°C
(302.6°F)
(40.3°F)
116°C
(240.0°F)
(-41°F)
60°C
(140.5°F)
(-41°F)
39°C
(101.3°F)
75
(37.4°F)
16°C
(60.9°F)
(22.5°F)
102°C
(216°F)
A I R
T E M P
° C
(-4.6°F)
58.8°C (137.9°F)
YORK INTERNATIONAL
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