York YCAS Series Installation Operation & Maintenance page 186

Micro Panel Contents
The Pilot Solenoid is also used as a low su per heat safety
de vice when EEV is selected as the ex pan sion valve
type, for YCAL units only. While the sys tem is run ning
and not in a pumpdown mode the Pilot So le noid will
close if the suction su per heat falls be low 4.0ºF (2.2ºC).
The Pilot Solenoid will open again when the su per heat
ris es above 7.0ºF (3.9ºC). This safe ty de vice is ignored
for the fi rst 30 sec onds of sys tem run time. If the Pilot
Solenoid is closed 10 times in 2 min utes on the safe ty
de vice, the low su per heat safe ty will be trig gered.
LOW SUPERHEAT CUTOUT SAFETY
The Low Superheat Cutout is to protect the com pres sors
from liquid fl oodback due to low suc tion su per heat. This
safety is only active when EEV is selected as the expan-
sion valve type. This safe ty is ignored for the fi rst 30
seconds of system run time.
This safety can be triggered by two events. The fi rst is
when the suction superheat is less than 2.0ºF (1.1ºC) for
3 seconds. The second, only applies to YCAL units, is
when the Pilot Solenoid is closed 10 times in 2 min utes
due to low superheat. Fol low ing are the safety fault mes-
sag es for all sys tems:
S Y S 1 L O W
S Y S 2 L O W
SENSOR FAILURE CUTOUT SAFETY
The Sensor Failure Cutout is to prevent the EEV from
running when the sensors measuring su per heat are not
functioning properly. This safety is only active when
EEV is selected as the expansion valve type. This safe ty
is ignored for the fi rst 15 seconds of system run time.
This safety will shutdown a system if either suc tion tem-
per a ture or suction pressure sensors read out of range
high or low. This condition must be present for 3 sec onds
to cause a system shut down. This safety will lock out a
system the fi rst time and will not allow automatic restart-
ing. Fol low ing are the messages for all systems:
S Y S 1 S E N S O R
S Y S 2 S E N S O R
186
S U P E R H E A T
S U P E R H E A T
F A I L U R E
F A I L U R E
OPERATING DATA DISPLAYS
The following display relating to EEV operation is avail-
able under each systems Data Key: EEV Output% and
Suction Superheat.
S Y S X E E V
S U C T S H E A T
HISTORY DATA DISPLAYS
The following display relating to EEV operation is avail-
able under each systems Data Key: EEV Output% and
Suction Superheat.
S Y S X E E V
S U C T S H E A T
OPERATING DATA PRINTOUT
Pressing the PRINT key and then the OPER DATA key
allows the operator to obtain a printout of cur rent sys tem
operating parameters. When the OPER DATA key is
pressed, a snapshot will be taken of system operating
conditions and panel programming selections. This data
will be tem po rari ly stored in memory and transmission
of this data will begin to the printer. The following items
are added to the standard operational data print out when
EEV is selected:
SYSTEM 1 DATA
COMPRESSORS STATUS
RUN TIME 0- 0- 0- 0 D-H-M-S
MOTOR CURRENT
SUCTION PRESSURE
DISCHARGE PRESSURE
OIL PRESSURE
FAN DISCHARGE PRESS
SUCTION TEMPERATURE
DISCHARGE TEMPERATURE
OIL TEMPERATURE
SAT SUCTION TEMP
SUCTION SUPERHEAT
SAT DISCHARGE TEMP
DISCHARGE SUPERHEAT
SLIDE VALVE STEP
EEV OUTPUT
COOLER INLET REFRIG
LIQUID LINE SOLENOID
ECONOMIZER TXV SOLENOID
OIL COOLING SOLENOID
HEAT RECOVERY SOLENOID
DISCHARGE COOLING SOLENOID
CONDENSER FAN STAGE
COMPRESSOR HEATER
WYE-DELTA RELAY
FORM 201.19-NM8 (804)
= X X X . X %
= X X X . X º F
= X X X . X %
= X X X . X º F
OFF
0 AMPS 0 %FLA
125 PSIG
131 PSIG
130 PSIG
254 PSIG(B HR)
68.4 DEGF
68.8 DEGF
68.8 DEGF
71.8 DEGF
3.4 DEGF
74.5 DEGF
6.3 DEGF
0
0.0 %(EEV)
44.6 DEGF
OFF
OFF(YCAS)
OFF(YCWS)
OFF(B HR)
OFF(EC,LT)
OFF
ON
OFF
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