Micro Panel Contents
The Pilot Solenoid is also used as a low superheat safety device when EEV is selected as the expansion valve type, for YCAL units only. While the system is running and not in a pumpdown mode the Pilot Solenoid will close if the suction superheat falls below 4.0º F. The Pilot Solenoid will open again when the superheat rises above 7.0º F. This safety device is ignored for the first 30 seconds of system run time. If the Pilot Solenoid is closed 10 times in 2 minutes on the safety device, the low superheat safety will be triggered.
LOW SUPERHEAT CUTOUT SAFETY
The Low Superheat Cutout is to protect the compressors from liquid floodback due to low suction superheat. This safety is only active when EEV is selected as the expan- sion valve type. This safety is ignored for the first 30 seconds of system run time.
This safety can be triggered by two events. The first is when the suction superheat is less than 0.5º F (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. Following are the safety fault messages for all systems:
S Y S | 1 | L O W | S U P E R H E A T |
S Y S | 2 | L O W | S U P E R H E A T |
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SENSOR FAILURE CUTOUT SAFETY
The Sensor Failure Cutout is to prevent the EEV from running when the sensors measuring superheat are not functioning properly. This safety is only active when EEV is selected as the expansion valve type. This safety is ignored for the first 15 seconds of system run time.
This safety will shutdown a system if either suction tem- perature or suction pressure sensors read out of range high or low. This condition must be present for 3 seconds to cause a system shutdown. This safety will lock out a system the first time and will not allow automatic restart- ing. Following are the messages for all systems:
S Y S | 1 | S E N S O R | F A I L U R E |
S Y S | 2 | S E N S O R | F A I L U R E |
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FORM
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 = X X X . X %
S U C T S H E A T = X X X . X º F
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 = X X X . X %
S U C T S H E A T = X X X . X º F
OPERATING DATA PRINTOUT
Pressing the PRINT key and then the OPER DATA key allows the operator to obtain a printout of current system 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 temporarily stored in memory and transmission of this data will begin to the printer. The following items are added to the standard operational data printout when EEV is selected:
SYSTEM 1 DATA |
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COMPRESSORS STATUS |
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| OFF |
RUN TIME | 0- 0- 0- 0 | ||
MOTOR CURRENT |
| 0 AMPS 0 | %FLA |
SUCTION PRESSURE |
| 125 | PSIG |
DISCHARGE PRESSURE |
| 131 | PSIG |
OIL PRESSURE |
| 130 | PSIG |
FAN DISCHARGE PRESS |
| 254 | PSIG(B HR) |
SUCTION TEMPERATURE |
| 68.4 | DEGF |
DISCHARGE TEMPERATURE | 68.8 | DEGF | |
OIL TEMPERATURE |
| 68.8 | DEGF |
SAT SUCTION TEMP |
| 71.8 | DEGF |
SUCTION SUPERHEAT |
| 3.4 | DEGF |
SAT DISCHARGE TEMP |
| 74.5 | DEGF |
DISCHARGE SUPERHEAT |
| 6.3 | DEGF |
SLIDE VALVE STEP |
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| 0 |
EEV OUTPUT |
| 0.0 %(EEV) | |
COOLER INLET REFRIG |
| 44.6 | DEGF |
LIQUID LINE SOLENOID |
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| OFF |
ECONOMIZER TXV SOLENOID |
| OFF(YCAS) | |
OIL COOLING SOLENOID |
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| OFF(YCWS) |
HEAT RECOVERY SOLENOID |
| OFF(B HR) | |
DISCHARGE COOLING SOLENOID | OFF(EC,LT) | ||
CONDENSER FAN STAGE |
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| OFF |
COMPRESSOR HEATER |
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| ON |
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| OFF | |
174 | YORK INTERNATIONAL |
