York YCAL0080SC Manuale Utente
YORK INTERNATIONAL
87
FORM 150.62-NM1
Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown. For Leaving
Chilled Liquid Control the Hot Gas Bypass solenoid is energized only when the lead compressor is running and the LWT < SP, the Hot Gas
Bypass solenoid is turned off when the LWT > SP + CR/2
Bypass solenoid is turned off when the LWT > SP + CR/2
2. Step 3 is skipped when loading occurs.
3. Step 4 is skipped when unloading occurs.
* STEP can be viewed using the OPER DATA key and scrolling to COOLING DEMAND.
TABLE 34 – LEAVING CHILLED LIQUID CONTROL FOR 3 COMPRESSORS (SINGLE SYSTEM)
TABLE 35 – LEAVING CHILLED LIQUID CONTROL FOR 2 COMPRESSORS (SINGLE SYSTEM)
*STEP
COMP 1
COMP 2
COMP 3
0
OFF
OFF
OFF
1
ON+HG
OFF
OFF
SEE NOTE 1
2
ON
OFF
OFF
3
ON
ON
OFF
4
ON
ON
ON
*STEP
COMP 1
COMP 2
0
OFF
OFF
1
ON+HG
OFF
SEE NOTE 1
2
ON
OFF
3
ON
ON
2