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TABLE 31 – LEAVING CHILLED LIQUID CONTROL FOR 3 COMPRESSORS (SINGLE SYSTEM)
*STEP
COMP 1
0
OFF
1
ON+HG
2
ON
3
ON
4
ON
TABLE 32 – LEAVING CHILLED LIQUID CONTROL FOR 2 COMPRESSORS (SINGLE SYSTEM)
*STEP
COMP 1
0
OFF
1
ON+HG
2
ON
3
ON
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
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.
YORK INTERNATIONAL
COMP 2
COMP 3
OFF
OFF
OFF
OFF
SEE NOTE 1
OFF
OFF
ON
OFF
ON
ON
COMP 2
OFF
OFF
SEE NOTE 1
OFF
ON
FORM 150.62-NM2
2
81
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