YORK INTERNATIONAL
FORM 150.63-NM1
123
Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown. For Dis-
charge Air Temperature Control the Hot Gas Bypass solenoid is energized only when the lead compressor is running and the DAT <
SP, the Hot Gas Bypass solenoid is turned off when the DAT > 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 20 – DISCHARGE AIR TEMPERATURE CONTROL FOR 2 COMPRESSORS (SINGLE SYSTEM)
3
TABLE 19 – DISCHARGE AIR TEMPERATURE CONTROL FOR 3 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
Содержание MILLENNIUM YCUL0016SC
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