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JOHNSON CONTROLS
110
FORM 150.63-NM6 (1020)
Unit Controls
TABLE 22
– DISCHARGE AIR TEMPERATURE CONTROL FOR 5 AND 6 COMPRESSORS (7 AND 8 STEPS)
TABLE 23
– DISCHARGE AIR TEMPERATURE CONTROL FOR 4 COMPRESSORS (6 STEPS)
LEAD SYSTEM
LAG SYSTEM
*STEP
COMP 1
COMP 2
COMP 3
COMP 1
COMP 2
COMP 3
0
OFF OFF OFF
OFF OFF OFF
1
ON+HG
OFF
OFF
SEE NOTE 1
OFF
OFF
OFF
2
ON OFF OFF
OFF OFF OFF
3
ON
OFF
OFF
SEE NOTE 2
ON
OFF
OFF
4
ON
ON
OFF
SEE NOTE 3
OFF
OFF
OFF
5
ON ON OFF
ON OFF OFF
6
ON ON OFF
ON ON OFF
7
ON ON ON
ON ON OFF
8
ON ON ON
ON ON ON
LEAD SYSTEM
LAG SYSTEM
*STEP
COMP 1
COMP 2
COMP 1
COMP 2
0
OFF OFF OFF OFF
1
ON+HG
OFF
SEE NOTE 1
OFF
OFF
2
ON
OFF OFF
OFF
3
ON
OFF
SEE NOTE 2
ON
OFF
4
ON
ON
SEE NOTE 3
OFF
OFF
5
ON
ON ON
OFF
6
ON ON ON ON
* STEP can be viewed using the OPER DATA key and scrolling to COOLING DEMAND.
Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown. For Discharge 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.
Summary of Contents for YCUL0045
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