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Compressor Staging for Return Water Control – 6 Compressors
Cooling Setpoint = 45° F (7.2° C) Range = 10° F (5.6° C)
TABLE 33 – COMPRESSOR STAGING FOR RETURN WATER CONTROL
# OF COMP ON
0
45°F
RWT
(7.2°C)
*Unloading only
TABLE 34 – RETURN CHILLED LIQUID CONTROL FOR 6 COMPRESSORS (8 STEPS)
*STEP
COMPRESSOR ON POINT
0
1
2
SP + CR/6
3
SP + 2*CR/6
4
SP + 2*CR/6
5
SP + 3*CR/6
6
SP + 4*CR/6
7
SP + 5*CR/6
8
SP + CR
TABLE 35 – RETURN CHILLED LIQUID CONTROL FOR 4 COMPRESSORS (6 STEPS)
*STEP
COMPRESSOR ON POINT
0
1
2
SP + CR/4
3
SP + 2*CR/4
4
SP + 2*CR/4
5
SP + 3*CR/4
6
SP + CR
Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown.
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
*1+HG
1
46.25°F
46.7°F
(7.9°C)
(8.2°C)
COMPRESSOR OFF POINT
SETPOINT
SP + CR/8
SP + CR/6
SP + CR/6
SP + 2*CR/6
SP + 3*CR/6
SP + 4*CR/6
SP + 5*CR/6
COMPRESSOR OFF POINT
SETPOINT
SP + CR/8
SP + CR/4
SP + CR/4
SP + 2*CR/4
SP + 3*CR/4
2
3
48.3°F
50.0°F
51.7°F
(9.1°C)
(10.0°C)
(11.0°C)
FORM 150.62-NM2
4
5
6
53.4°F
55.0°F
(11.9°C)
(12.8°C)
SEE NOTE 1
SEE NOTE 2
SEE NOTE 3
SEE NOTE 1
SEE NOTE 2
SEE NOTE 3
2
83
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