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YORK INTERNATIONAL
86
FIG. 6 – LEAVING WATER TEMPERATURE CONTROL
TABLE 32 – LEAVING CHILLED LIQUID CONTROL FOR 6 COMPRESSORS (8 STEPS)
TABLE 33 – LEAVING CHILLED LIQUID CONTROL FOR 4 COMPRESSORS (6 STEPS)
20 sec. 30 sec. 60 sec. control range 60 sec.
unloading unloading unloading (no compressor staging) loading
42.5°F 43.5°F 44.0°F 46.0°F 48.0°
(5.8°C) (6.4°C) (6.7°C) (7.8°C) (8.9°C)
Low Limit Setpoint High limit
Leaving Water Temp. Control – Compressor Staging
Setpoint = 46.0°F (7.8°C) Range = +/- 2°F(1.1°C)
LWT
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.
Unit Controls