FORM 160.84-EG1 (617)
JOHNSON CONTROLS
9
Ratings (Cont'd)
The chiller is engineered for maximum efficiency at both design and part-load operation by taking
advantage of the colder cooling tower water temperatures which naturally occur during the winter
months. Appreciable power savings are realized from these reduced heads.
The minimum entering condenser water temperature for other full and part-load conditions is provided
by the following equation:
where:
ECWT = entering condensing water temperature
LCHWT = leaving chilled water temperature
At initial startup, entering condensing water temperature may be as much as 30°F (16.66°C) colder
than the standby chilled water temperature.
Min ECWT = LCHWT -30°F (16.66°C)
LD22432
Part-load information can be easily and accurately generated by a computer. And because it is so im-
portant to an owner’s operating budget, this information has now been standardized within the AHRI
Certification Program in the form of an Integrated Partload Value (IPLV), and Non-Standard Partload
Value (NPLV).
A more detailed analysis must take into account actual building load profiles, and local weather data.
Part-load performance data should be obtained for each job using its own design criteria.
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