FORM 160.75-EG1 (519)
JOHNSON CONTROLS
27
JOHNSON CONTROLS OPTISPEED™ DRIVE STARTER
When a YORK
®
YK chiller is equipped with a variable speed drive, it incorporates ad-
vanced Adaptive Capacity Control logic, which continually optimizes chiller operation. It
closely examines critical operating parameters, and then determines the most efficient
way to operate. In addition, it allows optimized savings when using intelligent control strat-
egies, such as chilled-water reset. Adaptive Capacity Control logic also accommodates
the characteristics of the refrigerant used in the chiller — today and tomorrow.
The variable speed drive was specifically developed for commercial air-conditioning ap-
plications. No one matches Johnson Controls experience in the application of variable
speed drive technology to chillers. Since pioneering the concept in 1978, Johnson Con-
trols has installed more variable speed drive chillers than all other chiller manufacturers
combined.
Variable speed drives save in both single-chiller installations and multiple-chiller installa-
tions. In multiple-chiller installations, cycling chillers off as the building load falls will result
in higher loads on the remaining chillers. This would seem to reduce the opportunity for
drives to save energy. However, even though chiller loads remain high, entering con-
denser-water temperature has most likely fallen. Reductions in entering condenser water
temperature offer a far greater potential to enhance chiller efficiency than load reductions
do. Therefore, a variable speed drive delivers major energy savings in multiple-chiller
plants, too.
The OptiSpeed Drive is available for low and medium voltage options for the compressor
motor (See Table 1).
TABLE 1 - OPTISPEED DRIVE STARTER OPTION
LOW VOLTAGE STARTERS
60 HZ 50 HZ
OPTISPEED
VARIABLE SPEED
DRIVE
UNIT MOUNTED
380V 460V 575V 600V 380V 400V 415V
X X X X X X X –
60 HZ MEDIUM VOLTAGE STARTERS
OPTISPEED
VARIABLE SPEED
DRIVE
FLOOR MOUNTED
2300V 3300V 4000V 4160V 6000V 6600V 12470V 13800V
X X X X O O O O
50 HZ MEDIUM VOLTAGE STARTERS
OPTISPEED
VARIABLE SPEED
DRIVE
FLOOR MOUNTED
2300V 3000V 3300V 6000V 6600V 10000V 11000V
– – X O O O O –
X=Available
O=Available by Special Quotes (SQ)
Accessories and Modifications
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