Refrigerant Storage/Recycling System; High Ambient Temperature; Optisound Control - York YK Manual

FORM 160.75-EG1 (519)
Accessories and Modifications (Cont'd)

REFRIGERANT STORAGE/RECYCLING SYSTEM

A refrigerant storage/recycling system is a self-contained package consisting of a refriger-
ant compressor with oil separator, storage receiver, water-cooled condenser, filter drier
and necessary valves and hoses to remove, replace and distill refrigerant. All necessary
controls and safety devices are a permanent part of the system. A storage receiver is typi-
cally not required if optional unit isolation valves are provided.

HIGH AMBIENT TEMPERATURE

Chiller modifications are available to allow for installation in high ambients of up to 122°F
(50°C). Special drive motors are required above 104°F (40°C). H9 and K compressor
evaporator design pressures must be increased for ambient temperatures above 112.8°F
(45°C). The OptiView™ panel and low voltage VSD are suited for 122°F (50°C) ambient.
Low and medium voltage Solid-State Starters must be derated and/or modified above
110°F (43.3°C). The free standing MVVSD option must be derated above its standard
104°F (40°C) limit.
OPTISOUND™ CONTROL
The YORK OptiSound™ Control is a patented combination of centrifugal-chiller hard-
®
ware and software that reduces operational sound levels, expands the chiller operating
range, and improves chiller performance. The OptiSound™ Control feature continuously
monitors the characteristics of the compressor-discharge gas and optimizes the diffuser
spacing to minimize gas-flow disruptions from the impeller. This innovative technology
improves operating sound levels of the chiller an average of 7 dBA, and up to 13 dBA
on the largest models. It can also reduce part-load sound levels below the full-load level.
In addition, the OptiSound™ Control provides the benefit of an expanded operating range.
It improves performance and reliability by minimizing diffuser-gas stall at off-design opera-
tion, particularly conditions of very low load combined with little or no condenser-water re-
lief. The elimination of the gas-stall condition can also result in improved chiller efficiency
at off-design conditions.
Johnson Controls recommends the OptiSound™ Control for chiller applications with el-
evated entering condenser-water temperatures (high-head) or applications requiring low-
load operation with constant condenser temperature. At high-head conditions, improved
chiller operation is visible at all load points.
OptiSound™ Control Availability
Standard: Compressors P8, P9, H9, K1, K2, K3, K4, K7
Optional: Compressors Q3, Q4, Q5, Q6, Q7, P7
JOHNSON CONTROLS 37