Specifications

27
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
4
LD15051
FIGURE 9 - SUGGESTED LAYOUT FOR
APPLICATIONS WITH A FLOW RATE
GREATER THAN THE EVAPORATOR
MAXIMUM ALLOWABLE FLOW RATE
BYPASS
SUPPLY TO LOAD
LOAD
THERMAL STORAGE
Thermal storage is the practice of storing cooling energy
during a period of little or no load and/or low energy
costs for use during periods of high load and/or energy
costs. Conventional cooling systems produce cooling
when it is needed which is commonly during times of
peak demand. Thermal storage allows generation of
cooling capacity to occur during off-peak periods and
store that capacity to meet future cooling requirements.
Using thermal storage can result in smaller equipment
sizes, thereby reducing capital cost, and also can result
in significant energy cost savings
The YVAA has special control logic to be able to
produce chilled leaving brine temperatures below 4.4°C
(40°F) so as to supply a storage tank with chilled liquid
during times of low demand. YVAA chillers selected
for thermal storage operation can also be selected to
efficiently provide chilled fluid at nominal cooling loads.
VARIABLE PRIMARY FLOW
Johnson Controls recommends a maximum 10% per
minute flow rate of change, based on design flow, for
variable primary flow applications. Provide 8 to 10
gallons per chiller ton (8.6 to 10.8 liter per cooling KW)
system water volume. Insufficient system volume and
rapid flow changes can cause control problems or can
even cause chiller shutdowns. There are many other
design issues to evaluate with variable primary flow
systems. Consult your Johnson Controls Sales Office
for more information about successfully applying YVAA
chillers.
CONNECTION TYPES AND SIZES
For connection sizes relevant to individual models refer
to the Section 5 - Technical Data.
COOLER CONNECTIONS
Standard chilled liquid connections on all coolers are of
the Victaulic Groove type.
FIGURE 10 - VICTAULIC GROOVE
LD10494
Option Flanges
One of two types of flanges may be fitted depending on
the customer or local pressure vessel code requirements.
These are Victaulic-Adapter flanges, normally supplied
loose, or weld flanges, which may be supplied loose
or ready-fitted. Victaulic-Adapter and weld flange
dimensions are to ISO 7005 - NP10.
FIGURE 11 - FLANGE ATTACHMENT
LD10495
WELD FLANGE VICTAULIC ADAPTER