JOHNSON CONTROLS
FORM 160.75-EG1 (519)
42
Application Data (Cont'd)
MULTIPLE UNITS
Selection – Many applications require multiple units to meet the total capacity require-
ments as well as to provide flexibility and some degree of protection against equipment
shutdown. There are several common unit arrangements for this type of application. The
YK chiller is designed to be readily adapted to the requirements of these various arrange-
ments.
Parallel Arrangement (Figure 2 - Parallel Evaporators Parallel Condensers on page
42) – Chillers may be applied in multiples with chilled and condenser water circuits
connected in parallel between the units. Figure 2 represents a parallel arrangement with
two chillers. Parallel chiller arrangements may consist of equally or unequally sized units.
When multiple units are in operation, they will load and unload at equal percentages of
design full load for the chiller.
COND. 1
COND. 2
EVAP. 1
EVAP. 2
LD18370
FIGURE 2 - PARALLEL EVAPORATORS PARALLEL CONDENSERS
EVAP.1
EVAP.2
T
S1
S2
COND. 1
COND. 2
FIGURE 3 - SERIES EVAPORATORS PARALLEL CONDENSERS
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