JOHNSON CONTROLS
18
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
SECTION 1 - SYSTEM FUNDAMENTALS
Connections
The standard YZ chiller unit is designed for 1034
kPa (150 PSIG) working pressure in both, chilled
water circuits and condenser water circuits. The wa-
ter nozzle connections to these circuits are furnished
with grooves standardized to ANSI/AWWA C-606 for
shoulder joints. All water piping should be thoroughly
cleaned of all dirt and debris before final connections
are made to the chiller.
Chilled Water
A water strainer of maximum 3.2 mm (1/8") perfo-
rated holes must be field-installed in the chilled water
inlet line as close as possible to the chiller such that
the chilled water pump is protected by the strainer. The
strainer is important to protect the chiller from debris
or objects which could block flow through individu-
al heat exchanger tubes. A reduction in flow through
tubes could seriously impair the chiller performance or
even result in tube freeze-up. A flow switch is factory
installed in the evaporator nozzle and connected to the
OptiView panel, which assures adequate chilled water
flow during operation.
Condenser Water
The chiller is engineered for maximum efficiency at
both design and part load operation by taking advan-
tage of the colder cooling tower water temperatures
which occur during winter. Appreciable power sav-
ings are realized from these reduced heads. At initial
startup, entering condensing water temperature may
be 16.7°C (30°F) colder than the standby chilled water
temperature.
Summary of Contents for YZ MODEL A
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