Carrier 19 Series - Manual (Page 5)

Solid state capacity control
The capacity control module offers
solid state compactness and reliability,
with smooth and precise capacity mod­
ulation from 100% to 10% of full load,
without hot gas bypass. It is more
efficient in maintaining leaving water
temperatures than any other type of
control. The convenient, centrally
located control center provides fully
automatic machine operation, com­
plete with a full complement of safety
interlocks. Check operating status at a
glance, easily monitor all system oper­
ating points. The highly sensitive,
factory-installed thermistor probe, solid
state amplifier, and guide vane actuator
are precisely matched and fully re­
sponsive to changes in leaving chilled
water temperature. They help to main­
tain your selected design temperature
throughout all operating load condi­
tions. The result is efficient, trouble-free
operation with longer life expectancy.
All control connections can be made
quickly to a single terminal strip; and
once the solid state control has been
19FA
calibrated, control settings may be
changed
without additional field
calibration.
19EB
55 F (13 C) condenser water
The Carrier metered refrigerant design
allows the 19 Series chillers to operate
efficiently with condenser water tem­
perature as low as 55 F (13 C) without
condenser water bypass or mixing
tanks. The 55 F (13 C) condenser water
means reduced head pressures which in
turn means lower horsepower require­
ments The end result is lower energy
costs and lower annual operating costs.
In addition, the absence of a condenser
water bypass and mixing tanks add up
to lower first costs and lower installation
costs.
LZZZ
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Compressor-motor-
heat exchanger mix-match
Each model within the 19 Series line
has the capability of mix-matching
various heat exchanger sizes with an
array of compressor-motor combina­
tions. As illustrated, mix-matching
allows you to mount a small capacity
compressor on a large heat exchanger.
This design concept optimizes specified
conditions, improving full and part load
performance.