Description of Electrical Controls
(Continued)
Low Pressure Switch: The low pressure switch is an automatic
reset that senses compressor suction line pressure. In early
production models, it opens at 40 PSIG and control closes at 80
PSIG. In the latest productions models, it opens at 10 PSIG and
control closes at 25 PSIG.
Flow Switch: The flow switch senses liquid solution flow. The
paddle of the switch is inserted through a fitting into the pump
discharge line. Liquid solution flow deflects the paddle and
closing the switch. The flow switch is position sensitive. The
arrow ā on the switch must point in the direction of liquid
solution flow. Maximum flow is not to exceed 14.4 GPM
Compressor Contactor: The compressor contactor energizes
the compressor through the two or three normally open contacts.
The contactor coil operates by closing the contacts when
energized by 24vac.
Liquid Solution Temperature Control: The liquid solution
temperature control is an adjustable, microprocessor-based
temperature control. This control receives temperature
information from a thermostat located on the liquid solution
supply line. A liquid crystal display continually indicates the
liquid solution temperature. The control is mounted inside the
chiller cabinet.
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