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CS/CD/CT Models (7.5 to 37 Tons)
(R 3/96) 3
The control system shall automatically energize the stand-by chiller module whenever any of the alert
conditions exist and energize the “Stand-by—On Other Failed” message on the monitor panel.
The solid-state plug-in alarm module shall include a Push-to-Test circuit for testing all operating and
alarm mode messages as well as the audible alarm. An individual Push-to-Test button shall be provided
to test each alarm condition. This will verify the function of the audible alarm, the lights and the
switchover to the stand-by module. A reset button shall reset a module after the malfunction has been
corrected.
The control system shall also include a set of non-powered, normally open contacts for a remote
customer alarm and two custom alarm inputs and visual messages to be customer specified.
2.1.5 Semi-Hermetic Compressors
The compressor shall be semi-hermetic with a suction-gas cooled motor, vibration isolators, thermal
overloads, oil sight glass, manual reset high pressure switch, pump-down low pressure switch, suction
line strainer, reversible oil pumps for forced feed lubrication and a maximum operating speed of 1750
RPM. The minimum EER for the compressor shall be ______ at ARI rated conditions (130°F SCT, 45°F
SST, 15°F subcooling). Compressors may be suitable for capacity modulation in addition to hot gas
bypass systems.
2.1.6 Refrigeration System
Each refrigeration system shall be direct expansion with separate, fully insulated shell and tube
evaporator. The refrigeration circuit shall include a hot gas muffler, liquid line filter drier, refrigerant
sight glass and moisture indicator, and adjustable externally equalized thermostatic expansion valve,
liquid line solenoid valve, hot gas bypass solenoid and valve to control compressor capacity at reduced
load. All components of the system shall be factory connected with type “L” refrigeration copper tubing.
2.2 STANDARD FEATURES/ INDIVIDUAL SYSTEMS
2.2.1 Air Cooled
Condenser
Each chiller module shall be provided with a Liebert manufactured, air cooled condenser. The
low-profile, propeller fan condenser shall be designed for vertical air flow and include an integral
electrical panel. The condenser shall balance the heat rejection requirements of each module at ______
°F. The copper-tube, aluminum-fin coil shall be housed in a corrosion-resistant aluminum cabinet.
LEE-TEMP Winter Control System
The LEE-TEMP winter control system shall allow start-up and provide positive head-pressure control at
ambients as low as -30°F. The LEE-TEMP package includes factory insulated receivers, refrigerant sight
glasses, pressure relief valves, 3-way head-pressure control valves and roto-lock valve for isolating the
refrigerant charge. All necessary electrical components shall be factory installed, connected, and
calibrated. Any components required to be installed by the installing contractor shall be done at no
additional cost to the owner.