SECTION 2 - PRODUCT DESCRIPTION Page: 23 General System Description Describes the Latitude (YCIV) chiller line's integration of screw compressor design and VSD technology for efficiency.
Compressor Details the direct-drive semi-hermetic rotary twin-screw MTS compressor, its lubrication, and bearing design.
Evaporator Explains the high-efficiency shell and tube type Direct Expansion Evaporator, its design pressures, and construction.
Condenser Describes the fin and tube condenser coils, fan motors, and blade construction for efficiency and low sound.
Capacity Control Explains how capacity is controlled by varying compressor speed via VSD, eliminating the need for Hot Gas Bypass.
Power and Control Panel Details the factory-wired and tested controls, VSD, and panel enclosures designed to NEMA 3R rating.
SECTION 7 - OPERATION Page: 209 OPERATING CONTROLS Covers the primary operating controls including anti-recycle timers, evaporator pump/heater control, and alarms.
BASIC OPERATING SEQUENCE Outlines the steps and conditions required to initiate the chiller's start sequence and loading.
Fuzzy Logic Control Describes how fuzzy logic makes decisions for speed adjustments based on error, rate of change, and timers.
LOAD LIMITING CONTROL Explains load limiting controls intended to prevent safety trips by monitoring motor current, pressure, and temperature.
CONDENSER FAN CONTROL Explains how condenser fan control is based on discharge pressure and utilizes multiple stages for optimization.
SOUND LIMIT CONTROL Explains how sound limit control reduces chiller noise levels by setting a Sound Limit Setpoint.
SECTION 8 - MICROPANEL Page: 231 VSD SAFETIES (FAULTS) Covers VSD safeties monitored by software and hardware circuitry to protect against various fault conditions.
IGBT Gate Driver (Hardware) Fault Describes the hardware fault triggered by IGBT saturation voltage exceeding the limit or power supply voltage falling below permissible levels.
Run Relay (Software) Fault Details the software fault that occurs if a missing run signal is not asserted within the specified window.
VSD CT Plug (Hardware) Fault Explains the hardware fault detected if CT plugs are not installed or if a low value is read on the digital input.
UNIT SAFETIES Lists unit safeties that cause compressor shutdowns when safety thresholds are exceeded, and their auto-reset behavior.
High Ambient Temp Fault Details the fault condition when ambient temperature rises above 130°F, causing controlled shutdown.
Low Ambient Temp Fault Explains the fault when ambient temperature falls below the programmable low ambient cutout.
VSD Communications Failure Fault Explains the fault preventing unit operation if the Chiller Control Board fails to initialize or maintain communication with the VSD Logic Board.
System Safeties (Faults) Lists system safeties that cause individual systems to shut down if a safety threshold is exceeded.
STATUS KEY Explains the function of the STATUS key for viewing chiller or system operational status and fault messages.
PROGRAM KEY Explains the PROGRAM key for accessing and modifying various programmable operating parameters.
Suction Pressure Cutout Details the suction pressure cutout's function in protecting the chiller from low refrigerant and freeze-up.
Low Ambient Cutout Explains the low ambient temperature cutout for shutting down the chiller based on outdoor temperature.
Motor Current Limit Details the programmable motor current limit (%FLA) to prevent faults on high current.
OPTIONS KEY Explains the OPTIONS key for viewing and modifying unit configuration settings.
MANUAL OVERRIDE KEY Describes the MANUAL OVERRIDE key's function for overriding schedule shutdowns and its limitations.
SERVICE KEY Describes the SERVICE key for viewing chiller system electronics data and controlling outputs for troubleshooting.
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