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manual abstract
Compact size allows faster rigging, installation and setup on the ground or on the roof. Units arrive assembled and fully charged with R-22. A simple hookup to power supply and chilled water lines completes the installation. The 30GB line saves operating costs with precise multiple step capacity control. Either 6, 7 or 8 steps of control, depending on the unit, allows load handling to 12-1/2% of total capacity Condenser coils are circuited for maximum subcooling, increasing unit capacity 1% for each 2 degrees of subcooling with no increase in power input or need for larger, costlier compressors. Multiple condenser fans cycle automatically to maintain positive head pressure for low ambient operation down to 0°F without additional controls to purchase! The 30GB chillers perform reliably on the job, too. Compressors are mounted on spring-isolated rails to minimize vibration, eliminating the need for external isolation. All controls and factory wiring are protected within weather-resistant, galvanized steel enclosures. Fan guards are PVC-coated steel wire for weather resistance. Put Carrier’s high capacity liquid chillers to work on your large commercial job. The cost-saving advantages of fast installation, controlled capacity operation, and low maintenance really add up to superior performance. Carrier’s serviceable semi-hermetic compressor is protected by unique live-way system 1. Ground current sensing refrigerant circuit protection. An electronic sensing device automatically shuts down a compressor if an electrical phase imbalance greater than 2.5 amps occurs due to compressor motor malfunction, thus preventing refrigerant system contamination. .2« Overtemperature protection. Discharge gas thermostat, located in the cylinder head of each compressor, triggers a refrigerant circuit shutdown if temperature becomes abnormally high, preventing compressor faSure. 3. Electrical overload protection. Calibrated, ambient-compensated, magnetic-trip circuit breakers •wife manual reset provide single-phase and phase reversal protection. 4. OU-pressure safety switch. A switch in each refrigerant circuit protects compressors from damage due to Jack oi proper lubrication. 5. High-pressure switch. A switch mounted on each compressor shuts off the compressor if discharge pressure becomes excessive. 0 © © 1 Additional compressor features: © Vane-type positive cfepiacemer.t o2 pump : Motor-compressor crankshaft Discharge shutoff vaive Terminal box OS reservoir showing oil screen and oii intake fine e © © 0 Discharge vaive assembiy Crankcase Oil heater Isolation springs High-pressure switch Discharge gas thermostat The Carrier 30GB chillers offer more features for more cost-saving flexibility Cooler freeze-up protection Each unit is protected against cooler freeze-up by 2 methods. A low-water temperature safety thermostat stops the unit automatically if water temperature drops below 36 F. By the second method, factory-installed heaters protect the cooler from the effects of subfreezing ambient temperatures. These heaters are located around the shell, between the shell and a thick layer of closed-cell insulation; they are energized whenever the chilled water flow stops. Compressor crankcase heaters Each compressor has an electric heater that operates only during periods of compressor shutdown to assure proper lubrication by minimizing refrigerant dilution of oil. Easy access to components All electrical components are accessible thru removable service panels. Cooler and compressor are protected by removable steel wire guards. Carrier also provides a handy convenience outlet (115 v) for connecting lights and power tools. Standby protection Multiple compressor operation offers system reliability in case of a malfunction or safety cutout. Dual, independent refrigerant circuits maintain partial unit capacity even if one circuit fails. This backup protection can help prevent costly damage in process cooling or industrial applications. Flow switch Chilled water flow switch shuts down the unit and energizes the cooler heaters in case chilled water flow stops. Units meet NEMA-MGI motor standards All compressor and fan motors meet National Electrical Manufacturer’s Association and U.S. government standards. O e o o e © o o o High-pressure light Low-pressure light Discharge temperature light Oil-pressure light Valve, discharge pressure gage Discharge pressure gage Suction pressure gage Valve, suction pressure gage Control power light 3 ^ Control power ON-OFF switch Control circuit fuse Reset button (control circuit) № Reset button (low water temperature cutout) ^ Convenience outlet (115 volts) ^ Temperature controller ^ Lead/lag transfer switch Demand limit light ill lit WM ¿w-■ ■ : :: :. .t! -....... 5’-6| (I6SS tnm) »■G61NG HOLES RIGGING HOLES t6'-S” (5004 mm) 24,-Ti % (7496 mm) SiDE VIEW Unit must have clearances as foiiows: Top —Do not restrict >r* any way Ends ...