IPCX Chillers - Dunham-Bush Americas

INSTALLATION DATA○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○Chilled Water FlowTheIPCX Packaged Water Chilleris designed for a constant chilled water flow rate evenwhen the cooling load is varying. The machine willgenerally perform satisfactorily with steady flow ratesdeviating from design by as much as +10% to -50%.However, varying water flow rates can cause controlinstability which will result in undesirable system effects,particularly poor control of leaving chilled watertemperature. If two-way valves are used to control flowthrough cooling coils, some means such as an automaticmodulating valve should be provided in the system tomaintain steady flow through the cooler.Multiple Unit ControlOne of the most perplexing problems to systemdesigners is control of multiple chillers on the samewater loop. The first decision is whether to put thechillers in parallel or series on the chilled water side. Iflower pumping cost is paramount, then putting chillersin series is often preferable. If primary/secondarypumping is utilized with normal 10°F (6°C) range, thenputting chillers in parallel is normally used. In eithercase, themicrocomputer (withspecial programming) can control up to three chillers.This eliminates the need for external control interfacewhich often becomes difficult. Contact the factory ifmore than three chillers need to be networked.Condensing Water TreatmentCondensing water tends to leave silt, algae and mineraldeposits in the condenser tubes. This fouling graduallydecreases unit efficiency. For this reason, a program ofwater treatment should be employed. Also, at regularintervals depending an water quality, the unit shouldbe shut down, condenser heads removed and tubescleaned.FoundationA flat, level concrete foundation or floor capable ofsupporting the weight of the unit must be provided.The unit must be levelled to within 1/16 inch per foot(1.6mm per 30.5cm) for proper operation.Vibration IsolationWhere structure-borne vibration may be of concern, itis recommended that the unit be mounted on vibrationisolators. Spring isolators are available for this unit asoptional equipment. If spring isolators are installed, itis also necessary to provide isolation in condenser waterand chilled water pipes by means of flexible connectorsand in main power supply conduit through use offlexible conduit. Isolation of piping and electricalconduit is desirable in any event to avoid noisetransmission.Location and Installation SuggestionsIPCX Packaged Chillers are typically designed forindoor application. Proper locations and installationprocedures for this equipment are very important forsuccessful trouble free operation. It is desirable to installthese units with sufficient service space on all sides ofthe unit. Tube cleaning and unit servicing requireconsiderable space at the ends of the units as shown inthe dimensional outline section of this catalog.Compressor and motor servicing require space at therear of the unit. NEC and Local Codes require a minimumof 36 to 48 inches in front of the unit depending onthe application location.Equipment Location and Unit SecurityThe IPCX is a quiet operating chiller but soundsensitivity should be considered when locating thisequipment. Equipment and equipment rooms need tobe located in areas of the building that will not disturbsurrounding occupied spaces. Equipment rooms canbe acoustically designed for sound sensitive installationsto minimize sound transmission into occupied spaces.It is suggested that an acoustical Engineer be consultedon critical sound and vibration applications before,rather than after, the equipment is installed. Unitsecurity and personal safety should also be consideredwhen locating this equipment. All state and local soundand safety codes should be considered when laying outor installing mechanical equipment.Cooler - Freeze ProtectionThe leaving water sensor mounted on the Cooler willshut down the unit if a cooler freeze condition shouldoccur. A water flow switch must be supplied andmounted in the water piping to protect the unit fromlow or no flow, which can cause cooler freezing.Electrical Connection OptionsAll wiring must be done in accordance with the NationalElectric Code (NEC) and all local and state codes. Acomplete set of wiring diagrams for all units is availablefrom ourSales Representative. Theunit will be shipped with wiring diagrams located inthe electrical panel.20