Data Aire LCS Installation, Operation And Maintenance Manual

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Data Aire LCS Installation, Operation And Maintenance Manual Manual pdf 18 page image

18Noise factors should be also consideredwhen locating an air cooled heatexchanger. Proximity to windows, walls,and surrounding structures can causeobjections by the occupants. An acousticalexpert should be consulted when noise isof a particular concern.Air cooled heat exchangers should beplaced at a level that is higher than theindoor evaporator. Mounting the remoteheat exchanger (condenser or condensingunit) more than 10 feet below the evaporatoris not recommended. Excessive liquid linepressure drop can cause poor evaporatorperformance.Piping must be supported within 18 inchesof the inlet and outlet connections. Theinlet connection is located on the topheader on all remote heat exchangers and the outlet connection is located on the bottom header ofall units.Air cooled condensers should be placed at a level that is above the level of the indoor evaporator.Mounting a condenser or condensing unit more than ten feet below the evaporator is not recommended.Excessive liquid line pressure drop can cause poor evaporator performance.4.4 Electrical ServiceRefer to Sections 3.1 to 3.5 for information regarding line voltage and control voltage wiringdetails.4.5 Air Cooled Condensers - Model DARC4.5.1 Fan Speed ControlStandard outdoor air cooled condensers have a fan speed controller on the first fan. On single-fan condensers this is the only means of control. A variable speed controller modulates the motorspeed based on system head pressure. The fan speed controller will normally not require fieldadjustment.4.5.2 Ambient ThermostatsAdditional motors (subsequent to the fan speed control operated motor) on multi-fan condensersare cycled by ambient-sensing thermostats. These thermostats have a capillary tube with a remotesensing bulb. They will function best if the sensing bulbs are mounted below the coil, away fromexposure to direct sunlight, with the bulb in a vertical position. An instruction set comes as part of amounting kit that includes a sheet metal bracket, mounting clamp(s) and TEK screws. This includesdirections for field mounting and adjusting the thermostat bulbs. Desired head pressure should bemaintained at approximately 250 psi.