Carrier 48HC 04-28 Manual
Also see for /50HC 04-28: Controls, Start-Up, Operation and Troubleshooting
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7CFM to the application requirements. The VFD’s settings shouldnot be used for adjusting fan performance. Specific VFDinformation can be found in Appendix C.IMPORTANT: The Supply Fan Maximum Speed (FS.MX) RPMmust not produce a supply CFM that is lower than the minimumCFM allowed in the product data for heating and cooling.For belt drive units with a power exhaust option, the controlsrequire an accurate supply duct CFM at the unit design point wherethe indoor fan will run at the Supply Fan Maximum Speed(FS.MX) for proper operation. The supply duct CFM is configuredby the Indoor Fan Max Speed CFM(Configuration→ECON→IDF.C). Default values for Indoor FanMax Speed CFM (IDF.C) are generally set per chassis and shouldbe changed per application. It is preferred to use the supply ductCFM from an air balance report to configure the Indoor Fan MaxSpeed CFM (IDF.C). If an air balance report is not available, thenuse the fan tables to determine Fan Max Speed CFM (IDF.C).When using the fan tables to determine Fan Max Speed CFM(IDF.C) set Economizer Position Test (ServiceTest→INDP→ECON) to 0 (Economizer Damper Closed) andIndoor Fan Speed Test (Service Test→FANS→F.SPD) equal toSupply Fan Maximum Speed (FS.MX). Measure the supply toreturn duct static pressure difference and indoor fan RPM. Makecorrection to static pressure for all options installed in the unit perthe accessory pressure drop table. Determine Indoor Fan MaxSpeed CFM (IDF.C) on the fan table where the corrected staticpressure and RPM cross.Condenser Fans and MotorsCondenser fans and motors are factory set.Return--Air FiltersCheck that correct filters are installed in filter tracks (see PhysicalData table in Installation Instructions). Do not operate unit withoutreturn-air filters.Outdoor--Air Inlet ScreensOutdoor-air inlet screens must be in place before operating unit.Accessory InstallationCheck to make sure that all accessories including space thermostatsand sensors have been installed and wired as required by theinstructions and unit wiring diagrams.Orifice Change (48HC)This unit is factory assembled for heating operation using naturalgas at an elevation from sea level to 2000 ft.Use accessory high altitude kit when installing this unit at anelevation of 2000 to 7000 ft. For elevations above 7000 ft, refer toHigh Altitude section to identify the correct orifice size for theelevation. Purchase these orifices from your local Carrier dealer.Follow instructions in accessory Installation Instructions to installthe correct orifices.Use accessory LP (liquid propane) gas conversion kit whenconverting this unit for use with LP fuel usage for elevations up to7000 ft. For elevations above 7000 ft, refer to High Altitudesection to identify the correct orifice size for the elevation.Purchase these orifices from your local Carrier dealer. Followinstructions in accessory Installation Instructions to install thecorrect orifices.INDOORBLOWERACCESSPANELCONTROL BOXACCESS PANELGAS SECTIONACCESS PANELINDOOR COILACCESS PANELFILTERACCESS PANELUNIT BACKUNIT FRONTC12218Fig. 4 -- 48/50HC SRT Units, Panel and Filter Locations (48HC*06 Unit Shown)ComfortLINK v1.X |
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