Accurex XMPX Series Installation, Operation And Maintenance Manual

Accurex XMPX Series Installation, Operation And Maintenance Manual Manual pdf 4 page image

Product OverviewThis model is a horizontally configured make-upair unit designed for outdoor installations. It hasan integral DX package for cooling and optionallycontains either an electric heater or one or two highlyefficient indirect gas-fired furnace(s) to provide aprimary heat source for the building or to simplytemper the air that is supplied to the building. The unitis designed to provide sufficient air to replace air thatis exhausted from the building and also heat and coolas needed. The make-up air volume produced by theunit is constant, but can be optionally modulated toprovide a variable volume (VAV).The DX system comes fully charged with R-410Arefrigerant from the factory and is ready for operationupon arrival.All units are equipped with two compressors asstandard. The smallest units may have only onecompressor. If the digital scroll compressor optionwas selected, the lead circuit will have a digitalscroll compressor and if a second compressor ispresent, that one will be a standard fixed scroll type.All units with multiple compressors allow for stagingof compressors to meet a wider range of outdoorair loads while reducing the number of cycles percompressor.Compressed RefrigerantAll of these make-up air models are charged withenvironmentally-friendly R-410A compressedrefrigerant. Do not use tools or parts designed forother refrigerants on this unit.Airflow ArrangementThis model is designed for 100% outdoor air andcan be combined with a Variable Air Volume (VAV)capability for greater flexibility in response to buildingair handling needs. The optional VAV function involvesa Variable Frequency Drive (VFD) controller for theblower motor.Safety ListingThe models are listed per ANSI/UL 1995, Heating andCooling Equipment and are ETL Certified.Supplemental Installation, Operation andMaintenance ManualsRefer to the following Installation, Operation andMaintenance manuals for additional information:• Plenum and Plug• Indirect Gas-Fired Furnace, Model PVF• PCO3 ControllerMPX SubassembliesBlowerEach unit has just one backward curved blower(centrifugal fan). For further information refer to thePlenum and Plug IOM.CoilsEvery unit is supplied with a single DX evaporator coil.If there is only one cooling circuit, then the DX coilis not divided. If two cooling circuits are specified,then the DX coil will be an interlaced design. A reheatcoil may be optionally installed in the unit and isconnected to the lead compressor. Multiple condensercoils are attached to the exterior of the model.DampersThere is only one damper that may be found in theunit. It is an optional low-leakage motorized damperlocated inside the cabinet in the intake airstream, nearthe air intake weatherhood.DX SystemThe DX system in the model is a complete, sealedunit with compressed R-410A refrigerant. It consistsof one or two compressors (digital scroll optional),evaporator and condenser coils and the followingintegral components:• expansion valves• liquid line filter driers• service / charging valves• moisture indicating sight glass• hot gas bypass (not present on optional digitalscroll compressors)• crankcase heater on each compressorEach DX system incorporates the following:• high pressure manual reset cutout• low pressure auto-reset cutout• time delays for compressor protectionElectric HeaterAn electric heater is optionally available for the modeland is used for tempering of the make-up air.FiltersEach unit is optionally equipped with washable metalfilters in the outdoor air intake and with pleatedpapers filters in the air intake stream. Paper filters maybe MERV 8 only, or the MERV 8 filters may be installedas pre-filters for the optional MERV 13 paper filters oroptional MERV 15 filters.Indirect Gas-Fired FurnaceThe model may optionally include as many as twoindirect gas-fired furnaces. See also Indirect Gas-Fired Furnace, Model PVF Installation, Operation andMaintenance Manual.4 Model MPX Make-Up Air UnitModel XMPX Make-Up Air Unit