Carrier 38MAQB09 Series Product Data

Contents

Carrier 38MAQB09 Series Product Data Manual pdf 9 page image

9APPLICATION DATAUNIT SELECTIONSelect equipment to either match or is slightly less than theanticipated peak load. This provides better humidity control, fewerunit cycles, and less part--load operation.For units used in spaces with high sensible loads, base equipmentselection on unit sensible load, not on total anticipated load. Adjustfor anticipated room wet bulb temperature to avoid undersizingequipment.UNIT MOUNTING (INDOOR)Refer to unit Installation Instructions for further details.Unit leveling -- For reliable operation, units should be level in allplanes.Clearance -- Provide adequate clearance for airflow as shown inFig. 4.Unit location -- Select a location which will provide the best aircirculation for the room.These units should be positioned on the floor, against the wall forbest air circulation. The unit return and discharge should not beobstructed by furniture, curtains, or anything which may cause unitshort cycling or air recirculation. Place the unit in the middle of theselected wall (if possible). Use an outside wall, if available, tomake piping easier, and place the unit so it faces the normallocation of room occupants.UNIT MOUNTING (OUTDOOR)Refer to unit Installation Instructions for further details.Unit leveling -- For reliable operation, units should be level in allplanes.Clearance -- Minimum clearance, (see Fig. 5), must be providedfor airflow. The condensing units are designed for free--blowapplication. Air inlets and outlets should not be restricted.Unit location -- A location which is convenient to installation andnot exposed to strong wind.A location which can bear the weight of outdoor unit and wherethe outdoor unit can be mounted in a level position.Do not install the indoor or outdoor units in a location with specialenvironmental conditions. For those applications, contact yourductless representative.MOUNTING TEMPLATERefer to unit Installation Instructions for further details.The fan coil units are furnished with mounting to mark the locationof the wiring, and refrigeration line hole locations.SUPPORTAdequate support must be provided to support the weight of all fancoils. Refer to the Physical Data section for fan coil weights, and thebase unit dimensional drawings for the location of mounting brackets.SYSTEM OPERATING CONDITIONSOPERATING RANGEMin / Max ° F (° C)Cooling HeatingOutdoor DB --- 4 / 122 ( ---20 / 50) --- 4 / 86 ( ---20 / 30)Indoor DB 63 / 90 (17 / 32) 32 / 86 (0 / 30)Indoor WB 59 / 84 (15 / 29)NON--- OPERATING TEMPERATURE RANGEMin / Max ° F (° C)Indoor/Outdoor DB 32 / 86 (0 / 30)NOTE: Reference the Product Installation Instructions for moreinformation.METERING DEVICESThe outdoor unit has an electronic expansion valve to manage therefrigerant flow of the fan coil connected.DRAIN CONNECTIONSInstall drains to meet local sanitation codes. If adequate gravitydrainage cannot be provided, the unit should be equipped with anaccessory condensate pump. The floor console fan coil unitcondensate pumps have a maximum lift of 10’ (3.05 m) for 9k and12k units and 25’ (7.62 m) for 18k and 30k units.See the physical dimension tables for drain sizes.NOTE: Floor console fan coil units have internal condensatetraps. A trap is not required.REFRIGERANT LINESGeneral refrigerant line sizing:1. The outdoor units are shipped with a full charge of R410Arefrigerant. All charges, line sizing, and capacities are basedon runs of 25 ft. (7.6 m). For runs over 25 ft. (7.6 m),consult long--line section on this page for the propercharge adjustments.2. Refrigerant lines should not be buried in the ground. If it isnecessary to bury the lines, not more than 36--in (914 mm)should be buried. Provide a minimum 6--in (152 mm)vertical rise to the service valves to prevent refrigerantmigration.3. Both lines must be insulated. Use a minimum of 1/2--in.(12.7 mm) thick insulation. Closed--cell insulation isrecommended in all long--line applications.4. Special consideration should be given to isolating theinterconnecting tubing from the building structure. Isolatethe tubing so that vibration or noise is not transmitted intothe structure.Long Line Applications1. No change in line sizing is required.2. Add refrigerant per table below.ADDITIONAL CHARGE TABLEUNIT SIZETOTAL LINELENGTH ftADDITIONAL CHARGE,oz/ft. ft (m)Min Max 10 --- 25(3 --- 8)>25 --- 82(8 --- 25)9 10 82 None 0.1612