Carrier 40MBC/38MAQ Installation Instructions Manual

Contents

15OUTDOOR UNIT INSTALLATION1. Use a rigid base to support the unit in a level position.2. Locate the outdoor unit and connect the piping and wiring.CAUTION!EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipment damageor improper operation.In regions with snowfall and cold temperatures, avoid installingthe outdoor unit in areas where it can be covered by snow. If theoutdoor unit is installed in areas where heavy snow is expected, afield supplied ice or snow stand and/or field supplied--installedwind baffle should be installed to protect the unit from snowaccumulation and/or blocked air intake. Blocking the air intakemay result in reduced airflow, significantly reduced performanceand damage to the equipment.StrongwindA07350Fig. 33 --- High Wind InstallationMAKE REFRIGERANT PIPING CONNECTIONS(OUTDOOR UNIT)IMPORTANT: Use refrigeration grade tubing ONLY. No othertype of tubing may be used. Use of other types of tubing willvoid the manufacturer’s warranty.Do not open service valves or remove protective caps from tubingends until all the connections are made. Bend the tubing with bendingtools to avoid kinks and flat spots. Keep the tubing free of dirt, sand,moisture, and other contaminants to avoid damaging the refrigerantsystem.Avoid sags in the suction line to prevent the formation of oil traps.Insulate each tube with minimum 3/8--in. (10 mm) wall thermal pipeinsulation. Inserting the tubing into the insulation before making theconnections will save time and improve installation quality.1. Remove the service valve cover if provided with the unit.2. Cut the tubing with a tubing cutter. Remove the serviceconnection if provided with unit.3. Install the correct size flare nut onto the tubing and makethe flare connection.4. Apply a small amount of refrigerant oil to the flareconnection on the tubing.5. Properly align the tubing with the service valve.6. Tighten the flare nut to proper torque value (see Table 5) andfinish the installation using backup wrenches (see Fig. 34).A07354Fig. 34 --- Tighten Flare NutTable 5— Tightening TorquePipe DiameterInch (mm)Tightening TorqueFt--lb N--mØ1/4” (6.35) 10 to 13 13.6 to 17.6Ø3/8” (9.52) 23 to 31 32.5 to 42.0Ø1/2” (12.7) 37 to 46 50.1 to 62.3Ø5/8” (15.88) 60 to 60 67.7 to 81.3CAUTION!EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.Excessive torque can break flare nut depending oninstallation conditions.INSTALL ALL POWER AND INTERCONNECTINGWIRING TO OUTDOOR UNITS1. Mount the outdoor power disconnect.2. Run the power wiring from the main box to disconnect perNEC and local codes.3. Remove the field wiring cover from the unit by looseningthe screws.4. Remove the caps on the conduit panel.5. Connect the conduit to the conduit panel (see Fig.35).6. Properly connect both the power supply and the controllines to the terminal block per the connection diagram forthe appropriate unit capacity and voltage.7. Ground the unit in accordance with NEC and localelectrical codes.8. Use lock nuts to secure the conduit.9. Reinstall the field wiring cover.CAUTION!EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.S Comply with local codes while running wire from indoorunit to outdoor unit.S Every wire must be connected firmly. Loose wiring maycause the terminal to overheat or result in unitmalfunction. A fire hazard may also exist. Be sure allwiring is tightly connected.S No wire should be allowed to touch the refrigeranttubing, compressor or any moving parts.S Disconnecting means must be provided and shall belocated within sight and readily accessible from the airconditioner.S Connecting cable with conduit shall be routed throughhole in the conduit panel.GOver 1.57" (40mm)Terminal BlockConduit panelConduitOutdoor unitA07455Fig. 35 --- Field Wiring