Carrier Comfort 48ES-A Installation Instructions Manual

Also see for 48ES---A: Owner's information manual Owner's information manual Owner's information manual Installation instructions

51MOTOR FAN GRILLEMOTOR SHAFTAA08505MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADESIZE “A”IN. MM24 7.3 18530 7.3 18536 7.3 18542 7.6 19348 7.6 19360 7.6 193Fig. 22 -- Fan Blade PositionElectrical Controls and WiringInspect and check the electrical controls and wiring annually. Besure to turn off the electrical power to the unit.Remove access panels (see Fig. 19) to locate all the electricalcontrols and wiring. Check all electrical connections for tightness.Tighten all screw connections. If any smoky or burned connectionsare noticed, disassemble the connection, clean all the parts, re--stripthe wire end and reassemble the connection properly and securely.After inspecting the electrical controls and wiring, replace all thepanels. Start the unit, and observe at least one complete coolingcycle to ensure proper operation. If discrepancies are observed inoperating cycle, or if a suspected malfunction has occurred, checkeach electrical component with the proper electricalinstrumentation. Refer to the unit wiring label when making thesechecks.Refrigerant CircuitAnnually inspect all refrigerant tubing connections and the unitbase for oil accumulations. Detecting oil generally indicates arefrigerant leak.EXPLOSION, SAFETY AND ENVIRONMENTALHAZARDFailure to follow this warning could result in personalinjury, death or property damage.System under pressure. Relieve pressure and recover allrefrigerant before system repair or final unit disposal. Useall service ports and open all flow--control devices,including solenoid valves.! WARNINGIf oil is detected or if low cooling performance is suspected,leak--test all refrigerant tubing using an electronic leak--detector,halide torch, or liquid--soap solution. If a refrigerant leak isdetected, refer to the Check for Refrigerant Leaks section.If no refrigerant leaks are found and low cooling performance issuspected, refer to the Checking and Adjusting Refrigerant Chargesection.Gas InputThe gas input does not require checking unless improper heatingperformance is suspected. If a problem exists, refer to the Start--Upsection.Evaporator AirflowThe heating and/or cooling airflow does not require checkingunless improper performance is suspected. If a problem exists, besure that all supply-- and return--air grilles are open and free fromobstructions, and that the air filter is clean. When necessary, refer tothe Indoor Airflow and Airflow Adjustments section to check thesystem airflow.Puron ItemsMetering Device (Thermostatic Expansion Valve )This metering device is a hard shutoff, balance port TXV. TheTXV maintains a constant superheat at the evaporator exit resultingin higher overall system efficiency.Pressure SwitchesPressure switches are protective devices wired into control circuit(low voltage). They shut off compressor if abnormally high or lowpressures are present in the refrigeration circuit. These pressureswitches are specifically designed to operate with Puron (R--410A)systems. R--22 pressure switches must not be used as replacementsfor the Puron (R--410A) system.Loss of Charge SwitchThis switch is located on the liquid line and protects against lowsuction pressures caused by such events as loss of charge, lowairflow across indoor coil, dirty filters, etc. It opens on a pressuredrop at about 20 psig. If system pressure is above this, switchshould be closed. To check switch:1. Turn off all power to unit.2. Disconnect leads on switch.3. Apply ohm meter leads across switch. You should havecontinuity on a good switch.48ES-- A