Carrier 48EZ(N)-A Installation Instructions Manual

Also see for 48EZ(N) - A: Installation instructions

Contents

34BLOWERHOUSING2 SETSCREWS(HIDDEN)C99085Fig. 19 -- Removal of Motor and Blower WheelA07680Fig. 20 -- Burner Rack RemovedFEEDER TUBESTUB TUBEDEFROSTTHERMOSTATC99029Fig. 21 -- Defrost Thermostat LocationA07680Fig. 22 -- Burner Rack RemovedOutdoor FanUNIT OPERATION HAZARDFailure to follow this caution may result in damage to unitcomponents.Keep the outdoor fan free from all obstructions to ensureproper cooling operation. Never place articles on top of theunit.CAUTION!1. Remove 6 screws holding outdoor grille and motor to topcover.2. Turn motor/grille assembly upside down on top cover toexpose the fan blade.3. Inspect the fan blades for cracks or bends.4. If fan needs to be removed, loosen the setscrew and slide thefan off the motor shaft.5. When replacing fan blade, position blade back to the sameposition as before.6. Ensure that setscrew engages the flat area on the motor shaftwhen tightening.7. Replace grille.Electrical Controls and WiringInspect and check the electrical controls and wiring annually. Besure to turn off the gas supply, and then the electrical power to theunit.Remove access panels (see Fig. 18) to locate all the electricalcontrols and wiring. Check all electrical connections for tightness.Tighten all screw connections. If any discolored or burnedconnections are noticed, disassemble the connection, clean all theparts, re--strip the wire end and reassemble the connection properlyand securely.After inspecting the electrical controls and wiring, replace theaccess panels (see Fig. 18). Start the unit, and observe at least onecomplete heating cycle and one complete cooling cycle to ensureproper operation. If discrepancies are observed in any operatingcycle, or if a suspected malfunction has occurred, check eachelectrical component with the proper electrical instrumentation.Refer to the unit wiring label when making these checkouts.NOTE: Refer to the heating and/or cooling sequence of operationin this publication as an aid in determining proper controloperation.Refrigerant CircuitAnnually inspect all refrigerant tubing connections and the unitbase for oil accumulations. Detecting oil generally indicates arefrigerant leak.48EZ -- A