Carrier HVAC Unit 50FCQA05

Clean outdoor hood inlet filters

Check condenser coil cleanliness

Seasonal Air Conditioning Maintenance

Remove screws from retaining rings in the top of the fan rotor

Remove screws connecting motor to stator flange

Remove stator limit switch on aluminum stator if required

Remove screws from the heat shield

Retain the heat shield if a new heat shield has not been ordered

Remove TXV support clamp using a 5/16 in. nut driver

Remove TXV using a wrench and an additional wrench on connections to prevent damage to tubing

Remove equalizer tube from suction line of coil

Cut brazed equalizer line approximately 2 inches above suction tube

Remove bulb from vapor tube inside cabinet

Install the new TXV using a wrench and an additional wrench on connections to prevent damage to tubing while attaching TXV to distributor

Attach the equalizer tube to the suction line

If the coil has a mechanical connection, use a wrench and an additional wrench on connections to prevent damage

Disconnect all auxiliary equipment from the controller

Notify the proper authorities if the duct detector is connected to a fire alarm system

Controller Alarm Test Procedure

Press the controller’s test/reset switch for 7 seconds

Verify that the controller’s Alarm LED turns on

Reset the sensor by pressing the test/reset switch for 2 seconds

Verify that the controller’s Alarm LED turns off

Turn unit power off and install lockout tag

Remove evaporator coil access panel

If economizer or two-position damper is installed, remove economizer by disconnecting Molex®1 plug and removing mounting screws

Clean coil using a commercial coil cleaner or dishwasher detergent in a pressurized spray canister

Wash both sides of coil and flush with clean water

Flush condensate pan after completion

Reinstall economizer and filters