Carrier HVAC Unit 50FCQA04

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 using file or tubing cutter

Remove bulb from vapor tube inside cabinet

Use 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

Default Indications of Dirty Sensor Test

Verify default indications are active

Configuration of Dirty Sensor Test Operation

Ensure both sensors are configured to operate in the same manner when connected to a controller

Hold the test magnet on the sensor housing until the Alarm LED turns on and Dirty LED flashes twice

Reset the sensor by removing and reapplying the test magnet until the Alarm LED turns off

Notify proper authorities about maintenance

Disable the relevant circuit to avoid false alarms

Disconnect power from the duct detector

Clean the sensor housing and cover

Clean the gasket on the sensor’s cover

Clean around the optic plate and inside the optic housing

Replace the optic housing and sensor cover

Connect power to the duct detector

Clean outdoor hood inlet filters

Check condenser coil cleanliness

Seasonal Air Conditioning Maintenance

Disconnect all auxiliary equipment from the controller unless part of the test

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

Hold the test magnet where indicated on the side of the sensor housing for 7 seconds

Verify that the sensor’s Alarm LED turns on

Reset the sensor by holding the test magnet against the sensor housing for 2 seconds

Verify that the sensor’s Alarm LED turns off