Carrier HVAC Unit 50FCQM07

Ensure no exposure of POE oil to the atmosphere

Verify no use of air or gases containing oxygen for leak testing

Confirm use of certified refrigerants only

Turn off unit power, tag disconnect

Remove all screws from the top panel except the screws securing the condenser fan to the top panel

Lift and rotate the top panel at the condenser fan end and rotate the panel 90 degrees

Support the top panel so it remains level while resting on the condenser fan

Remove the compressor access panel to access the lower coil clip

Remove the condenser coil corner post if necessary

Remove the screws from both sides of the upper and lower coil retaining clips on the hairpin end of the coil tube sheets

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 (approximately 60 seconds)

Reset the sensor by removing the test magnet and holding it against the sensor housing again until the Alarm LED turns off (approximately 2 seconds)

Clean outdoor hood inlet filters

Check condenser coil cleanliness

Air Conditioning Seasonal Maintenance

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

Attach TXV bulb in the same location where the original was removed