Carrier HVAC Unit 50FCQC05

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

Identify the location of the 2-Pin DIP switch near the center of the UCB

Set DIP Switch for 3 to 5 Ton Units

Set both DIP switches to 'OFF' (0) for 3 to 5 ton 50FCQ units

Set both DIP switches to 'ON' (1) for 6 ton 50FCQ units

Verify the DIP switch positions against the unit's control label diagram

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

Check for oil exposure to atmosphere

Check for use of certified refrigerants

Inspect for potential fire or explosion hazards

Notify proper authorities about maintenance

Disable the relevant circuit to avoid false alarms

Disconnect power from the duct detector

Remove loose dirt and debris from inside the sensor housing and cover

Clean the gasket on the sensor’s cover

Squeeze the retainer clips on both sides of the optic housing

Lift the housing away from the printed circuit board