Lennox CBA25UH: Maintenance

PRE-START-UP CHECKS

• Is the air handler properly and securely installed?

• If horizontally configured, is the unit sloped up to 1/4 inch toward drain lines?

• Will the unit be accessible for servicing?

• Has an auxiliary pan been provided under the unit with separate drain for units installed above a finished ceiling or in any installation where condensate overflow could cause damage?

• Have ALL unused drain pan ports been properly plugged?

• Has the condensate line been properly sized, run, trapped, pitched, and tested?

• Is the duct system correctly sized, run, sealed, and insulated?

• Have all cabinet openings and wiring been sealed?

• Is the indoor coil factory-installed TXV properly sized for the outdoor unit being used?

• Have all unused parts and packaging been disposed of?

• Is the filter clean, in place, and of adequate size?

• Is the wiring neat, correct, and in accordance with the wiring diagram?

• Is the unit properly grounded and protected (fused)?

• Is the thermostat correctly wired and in a good location?

• Are all access panels in place and secure?

CHECK BLOWER OPERATION

• Set thermostat to FAN ON.

• The indoor blower should come on.

CHECK COOLING OPERATION

• Set thermostat to force a call for cooling (approximately 5ºF lower than the indoor ambient temperature).

• The outdoor unit should come on immediately and the indoor blower should start between 30 - 60 seconds later.

• Check the air flow from a register to confirm that the system is moving cooled air.

• Set the thermostat 5ºF higher than the indoor temperature. The indoor blower and outdoor unit should cycle off.

CHECK ELECTRIC HEAT (IF USED)

• Set thermostat to call for auxiliary heat (approximately 5°F above ambient temperature). The indoor blower and auxiliary heat should come on together. Allow a minimum of 3 minutes for all sequencers to cycle on.

• Set the thermostat so that it does not call for heat. Allow up to 5 minutes for all sequencers to cycle off.