How to do preventive maintenance on your air handler.
First start with safety by turning off the power to the air handler.
Then thoroughly inspect the unit for any missing screws and loose covers.
That need to be fixed.
The unit I am working is a package unit.
You can apply this info to a split system also.
Start by removing the blower motor cover.
Blower motor and squirrel cage.
As shown in photo.
If your unit has a belt thoroughly inspect it
for cracks or dry rotting.
If it looks bad replace it.
Also make sure the belt tension is good.
If it is loose adjust it.
Be sure not to over tighten it.
Then check the motors amp draw with a amp meter.
Make sure the amps are with in the range of the
You will find the tag on the motor.
The label will tell you the amp reading.
Look and see if you have any zerk fittings on the blower motor
and squirrel cage.
Any zerk fittings go ahead and grease the fittings
with one to two pumps of grease with a grease gun.
For most purposes used multi purpose grease.
Check your specifications to see whats best on your system.
Check all the wires on the blower motor make sure you
do not have any frayed wiring or loose wiring on any connectors.
Wires can get damage from vibration and age over time.
Next go ahead and check the electrical compartment.
As shown in photo.
Thoroughly examine all of the wires for any frayed
or broken wires and any wires that look baked.
Any wiring that gets screwed in.
Make sure all connections are tight.
Also any connections that have wire nuts
make sure they are tight.
Then check your contactor make sure all
the connections on it are tight.
Also check the contactor contacts.
Look at it and make sure the contacts
don’t look singed or burnt.
If it looks bad replace the contractor.
All the information is on the contactor
that you will need to replace it.
As shown in photo
After you completely thoroughly inspected
the electrical compartment you will go ahead
and inspect the compressors and the wiring.
Check the wiring for any frayed, burnt or loose contacts.
Also check make sure no wires are rubbing on metal.
Check the compressor copper lines to see that
the copper lines are not rubbing on any other metal
or anywhere that it can cause wear from rubbing.
The copper lines can be moved a little bit without damaging them.
Compressor as shown in photo.
Next we will check the condenser motor and fan blades.
Once again check all the wiring for any bad
connections or baked wires.
Also inspect the fan blades to make sure none of the blades
are bent or loose.