Air handler squeals

If you mean that your OUTDOOR AIR CONDITIONER FAN MOTOR is blowing AND no air is coming out of the vents within your house, it clearly indicates to me that 1 of 2 things are wrong.

Either (1) your INDOOR AIR HANDLER is NOT running or (2) the INDOOR AIR HANDLER is running but your PLENUM has come apart.

If your INDOOR AIR HANDLER UNIT is NOT running, it could simply be the circuit breaker is OFF/TRIPPED and simply needs to be turned OFF; then turned ON. If that does not FIX your problem, then it is most likely your 5 micro-farad run capacitor for your indoor fan motor needs to be replaced. It will prevent your indoor fan motor from energizing. Worst case scenario would be your INDOOR FAN MOTOR has windings burnt and needs to be replaced. If your indoor air handling unit is equipped with a CONDENSATE VALVE CUT-OFF SWITCH, check to see if your drain pan is filled, thus energizing the switch. If the CONDENSATE VALVE CUT-OFF SWITCH is ENERGIZED, it will prevent the AIR HANDLER FROM energizing. That is the design and the reason for this valve.

Good luck.

green goes to g on air-handler,white goes to w on air-handler yellow goes to outside condensor, red from air-handler goes to rh-rc on thermostat, whire off c on air-handler goes to outside condensor.

If this unit is belt driven, the belt may be worn or slightly loose.

What's wrong with your current AHU? Any Ruud dealer can assist you. Most 4 ton units work with r-22 or 410a. As a side note, most parts in an air handler can be replaced unless the case is rusted thru.

You have a bad sequencer on the air handler.

Time for a new drive belt. Clean the air filter while you are at it.

Air should be blowing out the top, if not, need to check wiring to fan

alot of times that noise is coming from the orifice in the air handler it is the gas flowing through the screen could have pick up something in the lines

yes and that's dangerous as fumes and exhaust may enter the house

follow the copper lines coming into the air handler.1 will be large and insulated and the other smaller and uninsulated.They attach to your evap coil.