Fan Coil Unit 488L-Ser#F2RP042N06B,Motor 3.8FLA, 3/4 HP,60HZ with heater Acessory. Unit fan speed reduced to very low speed, heating elements are heating however fan is not running fast enough to circulate heat. The situation happened suddenly. Heating function responding to thermostat demand and fan responds at very low speed.
Will try your suggested solution. Wish I could afford more $ for your help...sasafras2Will try your suggested solution. Wish I could afford more $ for your help...sasafras2
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Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.
Check the fan. Unplug the unit and remove the panel that houses the fan unit. Electrical cleaner can be sprayed onto the connection points of the nicad heater elements as well as the fan motor. It may be that one of the heating coils has a bad connection. Take apart and reassemble heating elements and connection points.
With the tstat system off and fan in auto the fan still runs? ecm motors have a constant 240 and run by the low voltage. with the stat set properly verify voltage to the motor. if no low voltage only high then the module is likely bad. psc motors run when the speed tap is energized. maybe trace problem back to a bad relay. The 77/75/73 thing doesn't make sense unless it is then running in 2nd stage. Static pressure will increase fan speed and cause lots of issues with the fan pulling water off the coil and missing the pan. I have a piece if plexiglass I use so I can remove the blower door and cover with the glass to see what's happening. The coil is supposed to condensate, possibly slow the fan down in second stage. Check your static, check the subcooling, and also be sure you have the baffle/ shark fin in the coil set the right way for your application (horizontal right/ horizontal left) best wishes!!
What I would suggest if you plan on replacing this motor your self, would to take motor out and take it down to an appliance parts house and pick up a 1/4 hp. motor that will work. If the amperage is close and the shaft diameter is the same, you will save some money with an after market or universal motor. Use a long Allen wrench to loosen the blower wheels and bolts if it has them on the shaft, mark the wiring so you know where the new wire goes, and install in reverse of removing. TURN off POWER! Good Luck, Sincerely, shastalaker7 ps Allen wrench are for the set screws on both shafts.This motor can be tricky to remove.
It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that'sprobably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,
Remember a fan switch has 2- contacts pus coil power (24volts) a normaly open --and a normaly close thus n. o. contacts and a n. c. .. contacts and and you hook the 24volt coil contact to cool and the hi-speed fan switch to the n.o. contacts... SO when it don't calls for cool the n.c. contact wil send power to the low speed wire for heat (red to the fan motor which connects to the temperature control which cycle on the fan when calling for heat! HEY, you didn't give enough information, like WHAT___WHERE___WHEN__WHO ??? ____ model #-- name of unit-- age-- gas fire or electric ---upflw or downflow?
Will try your suggested solution. Wish I could afford more $ for your help...sasafras2
Thank you!!
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