![]() ![]() This is how the unit reverses the fan rotation. The white relay was double-pole double-throw (DPDT), which is used to reverse the polarity on one of the fan windings. To reverse-engineer the circuit, make a diagram of the component locations so that you can make connections as you buzz the circuit out with a voltmeter (Fig. ![]() There were also two black relays and one white relay. This would explain at least one of the bright yellow capacitors on the PCB. The large yellow film capacitors are for motor run, as well as motor speed control.Ĭeiling fans are capacitor-run single-phase induction motors. There are two black relays that control fan speed, and a white relay that changes the fan rotation. You can see where I cut the housing to get the wires out. The large connector captivates the PCB top housing. Otherwise you would need a pin extractor made for this particular connector to remove the housing and let the wires pass through the narrow slot.ĥ. You can see the only way to get the top off was to cut it so that the wires could be slipped by. The top housing is captivated by the connector that passes through it. Opening up the PCB housing displays more questionable mechanical engineering (Fig. ![]() It’s not isolated, and they use a piece of double-sided tape to space the heatsink from the metal fan housing. The underside of the PCB housing has a heatsink for the lamp SCR. While inaccessible screws are a bit lame, gluing your product together with tape is a bad idea and using the tape as an insulation system is even worse.Ĥ. That means the one strip of double-faced tape spaces the heat sink from the metal plate of the fan. One real concern is that the aluminum heat-sink plate for the SCR is not insulated to the SCR, so it has ac voltage on it. The only way to get the circuit board out is to use pliers to remove the two mounting screws.Ī third redundancy retaining the PCB is double-faced-tape (Fig. The mechanical engineering on the fan is a bit dismal. Engineers may have added the screws later, when the clips proved to be inadequate.ģ. The screws are redundant to plastic clips that protrude through the plate. The metal plate is captivated by the cast aluminum hanger it does not come off the shaft, at least not in any easy straightforward manner. To get the PCB removed, you have to use Vice-Grips to ease out the screws that are blocked by the motor (Fig. The disassembly procedure was abominable. ![]() This is in series with the light bulbs, which are controlled by an SCR on the PCB. The fan has a model 98480X 300-W current limiter made by Hunter. Hunter bought out Casablanca many years ago.Ģ. This model is a remote-control unit, hence the large and complex circuit board on the top of the motor. The Casablanca Claremont model 49G45H ceiling fan is rated 120 V, 60 Hz, 1.83 A, and 220 W. Since the light is controlled by an SCR on the remote-control printed circuit board (PCB), it’s important to make sure the SCR current rating is not exceeded.ġ. This device will cycle the lamps off until you screw in lower-wattage units. It prevents users from putting in lamps with too much wattage. The black unit, made by Hunter, turned out to be a current-limiting device for the lights that are part of the fan assembly. There was a circuit board covered with a plastic cover, and a mystery black device similar to a relay (Fig. The inside of the fan had an electronics package above the motor (Fig. Since the fan had power and the remote transmitter seemed to work, it was time for a teardown. Next was to take the housing off the fan and measure that the ac voltage was actually reaching the fan. I confirmed there was ac going to the switch and bypassed it with a direct connection. Next is to remove the wall plate on the variable-speed switch. The LED on the remote would work, so the remote transmitter was not likely the problem. This old Casablanca fan remote used A23 size 12-V batteries, like many garage-door openers. New batteries in the remote are the first thing. It’s a little more frustrating when the fan has an RF remote control. Troubleshooting a dead ceiling fan is pretty straightforward. ![]()
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