You will have three test leads. Maintenance, Troubleshooting Is my sub panel grounding correct( with diagram) ? 3) Allow the compressor to warm up and boil off the refrigerant if it is below 70 degrees. Is th start contact staying on or is there some thing else ? View our Privacy Policy here. There is another current measurement that should be made. If there is a START KIT (D) in the circuit, the current will be momentarily high. Place the grille aside. Your tech needs to perform a thorough diagnostic to see why you are getting the flash code. Keep in mind though that R-22 will be phased out in the next 3 -4 years and will become very expensive if you ever need to add some to the existing system. (Unless you own a machine shop) Proper replacement of A/C compressor is not a job for a novice. 3.5 Missing phase protection Remove the terminal cover from the compressor, and yes you may have to remove the fan motor to get to this. The start lead current (amps) measurement, give a good indication of the condition of the capacitor. If it runs with those low amps, it’s not a LRA problem. They hired a contractor to do it and its been nothing but problems ever since. An air conditioner or heat pump compressor pulls a high amp draw on startup, which is technically called locked rotor amps. Locked Rotor current and Starting current of induction motor seems to be the same thing at first glance but it is not so. On reciprocating compressors, usually the crankshaft or a piston has broken. Installed new compressor with added suction filter dryer and all OK, no acid found and suction dryer has no increase in pressure drop after a few hours running, so system not contaminated by the failure. The current draw in AMPS during compressor motor start-up can also be compared to the unit's specified LRA or "lock rotor amps" found also on the data tag we describe above. Note: Pressing the reset will require a pin or mini/electronics screwdriver. we never had a communicating controller and it works for 4 months and then just stops? The voltage under load should not drop more than 10%. ( Log Out /  Just driving and then loud buzzing alarm noise in car! A dirty evaporator will cause the suction pressure to drop. The rotor may resist coming off due to corrosion on the back side. Troubleshooting, Heat Pump, AC ; In this video, I demonstrate how to properly diagnose a locked up compressor. No mention of a 4 fault code. is the rated amp draw of a motor on start ups and lasts for 2 to3 seconds and is checked by a amp meter. Study Fig. Follow the terminal repair kit's instructions, paying special attention to the kit's wire-splice instructions. An open between common and start or common and run is an indication of an open overload. I've done it a long time ago with 2 capacitors and a single pole, double throw momentary switch, but I can't remember how to wire it Submitted: 11 years ago. The start lead current (amps) measurement, give a good indication of the condition of the capacitor. Double the … 3 Compressor Protector Tripped Detect using current 4 Locked Rotor Lockout on 4th successive locked rotor trip 5 Demand Signal Loss Capacity Req < 0.5VDC, shut down 6 Discharge Thermistor Fault Wires broken, Cf %Capacity forced to max 50% 7 Future 8 Welded Contactor Detect using current 9 Low Supply Voltage Supply voltage < 19VAC, shut down Use rated compressor line voltage. Then use a slip-joint pliers or small pipe wrench to remove the quick-connect fitting, pressure regulator and gauge from the pressure switch. ( Log Out /  So then he just came back and replaced the thermostat because he said thats what would cause it to do that. An AC compressor contains a motor with start and run windings. (Refer to figure 1 below to follow the description). If you are working on a 120-V compressor, you can try to energize the compressor with 220V. Initial alarm will be “Trip” alarm with autoreset and 10 consecutive trip alarms will result in “Lockout” alarm which requires manual reset. I kindly said no thanks. The last measurement which should be made is a voltage check. First he used the wrong breaker and it was crackling and we had to call and get it replaced......then it would run and the inside would cut off, but the outside wouldn't and it was running all day while I was at work. As far as the coil leaking,if it is refrigerant, it is going to need to be replaced. Tamrotor offers compressed air solutions for various applications, for example rock drilling, industrial and portable air compressor solutions, vehicle and mobile applications, oil drilling and firefighting equipment. ■ Remove wiring from the compressor motor terminals. Flash codes are just a “diagnostic” to lead someone in a certain direction. An open reading between run and start is a bad compressor. Armana Outside Unit…..very confused here. Then open the drain valve at the bottom of the tank to depressurize it. I came home to find the outside unit with frost all over it.So it melted and got all over the floor outside in the storage closet. He never touched the Start / Run cap as I had changed that and it was new (for exactly the same that was in there). Start windings parts suppliers so then he just came back and replaced the thermostat because said... Wordpress.Com account line so that you can try to energize the compressor comes up to you WordPress.com account the.! At my apt and they replaced the thermostat because he said thats what would cause it to do.! Draw of a dual stage repair, replace a/c clutch if it is only good for a Quote. May resist coming off due to voltage drop ) Diagnosing locked rotor diagnostic control in your below... 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