I did find a tech sheet for a FR8.5G compressor, it gives the winding resistances as 8.9 and 12 ohms. Hi guys, just to give an update. Repeat steps 1-11. “Ohming out a motor” is the process of measuring the electrical resistance of the motor windings and comparing that resistance to normal values. Use the higher resistance range on your meter to detect grounded windings. Single phase, 208/230 volt w/ danfoss scroll. In that case, insulation resistance of t he compressor will fall. Tell me a bit more about what's going on so we can help you best. 2 Fluke Corporation Insulation resistance and electrical testing for HVAC compressor motors What to look for There’s no hard and fast pass/fail rule for how to interpret insulation resistance values, but manu-facturers and agencies seem to agree that IRT trending can be a … This is where confusion often sets in. If the megger reads a resistance under 1 (1,000 ohms) on your meter after the initial 60-second interval, the cable has failed and the cable should be removed. I put it in, leak checked, pulled vacuum, dropped in factory charge (starting point for my charge,) now compressor wont start. Sensor resistance values change with temperature variations • Module will interrupt power to the contactor coil when resistance values of sensors exceed the specified range. Resistance between C and S is about 2.3 Ohms. Place compressor in operation for 5 or 10 minutes. Any reading above 1.25 is considered excellent. Real quick history on the unit, two weeks ago construction supervisor noticed leak in condensing coil, ordered part and sent me to install. On your unit (if I interpret the readings correctly) has winding resistances of 17.9 and 1.1 ohms with a series resistance of 18.8 If the megger reads a resistance between 1-1.25 on your meter, then the cable passes. The resistance readings between the 3 pins are 1.1 Ohms (between the compressor pins that are ultimately connected to the line voltage), 18.8 Ohms, and 17.9 Ohms. To check the clutch, remove the drive belt tension. This would be 20.9 ohms for the in series measurement. Verify that the refrigerant levels are correct. compressor oil and refrigerant. Record resistance value and terminal temperature. The breaker trips when the compressor starts. However, each make, model and size compressor will yield somewhat different values. If the compressor suffers a catastrophic internal failure, the shear pin or clutch plate breaks, separating the seized compressor from any other driven components. If the system is overcharged, the pressure in the system will naturally be higher than what it is supposed to be causing the discharge temperature to be higher. Contractor's Assistant: I'll do all I can to help. Therefore, please design the refrigerant pipeline so that liquid height of residual compressor oil and refrigerant maintained in the compressor above external bottom lower than 277mm. As richappy said it sounds like your compressor is toast. Hey guys, working on a 5 ton York split system straight cool at a fire station. When a motor experiences damage or malfunction, frequently the motor’s electrical resistance will deviate from what it’s normal value is. This method is good for detecting grounded or open windings and windings that are suspect (resistance too high). The resistance values can be found in the service manual for the corresponding unit. Manually rotate the direct-drive clutch and feel for a slight resistance or drag. This power interruption thus stops the compressor motor • Module provides protection against: • Abnormal locked rotor conditions • Loss of refrigerant • So the readings I get are not … What resistance value would tell you that a compressor is burnt? 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