In that case, insulation resistance of t he compressor will fall. I had a look at the data sheet of the compressor (NJ2212GK) and the resistance rating for the start winding is 7.25 ohms, the rated resistance value for the run winding is 1.95 ohms. 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 … compressor oil and refrigerant. 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. Manually rotate the direct-drive clutch and feel for a slight resistance or drag. * Most compressor motor windings have a common connection internal to the compressor, so windings can't be isolated. I put it in, leak checked, pulled vacuum, dropped in factory charge (starting point for my charge,) now compressor wont start. Record resistance value and terminal temperature. If the compressor suffers a catastrophic internal failure, the shear pin or clutch plate breaks, separating the seized compressor from any other driven components. This would be 20.9 ohms for the in series measurement. Hey guys, working on a 5 ton York split system straight cool at a fire station. So the readings I get are not … Remove shunt across compressor terminals and restore to proper electrical connections. The resistance values can be found in the service manual for the corresponding unit. 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 As richappy said it sounds like your compressor is toast. Repeat steps 1-11. Tell me a bit more about what's going on so we can help you best. 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. 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. Real quick history on the unit, two weeks ago construction supervisor noticed leak in condensing coil, ordered part and sent me to install. Use the higher resistance range on your meter to detect grounded windings. When a motor experiences damage or malfunction, frequently the motor’s electrical resistance will deviate from what it’s normal value is. Hi guys, just to give an update. I did find a tech sheet for a FR8.5G compressor, it gives the winding resistances as 8.9 and 12 ohms. Sensor resistance values change with temperature variations • Module will interrupt power to the contactor coil when resistance values of sensors exceed the specified range. This is where confusion often sets in. To check the clutch, remove the drive belt tension. This power interruption thus stops the compressor motor • Module provides protection against: • Abnormal locked rotor conditions • Loss of refrigerant • If the megger reads a resistance between 1-1.25 on your meter, then the cable passes. What resistance value would tell you that a compressor is burnt? Contractor's Assistant: I'll do all I can to help. “Ohming out a motor” is the process of measuring the electrical resistance of the motor windings and comparing that resistance to normal values. Verify that the refrigerant levels are correct. The breaker trips when the compressor starts. Place compressor in operation for 5 or 10 minutes. Single phase, 208/230 volt w/ danfoss scroll. 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