Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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P00877Q
65
Caution for Insulation Resistance
If the total unit insulation resistance is lower than one megaohm, the compressor insulation
resistance may be lower, due to refrigerant being retained in the compressor. This can occur if the
unit has not been used over prolonged periods of time.
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itself. If the resistance value is over one megaohm, then an insulation failure has occurred in other
electrical parts.
2. If the insulation resistance is less than one megaohm, reconnect the compressor cables from the
inverter PCB. Then, turn on the main power to apply current to the crankcase heater.
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on the air conditions, length of piping, or refrigerant conditions, it may be necessary to apply the
current for a longer period of time.)
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Table 7.1.
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Interrupters (GFCI’s) breakers, wires, conduit connectors and wire terminals) have been properly selected
according to the electrical data shown in Table 7.1, and ensure that these components comply with national
and local electrical codes.
NOTICE