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Checklists
Two−Stage Modulation Compressors Field Operational Checklist
Unit Readings Y1 − First Stage
Expected results during Y2
demand (Toggle switch On)
Y2 − Second Stage
COMPRESSOR
Voltage Same
Amperage Higher
CONDENSER FAN MOTOR
Amperage Same or Higher
TEMPERATURE
Ambient Same
Outdoor Coil Discharge Air Higher
Compressor Discharge Line Higher
Indoor Return Air Same
Indoor Coil Discharge Air Lower
PRESSURES
Suction (Vapor) Lower
Liquid Higher
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