Lennox Signature XP21 Series Installation And Service Procedure page 60

Table 27. Two−Stage Modulation Compressor Field Operational Checklist
Two−Stage Modulation Compressors Field Operational Checklist
Unit Readings
COMPRESSOR
Voltage
Amperage
CONDENSER FAN MOTOR
Amperage
TEMPERATURE
Ambient
Outdoor Coil Discharge Air
Compressor Discharge Line
Indoor Return Air
Indoor Coil Discharge Air
PRESSURES
Suction (Vapor)
Liquid
XP21
Expected results during Y2
demand (Toggle switch On)
Y1 − First Stage
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Same
Higher
Same or Higher
Same
Higher
Higher
Same
Lower
Lower
Higher
Y2 − Second Stage