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For update−to−date information, see any of the following
publications:
S Lennox XP16 Engineering Handbook
S Lennox Product Catalog
S Lennox Price Book
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
OUTDOOR UNIT 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