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507163-01 05/13
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
Start-Up and Performance Checklist
Job Name
Job no.
Date
Job Location
City
State
Installer
City
State
Unit Model No.
Serial No.
Service Technician
Nameplate Voltage
Rated Load Ampacity
Compressor
Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Indoor Filter clean?
Supply Voltage (Unit Off)
Indoor Blower RPM
S.P. Drop Over Indoor (Dry)
Outdoor Coil Entering Air Temp.
Discharge Pressure
Suction Pressure
Refrigerant Charge Checked?
Refrigerant Lines:
Leak Checked?
Properly Insulated?
Outdoor Fan Checked?
Service Valves:
Fully Opened?
Caps Tight?
Thermostat
Voltage With Compressor Operating
Calibrated?
Properly Set?
Level?
