Page 51
XP16
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
XP16 Start−Up and Performance
Customer
Address
Indoor Unit Model
Serial
Outdoor Unit Model
Serial
Notes:
START UP CHECKS
Refrigerant Type:
1st Stage: Rated Load Amps
Actual Amps
Rated Volts
Actual Volts
2nd Stage: Rated Load Amps
Actual Amps
Rated Volts
Actual Volts
Outdoor Unit Fan Full Load Amps
Actual Amps: 1st Stage
2nd Stage
COOLING MODE
Suction Pressure:
1st Stage:
2nd Stage:
Liquid Pressure:
1st Stage:
2nd Stage:
Supply Air Temperature:
1st Stage:
2nd Stage:
Temperature:
Ambient:
Return Air:
System Refrigerant Charge (Refer to manufacturer’s information on unit or installation instructions for required subcool-
ing and approach temperatures.)
Subcooling:
A
B
=
SUBCOOLING
Saturated Condensing Temperature (A)
minus
Liquid Line Temperature (B)
Approach:
A
B
=
APPROACH
Liquid Line Temperature (A)
minus
Outdoor Air Temperature (B)
Indoor Coil Temperature Drop (18 to 22°F)
A
B
=
COIL TEMP DROP
Return Air Temperature (A)
minus
Supply Air Temperature (B)
