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)
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