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XP19 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
Note − Heat pump may have a low ambient control or DCB that locks in second stage below its set point. It may be necessary to remove a wire from
the control when performing this check out.
**
On the XP19 units, the Lennox System Operational Module controls the 2nd stage solenoid coil in compressor.
***
Cooling Mode Operation − Block outdoor coil to maintain a minimum of 375 psig during testing.
Heating Mode Operation − Block indoor coil to maintain a minimum of 375 psig during testing.
XP19 Start−Up and Performance Checklist27
Customer
Indoor Unit Model
Outdoor Unit Model
Notes:
START−UP CHECKS
Refrigerant Type:
Rated Load Amps
Condenser Fan Full Load Amps
COOLING MODE
Vapor Pressure:
Supply Air Temperature:
HEATING MODE
Vapor Pressure:
Supply Air Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach
temperatures.)
Subcooling:
Saturated Condensing Temperature (A)
Approach:
Indoor Coil Temp. Drop (18 to 22°F)
505331M 06/09
26
Cooling***
Expected results
Y1 − 1st-
during Y2 demand
Stage
(Toggle switch On)
Same
Higher
Same or Higher
Same
Higher
Higher
Same
Lower
Lower
Higher
Actual Amps
Actual Amps:
Liquid Pressure:
Ambient Temperature:
Liquid Pressure:
Ambient Temperature:
minus Liquid Line Temperature (B)
Liquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Return Air Temperature (A)
minus Supply Air Temperature (B)
Y2 − 2nd-
Y1 − 1st-
Stage
Stage
Address
Serial
Serial
Rated Volts
Return Air Temperature:
Return Air Temperature:
A
A
A
Page 32
Heating***
Expected results
during Y2 demand
(Toggle switch On)
Same
Higher
Same or Higher
Same
Lower
Higher
Same
Higher
Down
Higher
Actual Volts
B
SUBCOOLING
=
B
APPROACH
=
B
COIL TEMP DROP
=
Y2 − 2nd-
Stage
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