Lennox XP19 User Manual

Page 32
505331M 06/09
XP19 Field Operational Checklist26
Unit Readings
Cooling*** Heating***
Y1 − 1st-
Stage
Expected results
during Y2 demand
(Toggle switch On)
Y2 − 2nd-
Stage
Y1 − 1st-
Stage
Expected results
during Y2 demand
(Toggle switch On)
Y2 − 2nd-
Stage
Compressor
Voltage Same Same
Amperage Higher Higher
Condenser Fan motor
Amperage Same or Higher Same or Higher
Temperature
Ambient Same Same
Outdoor Coil Discharge Air Higher Lower
Compressor Discharge Line Higher Higher
Indoor Return Air Same Same
Indoor Coil Discharge Air Lower Higher
Pressures
Suction (Vapor) Lower Down
Liquid Higher Higher
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 Address
Indoor Unit Model Serial
Outdoor Unit Model Serial
Notes:
START−UP CHECKS
Refrigerant Type:
Rated Load Amps Actual Amps Rated Volts Actual Volts
Condenser Fan Full Load Amps Actual Amps:
COOLING MODE
Vapor Pressure: Liquid Pressure:
Supply Air Temperature: Ambient Temperature: Return Air Temperature:
HEATING MODE
Vapor Pressure: Liquid Pressure:
Supply Air Temperature: Ambient Temperature: Return Air Temperature:
System Refrigerant Charge (Refer to manufacturer’s information on unit or installation instructions for required subcooling 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 Temp. Drop (18 to 22°F) A

B
=
COIL TEMP DROP
Return Air Temperature (A)
minus Supply Air Temperature (B)

Lennox XP19 Specifications

General

Brand	Lennox
Model	XP19
Category	Heat Pump
Language	English