Page 58
506601−01
XP21 Field Operational Checklist
Unit Readings
Cooling*** Heating***
Y1
First
Stage
Expected results
during Y2 demand
(Toggle switch On)
Y2
Second
Stage
Y1
First Stage
Expected results
during Y2 demand
(Toggle switch On)
Y2 Second
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 control 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 XP21 units, the System Operation Monitor controls the second−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.
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