Page 28
Checklists24
Field Operational Checklist25
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 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.
Start−Up and Performance Checklist26
Customer Address
Indoor Unit Model Serial
Outdoor Unit Model Serial
Solar Module Mfg and 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 = SUBCOOLINGSaturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Approach:
A B = APPROACHLiquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Indoor Coil Temp. Drop (18 to 22°F)
A B = COIL TEMP DROPReturn Air Temperature (A)
minus Supply Air Temperature (B)
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