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Outdoor Unit Functions
PROTECTION CONTROLS
Discharge Temperature Control / Inverter Protection Control
Temperature Range Compressor Subcooling EEV Indoor Unit EEV
Tdis > 230°F Off SC, SH Decrease Control SH Decrease Control
Tdis > 226.4°F -5 Hz / 10 seconds SC, SH Decrease Control SH Decrease Control
Tdis ≥ 221°F Frequency Hold* SC, SH Decrease Control SH Decrease Control
Tdis ≤ 212°F Normal Control SC, SH Decrease Control SH Decrease Control
Tdis > 212°F Normal Control SC, SH Decrease Control SH Decrease Control
Discharge Temperature Control
Table 16: Outdoor Unit Discharge Temperature Control.
* Frequency Hold = Frequency (or RPM) is not increasing (can decrease).
Tdis = Temperature Discharge.
SC = Subcooling.
SH = Superheating.
Inverter Protection Control
Table 17: Inverter Protection Control in Cooling Mode.
System Voltage
Type
Normal System Operation Frequency Will Drop System Will Stop Operation
4.8 HP 6.8 HP 4.8 HP 6.8 HP 4.8 HP 6.8 HP
Heat Pump Outdoor Units
AC Input Current
208-230V less than 19A less than 28A more than 19A more than 28A more than 24A more than 32A
460V less than 22A less than 30A more than 22A more than 30A more than 22A more than 32A
Compressor Current
208-230V less than 24A less than 35A more than 24A more than 35A more than 30A more than 41A
460V less than 24A less than 35A more than 24A more than 35A more than 30A more than 41A
Heat Recovery Outdoor Units
AC Input Current
208-230V less than 19A less than 28A more than ≥19A more than 28A more than 24A more than 32A
460V less than 22A less than 30A more than ≤22A more than 30A more than 22A more than 32A
Compressor Current
208-230V less than 24A less than 35A more than ≥24A more than 35A more than 30A more than 41A
460V less than 24A less than 35A more than ≤24A more than 35A more than 30A more than 41A
System Voltage
Type
Normal System Operation Frequency Will Drop System Will Stop Operation
4.8 HP 6.8 HP 4.8 HP 6.8 HP 4.8 HP 6.8 HP
Heat Pump Outdoor Units
AC Input Current
208-230V less than 19A less than 28A more than 19A more than 28A more than 24A more than 32A
460V less than 22A less than 30A more than 22A more than 30A more than 22A more than 32A
Compressor Current
208-230V less than 24A less than 35A more than 24A more than 35A more than 30A more than 41A
460V less than 26A less than 35A more than 26A more than 35A more than 30A more than 41A
Heat Recovery Outdoor Units
AC Input Current
208-230V less than ≤19A less than 28A more than 19A more than 28A more than 24A more than 32A
460V less than ≤22A less than 30A more than 22A more than 30A more than 22A more than 32A
Compressor Current
208-230V less than ≤24A less than 35A more than 24A more than 35A more than 30A more than 41A
460V less than ≤26A less than 35A more than 26A more than 35A more than 30A more than 41A
Table 18: Inverter Protection Control in Heating Mode.
The tables below display the amperage where the system will operate normally, the amperage where the inverter protection control will cause
the frequency to drop, and the amperage where the inverter protection control will shut the system off. AC input current is measured at the
inverter compressor (after the point where the current passes through the noise filter).
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