69 PB
OPERATION
Control Functions
1. Cooling Anti-Freeze Protection
The outdoor pressure sensor functions as real time temperature detector of evaporator. It prevents the indoor unit evaporator temperature becoming
too low. If the indoor coil temperature is too low, the compressor will automatically start protection mode.
2. Overload Protection
To prevent system overload caused by excessive pressure, the machine will implement real‑time detection when outdoor coil temperature is too high
during cooling mode or indoor coil temperature is too high during heating mode.
3. Exhaust temperature protection
To prevent deterioration due to high exhaust temperature of compressor, the machine will recognize the real‑time detection of the exhaust gas
temperature. If the temperature is too high compressor provides automatic protection.
4. Oil-return Control
When the compressor runs at low frequencies for a long time, control system will start the oil‑return mechanism. The oil in the system returns to
the compressor.
5. Operation Mode
Air conditioning mode is the operation mode set by users through the thermostat, two modes are available: cooling, heating.
6. Four-way Valve Control
Four‑way valve of the outdoor unit is de‑energized during cooling and defrost and energized during heating. After the call for heat is satisfied and the
compressor has stopped the four‑way valve will de‑energized after a period of time.
7. Start-up Protection
To prevent compressor from restarting frequently when the system pressure has not been completely balanced, it cannot be restarted within 3
minutes.
8. Pressure Protection
When the pressure increases to a preset value, the pressure switch will automatically come to protection mode. The compressor will stop and report
the fault code protection. 24‑36k BTU units d not have a high or low pressure switch. Pressure data is transmitted through a pressure sensor.
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