Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

17 PB
OPERATION
Function and Control
Buttons and Display
1) Buttons
There are ON/OFF, UP, DOWN, HEAT, COOL, CONSTANT FAN and fan speed of HIGH, LOW, AUTO buttons.
1. ON/OFF: Press to turn power on or off to the unit.
2. COOL, HEAT: choose the mode of operation
3. HIGH, LOW, AUTO: choose the fan speed.
4. UP, DOWN: Adjust the setting temperature , default: 60-90°F(16~32°F).
2) Dual 8 Digital Tube Displayer and LED
Two 8 digital tube and 7 LEDs (ON/OFF, HIGH, LOW, AUTO, HEAT, COOL, CONSTANT FAN)
1. Mode LED display: when the unit is running in a certain mode, the corresponding LED is lit up.
2. ON/OFF LED: at ON status, the LED is lit up.
3. CONSTANT FAN LED: when this function is enabled, the LED is lit up.
4. Fan speed LED: when the unit is running at HIGH, LOW or AUTO fan speed, the corresponding LED is litup.
5. Dual 8 digital tube displayer: normally, it displays the indoor ambient temperature. When the UP/DOWN
button is pressed it displays the setting temperature. When some error occurs, it displays the ERROR CODE.
Temperature Denition
Indoor setting temperature (Ts)
Indoor ambient temperature (T1)
Indoor coil temperature (T2)
Outdoor coil temperature (T3)
Outdoor ambient temperature (T4)
Compressor discharge temperature (T5)
Indoor outlet air temperature (T6)
System Basic Function
Once the compressor starts, the compressor won’t stop with the change of the indoor temperature. Once the
compressor stops, it can only start after a 3 mins delay. (The compressor can stop immediately at the time of mode
switchover, turning off the unit, adjusting setting temperature and turning off from a function error.) Depending on the
different ambient temperatures and setting temperatures, the compressor runs at different frequencies to achieve
the best energy savings and comfort. This is the advantage over traditional A/C compressors.
1) Cooling Mode
Working conditions and process for cooling:
When T1≥Ts+2°F(1°C), cooling turns on.
When T1≤Ts-2°F(1°C), cooling turns OFF.
When Ts- 2°F(1°C)<T1<Ts+ 2°F(1°C), the unit keeps previous running status.
Indoor fan control in cooling mode:
The indoor fan will run synchronously with cooling demand. During no demand period if the CONSTANT FAN
button is turned off, it will run for 30s and then turn off..When CONSTANT FAN is ON, it will always be running.
Outdoor fan control in cooling mode:
The outdoor fan has two speeds, low and high. When T4 is above 80°F, the fan operates in high speed.
When T4 drops to 77°F the fan operates in low speed.
2) Heating Mode
Working conditions and process for heating:
When T1≤Ts -2°F(1°C), the unit is running in heating mode. The heat pump or electric heating will start
depending on the ambient temperature condition
When T1≥Ts+ 4°F(2°C), the heating is turned OFF.
When Ts-2°F(1°C) <T1<Ts+ 4°F(2°C), the unit keeps at the previous running status.
Electric heater does not work with heat pump at the same time.
When T4>44°F 7°C, unit will run heat pump all the time.