Area C (the conversion temperature difference ±1℃)
If the system is in Area A, when ΔT＜1, change to Area B;
If the system is in Area C, when ΔT>1, change to Area B;
If the system is in Area B, when ΔT>3, change to Area A;
WhenΔT＜－1, change to Area C.
3.5 FAN mode control
The compressor and the outdoor motor will stop running, indoor motor can be set at high/med/low speed,
the fan blade can swing or stay at one position. In this mode, you can set the TIMER and SLEEP
function.
3.6 HEAT mode control
3.6.1 4-way valve control
a. 4-way valve being electrified after compressor has started for 3 seconds when heating for the first time,
then the 4-way valve will be electrified before compressor start;
b. Only in cooling(not heating) mode, 4-way valve and compressor will power off at the same time, the
4-way valve keeps being powered when shutoff, thermostat OFF and compressor stop .
Note: 4-way valve control is realized by outdoor unit for the unit with outdoor PCB, not concurrent
completely.
3.6.2 In heating mode, for every time the compressor startup (thermostat ON), within 6 minutes, the
4-way valve will not be limited by the temperature sensor, but for the set temperature change, shutoff
signal and the protection, the compressor can stop immediately without 6-minute limitation.
3.6.3 ΔT≥1 compressor running, indoor motor runs at anti-cold air mode;
ΔT≤-1 compressor stops, indoor motor runs at blowing remaining heat mode;
-1<ΔT<1 compressor retains original state
3.6.4 Overheat protection
Indoor coil temperature Tg>56℃, outdoor motor run in compulsory LOW and resume to normal HIGH
when Tg<54℃. Indoor coil temperature Tg＜40℃, outdoor motor run in compulsory HIGH and resume
to normal HIGH when Tg>42℃. Outdoor motor run in HIGH(normal state) when 40 ≤℃ Tg＜56℃.
In heating mode, compressor has started up and indoor motor has run for over 30 seconds, if indoor coil
temperature Tg>60℃, outdoor motor will stop; if Tg<56℃, and outdoor motor has stop for 45 seconds,
outdoor motor will run again; if Tg>68℃, the compressor will stop and indoor motor will run in thermostat
OFF. After the compressor stops for 3 minutes and Tg reduces to 48℃, the unit will resume to heating
mode, and the compressor and the outdoor motor will run again.
3.6.5 Temperature cutoff protection
In heating mode (besides the defrosting), the unit will check indoor coil temperature every time the
compressor has run for 5 minutes, when indoor coil temperature Tg＜Tr-5, the unit will stop and 3
minutes later restart up; if the temperature cutoff occurs for 3 times continuously, the unit will stop and
alarm(not check in defrost and within 3 minutes after defrost).
3.6.6 Anti-cold air function in heating mode
After entering heating mode, or last defrosting is over, the compressor will start up, if Tg＜28℃(HW_D2),
indoor motor will stop; if 38℃(HW_D1)>Tg≥28℃(HW_D2), indoor motor will run at low speed; if Tg≥38
℃(HW_D1) or the compressor has run for over 4 minutes, indoor motor will run at the set speed; once
the motor has started up, it will not stop because of Tg reduction.
3.6.7 Blowing remaining heat function
In heating mode, the thermostat is OFF, the compressor stops, indoor motor will run at low speed until Tg
＜28℃(HW_D3) and has run for 50 seconds at least. If Tg always over 28℃(HW_D3), compressor will
stop after running for at max. 3 minutes.
Electric control functions
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