Haier 1U48IN1EAB, Service Manual

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Single Split
29
ΔT
＞
2, the compressor and the outdoor motor will run continuously, indoor motor will run at the set
speed, this area is defined as Area A;
0≤ΔT≤2, the compressor and the outdoor motor will always run for 10 minutes and then stop for 6
minutes, indoor motor will be LOW speed, this area is defined as Area B;
ΔT
＜
0, the compressor and the outdoor motor will stop, indoor motor will run at Low speed, this
area is defined as Area C.
(2) After the unit is running in DRY mode, the system will change over among Area A, Area B, and
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
(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 COOL / DRY/ FAN (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.
(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) 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
(4) Overheat protection
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
℃
lasts 10 seconds, the compressor will stop and
indoor motor will run in thermostat OFF. After the compressor stops for 9 minutes and Tg reduces to
48
℃
, the compressor and the outdoor motor will run again.