Haier N Series Service Manual page 18

When all the ranges alternate, there is ±1℃difference.
7.1.5 Heating mode:
*Temperature control range : 16℃—30℃
*Temperature control precision: ±1℃
*Control Character:
When Tr ≤ Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as in cold blast
mode, and 4℃ of compensation is added after compressor is started.
When Tr＞Ts+5℃, compressor is off, and the indoor fan motor runs as in warm blast mode.
When Tr≤Ts+5℃, compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor runs as in
the mode of avoiding cold blast.
*Control of indoor fan motor:
Manual operation: The wind speed can be set to high, medium, low or automatic as required.
Automatic operation: When Tr < Ts, the wind speed is high;
*Control of air door: setting the position of air door as required.
*Compressor control：The compressor can't be controlled by temperature sensor in 2 minutes after start up and
also can't be started again at least 3 minutes later after shut down. There are 3-minute protection with power on for the
first time (over 3 minutes with power off). The compressor must be started again 3 minutes later after shut down.
*Avoiding electrical shock: outlet air is available 2 seconds later after start up.
*Timer on, Timer off and sleep control are available.
*Control of 4-way valve: When the unit is started for the first time, the 4-way valve starts running 10 seconds earlier
than compressor does. After compressor stops running, the 4-way valve continues running for 2 minutes and then
stops. If changing the unit from heating to cooling, the 4-way valve is shut off 2 minutes later and compressor is started
3 minutes later .
7.1.5.1 Cold draft prevention:
7.1.5.1.1 Compressor is interrupted during the defrosting operation and continues to run after defrosting is
completed. When the indoor exchanging temperature is below 23℃, the indoor fan motor is off. When the indoor
exchanging temperature is above 23℃, the indoor fan motor is running at weak speed.
7.1.5.1.2 If the temperature of coil pipe can't be above 38℃ 4 minutes later after start up, fan motor is running at
the preset wind speed.
7.1.5.1.3 If the temperature of coil pipe is above 38℃ 4 minutes later after start up, fan motor is running at the
preset wind speed.
7.1.5.1.4 If coil pipe descends to the temp. lower than 38℃ from 38℃. fan motor is running at the preset wind
speed.
State2
State3
Ts-1 Ts
(cooling only have no the mode)
When Ts ≤ Tr< Ts+2℃, the wind speed is medium.
When Ts+2 ℃ ≤ Tr, the wind speed is low.
State1
Ts+2
Ts+2
16
Functions and Control
Domestic air conditioner