Haier AS24NE3HAA Service Manual page 17

When Tr Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as
in cold blast mode, and 4
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
*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 runnig 10
seconds earlier than compressor does. After compressor stops runnig, 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 prevetion:
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
motor is running at the preset wind speed.
7.1.5.1.3 If the temperature of coil pipe is above 38
running at the preset wind speed.
7.1.5.1.4 If coil pipe descends to the temp. lower than 38
preset wind speed.
*Warm blast: If the temperature sensor is off. Compressor stops runnig. If the temperature of coil
pipe is above 23 , fan motor enter breeze mode; and if the temperature of coil pipe is below 20 , fan
motor stops running.
7.1.5.2 High temperature protection and high temperature expiration protection:
7.1.5.2.1 High temperature prevention: When the temp. of coil pipe is above 56 , the outdoor
fan motor stops.When the temp descends to 52 , the outdoor fan motor is restarted and fan speed
invertage frequence is more than 45 seconds.
7.1.5.2.2 High temperature expiration prevention:When the temp.of coil pipe is above
62 ,compressor and outlet air stop running 10 seconds later, and inlet air runs as the temp. sensor is off.
When compressor stands by for 3 minute and the temp. of coil pipe is below 50 , the unit can be started
again.
*Current protection and current expiration protection: (Not detecting within 60 seconds after start up)
*Overcooling protection One and half a minutes later after compressor starts, if the temperature of
of compensation is added after compressor is started.
Ts, the wind speed is high;
Ts+2 , the wind speed is medium.
When Ts Tr
When Ts+2 Tr, the wind speed is low.
4 minutes later after start up, fan
4 minutes later after start up, fan motor is
from 38 . fan motor is running at the
15
Functions and control
Domestic air conditioner