Haier HSU-22LEA03 Service Manual page 15

*Temperature control range : 16
*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 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.
*Cold draft prevetion:
(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.
(2)If the temperature of coil pipe can't be above 38
the preset wind speed.
(3) If the temperature of coil pipe is above 38
preset wind speed.
(4)If coil pipe descends to the temp. lower than 38
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.
*High temperature protection and high temperature expiration protection:
(1)High temperature prevention: When the temp. of coil pipe is above
stops.When the temp descends to
more than 45 seconds.
(2)High temperature expiration prevention:When the temp.of coil pipe is above 72 ,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 64 , 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 coil pipe
HSU-22L/HEA03
30
When Ts Tr Ts+2 , the wind speed is medium.
When Ts+2 Tr, the wind speed is low.
, the outdoor fan motor is restarted and fan speed invertage frequence is
4 minutes later after start up, fan motor is running at
4 minutes later after start up, fan motor is running at the
from 38 . fan motor is running at the preset wind
12
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Functions and control
, the outdoor fan motor
Domestic air conditioner