Haier HBU-18HF03 Manual page 236

Electric control functions
3.2 For outdoor unit
1. Outdoor motor control
When the system does not occur overcooling, overheating, and over current protections, the
outdoor motor will occur the below changes according to the outdoor ambient temperature and
indoor coil temperature.
1.1 General information
Outdoor motor is 2-speed type: high, low and stop.
The fan speed will change unless every step has been run for 45 seconds.
1.2 Cooling mode
1.2.1 Indoor coil temp.≥15℃, outdoor motor runs at high speed.
1.2.2 Indoor coil temp.＜5℃, outdoor motor runs at low speed.
1.2.3 5℃≤Indoor coil temp.＜15℃, outdoor motor will change due to the outdoor ambient temp.
Outdoor ambient temp. ＞28℃, enter high speed; outdoor ambient temp.＜26℃, enter high speed;
26≤outdoor ambient temp.≤28℃, keep the current speed.
In running, the system will be controlled as 2℃ temperature tolerance; if outdoor ambient temp. ＜
26℃, enter low speed; if outdoor ambient temp.＞28℃, enter high speed.
1.3 Heating mode (heat pump model)
1.3.1 Indoor coil temp.≥50℃, outdoor motor will run at low speed.
1.3.2 Indoor coil temp. ＜40℃, outdoor motor will run at high speed.
1.3.3 40℃≤indoor coil temp.＜50℃, outdoor motor will change with outdoor ambient temp.
Outdoor ambient temp.＜13℃, enter high speed; Outdoor ambient temp.＞15℃, enter low speed;
13≤Outdoor ambient temp.≤15℃, keep the current speed;
In running, the system will be controlled as 2℃ temperature tolerance; if outdoor ambient temp. ＜
13℃, enter high speed; if outdoor ambient temp.＞15℃, enter low speed.
Every step will run at least 45 seconds, and the motor will start up 2 seconds earlier than
compressor.
2. Defrost control
2.1 Defrosting condition
In heating mode, the compressor will run for 30 minutes continuously or run for 45 minutes in all
and for over 5 minutes contineously, outdoor motor at least runs for 2 minutes; If the outdoor
ambient temperature and outdoor coil temperature can comply with the shadow area in the figure
and keep for 1 minute, the defrost will work and send defrost signal to indoor unit, then indoor unit
will control indoor motor accordingly.
2.2 Quit condition
Outdoor coil temp. arrives the defrost-end temp. 14℃ or the defrost time is over 12 minutes, the
defrost will finish and send signal to indoor unit.
2.3 Defrost operation
Compressor and outdoor motor stop, indoor motor stops meanwhile; 55 seconds later, the
reversing valve will close. Another 5 seconds later, compressor starts up.
After defrost is over, compressor stops, outdoor motor runs at high speed; 55 seconds later, the
reversing valve will open. Another 5 seconds later, compressor starts up and indoor motor runs at
anti-code mode.
Type 1: Standard defrost
1) If Tr≥-2℃, when Tp≤-6℃, enter defrost.
2) If -12℃≤Tr＜-2℃, when Tp≤-6℃, please refer to the following chart.
3) No matter the ambient temperature, when Tp≤-16℃, enter defrost.
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