Haier HSU-22H03/R2DB - Page 27

When one of the following conditions is met, defrosting operation will be switched to
heating operation.
（1）:Temperature of outdoor heat exchanger exceeds 7 for 80s continuously℃
（2）:Temperature of outdoor heat exchanger exceeds 12 for 5s continuously℃
（3）:Defrosting operation continues for 9 minutes.
E. When defrosting exit conditions are met, the unit will operate as follows
Compressor stops and external fan starts, 50s later, four-way valve will be on, 60s
later, compressor will operate as per startup process.
1.6:PTC Output Control
z When outdoor unit is energized, PTC output value is 0, 10s later, output value is 1.
z When compressor stops for 10 minutes continuously, PTC output value is 0.
z On receiving compressor startup instruction, initial PTC output is 1, and compressor
startup will be performed 5s later.
Two. System Protection Function
2.1:Time interval between compressor shutdown and restart is set at 3 minutes to ensure that
compressor will only restart after 3-minute shutdown and initial energization valves are turned on
to adequate opening position after being fully turned off.
2.2:TD High Temperature Protection
As long as unit is on, the TD air discharge overheat protection feature will be activated, yet
air discharge sensor fault must be alarmed 4 minutes after compressor starts.
TD（℃）
Abnormal Shutdown
117
rapid frequency drop（1HZ/s）
109
slow frequency drop (1HZ/10s)
98
invariable frequency
93
frequency rise (1HZ/10s)
9 0
frequency rise（1HZ/1s）
When TD>117 for 20s continuously℃ ，air discharge overheat protection will be activated and
fault will be reported to indoor unit.
In other protection features, there is no continuous allowance.
2.3: Indoor unit TC high temperature prevention and control in heating mode:
Indoor heat exchanger sensor will check temperature of indoor heat exchanger, if the
temperature is higher than 55 ,℃ compressor rotate speed will be reduced to activate indoor heat
exchanger high temperature protection. When temperature of indoor heat exchanger falls below
48 , normal control will be resumed. ℃
TC
65
P Slow Drop
55
Q Maintain
52
48
R Slow Rise
P: Drop at the speed of 1Hz/10s
Model: HSU-22H03/R2(DB)Domestic Air Conditioner
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