Above 15℃ Low Wind Low Wind High Wind
Tao
Below 15℃ Low Wind High Wind High Wind
1.3: Four-way Valve Control
z Defrosting Four-way Valve Control，(please see defrosting process for details)
Time sequence of the defrosting operation is as follows:
Compressor
Outdoors fan motor
Four-way valve
60×9Max
z Four-way Valve Work Status in Other Modes:
In heating mode, four-way valve is on. If compressor is off or is switched to non-heating
mode, four-way valve ensures that it is off at least 2 minutes after compressor shuts down.
1.5 Outdoor Defrosting Control
A. Defrosting Mode Entry Conditions
The unit will enter defrosting mode when compressor starts up and operates for 10 minutes
continuously in heating mode and accumulated running time exceeds 45 minutes (Upon
completion of defrosting or when switched to cooling mode, compressor accumulated operation
time will be cleared) and when 2 minutes’ continuous checking by defrosting sensor TE (check
frosting condition of outdoor unit heat exchanger) and outdoor ambient temperature sensor TA
meets the following conditions:
TE≤C×TA－α
Among which :C:TA＜0℃，C=0.8
TA≥0℃，C=0.6
For area prone to frost, the value is set at 6 when unit leaves the factory.
Defrosting entry temperature control -15 ≤C×TA℃ －α≤-5℃
B. Defrosting Time Interval
z When data calculated by C×TA－αfalls into the range of -15 ≤C×TA℃ －α, time interval
between two defrosting cycles is 45 minutes.
z When data calculated by C×TA－αfalls into the range of C×TA－α<-15 , time ℃ interval
between two defrosting cycles is 65 minutes.
z C. Defrosting Operation
z When defrosting begins, compressor will stop for one minute, external fan is
running and 50s later, four-way valve will be off.
z When compressor starts, external fan will be off, compressor will run at 60HZ
for 60s then move on to target frequency of 88HZ.
z During defrosting, compressor current and air discharge overheat protection
features are effective. During defrosting, if compressor shuts down due to
activation of protection feature or due to malfunction, it will resume after 3
minutes. In the unit is still within defrosting cycle, it will resume defrosting and
startup of compressor will be based on the rule for defrosting startup. (The unit
will exit defrosting mode and handle fault in the event of 3 consecutive restart
failures.)
z On entering defrosting, it must guarantee that compressor will operate for a
minimum of 2 minutes in defrosting mode before exit.
D. Defrosting Exit Condition
Model: HSU-22H03/R2(DB)Domestic Air Conditioner
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