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5.2.2 Outdoor fan control
Compressor startup within 3min ,outdoor fan speed control as follows:
Outdoor
Temperature
Cooling/
Dehumidification
Heating
fter compressor runs 3min ,outdoor fan speed control as follows:
Cooling/ Dehumidification:
Compressor Operation Frequency（Hz）
32 ∽38
Tao（℃）
Heating:
Compressor Operation Frequency（Hz）
≤4
Tao（℃）
Compressor shutdown and outdoor fan residual heat blow process
When compressor shuts down in cooling mode, outdoor fan automatically jumps to low speed and
blows residual heat for 30s and stop.
5.2.3 Four-way Valve Control
Defrosting Four-way Valve Control，(please see defrosting process for details)
Time sequence of the defrosting operation is as follows:
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.
5.2.4 Outdoor Defrosting Control
Defrosting Mode Entry Conditions
The unit will enter defrosting mode when compressor starts up and operates for 10 minutes
continuously in heating mode or after compressor runs for an accumulated time of 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:
18 2 HVA103/R2(DB)
<10
Low
High
23∽32
<23
≥38
4∽18
≥18
TE≤C×TA－α
10∽25
Low
Low
<25
25∽45
Low
Low
Low
High
<25
25∽45
Low
Low
Low
2
≥25
High
Low
≥45
High
High
Low
High
≥45
High
High
Low
High
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