Purpose: make compressor frequency control if the discharging temp. is too high, to lower the discharging
temp. efficiently and ensure the system can run normally.
beginning
end
fixed frequency
indicated FQY 60s
defrosting FQY 80 Hz
(
E
)
60s soft startup
compressor
0HZ
0HZ
5s
outdoor motor ON
send defrosting signal to indoor
Auto
OFF
4-way valve ON
OFF
15s
450-pulse
450-pulse
350-pulse(E)
all EEVs auto open angle
auto open angle
all indoor motors ON
OFF
anti-cold air function
Dischar
gin
g tem
p. TD
If keeping for 10s, the unit stops, 3 minutes later, the unit can
re-startup. If in 60 minutesthe unit occurs alarm for 3 times, the
failure can be eliminated.
Reduce FQY rapidly 2HZ/S
Reduce FQY rapidly 1HZ/S
Reduce FQY slowly 1HZ/10S
Remain FQY
Increase FQY slowly 1HZ/10S
120
℃
115
℃
110
℃
105
℃
100
℃
95
℃
-82-
3.6.4 Defrosting operation flow chart
3.7Frequency control when Td is too high
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