Haier AU282XHERA - Heating Operation Control Flowcharts; Defrosting Operation Flow Chart; Frequency Control for High Discharge Temp.

3.8 Frequency control when Td is too high
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
ON
Spray valve SV2 OFF
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
g
in
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℃
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3.7.4 Defrosting operation flow chart
94-