Haier 3U19FS1ERA Service Manual - Page 83

Defrosting operation flow chart

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3.6.4 Defrosting operation flow chart beginning >_]]VbTZR\ _^UZdZ_^Vb end fixed frequency indicated FQY 60s compressor 0HZ 5s outdoor motor ON defrosting FQY 80 Hz（E） send defrosting signal to indoor 60s soft startup 0HZ Auto OFF 4-way valve ON OFF 15s 450-pulse all EEVs auto open angle all indoor motors ON OFF 350-pulse(E) 450-pulse auto open angle anti-cold air function 3.7Frequency 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. 120℃ 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. Discharging temp. TD 115℃ Reduce FQY rapidly 2HZ/S 110℃ Reduce FQY rapidly 1HZ/S 105℃ Reduce FQY slowly 1HZ/10S 100℃ Remain FQY 95℃ Increase FQY slowly 1HZ/10S -82-

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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
Discharging temp. 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
℃
±²³³´µ¶·¸¹ º·µ ±²»¼·½·²»´µ
-82-
3.6.4 Defrosting operation flow chart
3.7Frequency control when Td is too high