8.4.3.4 Defrosting mode
Condition of defrosting:
----T4＞0°C(32°F),
When the units are running, if the following two
items are satisfied, the units start defrosting:
The units run with T3＜3°C(37.4°F), for 40
minutes and T3 keeps lower than TCDI°C for
more than 3 minutes.
The units run with T3＜3°C(37.4°F) for 80
minutes and T3 keeps lower than
TCDI+2°C(35.6°F) for more than 3 minutes.
----T4＜0°C(32°F),
If the 1
st
condition and 2
nd
condition items are
satisfied, then the program judges if T2 has
decreased more than 5°C(41°F).When T2 has
decreased more than 5°C(41°F), enter the
defrosting mode.
----No matter what value T4 is, if the machine
runs with T3＜3°C(37.4°F) for more than 120
minutes and T3 keeps lower than
TCDI+4°C(39.2°F) for more than 3 minutes, the
machine will enter defrosting mode no matter if
T2 drops more than 5°C(41°F) or not.
Condition of ending defrosting:
If any one of the following items is satisfied, the
defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE1°C.
----T3 keeps to be higher than TCDE2°C for 80
seconds.
----The machine has run for 10 minutes in
defrosting mode.
Defrosting action：
For 9k,12k models:
XX=90.
8.4.3.5 Evaporator coil temperature
protection
----T2> TEH2 °C, the compressor running
frequency decreases to the lower level and
runs for 20s.
When the frequency decreases to F2 and the
T2 is still over TEH2 °C for 3 minutes, the
compressor will stop.
----T2<48°C(118.4°F) or T2 stays in
48°C(118.4°F)~TEH2 °C for 6 minutes, the
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