Midea MOB31-12HFN1-QRD0GW, Service Manual

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T 1 - T d
9.4.3.4 Defrosting mode
For MSAEAU-09HRFN1-QRD0GW,
MSAEAU-09HRFNX-QRD0GW,
MSAEBU-12HRFN1-QRD0GW,
MSAEBU-12HRFNX-QRD0GW,
MSAEBU-12HRFN1-QRD0GW(B),
MSAECU-18HRFN1-QRD0GW(S1),
MSAECU-18HRFNX-QRD0GW(S1) models,
AC will enter the defrosting mode according to
the value of temperature of T3, the value range
of temperature change of T3, the value of
temperature of T4 and also the compressor
running time.
During the defrosting mode, the compressor
keep running, indoor and outdoor motor will
stop, defrost lamp of the indoor unit will be
lighted “ .” will be displayed.
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
℃
.
----T3 keeps to be higher than TCDE2
℃
for 80
seconds.
----The machine has run for 15 minutes in
defrosting mode.
For MSAECU-18HRFN1-QRD0GW,
MSAEDU-24HRFN1-QRD0GW,
MSAEDU-24HRFNX-QRD0GW,
MSAEDU-24HRFN1-QRD0GW(B) models,
AC will enter the defrosting mode according to
the value of temperature of T3 and the value
range of temperature change of T3 and also the
compressor running time.
During the defrosting mode, the compressor
keep running, indoor and outdoor motor will stop,
defrost lamp of the indoor unit will be lighted
“ .”will be displayed.
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
℃
.
----T3 keeps to be higher than TCDE2
℃
for 80
seconds.
----The machine has run for 10 minutes in
defrosting mode.
9.4.3.5 Evaporator coil temperature
protection
T2
Resume
Off
Decrease
Hold
When evaporator temperature is more than the
setting protection value, the compressor will
stop.
9.4.4 Auto-mode
This mode can be chosen with remote
controller and the setting temperature can be
changed between 17°C~30°C
In auto mode, the machine will choose cooling,
heating or fan-only mode according to ΔT (ΔT
=T1-Ts).