Evaporator Coil Temperature Protection; Auto-Mode; Timer Function - Midea MCA3U-09HRFN1-M(C) Service Manual

16.4.3.5 Evaporator
protection
TEstop
TEdown
TEH2
Off: Compressor stops.
Decrease: Decrease the running frequency to
the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.

16.4.4 Auto-mode

This mode can be chosen with remote
controller and the setting temperature can be
changed between 17~30℃(63~86°F).
In auto mode, the machine will choose cooling,
heating or fan-only mode according to ΔT (ΔT
=T1-Ts).
ΔT=T1-Ts
ΔT>2℃(3.6° F )
-2℃(-3.6° F ) ≤ΔT≤2℃
(3.6° F )
ΔT<-2℃(-3.6° F )
Indoor fan will run at auto fan of the relevant
mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating
and cooling, the compressor will keep stopping
for 15 minutes and then choose mode
according to T1-Ts.
If the setting temperature is modified, the
machine will choose running function again.
For MCD1-24HRFN1-MT0W(GA),
In auto mode, the machine selects cooling,
heating or fan-only mode on the basis of T1,Ts
and T4.
coil temperature
Off
Decrease
Hold
Resume
Running mode
Cooling
Fan-only
Heating
T1
Cooling
Ts+3
Fan
Ts+2
Ts+1
Ts-3
Heating
13
16.4.5 Drying mode
Drying mode works the same as cooling mode
in breeze speed.
All protections are active and the same as that
in cooling mode.
For MCD1-24HRFN1-MT0W(GA),
In drying mode, AC operates the same as auto
fan in cooling mode.
All protections are activated and operate the
same as they do that in cooling mode.
Low Room Temperature Protection
If the room temperature is lower than 10°C, the
compressor ceases operations and does not
resume until room temperature exceeds 12°C.

16.4.6 Timer function

16.4.6.1 Timing range is 24 hours.
16.4.6.2 Timer on. The machine will turn on
automatically when reaching the setting time.
16.4.6.3 Timer off. The machine will turn off
automatically when reaching the setting time.
16.4.6.4 Timer on/off. The machine will turn on
automatically when reaching the setting "on"
time, and then turn off automatically when
reaching the setting "off" time.
16.4.6.5 Timer off/on. The machine will turn off
automatically when reaching the setting "off"
time, and then turn on automatically when
reaching the setting "on" time.
16.4.6.6 The timer function will not change the
AC current operation mode. Suppose AC is off
now, it will not start up firstly after setting the
"timer off" function. And when reaching the
setting time, the timer LED will be off and the
AC running mode has not been changed.
186
Cooling
Cooling
Fan
Cooling
Fan
Heating
18 28
T4