Auto Mode Function; Forced Operation Function; Action Of 4-Way Valve; Two Speeds Outdoor Fan Function - Midea MSR1-24HRDN1-QC2W Service Manual

8.8 Auto mode function

8.8.1 This mode can be chosen with remote controller and the setting temperature can be changed between 17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to ∆T(∆T =T1-Ts).
8.8.2 Indoor fan will choose auto speed of relevant mode.
8.8.3 If the machine switches mode between heating and cooling, compressor will keep stopping for 15 minutes and
then rechoose mode according to ∆T.
8.8.4 If the setting temperature is modified, the machine will rechoose running function.

8.9 Forced operation function

8.9.1 Forced cooling and auto function can carry out with a touch button. In these two modes, the machine can be
changed by remote controller to any other mode at any moment.
8.9.2 When the machine is off, pressing the touch button once, the unit will enter forced auto mode. When the
machine is off, pressing the touch button twice within 5s, the unit will enter forced cooling mode. When the unit is
running at forced auto or forced cooling mode, pressing the touch button continuously, the unit will be turned off.
8.9.3 In forced operation mode, all general protections is available.
8.9.4 In forced cooling mode, the unit will run with fixed frequency F2 at low speed. 30 minutes later, the unit will turn
to normal auto mode with setting temperature 24℃.
8.9.5 In forced auto mode, the unit will run with setting temperature 24℃.

8.10 Action of 4-way valve

In cooling, drying, fan-only, or turning off mode, 4-way valve is off, while in heating mode 4-way valve is on. If the
unit changes operation mode, 4-way valve will be delayed off 2 minutes after compressor stop. For defrosting,
please refer to the passage "defrosting mode".

8.11 Two speeds outdoor fan function

8.11.1 Outdoor fan starts at the same time with compressor, but stops 30 seconds later after compressor stop.
8.11.2 Outdoor fan action in heating mode(including heating in auto mode).
℃
17
15
Outdoor fan action in heating mode
(including heating in auto mode).
8.11.3 Outdoor fan action in cooling & drying mode(including cooling in auto & forced mode).
Please refer to the pic. above.
∆T=T1-Ts
∆T＞1℃
-1≤∆T≤1℃
∆T＜-1℃
low
high
Running mode
Cooling
Fan-only
Heating
℃
22
20
Outdoor fan action in cooling & drying mode
(including cooling in auto & forced mode).
high
low
25