Heating Mode - Midea MSX-18HRDN1-QC2 Service Manual

9.7 Heating mode

9.7.1 Indoor fan action:
1) Anti-cold-wind function.
2) If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127
seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is
available.
3) If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and
anti-cold-wind is disabled.
9.7.2 Indoor fan speed can be set as high, medium, low or auto grade, but anti-cold-wind function is preferential.
Auto fan action in heating mode.
9.7.3 After starting, the operation frequency of compressor submits to following rule:
When the machine runs, if ∆Th stays in a zone for 3 minutes, action of frequency is as follow:
Zone A: Elevate current frequency one grade, and not stop until the maximum grade.
Zone B: Elevate or keep or descend current frequency.
Zone H: Compressor stops after running with F1 for 60 minutes or when ∆Th＞6℃.
℃
44
38
37
34
33
24
17
℃
2.5
2.0
1.5
1.0
℃
5.0
4.5
1.0
0.5
Remark: ∆Tcon can be changed among 0, -2,- 4 , the default is 0
setting fan speed
low fan
breeze
super breeze
fan stop
low
medium
high
H
B
A
℃ ℃
23