Outdoor Fan Control - Mitsubishi Electric MS-A WA Service Technical Manual

3-6. OUTDOOR FAN CONTROL

Fan speed is switched according to the number of operating indoor unit and the compressor frequency.
MXZ-2B20NA
<Relation between compressor frequency and fan speed>
MXZ-2B20NA
NOTE: When the indoor coil thermistor is 134.6 ˚F (57°C) or more on HEAT operation, fan speed is fixed to Low speed.
Or, the indoor coil thermistor is 113 ˚F (45°C) or less on HEAT operation, fan speed is back to normal.
MXZ-2B20NA- MXZ-3B MXZ-4B
1
COOL
Fan speed changes so that the condensing temperature stays within the target range.
Fan speed
MXZ-2B20NA-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
HEAT
Fan speed is switched according to the compressor frequency.
Fan speed
MXZ-2B20NA-
Up
Down
Compressor frequency (Hz)
Down Up
30 40
Revolution per minutes (rpm)
MXZ-3B
1
MXZ-4B
100 100
150 150
200 200
250 250
300 300
350 350
400 400
450 450
500 500
550 550
600 600
650 650
700 700
750 750
Compressor speed (Hz)
MXZ-3B
1
MXZ-4B
30 50
23 40
Fan speed
Down
High
Low
Min. Compressor frequency
Frequency (Hz) Target condensing temperature (°F/°C)
~24
25~34
35~44
45~54
55~64
65~
Fan speed
Down
High
Low
Min. Compressor frequency
32
Up
Max.
87.8/31-95.0/35
91.4/33-98.6/37
95.0/35-102.2/39
98.6/37-105.8/41
98.6/37-105.8/41
98.6/37-105.8/41
Up
Max.