Midea MUBU-12HRFN1-M Service Manual page 86

3. IPM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital
tester to measure the resistance between P and UVWN; UVW and N.
Digital tester
(+)Red (-)Black
N
U
P
V
W
4: Pressure on Service Port
Cooling chart:
℉
Indoor
(℃) Temperature
BAR 70
BAR 75
BAR 80
PSI 70
PSI 75
PSI 80
MPA 70
MPA 75
MPA 80
Pressure (bar)
12.0
10.0
8.0
6.0
4.0
2.0
0.0
75 （23.89） 85 （29.44）
Normal resistance value
∞
(Several MΩ)
COOLING MODE
Outdoor temperature
75 85
（23.89） （29.44）
8.2 7.8
8.6 8.3
9.3 8.9
119 113
124 120
135 129
0.82 0.78
0.86 0.83
0.93 0.89
95
（35）
Digital tester
(+)Red
U
V
W
(+)Red
95 105
（35） （40.56）
8.1 8.6
8.7 9.1
9.1 9.6
117 125
126 132
132 140
0.81 0.86
0.87 0.91
0.91 0.96
105 115
（40.56） （46.11）
83
Normal resistance value
(-)Black
N
(Several MΩ)
115
（46.11）
10.1
10.7
11.2
147
155
162
1.01
1.07
1.12
70
75
80
Outdoor temperature
∞