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
℉
(℃)
Temp.
(23.89)
BAR
70
BAR
75
BAR
80
PSI
70
PSI
75
PSI
80
MPA
70
MPA
75
MPA
80
Pressure (bar)
Normal resistance value
∞
(Several MΩ)
COOLING MODE
Outdoor temp.
75
85
(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
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
126
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
Outdoor temp.
∞