Panasonic WU-216MF2U9 - Service Manual - Page 183

Inspection and Characteristics of Parts, Disconnect the CN4 connector 3P

Get Panasonic WU-216MF2U9 PDF manuals and user guides View all Panasonic WU-216MF2U9 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 183 highlights

5. Inspection and Characteristics of Parts 3WAY VRF SYSTEM Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2) U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9 63PH1 Disconnect the CN3 connector (3P, white) from the Outdoor Unit Control PCB. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. 63PH2 Disconnect the CN89 connector (2P, red) from the Outdoor Unit Control PCB. Measure the resistance between socket pins 1 and 2. The resistance is OK if the result is 0 Ω. U-72MF2U94 / U-96MF2U94 / U-120MF2U94 / U-144MF2U94 63PH1 Disconnect the CN4 connector (3P, white) from the Outdoor Unit Relay PCB. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. 1 63PH2 Disconnect the CN5 connector (3P, red) from the Outdoor Unit Relay PCB. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. (2) Electronic Control Valve (MOV1, MOV2, MOV4) After removing the connector from the PCB, use the following methods to check the valves. 2 MOV1 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN64 connector (5P, white) on the Outdoor Unit Control PCB. (Because of the pulse output, a simplified measurement method is used. Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is 3 normal.) When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve connector. The connector is normal if all results (pin 5 - pin 1, pin 5 - pin 2, pin 5 - pin 3, pin 5 - pin 4) are approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.) 4 MOV2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN63 connector (5P, red) on the Outdoor Unit Control PCB. (Because of the pulse output, a simplified measurement method is used. Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is normal.) 5 When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve connector. The connector is normal if all results (pin 5 - pin 1, pin 5 - pin 2, pin 5 - pin 3, pin 5 - pin 4) MOV4 are approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.) Measure the voltage between plug pin 5 and pins 1 through 4 at the CN57 connector (5P, blue) on 6 the Outdoor Unit Control PCB. (Because of the pulse output, a simplified measurement method is used. Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is normal.) 7 When the voltage is normal, measure the resistance between each pair of pins on the electronic control valve connector. The connector is normal if all results (pin 5 - pin 1, pin 5 - pin 2, pin 5 - pin 3, pin 5 - pin 4) are approximately 46Ω. (If the results are 0Ω or ∞, replace the coil.) 8 (3) Crankcase Heater • Check the resistance of crankcase heater using a tester. Under the value under the temperature 68°F, the result shows 1763Ω ± 7%. 5 - 31 9

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
5
- 31
5
5. Inspection and Characteristics of Parts
3WAY VRF SYSTEM
Trouble Diagnosis
5
- 31
(1) High-Pressure Switch (63PH1, 63PH2)
U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9
63PH1
Disconnect the CN3 connector (3P, white) from the Outdoor Unit Control PCB.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0
Ω
.
63PH2
Disconnect the CN89 connector (2P, red) from the Outdoor Unit Control PCB.
Measure the resistance between socket pins 1 and 2.
The resistance is OK if the result is 0
Ω
.
U-72MF2U94 / U-96MF2U94 / U-120MF2U94 / U-144MF2U94
63PH1
Disconnect the CN4 connector (3P, white) from the Outdoor Unit Relay PCB.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0
Ω
.
63PH2
Disconnect the CN5 connector (3P, red) from the Outdoor Unit Relay PCB.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0
Ω
.
(2) Electronic Control Valve (MOV1, MOV2, MOV4)
After removing the connector from the PCB, use the following methods to check the valves.
MOV1
Measure the voltage between plug pin 5 and pins 1 through 4 at the CN64 connector (5P, white)
on the Outdoor Unit Control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is
normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4) are
approximately 46
Ω
. (If the results are 0
Ω
or
∞
, replace the coil.)
MOV2
Measure the voltage between plug pin 5 and pins 1 through 4 at the CN63 connector (5P, red) on
the Outdoor Unit Control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is
normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46
Ω
. (If the results are 0
Ω
or
∞
, replace the coil.)
MOV4
Measure the voltage between plug pin 5 and pins 1 through 4 at the CN57 connector (5P, blue) on
the Outdoor Unit Control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage is
normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46
Ω
. (If the results are 0
Ω
or
∞
, replace the coil.)
(3) Crankcase Heater
• Check the resistance of crankcase heater using a tester.
Under the value under the temperature 68
°
F, the result shows 1763
Ω
± 7%.