Sanyo SPW-C256VH Technical Data & Service Manual page 455

SPW-C486VH for single-phase and C256 / 366 / 486 / 606VH8 for 3-phase
Alarm Details
(1-2) [Alarm "P29"]
Start of defect diagnosis
Is the power voltage correct?
Yes
Are the wiring connector
connections OK?
Yes
Are the U/V/W
connections on the HIC
PCB and compressor
terminal OK?
Yes
Is the detected
values of CT current
(current values) during
compressor operation
normal?
Yes (No problem
with the CT
detected value)
Are the resistance
values permissible at all
areas in HIC PCB?
Yes
(No problem with the resistance value)
Is the insulation on the
compression OK?
Yes
(No problem with the insulation)
Is electronic
expansion valve operation
normal?
Yes
Replace the outdoor unit control PCB and HIC PCB.
Start-up failure of the compressor (will not start up)
Related parts
• HIC PCB (CR-HIC160B-E, HIC-CR364GVH8, HIC-CR604GVH8)
• Outdoor unit control PCB (CR-C486VH, CR256VH8, CR606VH8)
No
Improve the power voltage line.
Check the following:
Check to ascertain that the power voltage is within the permissible range of 198 to 264V
for indoor and outdoor units regardless of whether the compressor is operating or not.
Regarding 3-phase outdoor unit, the power voltage is 342 to 456 V.
* Pay special attention to whether the voltage drops after compressor operations while measuring.
No
Repair the wiring connectors.
Check the following wiring:
Display on PCB HIC PCB side
HIC+ CN04
HIC- CN05
HIC1 CN01
HIC2 CN02
RE1 (Reactor)
RE2 (Reactor)
DC+ (Bridge Diode)
DC- (Bridge Diode)
No
Repair the wiring connectors.
HIC PCB side
U (CN06) pink
V (CN07) white
W (CN08) blue
No (The CT detected value is abnormal.)
Replace the outdoor unit control PCB.
When the CT detected value is abnormal, the alarm occurs and the compressor stops
after 1-minute operation.
Verify the CT current values by performing the following steps.
Confi rm that the difference between CT current detected values (*) and the current value
(measured by clamp meter) of power source wiring (between outdoor unit power terminal
and control PCB; red, white, blue) is within 1A.
* Verifi cation method of CT current detect
1. With the outdoor unit maintenance remote controller
Check with the code "14" of the temperature sensor display function.
2. With the indoor unit remote controller
Check with the sensor address "14" of the temperature sensor display function.
No (Abnormal resistance value)
Replace the HIC PCB.
• Verifi cation method: Remove the HIC PCB and measure the resistance at all areas.
Refer to the page 5 - 12.
Replace the HIC PCB if the readings are below permissible values.
No (Defective insulation)
Replace the compressor. • Potential cause:
No
Is C1, TS sensor normal?
Yes
Replace electronic expansion valve.
5-9
Outdoor unit
control PCB side
CN069 (wire : yellow)
CN070 (wire : gray)
CN207 (10P white)
CN206 (8P white)
- CN066 (wire : white)
- CN067 (wire : white)
- CN062 (wire : red)
- CN063 (wire : blue)
Insulation failure caused by the compressor lock.
• Verification Method
Remove the wires from the connectors on the top of the compressor.
Measure the insulation resistance of the U, V and W phases and
confirm that they are 1M Ω or more.
No
Replace C1, TS sensor.
5