pie man
26-04-2011, 10:18 PM
Hi fellow engineers,
I was hoping someone might be able to help me on a problem I have been given at my works office.
The problem: unit will not cool or heat. A few weeks ago was asked to replace the indoor board for this unit - was only installed 8 months ago :eek:. The guy who installed it said it was blowing the boards fuse. Anyway this did not solve the problem, I suspect this unit has not worked since day one.
Model details are: Fujitsu split R410a Inverter outdooor AOYR24LCL S/N: E001601.
So get the call to look at it again. Attached gauges to lp (no hp fitting at ball valves). The standing pressure was at 12 bar. Ran in cool and heat mode on test run, the unit didn't fault out (red and green leds both on and off at the same time on the indoor). Noticed the outdoor condensor fan would run for several seconds and cut out, but nothing from the compressor. I have checked supply on the IPM PWB red/white/black wire connections to compressor, all tested approx. 140v to earth, therefore supply to compressor. Also did an insulation test to each compressor winding, all tested fine and nowt down to earth.
Then contacted Fujitsu technical, not sure what I did wrong but I was asked to test the voltage for a brown wire on this IPM PWB which connects to a FILTER PWB to earth...this caused a spark and a bang....this board ended up burnt out :confused:.
I hope this is enough information and would appriciate any suggestions you guys/or gals might have!
Pie Man :)
I was hoping someone might be able to help me on a problem I have been given at my works office.
The problem: unit will not cool or heat. A few weeks ago was asked to replace the indoor board for this unit - was only installed 8 months ago :eek:. The guy who installed it said it was blowing the boards fuse. Anyway this did not solve the problem, I suspect this unit has not worked since day one.
Model details are: Fujitsu split R410a Inverter outdooor AOYR24LCL S/N: E001601.
So get the call to look at it again. Attached gauges to lp (no hp fitting at ball valves). The standing pressure was at 12 bar. Ran in cool and heat mode on test run, the unit didn't fault out (red and green leds both on and off at the same time on the indoor). Noticed the outdoor condensor fan would run for several seconds and cut out, but nothing from the compressor. I have checked supply on the IPM PWB red/white/black wire connections to compressor, all tested approx. 140v to earth, therefore supply to compressor. Also did an insulation test to each compressor winding, all tested fine and nowt down to earth.
Then contacted Fujitsu technical, not sure what I did wrong but I was asked to test the voltage for a brown wire on this IPM PWB which connects to a FILTER PWB to earth...this caused a spark and a bang....this board ended up burnt out :confused:.
I hope this is enough information and would appriciate any suggestions you guys/or gals might have!
Pie Man :)