phase3
10-07-2006, 11:03 PM
First off.......... New to the forum, so hello to you all :)
Working on a Fujitsu ceiling cassette (R410a) today. Initially brought up a fault code of which was traced to an lp issue. Low and behold the system hadn't a drop of gas left. Pressure test revealed a small crack to the flared service valve tapped off beneath the 3 way valve. Brazed this. Pressure tested (all fine), then vac'd out, recharge accordingly.
The base charge was 2400kg (anyone know the maximum pipe run before additional charge??) Suction registered less than 60 psi?!?!?! whilst the liquid completely frosted over on the service port and looked set to freeze further back up the pipe run on the high side....had pulled back lagging to reveal this.
Thing is.Compressor running, but condenser doing little duty as no heat exchange apparant with the fan blowing in my face it was ambient cool-no warmth whatsoever.
Suspect internal compressor damage, wondered if it could be a pumping issue??? I checked to see that both valves were back seated and they were. Realise I could do a pump down test on this but wondered if anyones encountered something similar that could save me the time and just write this pot off altogether???
It was like the compressor had only enough clout to pump to the beggining of the liquid line and go no further. No suction??
Hope it's not a blockage.
Any thoughts appreciated.:rolleyes:
Cheers,
Jon.
Working on a Fujitsu ceiling cassette (R410a) today. Initially brought up a fault code of which was traced to an lp issue. Low and behold the system hadn't a drop of gas left. Pressure test revealed a small crack to the flared service valve tapped off beneath the 3 way valve. Brazed this. Pressure tested (all fine), then vac'd out, recharge accordingly.
The base charge was 2400kg (anyone know the maximum pipe run before additional charge??) Suction registered less than 60 psi?!?!?! whilst the liquid completely frosted over on the service port and looked set to freeze further back up the pipe run on the high side....had pulled back lagging to reveal this.
Thing is.Compressor running, but condenser doing little duty as no heat exchange apparant with the fan blowing in my face it was ambient cool-no warmth whatsoever.
Suspect internal compressor damage, wondered if it could be a pumping issue??? I checked to see that both valves were back seated and they were. Realise I could do a pump down test on this but wondered if anyones encountered something similar that could save me the time and just write this pot off altogether???
It was like the compressor had only enough clout to pump to the beggining of the liquid line and go no further. No suction??
Hope it's not a blockage.
Any thoughts appreciated.:rolleyes:
Cheers,
Jon.