Carrier RTU model# 48TFE012, serial# 4803G20688.
From what I gather from the owner, one fuse in the dissconnect is blowing towards the late afternoon. I know from previous PM's that this unit has been running high head pressure, especially second stage. Other Techs have been there and replaced the fuse. The owner was told by one Tech to direct a lawn sprinkler at the condenser. He stated to me that he did and the fuse problem went away. We have also known from PM's that the blower motor had bearing going bad. He had us replace the motor thinking that was the cause of the fuse blowing. I'm not sure if we sold him on that one or if the owner thought that that might help. Well after we replaced the blower motor, he says he did away with the sprinkler and the fuse started blowing again. Now i got called to the job. I'm at least the third Tech involved so I what to get this corrected.
I'm suspecting that the second stage circuit is over charged and causing the compressor to run at high amps therefore blowing the fuse. Does this sound possible, or should I have a few more beers and rethink this thing.
Here are some numbers that I gathered on Friday.
58 line temp
82 line temp
compressor#1 rated amps 15.8
actual amps 14.7
48 line temp
95 line temp
compressor#2 rated amps 15.8
actual amps 16.6