troymedhurst
22-02-2014, 05:22 PM
Good Evening All
Been having some problems with a RSXY10K7W1
Main Issue is fan control and dropping discharge and suction pressures.
After monitoring system, I noticed that MF1 high speed relay was not working, so MF2 was cutting in, but then dropping head pressure to 7.8 bar before cutting out. This was causing a suction pressure drop, which was then backing off internal units. I also noticed that voltage on HP transducer was reading 2 bar higher than it actually was.
I changed A1P board and HP transducer and ensured that ambient sensor was correct.
Now when system starts fans both start etc... then MF1 is on Low when pressure reaches about 16 bar MF1 High then comes on, which is fine, but it is not cutting out when it should ! according to Daikin they say MF1 High should cut out at 15.7 bar, but it doesn't and the pressure sits about 13 bar with the inverter not really ramping up fully, even though there is plenty of load.
Now I have read in the manual about Low ambient Cooling, but the manual doesn't make sense! even to the point that daikin Tech didn't understand it either. It almost seems like the control logic is back to front and it tries to keep head pessure low? I was supposed to get a call back from their VRV specialist, but no joy yet. ( probably busy).
Notes:
Gas charge is correct.
Daikin state that MF2 should'nt cut in until 21.6 bar actually cutting in at around 19 bar and should cut out at 16.1 bar, does'nt cut out until around 7.8 bar
If anyone has any ideas? or could read the manual about Low ambient cooling and can make sense of it?
I would be most grateful for any input.:o
Been having some problems with a RSXY10K7W1
Main Issue is fan control and dropping discharge and suction pressures.
After monitoring system, I noticed that MF1 high speed relay was not working, so MF2 was cutting in, but then dropping head pressure to 7.8 bar before cutting out. This was causing a suction pressure drop, which was then backing off internal units. I also noticed that voltage on HP transducer was reading 2 bar higher than it actually was.
I changed A1P board and HP transducer and ensured that ambient sensor was correct.
Now when system starts fans both start etc... then MF1 is on Low when pressure reaches about 16 bar MF1 High then comes on, which is fine, but it is not cutting out when it should ! according to Daikin they say MF1 High should cut out at 15.7 bar, but it doesn't and the pressure sits about 13 bar with the inverter not really ramping up fully, even though there is plenty of load.
Now I have read in the manual about Low ambient Cooling, but the manual doesn't make sense! even to the point that daikin Tech didn't understand it either. It almost seems like the control logic is back to front and it tries to keep head pessure low? I was supposed to get a call back from their VRV specialist, but no joy yet. ( probably busy).
Notes:
Gas charge is correct.
Daikin state that MF2 should'nt cut in until 21.6 bar actually cutting in at around 19 bar and should cut out at 16.1 bar, does'nt cut out until around 7.8 bar
If anyone has any ideas? or could read the manual about Low ambient cooling and can make sense of it?
I would be most grateful for any input.:o