qcfish
24-05-2014, 10:47 PM
This is my first time with a Daikin but the customer has complained for 6 months it does not cool. I like these Diakin VRV BTW. Techs have tried different repairs by clearing drains, adding *****, removing *****, etc.
The drain pump was not working so I pulled power from the pump and piped drain to gravity which stopped the A3 alarms. Next problem is the compressor will not ramp above 90HZ before it goes back down to 52 HZ even when it's very hot in the space because suction saturation drops below 43 degrees F. Adding ***** causes high pressure to fault. Pressures are 400/125 psi @82 HZ (410a)measured at the line set. I was pressed for time due to evening arrival, I did not have time to check splits inside and I forgot to check the pressure at the service port. Pressures were taken at the line set only. There's only one 3 ton air handler.
Liquid line temp is approx. 87F out of condenser, 87F after check valves to the receiver. Liquid line cools down to 61F after the Y2E sub cooling TXV and an 70F suction line temp.. I shut it down for 10 minutes and static was 260psi or 87F. It's 82F outside and 78F inside so it appears to be non condensable gasses based upon static and press/temps.
I don't know the history of past work beyond 6 months but they've had issues with HP failure alarms 6 months ago. These systems are complicated for most people. You need to go into setting mode 2 and scroll to energize valves to evacuate properly. Just connecting your gauges to the line set and evacuating won't work.
So aside from me not obtaining splits and discharge pressure.......am I missing anything? Thanks for your help.
The drain pump was not working so I pulled power from the pump and piped drain to gravity which stopped the A3 alarms. Next problem is the compressor will not ramp above 90HZ before it goes back down to 52 HZ even when it's very hot in the space because suction saturation drops below 43 degrees F. Adding ***** causes high pressure to fault. Pressures are 400/125 psi @82 HZ (410a)measured at the line set. I was pressed for time due to evening arrival, I did not have time to check splits inside and I forgot to check the pressure at the service port. Pressures were taken at the line set only. There's only one 3 ton air handler.
Liquid line temp is approx. 87F out of condenser, 87F after check valves to the receiver. Liquid line cools down to 61F after the Y2E sub cooling TXV and an 70F suction line temp.. I shut it down for 10 minutes and static was 260psi or 87F. It's 82F outside and 78F inside so it appears to be non condensable gasses based upon static and press/temps.
I don't know the history of past work beyond 6 months but they've had issues with HP failure alarms 6 months ago. These systems are complicated for most people. You need to go into setting mode 2 and scroll to energize valves to evacuate properly. Just connecting your gauges to the line set and evacuating won't work.
So aside from me not obtaining splits and discharge pressure.......am I missing anything? Thanks for your help.