Texaskelly
31-03-2010, 10:22 PM
I have taken over a large daikin VRV heat recovery install....its a bad install to be sure, but I have a theory I would like to throw at you Daikin guys. I have had several compressors fail, both inverter and standard. None have been burnouts, most were simply over amping or locked down from bearing damage.
These are fairly long lines going down up to 5 stories then down the hall to up to 13 apartments. I have noticed that the tennants seem to be turning off the indoor units, when I hook up my checker I may only have one unit on out of 13, and sometimes Ill walk up to a group of 9 outdoor units and none of them are running. So my question is this; could the lack of runtime be not allowing proper oil return? I know the return cycle is a timer, and I wonde if its not sufficient in this case due to a lot of off time.
These are fairly long lines going down up to 5 stories then down the hall to up to 13 apartments. I have noticed that the tennants seem to be turning off the indoor units, when I hook up my checker I may only have one unit on out of 13, and sometimes Ill walk up to a group of 9 outdoor units and none of them are running. So my question is this; could the lack of runtime be not allowing proper oil return? I know the return cycle is a timer, and I wonde if its not sufficient in this case due to a lot of off time.