Results 1 to 9 of 9
Thread: Daikin star wired
-
21-01-2010, 06:20 PM #1
Daikin star wired
Could a star wired vrv heat recovery cause transmission faults after 3yrs of being trouble free?
-
21-01-2010, 08:25 PM #2
Re: Daikin star wired
Star or Y wired is about the motor only, regardless to the work it is doing.
Its easier on the motor start torque and pulls less amps then Delta or Δ.
And To your question, nope.
-
21-01-2010, 08:39 PM #3
-
21-01-2010, 08:47 PM #4
Re: Daikin star wired
Strange enough, I would say yes.
I had a 'K' series operating for years which was hooked up to a DBACS. This VRV was added at a later date and the F1/F2 loop was star wired into the DBACS panel as opposed to connecting up to the rest of the daisy chain.
Did get the odd fault appearing but it always reset. In the end I just rewired.
Jase
-
21-01-2010, 09:21 PM #5
Re: Daikin star wired
Exactly what I mean, I have a vrv ii heat recovery system thats been working fine but now keeps going into U9, the wiring is appauling and I'm going to trace it tommorow. If 1 fan coil was isolated by the customer would it create a transmission fault?
Only just taken over maintenance of this system but client states it's never happened before
-
21-01-2010, 09:34 PM #6
Re: Daikin star wired
Chemi
This is related to the wiring of the VRV indoor units for the comms wiring. It is supposed to be daisy chained from one to the next to the last. Occasionally for whatever they wire to a central point and 'star' out like spokes on a wheel to each indoor unit.
although Nike has an interesting comment
http://www.refrigeration-engineer.co...ead.php?t=3966
page 174 as nike suggests
http://www.daikinac.com/commercial/d...SiUS39-504.pdf
-
21-01-2010, 10:06 PM #7
Re: Daikin star wired
Hi Guys,
In my opinion a U9 fault is generally a transmission error, where one unit has powered down or turned off for some reason. All of the remotes will show U9, which is basically telling you that another unit on the system is in fault.
As to the way the wiring is run, I too was told that it works on resistence of the cable, but then I spoke to daikin technical and was told that it works on what order the indoor pcbs, simply, reply.
Normally any centralised contoller has to be connected to the outdoor, But I know that, on a two pipe system, you can star off of any indoor unit. But if that unit powers down for any reason a fault will occur.
Also I read on the link that was pasted on this tread, that when an addition is added to a vrv or replacement pcb, it will all need re addressing, this is not totally true. If the system has higher form of control i.e centralised controller. The units will not lose their address , you would only have to give any new unit a spare address and re-set system. It does not autmatically re-address. A system will only automatically re address if no higher control is connected to the system.
All of this infomation, I belive to be correct, as from daikin technical
Hopes this helps Troy
-
22-01-2010, 05:11 PM #8
-
22-01-2010, 06:23 PM #9
Re: Daikin star wired
Thanks Rich,
I know I did a good thing when I've stopped touching those air conditioners years ago.
I was referring to regular electric motors with or without frequency controller.
Similar Threads
-
Daikin not working... many problems
By stankovicv in forum Air ConditioningReplies: 26Last Post: 11-12-2010, 09:01 AM -
Transmission wiring on Daikin VRV2
By Markie in forum Air ConditioningReplies: 19Last Post: 25-09-2009, 06:24 PM -
Daikin AC parts from UK
By skel00 in forum Air ConditioningReplies: 5Last Post: 05-04-2009, 01:24 PM -
Fixing Daikin A3 Error
By Stuffy in forum Air ConditioningReplies: 3Last Post: 27-03-2009, 06:02 AM -
Daikin Hard wired controller
By marc5180 in forum Air ConditioningReplies: 16Last Post: 10-11-2007, 06:43 PM