Results 1 to 14 of 14
Thread: Wrong pipes diameter - what now?
-
30-07-2010, 09:14 PM #1
Wrong pipes diameter - what now?
Hello!
My customer have new house with installations for multi split system. Installed pipes diameter are 1/2" and 3/8".
I want install Mitsubishi sistem with outdoor unit MXZ-2A52VA and indoor units 2xMSZ-FD35VA.
Pipes diameter for this system is 1/4" and 3/8".
Can i reduce diameter on both sides of pipe with welding some pipe with right diameter?
Pipes are approximate 25m long.
Will system work? I calculate that i must add approximate 200g extra gas. Is this ok?
Thank you!
Igor
-
30-07-2010, 10:41 PM #2
Re: Wrong pipes diameter - what now?
Can you push some 1/4" tube inside the 1/2", that way you will have the right sizes.
Brian - Newton Abbot, Devon, UK
Retired March 2015
-
31-07-2010, 12:45 AM #3
-
31-07-2010, 01:34 AM #4
Re: Wrong pipes diameter - what now?
What's the problem with pipes? Let see: You have 3/8" instead of 1/4" for liquid line » Good/BETTER (less pressure loss, less flash gas at TXV); you have 1/2" instead of 3/8" for suction line so less suction pressure loss. The only problem I see is the lack of oil return. However I think it should have no problem because I bet the vapor velocity will be still sufficient. If the condensing unit is below the evaporators levels no problem will have.
To make progress is never good enough, I want to do better and better and better
-
31-07-2010, 06:47 AM #5
-
31-07-2010, 11:18 AM #6
-
31-07-2010, 02:09 PM #7
Re: Wrong pipes diameter - what now?
Just let it work, With 25 m lengths, it will be fine.
This Ac we are talking about, not science.
-
01-08-2010, 05:55 AM #8
Re: Wrong pipes diameter - what now?
no problem just add extra charge
-
03-08-2010, 12:55 AM #9
Re: Wrong pipes diameter - what now?
Main problem arises with the 3/8 replacing the 1/4 the valve/flow control is most likely in the outdoor unit (check this) this will lead to the refrigerant flashing/expanding too early before the evaporator. Compensating by more gas on these lengths would lead to more refrigerant in the system than that which it was designed for. Be aware of other consecuential effects when used as a heat pump.
-
03-08-2010, 06:21 AM #10
Re: Wrong pipes diameter - what now?
This is my greatest fear...
[quote=momo;197699]Compensating by more gas on these lengths would lead to more refrigerant in the system than that which it was designed for. quote]
I will add only 200-300g of refrigerant. This shoud not be a problem!
[quote=momo;197699]Be aware of other consecuential effects when used as a heat pump. quote]
?
Tomorrow i will see what will hapend...
Thank you
-
03-08-2010, 10:24 AM #11
Re: Wrong pipes diameter - what now?
To make progress is never good enough, I want to do better and better and better
-
05-08-2010, 02:33 PM #12
Re: Wrong pipes diameter - what now?
Hi Igi,
How is the AC working? Have it started up?To make progress is never good enough, I want to do better and better and better
-
05-08-2010, 09:05 PM #13
-
06-08-2010, 12:15 AM #14
Re: Wrong pipes diameter - what now?
Great to hear that.
Keep in touch igiTo make progress is never good enough, I want to do better and better and better
Similar Threads
-
Fujitsu split pipes
By gazza666 in forum Air ConditioningReplies: 10Last Post: 15-07-2010, 08:59 AM -
Only first half of Pipes freezing?
By Bobbin in forum CommercialReplies: 6Last Post: 09-04-2010, 08:45 PM -
Alternative Pipe Diameter Calculation (?)
By ice_cold in forum FundamentalsReplies: 7Last Post: 03-01-2010, 10:33 AM -
Running pipes in concrete
By Jadeair in forum Supermarket RefrigerationReplies: 9Last Post: 10-11-2008, 09:24 AM -
Installing pipes
By tuneee in forum FundamentalsReplies: 8Last Post: 05-06-2007, 08:21 PM