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Thread: Oil return in VRF systems
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22-05-2010, 06:16 PM #1
Oil return in VRF systems
Are there special piping requirements for VFR systems to ensure oil return? (I'm thinking of upgrading my split system to VRF). I read somewhere that IQDrive ramps the compressor up to full speed for 4 mins every half hour to ensure proper oil return. How do other systems handle it?
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22-05-2010, 06:18 PM #2
Re: Oil return in VRF systems
A little more info - in my case the compressor/condenser are roof mounted, the air handler is about 20ft below.
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22-05-2010, 07:21 PM #3
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23-05-2010, 01:34 AM #4
Re: Oil return in VRF systems
I'm thinking about modifying my current system by adding an inverter drive and an EEV - so I'm trying to learn all I can about what the issues are. At lower loads the refrigerant flow will be lower, so I'm concerned about oil return.
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23-05-2010, 05:07 AM #5
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16-06-2010, 09:08 PM #6
Re: Oil return in VRF systems
You really can't make a true VRF system without having all the software, hardware, and components in sync.
Regarding the oil return, Daikin losses more oil into the system than Mitsubishi.
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16-07-2010, 10:14 AM #7
Re: Oil return in VRF systems
I think you should not modify your system to VRF system.. It will cost very high..
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