Question about Fujitsu 24C1 Air Conditioner

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Lingth of line

What is ment by maximum hight difference? I have a total of 70' of run with a 25' lift. (model ASU24CL). How does affect your over maximum pipe length?

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The length of line set can dramatically effect the efficiency and operation of the air conditioner. There is a science behind the design and application of the different sizes. Refrigerant carries oil in it as well as the refrigerant itself. The length can change the amount of oil that is supplied to the compressor. The length of pipe can change the indoor coil's ability to flash to vapor gases.

The instructions that came with your unit should be able to simplify this for you. There will be minimum and Maximum lengths and possibly even some graphs and tables to study.

Posted on Jun 30, 2008


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Posted on Jan 02, 2017


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Fujitsu unit outdoor model AO54UJBMR central controller flashing EO 25. PFC over current. Carried out a power reset. running current is 20.2 A unit is drawing 20.2A. How do I diagnose this fault?

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Pump will not pump water, its runs

Hi and welcome to FixYa. I am Kelly.

If this is a new system installation there can be a few reasons for the pump not pumping water.
1. The most porbable cause is that it is sucking air on the suction line. Check to make sure each and every connection it a good sealed connection.
2. The pump having never had water in it may have to be primed by introducing water into the outlet hole or remove the impeller housing plug and prefill the cavity with water.
3. There should be a check valve or a foot valve with screen at the very end of the suction tube.$department/deptdocs.nsf/all/agdex1143
Jet pumps lose efficiency as the total lift increases. Total lift includes the vertical distance from the water to the pump plus the friction losses in the suction line and foot valve. Shallow well jets are not practical if the total lift exceeds 5.5 m (18 ft).

Pumping water containing sand will cause wear and leakage around mechanical seals. The mechanical seal on the pump shaft is water lubricated and water cooled, so the pump should never be run without the pump casing being filled with water. Air or gases in the pump will cause a loss of prime. Shallow well jet pumps must have either a check valve or foot valve installed on the suction line to maintain prime.

Foot Valve:

Check Valve:

You can use both if necessary but usually only one is required. The in-line check valve can be closer to the pump.

I will post troubleshooting if the site will accept the steps next post. Currently it says I have exceeded maximum length.

Thanks for choosing FixYa.


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Pipe size is okay, not that I know any better than the manufacturer, but I would recommend at least two and possibly even three oil traps in the vapor line on the way back up.

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