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My Amtrol SF-20 is cycling wildly from 90 down to about 30. Water runs at low pressure then up for about 10-15 seconds then back down again for about 30 seconds. How do I clean/service the unit and replace air? The service tag says it is a 90psi unit.

Posted by stormyehitch on

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Gary Nigro

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I can't find that model number on the Amtrol site, please check it.
Is this a water storage tank? With an air charge?
If so:
Remove the dust cap on the charging valve on top, Schrader valve, like a car tire.
Use a small tool to slightly depress the pin in the middle.
If water comes out, the tank should be replaced but adding air will help for a while.
If air comes out, you can pressurize.
Determine the pump turn on and turn off pressures using a good pressure gauge.
Turn on may be 30 psi, turn off should be around 50 psi, TYPICALLY.
Switch the pump off.
Open a valve and drain all pressure from the water system.
Get a tire pump and pump up the tank pressure through the top valve to 2 psi lower than the pressure that the pump turned on above. If the pump turned on at 30 psi, pump up to 28 psi.
Put system back in service.
Gary

Posted on Feb 13, 2011

  • Gary Nigro
    Gary Nigro Feb 13, 2011

    I would like to add that there could be a pump problem, rather than a tank problem, but I don't know enough about your system.

    Gary

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http://www.amazon.com/dp/B000BQSERE/?tag=waterheaterti-20

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http://www.amazon.com/dp/B000BQYKJK/?tag=waterheaterti-20

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Hi, and no they are not related, but act like they are. If the outdoor unit starts, fan and all, we call this short cycling on its pressure switch. You have 2 pressure switch's, one for low pressure as its low on freon, or high pressure where its overheating and shutting off on its head pressure switch. Unplug it at the box near the unit. Take a garden hose and wash your coil out real good, but not to flatten the aluminum fins on the coil. You can also use a solution of detergent and water to spray the coil down before washing if you can, but you don't have to to find out if it is the high pressure switch. If it continues to short cycle, then you have developed a small leak and lost enough freon to cause this problem. You will need to have it charged and leak checked if they determine how large of a leak it is. I am pretty sure from the amount of time it starts and stops, its low on gas. When the unit starts, the compressor will start to pump causing it to go into a vac on the low side gauge. When running on a full charge, it will be on about 64 p.s.i. at 95 degrees outdoors. If is low on gas/freon, it will pull down to around 20 p.s.i. which is the factory set point for the low pressure switch to kick off. The gauge will then start to rise and in seconds start up and repeat this again. This is what yours is doing now. Try washing the coil first, and turn it on. If it continues to short cycle, you will have to get it charged. If its 10 or more years old, it will take the R-22 freon. If newer, it may be the 410-A. Either way you cant buy it. I hope I have been of help to you. Please let me know.
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