Have had a new Grundfos SQE pump installed. The existing pressure
tank is still in use. It is 60 gallons. CU301 is set to 60.
Installer said he calibrated the tank. Anyone know what that meant?
Don't recall him changing the pressure in the tank.
Looking for info as I'd like to use the lower PSI settings to save
electricity when the power is out and I am powering it with a
Withith pressure tanks they would be set at about 5 psi lower than
the pump kicks on at.You might try tinkering around with a tire guage
and air compressor on sunday or something.Maybe like 7-10 psi lower in
the tank and see how the water pressure is then.The whole idea is that
you push water in the tank and compress the air so that your pump
doesn't have to work so hard.
It compresses the air in the tank and allows enough pressure to help
water in the house when its not in serious demand.Air will disolve in
water so watch out.If the tank is fairly old then check it every two
months.Expecially if their is no blatter.
Hope this helps,
Should be a simple operation. The pressure switch should have
adjustment screws, usually one of them will be taller and turning it
changes both the cut-in, cut-out pressure. The differential between
them should be 20psi. A fairly good residential setting is 30/50 but
some sprinklers will be obstinate at the 30 end.
Once you change the pressure, then adjust the tank air to be 2 psi
below the cut-in. Some tanks have a sticker specifying the same as
the low pressure setting (mine does) but I go with the 2psi lower.
Read the pressure from the same guage tho. They don't all read the
same unless you have a high quality one. Best ot use the tank
You should google "Grundfos cu301 Operation Manual" to find
answers to your questions. I have the same system. I is recommended
to ONLY use a 2 gallon pressure tank which should be pressureized to
70% of the pressure setting you want to run at. You can easily
change the system pressure by pressing the pressure buttons on the
controler. You use pressure gauge and air pump (same as you would
use on car tires) to check and change tank pressure. Your pressure
tank should have a valve stem on top, same as on a car tire. I am
not sure you using such a large pressure tank is a good idea. You
should use more forums or contact company that makes the pump to see
if it is OK.
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