New Pressure Switch -- Low Water Pressure - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 12-02-2008, 05:32 PM   #1
Newbie
 
Join Date: Dec 2008
Posts: 2
Rewards Points: 10
Question

New Pressure Switch -- low water pressure


Hello,

I recently replaced a gummed up pressure switch (plugged with sediment). I replaced the switch with the standard switch off the shelf at the hardware store which was a 30/50 psi switch (this was the only type they had stocked). I didn't realize it until afterwards that the switch I removed was an older 20/40 psi switch.

After replacing the switch, I'm finding the water pressure to be a bit weaker than when the previous switch was running. The pressure guage seems to be reading correctly - cuts in at about 28 psi and cuts out at just below 60 psi. If anything this should be providing greater pressure than before.

My question is whether I need to do anything with the pressure tank to match the new pressure switch. I thought I read somewhere that the pressure tank needs to be pressurized to 2 psi below the cut-in pressure. Should I add air to bring it up to 28 psi (or 26 psi in the case of my switch)?

Are there any other thoughts on what could be causing low pressure when the actual guage seems to be reflecting reasonable pressure?

Thanks!!

Advertisement

chach is offline   Reply With Quote
Old 12-03-2008, 11:29 PM   #2
Long-Time DIYer
 
Mike Swearingen's Avatar
 
Join Date: Mar 2005
Location: On Albemarle Sound In Northeastern NC
Posts: 1,460
Rewards Points: 500
Default

New Pressure Switch -- low water pressure


If the new pressure switch is factory pre-set for 30-50, then you need to check the air pressure in the bladder tank.
With the pump off and all water pressure drained down, check the tank air pressure with a tire gauge. It should be 28 psi.
If it is too low, air it up with a bicycle pump or portable air tank or compressor to 28 psi.
You can have a number of things that could be causing the drop in pressure.
Mike

Advertisement

Mike Swearingen is offline   Reply With Quote
Old 12-04-2008, 10:15 PM   #3
Idiot Emeritus
 
Join Date: Mar 2008
Location: Fernley, Nevada (near Reno)
Posts: 1,642
Rewards Points: 1,078
Default

New Pressure Switch -- low water pressure


Just because 20/40 was stamped on the original pressure switch doesn't mean the actual cut-in pressure was 20 PSI and cut-out was 40.

Almost all pressure switches can be easily adjusted, a 20/40 model could be adjusted to as high as 60/80, some of them even higher.

If the house and the pressure tank are at about the same elevation, 30 PSI is pretty low pressure. 40 or so would be about the minimum. Try adjusting it up a bit.

If this new switch has an adjustable differential, back it off as far as possible. 10 or 15 PSI of difference is much better, but if you have a small pressure tank, you'll short-cycle the pump, and it won't last very long.

If all this talk about pressure is just a bunch of gibberish, write back. Several of us can explain the actual hows and whys of a water system, and help you dial it in just right.

Rob
micromind is offline   Reply With Quote
Old 12-05-2008, 05:20 PM   #4
Newbie
 
Join Date: Dec 2008
Posts: 2
Rewards Points: 10
Default

New Pressure Switch -- low water pressure


I'll play around with the adjustments and the pressure tank taking these things into account. Thanks for the advice from both of you.
chach is offline   Reply With Quote
Old 01-18-2009, 10:50 PM   #5
Member
 
Join Date: Jan 2009
Posts: 30
Rewards Points: 25
Default

New Pressure Switch -- low water pressure


If you havent figured out your problem already i have some suggestions.
Im a licensed water well installer.

set Preasure switch to turn on at 40 and off at 60, that is a normal setting for a single home.

then air up your preasue tank to 38 psi that will give you all the water from the tank just before the pump turns on.

good luck
lilh2o3 is offline   Reply With Quote
Reply

Tags
pressure , pressure switch , pressure tank , well water


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
leaking pressure relief valve on heating water boiler benjamintr HVAC 13 01-29-2011 06:32 AM
Bad pressure switch? gshock HVAC 3 11-13-2007 08:15 PM
water pressure problem rgmetro Plumbing 6 04-09-2007 04:57 PM
Periodic release from (I think) the T&P valve on the water heater alexz Plumbing 3 08-15-2006 11:31 AM
New Water Heater, worse pressure Repoman75 Plumbing 6 04-16-2005 12:30 AM




Top of Page | View New Posts