When I rebuilt my shop's air compressor, I replaced the pressure switch which necessitated adjusting the new one.
In order to do this I needed a similar setup to the actual system in the attic.
While I was thinking about this, it occurred to me that if I bought a small air tank I could also use it to air up a tire away from the house.
I bought a small 1 gal. air tank, The small tank should get up to pressure fast, reducing cut-in/cut-out adjustment time.
12/23/21: Page Origin
|
Sears 30 gal. tank in the shop's attic.
Note 3" nipple at left rear of tank top, is for pressure gauge.
|
|
Closer look at the tank top, in-tank checkvalve is in the foreground, pressure switch nipple is left rear.
|
Air Tank
|
Constructing the stand.
I just needed something simple that would hold the tank upright so water would drain to one end.
|
Click For Larger Pic
|
My current thinking on what I need to adjust the new pressure switch.
With the two substitutions it can also be used as a portable air tank.
|
|
The 1 gal. tank.
Working pressure: 150 PSI max.
|
|
A look at the tank's mount.
I think of this as the back, the tank's legs will be bolted to the stand.
There are four 1/4" NPT females, one on each end and one in front another in back.
|
|
Portable air tank, on it's stand (left), pressure switch, and plumbing parts & pieces.
Nothing is tight nor does anything have teflon tape yet.
|
|
Compressor connetion for testing.
Note the orange 3/8" hose, it connects to the portable air tank.
|
|
Test lash-up.
I don't know that the input valve is necessary, but, it's there!
|
|
Closer look at the tank top with gauge and pressure switch.
Note: you can see the copper unloader line (lower right side) attached to the pressure switch.
|
|
Closer look at the intake, note the valve and the in-line check valve.
Below the valve, the unloader line from the pressure switch and the 1/4" NPT female for the compressor hose to connect into.
|
|
Tank drain valve with compression fitting for 1/4" drain tube.
Also note, on the stand base, the in-tank check valve and flare nut for compressor output, for the tank in the attic.
|
Set Pressure Switch
I bought this LF10-4H pressure switch to replace the 150# switch that came with my Sears compressor
The Sears compressor had failed twice this year (2021) so I am replacing it.
Setting Cut-Out and Differential
|
LF10-4H Pressure Switch.
To adjust the pressure switch:
Pressure range adjusts both the cut-in and the cut-out pressure.
Turn the Range screw CW to increase the pressure range, or CCW to decrease both cut-in or cut-out.
The differential is the adjustment of the cut-in pressure (confusing: some say cut-in others cut-out).
Turn the Differential screw CW to increase cut-in or CCW to decrease it.
Note: for every complete cycle of the screw, the pressure will increase by 2-1/2 PSI to 5 PSI.
It is advisable to keep the pressure band as much higher (more than 20 PSI) to avoid the quick start and stop of the air compressor.
|
