Question about Ingersoll Rand Stationary Air Cooled Rotary Screw Compressor 10 Hp, 35 Cfm At 125 Psi, Model# Ep
I have a IR, SSR UP6-15C compressor that I am running in constant speed control. It used to unload at 125 and load at 110. Now it is unloading at 116 and loading at 103. I have adjusted the differential pressure switch but nothing changes, Is the diff pressure switch only used in start stop control? Does the blowdown valve control the pressure and is non adjustable? If so, a new blowdown valve may solve my issue. Thanks John
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Posted on Jan 02, 2017
The pressure switch has an adjustment for the low pressure cut in and the high pressure cut out. If the pressure range is set too close the cycles will be short. You need to work out which setting is wrong by looking at the pressure guage when it is cycling and adjust the pressure switch accordingly.
Posted on Sep 06, 2009
SOURCE: i have a 5SR EP50SE
The blow down is a normally open valve so there will be no voltage when unloaded. When voltage is applied the blow down valve closes and the load solenoid opens allowing air to the inlet valve which should open. I suspect you have a bad load solenoid. If it leaks by it will keep the inlet valve open to some degree depending on how bad its leaking. If this is an older EP50SE you may have a spring in the bottom of the inlet valve that has broken. then there is not enough pressure to close the inlet valve. These are two common problems with this unit. Also if you look inside the controller panel there should be a wiring diagram. It should show 1SV and 3SV wired together. 1SV is the load solenoid and 3SV is the blow down valve. There is no unload solenoid. There is also a solenoid for line / sump pressure and a modulation solenoid.
Posted on Mar 12, 2011
SOURCE: I have a SSR-EP60 air
If the pressure continues to rise, the inlet valve is not closing completely. Remove the top of the air cleaner box and look down at the inlet valve butterfly. When the compressor is down or unloaded, the valve should be held closed by an internal spring in the air cylinder. If it's not, the mounting stud on the bracket may have come loose and moved, or more likely the spring in the air cylinder actuator is broken.
This actuator has gone thru at least 3 revisions. I just replaced the cylinder on our EP60 because the spring had broken in two places and wouldn't come anywhere near closing the valve.
Posted on Jun 14, 2011
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