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The unit is restricting air flow - Ingersoll Rand D18IN - Refrigerated Air Dryer 5HP 11 CFM

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MT 600101 oil-less compressor, pdf manual. I specifically would like to know the scfm ratings at 40 and 90 psi.


the air flow from a compressor is determined by the capacity of the pumping system
with a piston type compressor it is the bore by the stroke
in a diaphragm type is it is the diaphragm dia by the stroke
that is the maximum cubic feet of air a minute produced
pressure is the resistance to flow so regardless of the pressure or restriction it will only produce that set air flow at that rpms
do not confuse the flow with pressure as it works like this the greater the restriction the greater the pressure in reserve but the less flow in cubic ft per minute through the restriction
for example a compressor producing 10 cubic feet per minute does that with not restriction but with no pressure
at 25% restriction to air flow the pressure in the tank will now rise to say 25 psi and the flow from the restriction will drop to 8 cubic feet per minute
at 50% restriction the compressor is still putting out 10 cubic feet of air per minute but the tank pressure has risen to 50 psi and the flow from the restriction has dropped to 4 cubic ft per minute
go to the extreme end and the compressor is still producing 10 cubic ft of air per minute , the restriction now allows 100 psi in the tank but the low from the restriction has been reduced to 2 cubic ft per minute
the simple equation is pressure = flow X resistance

Jun 24, 2017 | Air Tools & Compressors

1 Answer

Armstrong ultra SX 93


Restrict the flow on all of the registers on the first floor to get more flow to the top floor.

Jul 15, 2014 | Heating & Cooling

1 Answer

It's not as cold as it used to be


Probably needs a good cleaning of the coils and fins for proper air flow. If it is not dirty you may have a leak in the system, usually small window air units don't leak but larger cenrtral units can leak from soldering joints from the installers. Also clean or replace any air filters, thses block air and can cause the unit to freeze up and restrict even more air flow.

Jun 28, 2011 | Heating & Cooling

1 Answer

I have an AC unit with the model # PDH12K3SD-C the unit stops working and flashes an error cod = "06" anyone know what the error code means?


According to the Owner's Manual if the Error Code flashes "06" the O.D. coil Temperature > 175 Deg
F for 2 consecutive minutes. (Heat Pump models only).

The action taken by the unit is Alternate flash set point and error code. Shut unit down for 5 minutes, then try again 2 times, if fails the 3rd time, then shut down unit.:

All of this is can caused by several things:

• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted air flow
• Improper refrigerant charge
• Restriction in refrigerant circuit

The dirty filters, dirty coil and restricted air flow you can troubleshoot and solve yourself. The reaming ones should be handled by a an authorized service technician.

Here's a link to your Owners Manual, that you can download and print for future reference.

http://www.ajmadison.com/ajmadison/itemdocs/92008705_9-07_PTAC_IO_manual.pdf


Hope this helped to to troubleshoot and solve the problem . Please let me know. Thanks.

Jun 10, 2011 | Friedrich PDH12K3SD Air Conditioner

1 Answer

GE dryer will run but no heat


this issue is almost always a breaker tripped, or restricted air flow. Verify air flow by removing hose at back of unit, and form opinion of air flow; hook back up and see if you have the same air flow outside the building. Any restriction will trip thermal limiters (auto resetting).

Breaker needs to be turned FULLY off and back on, then test for heat.

Mar 26, 2011 | GE Dryers

1 Answer

Not much heat and clean filter light comes on when filter is clean


This sounds like air flow restriction. Test by disconnecting the hose at the back of the unit, form an opinion of air flow and see if filter light stays off.

If ithe filter light stays off while running with hose disconnected, hook the hose back up and investigate the restriction in the hose, next most likely place to look is at the discharge opening at the exit of the building.

If the filter light is still on, you likely have a restriction or lint build up inside the unit, you have to unplug, open the unit and find the restriction.

Mar 06, 2011 | Siemens Dryers

1 Answer

My amana nde5800ayw has been taking hours to go through a dry cycle. What can I get to fix this. Thanks


If the unit is getting hot then the most common problem is air flow restriction.

Make sure the unit is not pushed to far back against the wall to block or pinch off the ducting,then when the unit is running go outside and find the vent and feel how week or strong the air flow is.

If the air flow is week then you have a restriction some where in the main vent line and needs to be cleaned.

You can use a leaf blower if you have one to stick in the ducting on the inside of the house and blow everything to the outside make sure to remove the outside cover first.

Dec 02, 2010 | Amana Dryers

1 Answer

I have a Coleman Central Air Conditioner/Heat Pump. On the cooling mode the coils inside the unit in the basement continue to freeze up causing no air flow. I relpaced the filter thinking it might have...


The most common reason for freezing up is 'air flow,' and since you've already changed your filter - have you checked out the coil (the one that cold air comes from) to see if it's clean? If the filter you changed was really 'bad dirty' then it's a good bet the coil could be dirty also - thus restricting the air flow.

If you're satisfied that the coil is clean - about the only other thing it could be - is 'low on refrigerant,' which of course will take a Service Tech to find the leak, repair it and then re-charge the unit with refrigerant.

One other thing you might think about - are you running the blower motor on 'low speed?' If you are then put it on 'high' and see what happens.

Again, the most likely cause of your problem is air flow or 'low load,' - so I would really look hard for an air flow problem of some sort.

hope this has helped a little

Jun 20, 2010 | Heating & Cooling

1 Answer

Running high head pressure in heating cycle runs fine in a/c cycle


Check your indoor air filter. When the unit is in heat pump mode the indoor unit is cooling the air, ie. removing the heat from the unit. If the air flow is restricted then the unit will run high head pressure. If the filter is clean then maybe something else is restricting the air flow of the indoor unit. The other possiblity is that the unit is over charged. When in cooling the overcharge will not create the problems that it will in heating mode. The only proper way to charge a heatpump is to remove ALL the refrigerant and then wiegh in the proper amount of refrigerant into the system.

Nov 19, 2009 | Heating & Cooling

2 Answers

My ac unit


air conditioners freeze up for one of 2 reasons, #1 restricted air flow, is the filter, /orthe evaporator (cool) coil clean?
#2 it is low on freon, causing the coils to be colder than they should be.

Nov 13, 2007 | Heating & Cooling

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