There is no such thing as normal head pressure. It is all based on temperature and calculations. Need to know indoor air temp, outdoor air temp, wet bulb versus dry bulb. Need to know specifics. so when outside ambient temp is 90 and I'm running 255 head with a clean condenser. that isn't normail head pressure? that's pretty normal to me. working with r22 the correct answer would be. If you are sure your head pressure is where it should be, with correct freon type. low suction pressure can be caused by no blower motor, closed or blocked registers, clogged filter or evaporator, lack of airflow, undersized evaperator or oversized AC, restricted metering device(TXV, piston) blocked returns. but he is right you need a lot more info what's your superheat/subcooling? what's your delta T, is you head pressure really wre it should be? what's changed since this started happening. How low issuction pressure what's your evap saturation temp? is coil freezin up? what are your pressures exactly is condenser temp 30 degrees warmer than outside temp. with r22. do you know what you are doing????
To prove a bad suction reed in a compressor, you would need to do a pressure test. You can isolate the compressor and check for pressure drop in the suction line. A significant pressure drop would indicate a faulty suction reed. Additionally, you can inspect the reed valve for visible signs of damage or wear.
Yes, a suction cup would not work in a vacuum because there is no air pressure to create the necessary force for the suction cup to adhere to a surface. Without air pressure to push against, the suction cup cannot create the vacuum required to stay attached.
What type of low head pressure are we talking about? List the pressures and refrigerant type along with the indoor and outdoor conditions at the time the pressures were observed and we can be of more help. I've done a few new installs lately. residential splits, r22 and normal conditions say 80 degrees and not humid. when charging the units i was getting a good suction pressure, around 68-70psi, the suction line was coming back nice a cold and the liquid line was warm. but for some reason i was getting a super low head pressure, around 150-175psi. any ideas cause im at a loss. i did everything right and the systems were even running great. any help would be appreciated. if the indoor space was warm that wouldn't drop my head pressure right, i thought it would be high
In an alcohol barometer, the alcohol level would rise to about 13.6 inches at normal atmospheric pressure.
The number of suction cups required to lift a 100-gram object would depend on the size and strength of the suction cups. Generally, multiple suction cups would be used to distribute the weight evenly and ensure a secure grip. It is best to consult specific suction cup specifications or conduct tests to determine the exact number needed.
To prove a bad suction reed in a compressor, you would need to do a pressure test. You can isolate the compressor and check for pressure drop in the suction line. A significant pressure drop would indicate a faulty suction reed. Additionally, you can inspect the reed valve for visible signs of damage or wear.
When you say too high, just how high is it and what is the high side pressure. It is not uncommon for the suction pressure(lowside) to get up to 80psi on a very hot day. You cannot determine what is wrong unless more information is provided. It could be that your system is overcharged, but without the high side pressure and the temp of the suction line it is hard to give the right answer.
Yes, a suction cup would not work in a vacuum because there is no air pressure to create the necessary force for the suction cup to adhere to a surface. Without air pressure to push against, the suction cup cannot create the vacuum required to stay attached.
What type of low head pressure are we talking about? List the pressures and refrigerant type along with the indoor and outdoor conditions at the time the pressures were observed and we can be of more help. I've done a few new installs lately. residential splits, r22 and normal conditions say 80 degrees and not humid. when charging the units i was getting a good suction pressure, around 68-70psi, the suction line was coming back nice a cold and the liquid line was warm. but for some reason i was getting a super low head pressure, around 150-175psi. any ideas cause im at a loss. i did everything right and the systems were even running great. any help would be appreciated. if the indoor space was warm that wouldn't drop my head pressure right, i thought it would be high
High head pressure; low suction pressure; overheated compressor
I guess that would be measured in units of pressure: Pascal = Newton/meter2.
Normal blood pressure in an adult would be 120/80
This could indicate issues like improper refrigerant charge, dirty evaporator or condenser coils, a clogged filter, or a failing compressor. It's important to have a professional HVAC technician diagnose and address the specific problem to prevent further damage to the system.
The pressure should be equal to a saturated suction temperature of around 40*F. The pressure would differ depending on which refrigerant is used.
Depending in the hydrant suction, pump pressure should be about 80-100 psi
Normal oil pressure at idle would be about 30 psi. Minimum would be about 10.
high head pressure and a higher supply temp.