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Why would your air conditioner have a normal suction pressure and low head pressure with a 14 degree temperature difference?
Wiki User
∙ 12y ago
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
Wiki User
∙ 12y ago
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How do you measure fre-on?
On smaller residential air conditioners the manufacturer publishes a charging chart that has the outside air temperature and the corresponding suction and liquid pressure measured by a refrigeration manifold set, gauges. If the chart is not available, you can estimate by measuring the suction pressure and then using a pressure temperature chart for your refrigerant and trying to maintain a 35 degree to 40 degree temperature at the condensing unit or compressor. The other measurement on larger units is the subcooling measurement, measure the actual liquid line temperature and compare the liquid pressure using a pressure temperature chart and also checking for bubbles in the liquid line sight glass. On larger systems after the subcooling has been checked then the superheat has to be checked and the thermostatic expansion valve adjusted if necessary. To check the superheat, measure the suction pressure, convert to a temperature and then measure the actual suction line temperature. The difference is the superheat, should be 6 to 20 degrees depending on the system.
When an evaporater experiences a heat-load increase the suction pressure does what?
The suction pressure increase.
What is negative suction?
pressure
What will cause the suction pressure to rise?
head pressure
What does the head pressure do if the suction pressure rises?
the head pressure will rise
Why would your air conditioner have a normal to slightly high suction pressure and low head pressure with a 3 to 5 degree temperature difference?
What you're describing sounds suspiciously like a worn compressor.
How do you use the temperature pressure table when measuring suction pressure on your split system air conditioner?
i think you subtract the evaporator temp from the outside temp?
What is the fan speed relationship to suction pressure?
for a given air conditioner: the faster the condenser (outdoor) fan the lower the suction pressure. the faster the evaporator (indoor) fan the higher the suction pressure.
How do you determine what suction pressure should be in R22 air conditioning compressors suction line?
The proper suction pressure of any air conditioning or refrigeration system is determined by the type of refrigerant used and sometimes the amount of charge. : Suction pressure used is also directly related to the temperature required. : The temperature required in the evaporator relates to the pressure required in the suction line since, the fluid is at saturation in the evaporator. : Knowing the temperature required, use the fluid's saturation tables to find the corresponding pressure required.
What is the superheat if the suction pressure is 60 psig and the suction line temperature is 40 degrees?
-5 something is wrong
What is suction power?
A force over an area produced by a pressure difference
What is a suction line on an Air Conditioner?
The suction line connects the evaporator outlet and the compressor intlet. Low pressure refrigerator vapour is drawn from the evaporator to the compressor through this line.
What is the purpose of the external equalizer on a TXV?
The purpose of the External equalizer on the TXV is to compensate for the pressure drop in the evaporator coil , This is done since the superheat calculation is based on the difference in the Saturation temperature corresponding to the Suction pressure (Measured after the coil) and the actual suction line temperature. Now, in a TXV measurement of actual line temperature is accomplished by using the Sensing Bulb and the Measurement of the Suction pressure by the External Equalizer of the TXV. The opening/Closing of the Expansion valve is controlled by the setting of the superheat which is governed by the setting of the Spring.
What indicates a problem while inspecting a suction line of an air conditioner?
"What" on the suction line of an air conditioner indicates a problem?
How do you measure fre-on?
On smaller residential air conditioners the manufacturer publishes a charging chart that has the outside air temperature and the corresponding suction and liquid pressure measured by a refrigeration manifold set, gauges. If the chart is not available, you can estimate by measuring the suction pressure and then using a pressure temperature chart for your refrigerant and trying to maintain a 35 degree to 40 degree temperature at the condensing unit or compressor. The other measurement on larger units is the subcooling measurement, measure the actual liquid line temperature and compare the liquid pressure using a pressure temperature chart and also checking for bubbles in the liquid line sight glass. On larger systems after the subcooling has been checked then the superheat has to be checked and the thermostatic expansion valve adjusted if necessary. To check the superheat, measure the suction pressure, convert to a temperature and then measure the actual suction line temperature. The difference is the superheat, should be 6 to 20 degrees depending on the system.
How do you calculate suction pressure for air theoretically?
Air has a pressure, but not a suction pressure. Air pressure is measured with a barometer, you do not calculate it. Suction pressure is a concept which applies to a pump. Suction pressure = static pressure + surface pressure - vapour pressure - friction pressure.
What is vapour binding?
when pressure on the suction side of the pump drop below the vapour pressure of the liquid, vapour forms. It's caused because of insufficient suction head, high suction lift, excessive friction head, or high liquid temperature.
