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What should the refrigerant pressure be on an ice machine using r 404?
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How do you calculate the subcooling in HVAC?
To calculate subcooling in HVAC, you need to measure the liquid line temperature and pressure. First, convert the pressure into temperature using a temperature-pressure chart. Subtract the liquid line temperature from the converted temperature to calculate the subcooling. Subcooling is important to ensure the liquid refrigerant leaving the condenser is cooler than its saturation point to prevent the formation of flash gas in the metering device.
How do heating and air conditioning work?
An AC system is a refrigeration system just like your refrigerator, it operates by changing the physical state of a refrigerant via evaporation to remove heat and condensing to reject the heat removed out doors. Upon a call for cooling from the thermostat, a 24 volt signal is sent to the AC unit outside where it energizes a electromagnetic relay called a contactor, it pulls the normally open switch closed just as an electromagnet picks up scrap metal in a scrap yard, The electrical current creates a powerful magnetic field that sucks the normally open switch closed, this sends 230 volts to the compressor which begins to run. A cool ,low pressure vapor is pulled into the compressor from the evaporator coil, it will be approximately 70 psi and 40F degrees, if using R 22 refrigerant. As it may be 100F or more outdoors, the compressor must bump up the cool low pressure vapor up to a hot high pressure vapor, it will pump it up to about 30F degrees above the outdoor ambient temperature, this is so that regardless of how hot it may get out side, the refrigerant is hotter, thus able to reject heat to the relatively cooler out door air, thus condensing the vapor refrigerant into a liquid refrigerant that is still hot but a high pressure liquid. The hot high pressure liquid is sub cooled to about 15F degrees below the condensing temperature That will be about 125 F @ 270 psi, again if using R 22 refrigerant. The hot high pressure liquid refrigerant is then sent to the metering device, this is what delineates the hot high pressure side from the cold low pressure side. Imagine you have a mouth full of water and a straw in your mouth, if you blew hard the water will spray out the end of the straw and upon exiting the straw the liquid refrigerant "boils" changes state liquid to vapor just as boiling a pot of water boils or changes state if raised above 220F at sea level 14.7 psi atmospheric pressure. The clod low pressure vapor exits the evaporator coil and is sucked into the compressor for the next trip around and around evaporating and condensing the refrigerant to remove heat and to then reject heat.
What is the work that goes into a machine called?
what type of machine? Is it one that you are using or fabricating?
Advantages of a franking machine?
It is fast using
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.
What is the correct suction pressure when charging a freezer using Refrigerant 134a?
Negative 30 psi should do it.
What is the running pressure of car airconditioning suction and discharge pressure using 134a refrigerant when operating?
35suction pressure in 1000 rfm
What is the correct suction pressure whin charging a chiller using refrigerant 134a?
926.5
Why using low pressure tube in air cond?
If your talking about an Orifice tube?, It is used to convert high pressure refrigerant to low pressure refrigerant which then enters the evaporator. As the blower motor pushes warm air thru the evaporator, the refrigerant turns from a liquid to a gas which cools the air.
When did VW start using R-134a refrigerant?
please give me pressure knowledge for refrigerator
What is the low side pressure of a freezer using R 404A refrigerant?
if room tem is 70f 15psi
What is the low side pressure of a freezer using R-404A refrigerant?
if room tem is 70f 15psi
What is unlikely to affect refrigerant charge accuracy Ac compressor failure to calibrate the scale not accounting for refrigerant hoses using pressure reading to determine corr?
Ac compressor
How do you put freon in 2006 Chrysler town and country?
It does not contain Freon, it contains R134a refrigerant. Put it in using the low pressure connection.
To maintain 40 degree evaporator coil temperature what is the suction pressure?
It depends on the refrigerant you are using, for R-22 it's 72 psi
Can the pressure of a CPAP machine damage a person's ears?
A CPAP machine can damage a person'a ears. The CPAP blows air into the middle ear using pressure and causes problems that are difficult to treat.
Can you mix R401a and R409a?
No. You absolutely cannot mix any refrigerants. You should completely recover all the old refrigerant and charge the system, with the new refrigerant, using the superheat method.
