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What should the super-heat and sub-cooling temps be for 404a refrigerant on a freezer?
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What should the sub cooling be on a txv 404a refrigerant freezer?
42
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.
What should gauges on fully charged central ac unit read?
One would need to know what refrigerant is being used along with the indoor and outdoor temps at the time the pressures are checked to give you an answer. The pressure readings only give you part of the story. Suction superheat and liquid subcooling give you more info to help you rate the performance as well.
Should NEVER heat a refrigerant storage or recovery tank with an open flame because?
Because if you superheat an entrapped gas it will swell and explode.
What should the high and low pressures be for r12 refrigerant on a freezer?
450 psi / 35 psi
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.
What amount of superheat is recommended for R-22?
Superheat depends on the type of metering device you are using in the equipment as well as the current state of the load. With a fixed orifice, the superheat will be high, about 20 to 30 degrees when the box is warm, down around 10-15 when the box is cold. With a txv, the superheat should be constant, normally between 10-15 degrees. It is best to check the superheat at the outlet of the evaporator. this will ensure that the compressor does not slug with liquid refrigerant.
What is the correct suction pressure when charging a freezer using Refrigerant 134a?
Negative 30 psi should do it.
Why does your thawed food taste like refrigerant?
Your freezer may have a leak because thawed food shouldn't taste like refrigerant. You should have a repair technician check it out.
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 should the high and low pressures be for 134A refrigerant on a freezer?
low side 25 psi high side 125 psi
How does an air conditioner cool down air?
The refrigerant absorbs heat from whatever area is being cooled, whether it be the passenger compartment of a vehicle or the interior of a building. The refrigerant is then pressurized and superheated. Once superheat is achieved, the heat from the refrigerant is rapidly exchanged with the ambient air, and the refrigerant which is returned is much colder. A fan blows air over this cold refrigerant in the condenser, and the cold air flows through the vents to cool the area which is supposed to be cooled. That's a bit of a simplified version, but you should get the gist of it.
