This chart details how ambient temperature correlates with the system refrigerant charge pressure, and how it affects high and low side psi readings. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. A/C System Pressure Troubleshooting AC System Pressure Chart - A/C recharge kits Diagrams: System Pressure Chart Get a quick look at what an average A/C system looks like, along with the compressor manufacturer and what the specific R-134a requirements are for your car.
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Refrigerant Pressure Charts The R-134a and R-1234yf pressure charts are for guidance when using A/C Pro ® recharge products and gauges. These charts can help provide an understanding of how much pressure is in your vehicle's air conditioning system, which can be helpful during the diagnostic and recharge processes. NOTE: To properly add refrigerant to a vehicle, the ambient (surrounding)temperature should be above 65° F. A colder temperature does not permit the system to build up enough pressure for an accurate gauge reading. CHARGING INSTRUCTIONS Ensure you have the correct refrigerant and dispensing equipment for your vehicle. 1. Determine Ambient Air If the temperature of the air is 55°F or below, do not charge the vehicle. It is also always recommended to use a charging hose with a gauge. The refrigerant packaging should contain a chart like the one below for determining what pressure to charge the system depending on the ambient air temperature. PRESSURE TEMPERATURE CHART. Similar to R-114 - high ambient air conditioning. R-123 100 B1 0 MINERAL OIL or ALKYLBENZENE Similar to R-11 - low. -30°F), and also provides a closer match to R-500 at air conditioning temperatures. R-409A:A retrofit blend for R-12 refrigeration systems. The pressure
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The high side components of an air conditioning system, such as the compressor, condensing coil, and fan unit used to cool the condensing coil are located outside of the conditioned or refrigerated space, and will be immersed in air at ambient outdoor temperature, say 72 °F. Here is where the magic of air conditioning occurs. As long as the. 1. Outdoor ambient temperature 2. Typical low pressure or suction side, may vary by equipment and metering controls 3. Typical high side pressure, may vary by equipment 4. These psig readings for R-134A are what you'd expect the pressure of the gas to be in an enclosed container at the temperature given and at steady state. Typical low pressure or suction side pressure for R410A is about 120 psi, varying by ambient temperature, here assuming 75°F, may vary by equipment and metering controls. 3. Typical high side pressure for R410A is < 600 psi at an ambient outdoor temperature of 95 °F, may vary by equipment. 4. R134A Pressure-Temperature Chart-49-45: 1-17.2 51: 10.6 101: 38.3-48-44.4 2-16.7 52; 11.1 102; 38.9-47-43.9 3-16.1 53; 11.7 103; 39.4-46-43.3 4-15.6 54; 12.2 104; 40-45-42.8 5-15 55; 12.8 105; 40.6-44. Saturation Pressure-Temperature Data for R134A (psig)* Temp (°F) Pressure Temp (°C) Temp (°F) Pressure Temp (°C) Temp (°F) Pressure Temp.
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Usually, it is called an AC pressure chart but because we are talking about the 134a refrigerant, therefore, we will address it as an R134a pressures chart. This chart provides us with the relation between temperature and pressure of the 134a refrigerant.. Ambient Temperature: Low Side Pressure: Measure ambient air temperature at the vehicle and under the hood WITH A THERMOMETER (do not use weather service temperatures). The static pressure correlates to the temperature of the AC components under the hood, not outside in front of the vehicle. 3. Compare the pressure readings to the pressure-temperature chart below
Step 1: Step 2: Step 3: Summary Is your vehicle's A/C blowing warm air? If so, it is likely low on refrigerant. You can easily fix it yourself by simply adding refrigerant, but how much should you add? It's not a hard question to answer, but it is an important one to get right. Car 1: Outside air was 95°F (35°C) with 85% humidity Car 2: Outside air was 75°F (24°C) with 38% humidity We measured the temperature from the central vent with an AC test thermometer and we got the following results: Car 1: Air temperature coming out the vent was 58°F (14°C) Car 2: Air temperature coming out the vent was 49°F (9°C)
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According to the Department of Energy 1, 78° Fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling. But in reality, this is a question that doesn't have a "one size fits all" answer. • You must know ambient air temperature. Measure temperature about 1-ft in front of the grille. This is really important. Don't go by the temperature from a news or weather service. It must be the temperature of the air coming into your car's condenser. • You must know the type of system in your vehicle — orifice tube
