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3 Signs of High Discharge Pressure On AC Units in Phoenix

By // 2016.05.31

High Discharge Pressure On AC Units in PhoenixHigh discharge pressure on AC units can cause all sorts of secondary problems down the line. HVAC systems are closed environments, so any abnormalities in AC refrigerant lines can cause undesirable consequences elsewhere. High discharge pressure on AC units in Phoenix can therefore cause all sorts of problems with your AC unit, including icing on your evaporator coils, poor performance and low efficiency.

Luckily, there are several ways to tell if high discharge pressure is the issue at hand by looking for the following symptoms. Also, if any of these symptoms read like all Greek to you, remember that you can simply call a Phoenix AC repair company to take care of the diagnosing and repairs for you.

High Condensing Temperature

Your AC unit condenser is the device that causes the refrigerant to change from a gas into a liquid, venting excess heat and raising the pressure in the line ahead as a result. However, if your condensing temperature gets too hot, it can lead to excess pressure upon the evaporator intake line among other problems.

Most HVAC units in Phoenix have a convenient feature that allows you to quickly determine the temperature of the liquid refrigerant coming out of the condenser line. A pressure gauge will be located on the “high” side of the refrigeration system. Read it to determine that side of the system’s pressure, and then convert that pressure into a temperature using a conversion chart. Locate the type of refrigerant your system uses, then trace the corresponding temperature.

A high condensing temperature is one in excess of your AC system manual’s benchmarks and guidelines.

Low Evaporator Pressure and Temperature

Low evaporator pressure and temperature can both lead to problems like icing. They are also indicative of high discharge pressure on AC units in Phoenix. To determine your evaporator’s current temperature and pressure, read the gauge on the low side and convert to temperature once again using the tables provided above.

Causes for low evaporator pressure and temperature can include restricted airflow, dirty evaporator coils, a broken evaporator fan motor and a clogged condenser screen.

High Compression Ratios

Your compression ratio is the ratio of the pressure on the “high” side of the line near the condenser and the “low” side of the line near the evaporator. High compression ratios mean that there is an excess of pressure coming out of your discharge line or something causing low pressure in the evaporator line.

Measure your high side and low side gauges, and then divide the high side by the low side. Large compression ratios in excess of your owner’s manual guidelines let you know that something is awry along the line.

Fix Your Phoenix AC Unit Hassle Free with Hays

If you determined you had a problem according to one of these symptoms or other undesirable AC unit behaviors, you can always contact a Central AC repair company in Phoenix to detect the true problem and solve it—keeping you nice and cool all summer long.

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Contact the AC repair experts in Phoenix at Hays Cooling & Heating to get your air conditioner back up and running. Email us or call 602-714-8270 now!


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  • 3 Signs You Need an Air Conditioner Refrigerant Recharge
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    Chris Hays

    Chris and Stacia Hays, are the owners of Hays Cooling and Heating; a family owned and operated HVAC company in Phoenix founded in 2001 that services both commercial and residential customers. Chris leads a team of certified technicians who have over 45 years of combined experience and has earned and A+ rating with the BBB and a strong five star rating online. Hays Cooling and Heating focuses on providing support to their customers every step of the way, with exceptional service and competitive prices. If you are looking for top-notch air conditioning and heating service, contact, Chris or Stacia today at (602) 714-8270.

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