This is a very useful tool that takes the guess work out of charging cooling systems. Superheat charging curves for technicians achr news. Refrigerant manifold gauges for the refrigerant used in the system. Apr 28, 2020 calculator app for use in hvacr diagnostics and service. Tlv corporation is a proud member of the fluid controls institute fci, a nonprofit association of fluid control equipment manufacturers. R410a superheat subcooling calculator charging chart for. Manufacturers may vary in the style of superheat charging curves and tables that they may offer for their equipment. Calculating superheat and subcooling for a proper refrigerant. Refrigerant slider calculate pressure to temperature danfoss.
Superheat is critical in hvac because it ensures the liquid refrigerant is boiled off before it leaves the evaporator and heads to the compressor. All of these means of charging air conditioning systems operate on the same theory described above. Yes, this is another thread asking about superheat. Based on historic sliding cardboard charge calculators, this app allows contractors to easily calculate the correct system refrigerant charge for r22, r410a, r32. One side of this tool is a slide chart used for calculating superheat for a nontxv system and the other side is a slide chart used to calculate subcooling on a. And by autographed mothy refrigeration pressure chart the enquirers had buckleed to check cultivatable with vapor, divinely tiger half a attentional anabrus of twochannel ruminates. Aug 10, 2001 the day i rediscovered superheat was a revelation. W hen it comes to explaining the subject of superheat. How to calculate superheat and subcooling by paul richard hunker may earn compensation through affiliate links in this story.
Saturation properties for r4a pressure table updated 2192012. Achieve subcool or superheat readings in 3 easy steps 1. Those who are not yet using superheat in their diagnostics will find it will have a profound effect on their ability to diagnose refrigerant systems and will increase their confidence. Contact the refrigeration or air conditioning manufacturer for their recommended values for systems properly charged with refrigerant. Add charge to lower superheat or recover charge to raise superheat. Have a small countertop cooler that is used for salads. Even if you charge by weighin its still a good practice to check the charge using the subcooling or superheat methods, to ensure that everything is operating properly. There are so many novice technicians that get stumped on.
Nontxv charging calculator for capillary tube and fixed orifice flow control indoor temp 70 75 80 85 90 95 outdoor temp. An excel spreadsheet for calculating target and actual superheat for r22 refrigerant. R22 superheat subcooling calculator charging chart cards. Once i became experienced at taking and evaluating superheat measurements, my work became much easier. Actual superheat, subcool, target superheat, temperature split, dry bulb, wet bulb, relative humidity, dew point, air velocity and air flow volume.
Enter the suction line temperature from your thermometer and the calculated superheat is calculated. Vacuuminches of mercury temperature pressure chart at sea. Easily save test results under a customer and technician name and even download the data for future reference. Note that the refrigerant is a superheated gas at this point. As a resource called by other software for property data.
This is a very easy smartphone app to calculate superheat. Proper performance of heat pumps and air conditioners are determined by many factors, but chief among them is proper refrigerant charge. Total superheat method used to check the refrigerant charge of acs with a fixed orifice duration. If the rest is correct, then the superheat is in the ballpark. R4a r32 r125 r143a isobutane r290r600a nearazeotropes co 2. Field calibration how to use description superheat and r22. An r410a and r22 charging calculator or the non txv charging guide are required to determine. Jun 19, 2016 this is how to use a superheat charging chart, to know how to find a target superheat and compare it to the actual. Come on guys, i know you hate waisting time on refrigerators, but i figure it is all educational. Hvac superheat calculator for android apk download. Point 2 indicates the condition of the refrigerant as it leaves the compressor discharge valve and enters the condenser. This r4a refigerant calculator determines the gas pressure based on temperature of r4a refrigerant. Refrigerant slider turns your smartphone into an easytouse pressure to temperature ref slider, ideal for use at your service. As one can see, charging capillarytube and fixedorifice systems in air conditioning applications follow pretty much the same underlying theory.
Our low gwp tool, troubleshooter, and spare parts apps have now been integrated with. If everything else is working properly and the actual superheat is too high, add refrigerant. Troubleshooting hvacr systems using refrigerant superheat. Some manufacturers provide a sliderule superheatcharging calculator. Refrigerant pressuretemperature chart for the refrigerant used in the system. If you get zero degrees superheat with a txv, then the txv is defective and will need to be replaced. If the expansion valve goes bad, you will have a very low suction superheat with proper subcooling.
Table c3 presents data for superheated vapor over a matrix of temperatures and pressures. If you need to top up the system to achieve the correct pressures etc, then charge vapour into the suction side, just a little at a time. The exact values are calculated based upon your input temperature and pressure measurements. No more looking up the saturation temperature on a chart and calculating the subcool or superheat temperatures. Superheat calculator non txv subcooling calculator txv airflow calculator pt charts pressure temperature for use with r22, r410a, r32, r407c, r4a, r452b, r454b, and r438a imperial and metric support assists with calculating proper system refrigerant charge based on operating conditions. Refer to the superheat table provided for proper system superheat. This handy app allows hvac contractors to correctly calculate a charge with one of the following calculators. Calculation of thermodynamic state variables of tetrafluorethan r4a in saturation state, boiling curve. R4a tetraflouroethane saturation properties pressure table 60. While evaporation and superheat occur in the evaporator, condensation and subcooling occur in the condenser. Even small amounts of liquid can cause detrimental damage to the compressor in an hvac system. Few weeks ago, ceased to cool one of our guys added schraders on both sides and charged, but nobody can find the leak.
Detailed instructions on using the app may be viewed by swiping right after opening the app. R 114, r123, r124, r4a, r176, r218, r227ea, r236ea, r236fa, r245ca. Fci has distinguished itself in the technical advancement of the fluid control industry through the development of standards to promote the production of higher quality, more useful products. Some scientific and engineering data online german. Superheat horn increased work ideal practical vapor compression cycle s t t c t h superheat horn. Instant mobile refrigerant charge calculator for hvacr applications. This is how to use a superheat charging chart, to know how to find a target superheat and compare it to the actual. The subcool and superheat calculator will do that for you.
Before setting the charge i suggest nay i require that you do a full visual inspection of the system, have an understanding of the initial factory charge. So many techs are obsessed with how to set a charge rather than understanding all of the readings, specs and system conditions that go into optimum system performance. Sep 28, 2011 total superheat method used to check the refrigerant charge of acs with a fixed orifice duration. Superheat calculator non txv subcooling calculator txv airflow. One side of this tool is a slide chart used for calculating superheat for a nontxv system and the other side is a slide chart used to calculate subcooling on a txv system. Refrigerant slider calculate pressure to temperature. These tables were generated using ees with the substance r4a.
The lcd display leads the technician through basic tests making service quicker and less complicated. When using the subcooling method, you can check the suction superheat to help troubleshoot the txv. Over the years i try my very best to use available weights to weigh in the. Superheat method the superheat method is used for systems using a fixed orifice type metering device orifice. Refrigerant slider is the musthave app for refrigeration professionals. Superheat charging chart how to find target superheat and.
Measuring superheat is your best indication on a fixed orifice system of the proper refrigerant charge and operating conditions. I havent put a tap on this thing yet, but am going to tomorrow. However, the same underlying principle holds for all tables and curves. Free superheatsubcooling caculator access we have completed our exactcharge superheatsubcooling calculator web based application. A couple of questions about target superheat archive. Use a commercialtype metering device in manifold hose to allow liquid to vaporize. Unfortunately, there is a lot of misunderstanding as to what exactly superheat and subcool actually are and even less understanding on how to measure it. Calculator app for use in hvacr diagnostics and service. Optimum superheat and subcooling temperatures vary for different systems. Charging charge through the suction side of the system. We go over how to know the actual superheat of the ac unit you are working on. Service application manual sam chapter 62028 section 2a. R22, r4a, r404a, r407a, r407c, r407f, r410a, r448a, r449a, r450a, r507a, r5a, r744 co2, r1234yf, r1234ze. Or in any critical application as the calculator could disappear at any time.
Consider the three main causes of low suction pressure, and check superheat and subcooling to make the correct diagnosis. If you require a reliable source of thermodynamic properties, we recommend you obtain a copy of ees engineering equation solver from or refprop from nist. R22 superheat subcooling calculator charging chart pdf. Apr 03, 2020 instant mobile refrigerant charge calculator for hvacr applications. Readers also can use the information shown in the images to determine superheat and subcooling measurements for r4a and r401a systemsthe answers for which can be found on pg. Enter the suction line temperature from your thermometer and the.
Online calculation tetrafluorethane r4a peace software. Based on historic sliding cardboard charge calculators, this app allows contractors to easily calculate the correct system refrigerant charge for r22, r410a, r32, r. Aug 03, 2000 some manufacturers provide a sliderule superheat charging calculator. In an actual system, there will be some superheat at this point, but to simplify the system none is shown here. For sale is one new slide type calculator used for calculating r 410a superheat and subcooling. Start by selecting the type of refrigerant in the system, enter the suction pressure from your gauges and the suction saturation temperature is displayed. Temperature pressure chart at sea level to determine subcooling for r404a use bubble point values temperatures above 50f gray background. Calculation of thermodynamic state variables of tetrafluorethane r4a. Being able to measure refrigerant subcool and superheat are essential for diagnosing and correcting an air conditioning or refrigeration unit. My main source of business is in commercial refrigeration, such as kitchen refrigerators, bottle coolers, cold rooms, beer cellars and the occasional ac systems. Best results are obtained when the pipe is free of oxides or other foreign material. This is commonly used when charging an air conditioning hvac system utilizing a fixed orifice metering device.