Freezer superheat 404a

Temperature and pressure chart for refrigerants R22, R410A, R12, R134A, R401A, R409A, R502, R404A, R507A, R408A and R402A.

Re: Help with r404a Freezer. You get line frozen when line is at temperature below 0°C, or sweating when line is below dew point of surrounding air. If you have any superheat at compressor entrance, than compressor doesn't getting any liquid regardless if suction line is sweating or freezing.I started up a 404a walkin freezer. Unfortunately the system was empty and no info as far as the charge. It does have a receiver. I vacuumed the system and filled into the liquid side with solenoid open until pressure equalized. Issue im having is getting the charge set for winter operation. Most what ive read online deals with setting the system up flooding the condenser with a head pressure ...Being able to measure refrigerant Subcool and Superheat are essential for diagnosing and correcting an air conditioning or refrigeration unit. ... (R-410A, R-404A, & R-134A are excluded from this.) This helps us keep compliant and prevents any and all future headaches for you or your company down the road.Superheat, and 70% compressor isentropic efficiency (see Table 3). These conditions were selected to closely match the R-404A baseline freezer test runs during the last minute of pull-down. XL40 is shown as having higher capacity than R-404A, while XL20's capacity is slightly lower. Both replacements showed slightly higher efficiencies than R ...A lot of low temp freezers use active liquid subcooling in order to allow a smaller evaporator and other savings. ... 15HP compressor, running R507A at -40F SST and 90F SCT, 10F of useful superheat and 20F of total superheat. The result is a 1.3x increase to evaporator capacity, with the only input change being an increase from 10F to 50F ...Sep 22, 2014 ... This one covers how to charge the medium temp reachin cooler. This video is part of the heating and cooling series of training videos made ...

This was a call on a walk in freezer that was not getting cold enough, i found that the expansion valve was not working properly and caused the superheat to ...Temp. Temp. Temp. Temp. Temp. Temp. Temp. Temp. ( F) Liquid Vapor ( C) ( F) Liquid Vapor ( C) ( F) Liquid Vapor ( C) ( F) Liquid Vapor ( C)-49 0.9 0.3 -45.0 1 34.7 33.6 -17.2 51 107.2 105.6 10.6 101 240.2 238.1 38.3-48 1.3 0.7 -44.4 2 35.7 34.6 -16.7 52 109.2 107.6 11.1 102 243.6 241.5 38.92. Then take the suction pressure and convert it to temperature on a temperature/pressure chart. Subtract the two numbers to get superheat. For example, 68 psi suction pressure on a R-22 system converts to 40 ° F. Let's say the suction line temperature is 50 ° F. Subtracting the two numbers gives us 10 ° F of superheat.Chemical Formula CHF 2CF3/CH3CF3/CH2FCF. 3. (44/52/4% by weight) Molecular Weight 97.60. Boiling Point at –46.45 °C (–51.62 °F) One Atmosphere. Critical Temperature, T. c. 72.07 °C (161.73 °F) 345.22 K (621.40 °R) Critical Pressure, P. c 3731.5 kPa (abs) (541.2 psia) Critical Density, D 484.5 kg/m3 (30.23 lb/ft3) c. Critical Volume, V.Genetron® 404A (R-404A) A non-ozone-depleting replacement for R-502 in low- and medium-temperature commercial refrigeration systems. Overview. Specifications. Resources. SKUs. Save this page as PDF. A non-ozone-depleting replacement for R-502 in low- and medium-temperature commercial refrigeration systems. Search SDS Number in SDS Finder - 09893.

There you have it. We believe that you have all the information you need about R-407A. In our opinion, the refrigerant is an ideal R-404A replacement than it is for R22. Energy efficiency of the machine will increase if you use it in a 404A machine. Other Relevant Links. Wikipedia - R407A Refrigerant; darment.eu/ - a low-GWP alternative for ...If you are in the market for a large upright freezer, there are several important factors to consider before making your purchase. With so many options available, it can be overwhe...Compressor Superheat.... Walk In Freezer R404a Suction dry bulb temperature = 35 deg F Suction pressure = 24 psig = -10 deg F What is the superheat? To me it's as simple as adding the 35 and the 10 together which would give you a superheat of 45 deg. But then I haven't even worked with DX systems for over ten years until just recently.*Red Italics Indicate Inches of Mercury Below Atmospheric Pressure Saturation Pressure-Temperature Data for R407A (psig)*

Truist bank panama city fl.

Originally Posted by icemeister. With the sightglass clear and the box temperature near design, set the evaporator superheat to about 4-6 Deg F. If the superheat at the compressor is above 20 Deg F, then you're in good shape. If you're below 20 Deg F, then adjust the evaporator SH as needed to get it above 20 Deg F.suction pressure and discharge pressure in freezer - temperature and refrigerator+ temperatureOriginal equipment manufacturers (OEMs) have since switched to Freon™ 23. Both new and retrofitted existing systems can use this hydrofluorocarbon (HFC), which works as retrofit refrigerant for medical freezers and environmental chambers applications requiring very low temperatures (VLT)—below -40 to -73 °C (-40 to -100 °F). Freon™ 95 ...Currently: 30psig suction/55 superheat (47 if I check at evap) 330 psig head/50 subcool, sight glass clear. Outdoor ambient: 62. Freezer temp: 34 (working its way down) TD 5 degrees. I do have a significant layer of frost on the 3 dist tubes coming off of TXV.

I'm doing that right now on an old 3 door freezer that was R-12. The original compressor was a 3/4 HP. What I'm doing is replacing the complete condensing unit with 1 HP 404a that has a receiver. also getting rid of the cap tube. Replacing it with a TXV and a sight glass. Then I'll adjust the superheat as required.Mar 20, 2019 · R-404A rose to prominence in the late 1990’s with the phasing out of CFC and HCFC refrigerants like R-12 and R-502. There had to be a replacement for the Ozone damaging refrigerants of the past and the successor was the HFC R-404A that we all know of today. 404A’s reign however was short lived.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 ...Correct 404a pressure ensures that your ice maker operates at peak efficiency, translating to lower energy bills and a longer lifespan for your machine. Incorrect pressures, on the other hand, can lead to a myriad of issues, including reduced ice production and increased wear on the system. Think of your ice maker as a living, breathing entity.In this video, I will troubleshoot a freezer that will not get below 25F and go over the R404A PT chart, refrigeration cycle and troubleshooting charts to fi...Refrigerant R-404a, also known as HP-62 and FX-70. One 28 oz. Disposable can. Alternate for R502. This kit is for Recharging a Refrigerant R-404a system. Refrigerant R404a is used on coolers and freezers. This recharge kit includes; (1) 28 oz. Can of R-404a with a CGA600 Top Connection.Post Likes. Set the control up to open at the pressure equivalent to 90ºF condensing temperature and close at 40 psi above that. For R404A that would be CO at 205 psig (90ºF) and CI at 245 psi. The 20 degree superheat 6 inches from the compressor is a minimum so that overides evap superheat on a short run.Yeah superheat is important. 7-10 degrees Fahrenheit. If there are oil issues, it won't be because of superheat but because of riser size. If the load varies a lot it may need a double riser, but if there is only one system on the lines then a single properly sized riser would do the trick.22 degF – 57 degF = 30 degF Compressor Superheat. Example Freezer: 20 psig, R-404a and 14degF temperatures on the suction pipe. Convert 20 psig to temperature using pressure/temperature chart for R-404a (= -16degF) -16degF – 14degF = 30degF Compressor Superheat. Tech Note: Superheat at the compressor has a direct effect onEmerson recommends 20° superheat at the compressor, measured 6 inches from the compressor suction inlet. 5. Filter-driers must be changed at the time of conversion. This is proper air conditioning/ refrigeration practice. Solid core driers such as Emerson ADK are compatible with R-407H/ R-448A / R-449A / R-452A.12.7 psi. - 20°F. - 28.9°C. 16 psi. What should the high and low side pressures be for 404A? It is necessary to have the temp at 34. When the system is running, the temp in the evap is usually 24 so 32 suction pressure. The liquid line pressure needs to be higher than the outdoor ambient's saturation temp, so it would be at least 257.

Genetron® 404A (HFC-404A) is a non-ozone depleting compound designed to serve as a long-term alternative to Genetron® 502 (CFC-502) and Genetron® 22 (HCFC-22) in low- and medium-temperature commercial refrigeration applications. Applications where Genetron® 404A is a suitable retrofit refrigerant include supermarket freezer cases, reach-in ...

The high-pressure (HP) setting for R404A can vary depending on the specific refrigeration system and its operating conditions but typically falls between 200 and 250 psi. What is the ideal range of subcooling? The ideal range of subcooling for R404A is generally around 10 to 20 degrees Fahrenheit.Mar 27, 2019 ... WALK IN FREEZER SUPERHEAT TOO LOW. HVACR VIDEOS•107K views · 33:14. Go ... Walk In Freezer. September 2019. Refrigeration. Low on refrigerant ...Superheat and Sub-Cooling. Whenever an HVAC technician needs to add refrigerant to a system or adjust the charge the tech needs to know what superheat and/or sub-cooling is to properly ensure the refrigerant charge is correct. It is also important to have a pressure-temperature or PT Chart to properly read the pressures and temperatures.When your fridge isn’t cold but your freezer works, it can be a frustrating experience. Fortunately, there are some steps you can take to troubleshoot and fix the issue. Here’s wha...That depends. The DTC (defrost time clock) might/should have a wire connected to the X pin. The X pin is for getting rid of eXtra defrost time, or for eXiting the defrost cycle.So, if DTC is set for a (1-2-3-4 defrost times a day))45min defrost and the frost is gone after 15min, a sensor sends a signal to the X terminal which terminates the remaining defrost time.superheat control under varying operating conditions such as high and low head pressure, wide load variation and partial load down to 10%. Valves with XB power elements can be applied in ... Tmax R 23 R 404A /R 507 20 1,4 -66°C -100 .. -71 2,4 -11°C35 2,8 -14°C -40 55 75 .. 18 3,8 -7°C 60 75 .. 10 4,1 -48°C 100 .. 511,087. Post Likes. Excessive High Side Pressure On small True 404a Frezer. synopsis R-404a system running high liquid line pressure 310 to 320 psi, no load onfreezer, 0*F case temp. 80*F ambient air in room, 28psi suction 10*F superheat full colum of liquid in sight glass slowly charged till glass cleared, it's 11:30 i may have …When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. Refrigerators should pull down to 35°F in about 20 minutes when located in an ambient of about 75 °F. Explore heat pumps, heat pump reviews, costs, brands, manufacturers, knowledge, questions, visit heatpumpmeta.com.448A) from January 2020. With more than 64% less GWP of R-404A, R-448A will be sold as an ... For the use of commercial freezers and refrigerators, we have been selling R-407H (self- ... *2 Calculation condition: Condensing temp. 40oC, Evaporating temp. -40oC, Subcool temp. 0 K, Superheat temp 20 K, Compressor Efficiency 0.7 Notification from ...

China 1 almont menu.

Jake andrich net worth.

I have a 404A split system walkin with line setts approx 30 ft, I have a box temp of 12 deg F and dropping. System Pressures are 25 PSIG Low side and 175 PSIG High side. 12 inches from Compressor I get a 45 deg F. When adding 404A the low side pressures temp and PSIG drop raising my superheat. Currently my superheat is approx …Jul 13, 2017 ... Charging 404a into system, I used a piece of ... Charging 404a into system, I used a piece of ... WALK IN FREEZER SUPERHEAT TOO LOW. HVACR ...Superheat, and 70% compressor isentropic efficiency (see Table 3). These conditions were selected to closely match the R-404A baseline freezer test runs during the last minute of pull-down. XL40 is shown as having higher capacity than R-404A, while XL20's capacity is slightly lower. Both replacements showed slightly higher efficiencies than R ...May 24, 2023 ... How to charge 404a gas in freezer R404a ka freezer ... 7.9K views · 11 months ago #freezer #refrigerator ... ... WALK IN FREEZER SUPERHEAT TOO LOW.What is the low side pressure of a freezer using R-404A refrigerant? Updated: 9/20/2023. Wiki User. ∙ 12y ago. Best Answer. if room tem is 70f 15psi. Wiki User. ∙ 12y ago.a direct replacement for HCFC-22 (R-22) and R-404A/R-507 in positive displacement, direct expansion, low- and medium-temperature commercial and industrial applications. Opteon™ XP40 can also be used as a replacement for "service" blends, such as Freon™ HP80 (R-402A) and Freon™ 408A. Because R-402A and R-408A contain a significantThe discharge pressure of R407A, R407F, R448A or R449A can be different from R404A and condenser fan and ambient controls may require adjustment. Adjust refrigerant charge. Operate the system. Record the data and compare with the data recorded at step 1. Change TXV and adjust TXV superheat setting if necessary.It is now less than a year until R404A is banned in new commercial refrigeration applications in Europe, and from 2020 onwards, only recycled refrigerants can be used for servicing. As contractors help hotels, restaurants and food production premises to find alternatives, Danfoss is ready with a wide wide range of components for popular …Yeah superheat is important. 7-10 degrees Fahrenheit. If there are oil issues, it won't be because of superheat but because of riser size. If the load varies a lot it may need a double riser, but if there is only one system on the lines then a single properly sized riser would do the trick.Re: R-404A superheat. I personally have not had a problem with R404a, but I have heard of many who have. It is my understanding that the TXV sizing (including the orifice) is somewhat more critical that the older refrigerants, and the pressure drop across the valve is also more critical (constant liquid pressure required) They have been finding ... ….

Freezers [-18°C; -23°C]; 16h MBP: R448A, R449A, LBP: R448A, R449A, R452A New systems MBP: R448A, R449A, R134a, R513A, R290 LBP: R448A, R449A, R452A, R290 Source: Danfoss, example for a medium temperature application operating at -10°C with 35°C condensation temperatures Coolselector®2 Refrigerant Slider Retro˜t guidelines Refrigerants ...Feb 16, 2014 · 1. a) Most walk-in coolers and freezers use a TX valve to regulate the flow of refrigerant into the evaporator. If the superheat is low the TX valve will allow refrigerant to flow into the evaporator at a rate that exceeds the capacity of the evaporator and as a result liquid will enter the suction line.Correct 404a pressure ensures that your ice maker operates at peak efficiency, translating to lower energy bills and a longer lifespan for your machine. Incorrect pressures, on the other hand, can lead to a myriad of issues, including reduced ice production and increased wear on the system. Think of your ice maker as a living, breathing entity.fourthindiana. Apr 5, 2019. In summary, the walk-in freezer at the trade school has refrigerant that is more suitable for having colder evaporators than the refrigerant used in residential air-conditioners. This is likely why the walk-in freezer with R-22 is able to get down to -15F while a residential air-conditioner with R-22 cannot.Generally speaking, a freezer should have 6-8F/3.5-4.5K superheat, a cooler should have 8-10F/4.5-5.5K superheat, and an A/C should have 12-16F/6.5-9K superheat. On the high side the subcooling should be no more than 15F/8.5K because this is the point at which liquid will start to back up into the condenser.Refrigerant R-404a, also known as HP-62 and FX-70. (3) Three 28 oz. Disposable can's. Alternate for R502. This kit is for Recharging a Refrigerant R-404a system. Refrigerant R404a is used on coolers and freezers. This recharge kit includes; (3) 28 oz. Can's of R-404a with a 1/4" male flare fitting on top with internal valve core and brass cap ...From small chest styles to industrial walk-ins, freezers are important appliances for food storage for both home and professional kitchens. But these handy machines can’t do their ...High superheat in the evaporator coil; Low suction and discharge pressures; A compressor that overheats and no longer operates properly (e.g. short cycles on low pressure cut-out or runs continuously); A compressor that has trouble starting or a circuit breaker that keeps tripping. In a properly charged system, the refrigerant is also cooling ...Overall Process: Enter refrigerant, temps, and pressures. The math is done for you; superheat calculations, subcooling calculations, and airflow calculations all display Target, Actual, and Difference. Repeat steps 1-2 until all HVAC Diagnostics check out as "Okay"; send system status report VIA text message or email as needed. Freezer superheat 404a, The Rise of 404A: More Than Just a Refrigerant. When you hear “404A,” think of it as the superstar of the refrigeration world. Known for its unparalleled efficiency and safety, it’s no wonder that 404A has become a staple in Walk In Coolers and Freezers across the globe. But, like every star, it has its unique traits and quirks. 1, Bohn ADT156AK Evaporator Coil (15,600 BTU 10*F TD/25*SST) 2,100 CFM. Sporlan SBFSE-B-C Balance Port 404A Expansion Valve (1-1/4 - 2 Tons) with Sporlan R-404A Distributor Nozzle and Ring installed in distributor. Followed Sporlan Bulletin 90-30-1 Head Pressure Control Charging Recommendations. Walk-In-Cooler Temperature - 40*F., Optimal walk-in cooler pressures are crucial for maintaining the desired temperature and ensuring the longevity of stored products. While the exact pressures can depend on various factors, generally, for R404a refrigerant, suction pressure should be approximately 60-70 psi and discharge pressure around 225-250 psi., According to the R-22 PT chart, this is equal to about 54°F. With the thermometer, we measured the saturated R-22 temperature of 45°F. Here is how we can calculate the R-22 superheat in this system: Superheat (R-22) = 54°F – 45°F = 9°F. The superheat calculator also gives us 9°F superheat for R-22 refrigerant., A freezer that requires manual defrosting should be defrosted any time it accumulates one half-inch of ice on any part of the interior, but some freezers are self-defrosting and do..., Re: Charging 404A into a new walk-in freezer. I manually hold in the button in the contactor. In the 220V control circuit is a high pressure switch (N Closed), low pressure (N Open), Time delay relay (N Open) in series with CR1: the compressor contactor. With only 1/2 of the 404A Charged then the low pressure switch would stay open - I guess., About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., Superheat adjustment rely on the thermostac expansion valve to control the amount of superheat of the suction exiting the evaporator coil. Building a Walkin Cooler Walk in freezer, Walkin cooler . Take a dry bulb temperature of the outdoor ambient air. How to check superheat on a walk in cooler. I am not sure what you are saying about the drier ..., AVA2510ZXTXC (Which is a 10K btuh low temp Tecumseh running 404a. It sounds like you have a liquid line restriction. At a 15 lb suction pressure, and 220 head, you should be refrigerating like crazy, BUT; You have FLASHGAS at your TXV, which is why it's hissing and only feeding one pass. If there is a sightglass, it should be 100% clear., As of 2015, ApplianceXChange.com lists used freezers ranging from as low as $50 up to several hundred dollars and more. The value of a used freezer depends upon its size, age, cond..., Refrigerators/Chest Freezers · Water Coolers · Specialty · My Account · Industrial Refrigeration · Process Chillers · Pressurized-Air Drye..., Re: 404a freezer. Assuming you have fitted a TEV and not a TV. Firstly check your superheat across the coil. This will confirm a starved coil so then check your valve it may be partially discharged or filter blocked.Also the external connection should really be after the bulb. 06-08-2010, 08:22 PM #10., 404a superheat subcooling refrigeration temperatureR 404a pt chart Refrigerant r-404a pressure / temperature chart free downloadTemperature 404a refrigerant refrigeration. ... T 35 f freezer 404a not freezing - Page 2 Check Details 134a Pressure Temperature Chart Pictures to Pin on Pinterest - PinsDaddy, In mid-size installations such as cold rooms, milk tanks, display cabinets, and blast freezers, there are several options which relate to Article 12 of the EU F-gas regulations. The best choice will depend on the type of application. For further information, please refer to question 1., What is superheat and subcooling in the context of a 404a walkin freezer? A: Superheat refers to the number of degrees a vapor is above its boiling point at a particular pressure. In a 404a Walk In Freezer, it indicates the heat that is absorbed after the refrigerant (r-404a) has all evaporated into a gas, known as high superheat., Adjust and optimize superheat in less than 15 minutes. TXV Superheat Tuner is now part of Ref Tools, the essential, all-in-one mobile app for air conditioning and refrigeration technicians. Ref Tools gives you access to the tools, guidance, support, and information you need—on the job and in the field., 404R pressure temperature chart is quite simple to understand. This is a table that tells you precisely what the pressure of R404A is at a certain temperature. At the low end, the pressure of 404A is 0.9 psig. At the high end, the pressure of 404A is 456.8 psig. We are, of course, talking about 404A liquid pressure., Actual Line Temp - Sat Temp = Total Superheat. 55°F - 37°F = 18°F. 18°F of Total Superheat > 9°F Target Superheat = Undercharged. Since the actual total superheat measured is higher than the target superheat, we would need to add refrigerant a little at a time until the superheat is the same as the target superheat., First time using and installing a freezer split system with 404A. Can some one tell me LP,HP settings. ... as far as superheat and subcooling, where do I take my temps? Reply . 09-13-2016, 05:35 PM #20. pecmsg. View Profile View Forum Posts View Forum Threads ..., About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., R404A. R404A is a blend of R125 / R143a / R134a with mass percentages of 44% / 52% / 4% having a molar mass of 97.60 kJ/kg. Although this fluid is a mixture, its properties are well-represented by the equation of state developed by Lemmon, as described in: E. Lemmon. "Pseudo-Pure Fluid Equations of State for the Refrigerant Blends R-410A, R ..., Feb 24, 2010 · Nov 2003. Location. South Carolina. Posts. 1,167. Post Likes. 404A Walk-Cooler. You guys will have to excuse the ignorance of basically an HVAC guy who has been thrust into the position of doing a good bit of reefer work. I have a 404 walk in cooler where the temp is hovering slighlty above 50 degrees box temp., Got a true t35 freezer that won't get cold. Low 20.6 psig 58.5 sh -13.8vstat high is 225 psig 1.1sc 96.6lsat oddb 80... cleaned it. ... T 35 f freezer 404a not freezing; Cookie Consent We use cookies to improve your website experience. ... Down near the compressor would be more of a compressor superheat reading. Take your suction pressure ..., Condensing Unit. 1-1⁄2 HP R-22 condensing unit / evaporator assembly. Horizontal line-set sloped down from evaporator compressor. Optimized refrigerant charge / adjusted TXV superheat setting. Ran R-422D, R-427A, and R-438A with MO & POE (camera) 100°F Ambient / 0, 25, & 50°F Box Temps - "Dry Coil" tests., This will enable superheat, subcooling and pressure ratio to be determined and provide the base data for comparison when the system is put back into operation with the R407A, R407F, R448A or R449A. 2. Disconnect electrical power to system. 3. Properly remove the R404A/R507 from the system. The refrigerant charge should be isolated from the system, 22 degF - 57 degF = 30 degF Compressor Superheat. Example Freezer: 20 psig, R-404a and 14degF temperatures on the suction pipe. Convert 20 psig to temperature using pressure/temperature chart for R-404a (= -16degF) -16degF - 14degF = 30degF Compressor Superheat. Tech Note: Superheat at the compressor has a direct effect on, -25 is pretty cold, but if they are trying to freeze it fast that’s deff a good way. Usually ice cream is kept at -8 or colder I’ve seen up to -18/-20. Superheat for any freezer you should shoot for 4-10 at evap, at compressor I would say atleast 15 preferably 20 but if you have a short run you won’t achieve that., Jan 28, 2021 ... From https://www.justanswer.com/ythi JustAnswer Customer: What is the normal suction pressure on a 404a walk in freezer?, The discharge pressure of R407A, R407F, R448A or R449A can be different from R404A and condenser fan and ambient controls may require adjustment. Adjust refrigerant charge. Operate the system. Record the data and compare with the data recorded at step 1. Change TXV and adjust TXV superheat setting if necessary., Overall Process: Enter refrigerant, temps, and pressures. The math is done for you; superheat calculations, subcooling calculations, and airflow calculations all display Target, Actual, and Difference. Repeat steps 1-2 until all HVAC Diagnostics check out as "Okay"; send system status report VIA text message or email as needed., Emerson recommends a minimum of 20F (11C) superheat, measured on the suction line 6 inches (152mm) from the suction valve, to prevent liquid refrigerant floodback. See AE4-1298 for more information., A step by step troubleshooting ice built up on evaporator and adding refrigerant is hereby detailed here and adjusting defrost settings of dixell digital con..., How to calculate superheat 404a? There are two types of superheat in the refrigeration system. Total Superheat with R404a = Corresponding temperature at suction pressure – Temperature measured at a suction line or outlet of the evaporator. The refrigeration system can be analyzed with evaporator superheat, and the compressor superheat.