2024 Negative subcooling

At a high level, superheat occurs when you heat vapor above its boiling point. Subcooling occurs when you cool a vapor below the temperature at which it turns into a liquid. But let’s dive in deeper, starting with superheat. Boiling is when a liquid gains heat and transforms into a vapor. Remember, superheat occurs when you heat vapor above .... Mrbeast follower count

Mar 30, 2010 · 2 Post Likes Causes of Negative Subcooling First of all, is it possible to have negative subcooling (ie liquid line temp is greater than temp of condensation)? Second, what could cause this to happen? Reply 03-30-2010, 07:59 PM #2 INTECHBILL Professional Member Join Date Subcooling. The term subcooling applies only to solids and liquids and refers …Dec 1, 2018 · This unusual instance of CHF dependence on subcooling was simulated in their CHF model by incorporating the negative influence of subcooling on local mass flow rate along the heater surface. Specifically, a term representing single-phase heat transfer to the subcooled liquid was added in calculation of the vapor mass flow rate. can have negative subcooling Reply . 10-02-2021, 12:53 AM #2. R600a. View Profile View Forum Posts View Forum Threads Professional Member*/Membership Committee Join Date Jul 2019 Location Hanging out with the mice behind the fridge talking bad about the roaches in the oven. Posts 30,796 Post Likes Likes (Given) 49015 Likes …Inadequate subcooling: Subcooling refers to the process of cooling the liquid refrigerant below its saturation temperature. If there is inadequate subcooling, it can result in high superheat.This can occur due to issues such as a malfunctioning condenser coil, improper refrigerant flow, or insufficient cooling of the liquid refrigerant.. By understanding the …Negative Subcooling The act of subcooling generally generates positive values. For instance, cooling water from 212 to 211 degrees Fahrenheit involves a subcooling value of positive 1. However, HVAC systems sometimes post negative subcooling values, which indicate a move in the opposite direction of standard subcooling, or a raise in temperature.It's just a matter of using the correct terms. If your condensing temp is 100 degrees and your liquid line temp is 105 degrees that is "superheat", not "negative …14 Jan 2020 ... What is Superheat and Subcooling, and how do you measure it? Plus troubleshooting tips.9 superheat & subcooling scenarios. LOW CHARGE = High superheat. Low suction pressure, indoor TD, subcooling, head pressure & compressor current draw. OVER CHARGE = Low superheat. Normal indoor TD. High suction pressure, subcooling, head pressure & compressor current draw. LOW INDOOR AIR FLOW = Low superheat & …(You can learn more about subcooling and the ‘stacking' effect in this video HERE.) This ‘stacking’ effect, as it’s commonly called, allows more time for the liquid to be in the condenser and reject heat. …: Weak and negative effect of subcooling on CHF CHF data of own show weak or adverse effects in subcooling ranging 5~15K 15 1. Subcooling effect on CHF seems to be nonlinear and complex under certain condition (e.g. ex-vessel core catcher) 2. For improvement, interrelationship between subcooling and buoyancy induced flow motion should be …Subcooling = 100°F – 92°F = 8°F. The calculation itself is the easy part. The harder part is how to measure the needed refrigerant temperatures for superheat and subcooling calculation. We use an HVAC manifold gauge and a clamp-on thermometer for all superheat and subcooling measurements.When the equilibrium quality is negative, this negative value is used except the homogeneous friction fac tor multiplier, where x = о , is substituted, so it is ...The examination of the effects of varying the degree of subcooling at the condenser on the COPs of three heat pump systems, which was carried out for a constant condenser pressure of 1000 kPa and considering a range for the degree of subcooling of 0–20°C, showed that the COPs increase linearly with the degree of subcooling. •. and the reason your seeing Negative subcooling is because your downstream of the metering device. There is now High-pressure liquid in the suction side. You cannot have negative subcooling or superheat! Last edited by pecmsg; 12-27-2021 at 08:19 AM. R I P Icemeister ...This HVAC Video is- What Exactly are Superheat and Subcooling and How do you use each of them for Charging Air Conditioners to Check the Level of Refrigerant...4,880 Post Likes Either way it still would not be negative sub-cooling. A Diamond is just a piece of coal, that made good under pressure! Reply 03-31-2010, 08:02 AM #22 jpsmith1cm Professional MemberThe Refrigeration Cycle – Complete: In this final diagram of the refrigeration cycle we have introduced 3 new terms: Superheated, Saturated & subcooled. SUPERHEAT – Is an amount of heat added to refrigerant vapour beyond its boiling point. This ensures the refrigerant is in a gas state with no liquid present.Since the liquid line holds compressed refrigerant at high pressure, a pressure/temperature chart would indicates that it should be at a much warmer temperature than the much lower pressure gas in the suction line. If at First You Don't Succeed, Skydiving Is Not for You. Reply. 12-27-2021, 07:43 AM #10. MJHC.A theoretical study about effect of condenser subcooling on the performance of vapor-compression systems has been presented. This study showed that, as condenser subcooling increases, the COP undergoes a maximum as a result of a trade-off between increasing refrigerating effect, due to the reduction of the condenser exit temperature, and ...A Negative subcool number is not a thing. This is why your app is confused and displaying “ 0°” instead of the -2° that you are actually measuring. 0 is the lowest amount you can subcool a refrigerant. -1° subcool would actually be 1° superheat. Proper subcooling will only be achieved when the load is w/in 10 to 5 degrees of setpoint and only at that point. You should also be checking the superheat at this time. So yes you can charge by subcooling alone. A properly charged system will have btwn 10 and 15 degrees subcooling no matter what the OAT is.Jan 22, 2015 · I attended a copeland seminar and puzzled by the statement that a higher subcooled liquid has more capacity then 10 degree subcooling liquid. I realize that heat is absorbed more readily when liquid changes state to gas (latent heat) rather then heat used to raise liquid temperature (sensible heat), it won't absorb as much heat. Jun 22, 2022 · It is one of a few possibilities: You are looking at the wrong refrigerant PT scale. The refrigerant is mixed (somebody added another refrigerant on top of the original refrigerant). You are dealing with a blended refrigerant with “glide,” like many of the new 4-series blends, such as R-407c. Your suction gauge is reading too high. High subcooling shows that the condensing point is occuring earlier in the condenser while low subcooling shows that the condensing point is later in the condenser. Subcooling is used to charge systems with a TXV. Now you can see why knowing what, and why, superheat and subcooling are essential to proper diagnostics and troubleshooting.For the subcooling target of 70 K LO 2, the simultaneous subcooling scheme with a two-stage subcooling unit is recommended, including an atmospheric and a subatmospheric LN 2 bath heat exchangers. The negative pressure in the second-stage LN 2 bath was achieved through a water-ring vacuum pump, which was successfully verified …Negative subcooling doesn't really exist, if there is zero subcooling, we are either superheated or at saturation (boiling) depending on the amount of heat absorbed. Conversely, negative superheat ...Subcooling is the measure of the amount of refrigerant in the condenser unit. Suppose you want to determine superheat at the suction line, and you get a value that is higher than 10 (remember we said normal superheat at the suction is within 10 F) that means you have low refrigerant. ... To rule out a bad metering device, we need to …Re: Taking vrv superheat and subcooling temperatures. On Daikin VRV you can check on the local controller -Controller Sensor/Air On Sensor/Liquid Pipe inlet Sensor/gas pipe Sensor. You can then measure superheats from there. As Mulitsync says the best idea is to get a service checker. 09-10-2010, 11:32 PM #15.The advantages and disadvantages of supercooling in nature and different daily applications are reviewed. ... subcooling or undercooling. During supercooling, the material is in metastable state and plenty of factors can trigger solidification. The initiation of solidification results in the release of the latent heat, which causes a ...The examination of the effects of varying the degree of subcooling at the condenser on the COPs of three heat pump systems, which was carried out for a constant condenser pressure of 1000 kPa and considering a range for the degree of subcooling of 0–20°C, showed that the COPs increase linearly with the degree of subcooling. •. Aug 6, 2020 · Gas Furnace Electrical Safety Switch Testing! 04/21/2021. HVAC DELTA T (ΔT) Explained for Air Conditioners! 03/25/2020. HVAC Electrical Training Board For Wiring, Components, Wiring Diagrams, Troubleshooting. 06/01/2021. Heat Pump Pressure Switches. 04/05/2019. How NOT to Check the Refrigerant Charge! Subcooling is great but there are circumstances where it can lead you to make a grave charging error. Here is where and why a sight glass is more than a toyThe definition of subcooling release degree is given. ... One reason is that the local tensile stress in the liquid forms negative pressure. The reduction of pressure makes the gas originally dissolved in the liquid supersaturated, and then escape from the liquid to become small bubbles. Another reason is that the strong tensile stress “tears ...June 29, 2022 by World Wide FAQS. Perhaps the most common cause of insufficient subcooling is an abnormally low refrigerant charge. Lack of refrigerant usually means that your system suffers from one or more leaks. Attending to the leaks and then increasing the system’s refrigerant charge should restore proper subcooling.Measuring Negative Superheat on an Air Conditioner? (Quick Tips) 05/01/2020. Measuring a Liquid Line Restriction Problem! ... In this article, we will define subcooling, calculate subcooling, explain how to use subcooling to check the refrigerant charge, and show... 113,257 views. 15 likes. Post not marked as liked 15. Apr 19, 2019;The increase in temperature above saturation is described as the refrigerant’s superheat value. For example, at 18.42 psig, R-134a has a saturation temperature of 20°F. If its measured temperature is 30°F, the refrigerant is said to be superheated by 10°F. One useful area to measure the refrigerant’s superheated value is at the exit of ...The term subcooling is usually atributed to a hotwell condition where the condensate in the hotwell is colder than the saturation temperature corresponding to the actual back pressure of the exhaust. What you are talking about is quality, or moisture, which is not subcooling, rather a specific condition of steam for that given temperature and ...Subcooling is an accurate measure of the amount of time it takes for the refrigerant to pass through the condenser. This is referred to as "stay time." The proper amount of subcooling for any specific unit may vary with its application and type of system.Negative Subcooling. The act of subcooling generally generates positive values. For instance, cooling water from 212 to 211 degrees Fahrenheit involves a subcooling value of positive 1. However, HVAC systems sometimes post negative subcooling values, which indicate a move in the opposite direction of standard …Subcooling 29,87- 30,8= -1,07K Negative subcooling (impossible) 09-03-2012, 11:07 AM #12. nike123. View Profile View Forum Posts View Blog Entries Visit Homepage ...This unusual instance of CHF dependence on subcooling was simulated in their CHF model by incorporating the negative influence of subcooling on local mass flow rate along the heater surface. Specifically, a term representing single-phase heat transfer to the subcooled liquid was added in calculation of the vapor mass flow rate.The effect of wall subcooling on heat transfer coefficient. The F ( W a , p ) based on the revised wall subcooling, when p = 0.6 MPa W a = 0.74. Condensation heat transfer coefficient curve as a ...negative influence of subcooling on local mass flow rate along the heater surface. Specifically, a term representing single-phase heat transfer to the subcooled liquid was added in calculation of the vapor mass flow rate. Their CHF model could successfully predict the anomalous dependence of subcooling on the CHF observed in their experiments.SUBCOOLING. 21-05-2008, 09:06 PM. has anyone had any experience with york split systems?:) SUBCOOLING. 21-05-2008, 10:43 PM. good or bad. SUBCOOLING. ... thanx for taking time out grizzly atleast not as bad responce asif the question was about LG. Grizzly. 22-05-2008, 12:01 AM. Probably because LG are more common. Who knows?It is one of a few possibilities: You are looking at the wrong refrigerant PT scale. The refrigerant is mixed (somebody added another refrigerant on top of the original refrigerant). You are dealing with a blended refrigerant with "glide," like many of the new 4-series blends, such as R-407c. Your suction gauge is reading too high.Boil-off Gas (BOG) generated at the liquefied natural gas (LNG) export terminal causes negative economic and environmental impacts. Thus, the objective of this study is to develop and evaluate ...In general, it is gotten that the suction density of compressor becomes higher under the subcooling. This trend makes the negative value of ρ nsub / ρ-1 so that the RICOSP exceeds to 1, the cooling capacity of main cycle increases by 6.1 kW with 3.4 kW subcooling power. This means that the conversion of cooling output by the subcooled …With 0.4 wt% in ethylene glycol water solution, the thermal conductivity increases by 7%, subcooling is reduced by 76%, and reduced the latent heat by 12%. Good dispersion stability achieved. [112] MultiwalledCarbon Nanotubes(MWCNT) Increased the thermal conductivity by 10.72% and reduced the subcooling by 86.9% when …Hasanein et al. (1996) investigated the condensation inside a vertical tube and developed an empirical correlation which indicated wall sub-cooling played a negative role on condensation. Liu et al. (2000) conducted a set of condensation experiments outside a vertical tube while the water inside the tube was boiling. Based on his experimental ...SUBCOOLING 101: John Tomczyk, author and professor emeritus, Ferris State University, Big Rapids, Michigan, describes subcooling as the difference between the measured liquid temperature …Gauge Low Pressure Side: 82 PSI ~22°F, Suction Line 81°F - so SuperHeat of 59°F Gauge High Pressure Side: 215PSI ~72°F, Liquid Line 80°F - so I guess that is a negative Subcooling: - 8°F Is it possible that the system has a slow leak? I know we had it leak tested a few years back because it had lost some refrigerant; however, the leak was ...Figure 9.4 shows the sub-cooling during a freezing experiment with a eutectic solution made from an inorganic salt. The reason for sub-cooling is either the rate of nucleation or the rate of growth of the nuclei (or both) is slow (Dincer and Rosen, 2002 ). Sub-cooling will reduce the usability of PCMs, and can also completely prevent heat ... Feb 23, 2006 · The term subcooling is usually atributed to a hotwell condition where the condensate in the hotwell is colder than the saturation temperature corresponding to the actual back pressure of the exhaust. What you are talking about is quality, or moisture, which is not subcooling, rather a specific condition of steam for that given temperature and ... How to use superheat and subcooling measurements to diagnose what’s happening inside the refrigeration circuit.Superheat is the number of degrees a vapor is above its boiling point at a specific pressure. Subcooling, on the other hand, is the number of degrees a liquid is below its freezing point at a specific pressure. By keeping track of both superheat and subcooling, technicians can more easily diagnose problems with an HVAC system.It is one of a few possibilities: You are looking at the wrong refrigerant PT scale. The refrigerant is mixed (somebody added another refrigerant on top of the original refrigerant). You are dealing with a blended refrigerant with "glide," like many of the new 4-series blends, such as R-407c. Your suction gauge is reading too high.As the other cases, the condenser and reboiler duty has decreased to zero after retrofitting. The ideal and actual enthalpy deficit curves in Fig. 5a are closer in the retrofitted design compared with that of the base case design and the other two designs. The exergy loss profile shown in Fig. 5b shows the reduction in exergy loss at every stage. The retrofits …Since the measured liquid temperature is 98.2*F the refrigerant is in fact slightly subcooled; about 3.5 degrees. Subcool and superheat values are always positive. Liquid refrigerant can't exist in a negatively subcooled state (it would all be vapor, and superheated by an amount equal to the "negative subcooling"), nor can gaseous …Aug 18, 2020 · In instances when HVAC systems have negative subcooling values, it is an indication that there will be a move opposite of standard subcooling (or an increase in temperature). In a nutshell, when a cooling system superheats refrigerant instead of cooling it, the result is the negative subcooling value. The Refrigeration Cycle – Complete: In this final diagram of the refrigeration cycle we have introduced 3 new terms: Superheated, Saturated & subcooled. SUPERHEAT – Is an amount of heat added to refrigerant vapour beyond its boiling point. This ensures the refrigerant is in a gas state with no liquid present.A negative minus a negative is equal to another negative number, a positive number or zero, depending upon the numbers in the equation. Subtracting a negative number from another negative number is the same thing as adding a positive number...What are some negative factors to consider when restricting the outdoor ... subcooling methods can be used for quick ... when the system does not seem ...Subcooling is an accurate measure of the amount of time it takes for the refrigerant to pass through the condenser. This is referred to as "stay time." The proper amount of subcooling for any specific unit may vary with its application and type of system.• DO NOT OPERATE UNIT IN A VACUUM OR AT NEGATIVE PRESSURE. FAILURE TO FOLLOW ... Note: Subcooling information is valid only while "cha" and current subcool-.Subcooling is defined as the difference between the measured liquid temperature and the liquid saturation temperature at a given pressure. Total liquid subcooling occurs from the start of the 100% saturated liquid point in the condenser to the metering device. The saturated liquid temperature can be obtained from a pressure/temperature ...Many manufacturers recommend a subcooling range of 10° – 15°F, but always refer to manufacturer instructions to be sure. Just as there are two kinds of superheat, there are also two kinds of subcooling. They are condenser subcooling and total subcooling. We usually measure subcooling at the liquid line service valve.I attended a copeland seminar and puzzled by the statement that a higher subcooled liquid has more capacity then 10 degree subcooling liquid. I realize that heat is absorbed more readily when liquid changes state to gas (latent heat) rather then heat used to raise liquid temperature (sensible heat), it won't absorb as much heat. Ideally, I …Boil-off Gas (BOG) generated at the liquefied natural gas (LNG) export terminal causes negative economic and environmental impacts. Thus, the objective of this study is to develop and evaluate ...This unusual instance of CHF dependence on subcooling was simulated in their CHF model by incorporating the negative influence of subcooling on local mass flow rate along the heater surface. Specifically, a term representing single-phase heat transfer to the subcooled liquid was added in calculation of the vapor mass flow rate.To understand what negative subcooling means, you must first understand subcooling as well as superheat. In general, the terms “subcooling”and “superheat” relate to the manner in which cooling systems take advantage of the properties in air conditioning refrigerant. Refrigerant makes the creation of cool … See moreRe: Taking vrv superheat and subcooling temperatures. On Daikin VRV you can check on the local controller -Controller Sensor/Air On Sensor/Liquid Pipe inlet Sensor/gas pipe Sensor. You can then measure superheats from there. As Mulitsync says the best idea is to get a service checker. 09-10-2010, 11:32 PM #15.It is evaluated that the second derivative of the corresponding ‘radius’ R of the vapor bubble is negative when the instability appears on the bubble surface, where R = 3 √ 3V/4π. We also illustrate that the wave number of the instability on the liquid-vapor interface increases as the degree of subcooling. Download to read the full ...Superheat is the number of degrees a vapor is above its boiling point at a specific pressure. Subcooling, on the other hand, is the number of degrees a liquid is below its freezing point at a specific pressure. By keeping track of both superheat and subcooling, technicians can more easily diagnose problems with an HVAC system.Bryan demonstrates a in-depth tutorial on how to set a refrigerant charge by Subcool.Read all the tech tips, take the quizzes and find our handy calculators ...Jul 26, 2021 · Subcooling is defined as the difference between the measured liquid temperature and the liquid saturation temperature at a given pressure. Total liquid subcooling occurs from the start of the 100% saturated liquid point in the condenser to the metering device. The saturated liquid temperature can be obtained from a pressure/temperature ... After starting up the AC system and letting it run for 20 minutes the subcooling was 3.5 degrees Fahrenheit and the superheat was around 0.6 degrees Fahrenheit. Now from what I know a low subcooling means that it is low on charge but having almost no superheat means that the evaporator is flooded which normally …Ways to view old negatives include the use of a scanner to turn them into digital files and taking backlit photographs of them with a digital camera, which also turns them into digital files. A user gets better results with a scanner, but p...Negative Subcooling isn't possible if the liquid line temperature and pressure are taken at the same point. HOWEVER, it is possible to have a miscalibration of your tools that makes zero subcooling look like negative subcooling.Bryan demonstrates a in-depth tutorial on how to set a refrigerant charge by Subcool.Read all the tech tips, take the quizzes and find our handy calculators ... Mitsubishi city multi j model. I am new to using this site so I hope I am posting on the correct forum. I am working on a city multi system that really has me scratching my head. This is a pury144yjmu-a with about 28 pkfyp06-08 nbmu's. There is also a MBC and a SBC on they system all using MA controllers.Negative Subcooling. In most cases, negative subcooling is a reading that only occurs when your tools are not working correctly. Miscalibration can make your tools give a negative reading when it is actually zero subcooling. Zero Subcooling. With zero subcooling, there is a combination of liquid and vapor within the system.Can I measure a Negative Subcooling When Checking the Charge? (Quick Tip) 06/29/2020. Can you Braze Mini-Split systems instead of Flaring them? 09/12/2019. Charging a System in a Dry Climate? Consider a TXV and Accumulator! 06/11/2020. Checking the Charge of Air Conditioners without Measuring Pressure!How to use superheat and subcooling measurements to diagnose what’s happening inside the refrigeration circuit. Search; Topics. COVID-19 Contracting Business Success Residential HVAC Commercial HVAC IAQ & Ventilation Refrigeration Service Technology Manufacturer News Book Reviews Around the Web Association News.Step 3. Subtract the evaporator saturation temperature from the thermocouple temperature. This difference is the system superheat. This shows the temperature rise above the bubble point temperature of the system. Review the operating specifications for your system to determine the proper superheat. Inadequate superheat can cause liquid ... June 29, 2022 by World Wide FAQS. Perhaps the most common cause of insufficient subcooling is an abnormally low refrigerant charge. Lack of refrigerant usually means that your system suffers from one or more leaks. Attending to the leaks and then increasing the system’s refrigerant charge should restore proper subcooling.Blends like R410a or 404a must be added to a system as a liquid.Pure refrigerants like R22 can be added in liquid or vapor states. If adding liquid into the suction like, throttle it in slowly to avoid slugging the compressor or diluting and washing out the compressor oil.. Then, What is the formula for subcooling? Refrigerant liquid is considered subcooled when its …Nah, switch the clamps. You have ~ 60 degree superheat and 0 subcooling. LOW ON CHARGE. Its a roof top unit. I cleaned and checked everything. I just cant decide how to proceed. I think its either low refregerent or restriction in the lines or bad conpressor. The subcooling would be low then.Jan 11, 2004 · Steam at 213 degrees F is superheated by 1 degree F. Superheat is then any temperature of a gas above the boiling point for that liquid. When a refrigerant liquid boils at a low temperature of 40 degrees in a cooling coil and then the refrigerant gas increases in temperature, superheat has been added. If this refrigerant changed from a liquid ... It can be found that the presence of the air increased the influence of the wall subcooling on the condensation heat transfer coefficient. Meanwhile, compared with the condensation under high wall subcooling, the effect of the wall subcooling on the condensation heat transfer coefficient under low wall subcooling is less significant. 3.1.2.

To calculate the superheat, subtract the saturation temperature from the measured refrigerant temperature: Superheat = 45°C – 10°C = 35°C. In this example, the superheat value is 35°C, indicating that the refrigerant is 35 degrees above its saturation temperature at the given pressure.. Polylute vs ukulele

Negative subcooling doesn't really exist, if there is zero subcooling, we are either… Liked by Johnstone Supply ~ The Comunale Group. A service department can address on-demand calls that much ...An R-22 evaporator running at 40F saturation temperature will have a corresponding pressure of 68.5 psig. Should the suction pressure drop below 57 psig, the coil temperature will drop below 32F causing moisture in the air to freeze on it (see Figure 4) causing no end of trouble. A R-410A evaporator running below 100 psig will freeze-up just ...Use subcooling as the primary method for final system charging of long line set system application. Extra refrigerant needed = (Linear feet of line set – 15 ft) x X oz/ft. Where X = 0.67 for 3/8” liquid line and 3/4 suction line.The pressure needle intersects at 100°F saturated temperature for R-410A. Therefore, the saturated temperature inside the condenser coil is 100°F. Below is the example: Calculate the subcooling based on the picture: Sat Temp - Actual Line Temp= Subcooling. 100°F - 95°F = 5°F of Subcooling.Negative reinforcement is a behavior management strategy, such as allowing playtime when they follow rules, that parents and teachers can use with children. Negative reinforcement is a learning method that reinforces desired behaviors inste...It's been some time since we last published a new article on these important HVAC system measurements. David Richardson provides a fresh review of the procedures.Inadequate subcooling: Subcooling refers to the process of cooling the liquid refrigerant below its saturation temperature. If there is inadequate subcooling, it can result in high superheat.This can occur due to issues such as a malfunctioning condenser coil, improper refrigerant flow, or insufficient cooling of the liquid refrigerant.. By understanding the …It's been some time since we last published a new article on these important HVAC system measurements. David Richardson provides a fresh review of the procedures. Subcooling is an accurate measure of the amount of time it takes for the refrigerant to pass through the condenser. This is referred to as “stay time.” The proper …Subcooling is defined as the difference between condensing pressure/temperature and liquid temperature at the expansion valve inlet. Subcooling of the refrigerant is necessary to avoid vapour bubbles in the refrigerant ahead of the expansion valve. Vapour bubbles in the refrigerant reduce capacity in the expansion valve and thereby reduce ...Jul 23, 2011 · The lack of Subcooling could indicate an under charge. If the latent load is normal or low that could point to a low charge. At an outdoor 98F & mid-range indoor humidity the superheat target is 5F; U had 15F, too high - low charge. Is that a single speed condenser fan motor? Is the fan motor delivering the Rated condenser CFM? .

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