Your blood pressure readings are useful indicators of your cardiovascular system’s overall health. Low, high and normal blood pressure readings help your doctor make the right deci...The compressor is still cooling, but not to its rated capacity, which can cause refrigerated products to spoil faster and frozen products to begin to thaw. There are three main reasons why a compressor will simultaneously have a low head pressure and a high suction pressure: 1. Bad (leaky) compressor valves; 2. Worn compressor rings; and.Wakra is a beautiful coastal city in Qatar that is known for its stunning beaches and crystal-clear waters. For beach enthusiasts, one important factor to consider before heading o...Both fans working fine. Good air flow through evaporator and condenser. There are no leaks, and no icing. I have tried adjusting the charge to raise the low side pressure, but in doing so would also raise the high side exponentially. (i.e. Increase the suction pressure by 20 psi, and the head pressure would jump as much as 150 psi)A patient with low blood pressure, or hypotension, should see a doctor if he experiences dizziness, fainting, irregular heartbeat, breathlessness or chest pain, according to Medlin...We would like to show you a description here but the site won’t allow us.It is possible to ensure that cavitation is avoided during pump operation by monitoring the net positive suction head of the pump. Net positive suction head for a pump is the difference between the suction pressure and the saturation pressure of the fluid being pumped. NPSH is used to measure how close a fluid is to saturated conditions ...High suction low head, with 100 lb suc and 100 degree ambient your head should be quite a bit higher. Really need the amp draw of comp and rated RLA but appears to be a compressor issue. Im thinking maybe dirty evap i vacuumed rust from drain pain really old unit. I can just about guarantee that thinking is wrong.It's tempting to head to the Caribbean this winter but here's why you might want to avoid the trip -- even to islands with low COVID-19 infection rates. Editor’s note: This post ha...Jun 11, 2021 · High head pressure is typically accompanied by a low suction pressure. This combination can be indicative of restricted refrigerant. Essentially, this means that air and vaporized water travel through your HVAC’s evaporator until they get to the top of the compressor, where it remains because it will not condense. Step 1. Scale in a geothermal heat pump's fluid system results in an overall increase in fluid temperature high head pressure in the cooling mode and low suction pressure in the heating mode an overall decrease in fluid temperature low head pressure in the cooling mode and high suction pressure in the heating mode.Low Load. While we often think of the combo of low suction, superheat, and head pressure as being caused by low airflow, it actually falls under a larger heading of low evaporator load. That simply means that the quantity of heat being picked up in the evaporator is lower than the refrigerant mass flow rate requires for the desired operation.I just wanted to pick every ones brain i could. I am working on trane condensor and have high head pressure and low suction pressure. It was 90+ out today and I dumped r-22 into the system and no matter what I did I could not get the suction line to sweat and the superheat never dropped below about 20 degrees. my head pressure was around 285 ...A bad check valve on an air conditioner, heat pump or similar HVACR equipment can show up as abnormally low or abnormally high suction line pressures, or as abnormally low or high superheat. Experts suggest using an IR heat gun or similar tempeature measuring tool to check the tempeature of the refrigerant line on each side of the valve.Net Positive Suction Head. Net Positive Suction Head or NPSH for pumps can be defined as the difference between the suction pressure and the saturation pressure of the fluid, expressed in terms of height of liquid column. NPSH is used to measure how close a fluid is to saturated conditions. Lowering the pressure at the …The users should set high and low alarms on the EdP output to keep the DP tightly controlled while increasing the flow rate. If the pump doesn’t generate 120 feet total head at the 55 gpm flow rate, this could be your first indication of an operational or mechanical issue. Check the suction pressure and ensure it is greater than NPSHr.HIGH SUCTION PRESSURE / LOW HEAD PRESSURE ISSUE. Hey guys, need some help i am working on a carrier unit with a Scroll Compressor. I am getting 80 PSIG low side and 165 PSIG high side. Liquid Line is also very hot to the touch. I know this is not normal readings and since it's a scroll compressor, I am thinking about replacing the TXV.Significance of Monitoring Head Pressure. Regularly monitoring head pressure is crucial for various reasons: Energy efficiency considerations: A well-regulated system consumes less power. System longevity: Systems with proper head pressure often have longer lifespans. Maintaining comfort levels: Stable head pressure ensures consistent …High Suction Pressure! I have a 3Ton Carrier Heat Pump unit using 410A that has extremely high suction pressure around 250PSI. I also have a low liquid line pressure around 300PSI and my sub-cooling is around 40-50 Degrees. I have checked for a stuck liquid line solenoid but this system does not have one, and I checked the reversing valve and ...If the system suction pressure on a fixed metering device type unit is too high; the potential causes are; C. Flooded Evaporator Coil, High Evaporator Head Load, Dirty Condenser Coils, Compressor Valve Failures. TXV system problems can exhibit the five following symptoms: a. Normal suction pressure & superheat, with low or high …Where H t is the total head, H d is the discharge head and H s is the suction head. Also be aware that this equation holds true whether the suction head is positive (level of liquid in the suction tank is above the pump) or negative (level of the liquid in the suction tank is below the pump). See Figure 4 for an example of the latter situation.Flashcards Study Guide 29 | Quizlet. In a 2-ton capillary tube system, the unit does not develop full capacity. Heat pressure is low and suction pressure is high. What is the problem? Click the card to flip. BLANK. Quizlet has study tools to help you learn anything. Improve your grades and reach your goals with flashcards, practice tests and ...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 ...High Suction Pressure! I have a 3Ton Carrier Heat Pump unit using 410A that has extremely high suction pressure around 250PSI. I also have a low liquid line pressure around 300PSI and my sub-cooling is around 40-50 Degrees. I have checked for a stuck liquid line solenoid but this system does not have one, and I checked the reversing valve and ...Table 1: R134a Saturation Properties pressure table (Reference: www.chemours.com) Back to the problem at hand. For any refrigeration cycle/AC unit there are two operating pressures: suction pressure and discharging pressure, high and low settings for each pressure line determined by the manufacturer will stop the unit.temperature efficiency. 9. The approach temperature for the evaporator is. A. the difference between the suction and head pressures converted to temperature. B. the difference between the refrigerant boiling temperature and the suction-line temperature. C. the difference between the refrigerant boiling temperature and the inlet water temperature.Liposuction is the removal of excess body fat by suction using special surgical equipment. A plastic surgeon typically does the surgery. Liposuction is the removal of excess body f...R-22 Low Side Pressure 2: R-22 High Side Pressure 3 °F 1 °C: psig: kpa: Bar-50° ... Typical low pressure or suction side, may vary by equipment and metering controls - these are "gauge pressure readings" or "psig" Typical high …404a pressures in low. I have a r-404a roof-top condensing serving a walk in freezer. pressures are 235 psi head pressure and a 28psi suction pressure. Outdoor ambient is 30degress and indoor box temperature is about 20degrees. System has a head pressure control on roof for hot gas. Wondering if pressures sound right.Description: HHL-Flomax (High Head Low Flow) "HR" high pressure self-priming centrifugal pumps meet USCG specifications for auxiliary fire control. The high suction centerline and impeller design eliminates premature priming loss while ensuring consistent priming Discharge Size: 1.5 inch; Maximum Discharge Flow: 108 to 180 GPM; Power …Step 1. Scale in a geothermal heat pump's fluid system results in an overall increase in fluid temperature high head pressure in the cooling mode and low suction pressure in the heating mode an overall decrease in fluid temperature low head pressure in the cooling mode and high suction pressure in the heating mode.Design or measured suction pressure for a fan is Ps = -380 mm W.G. (-14 in W.G). The correction factor from table above 1.04. For a proper fan selection the suction pressure should be corrected to. Psc = (-380 mm W.G) 1.04. = -395 (mm W.G.) High suction pressure at a fan inlet decreases the density of air - and should be corrected for proper ...Take the suction pressure and use the pressure/temperature chart to convert it to temperature. Let’s say the suction pressure is 60(Psi) which converts to 34F. And assuming that the suction line temperature is 44F. Then to get superheat we just get the difference between the two temperature readings. In this case, we have 10F of …The high head leads to poor heat rejection and the higher pressures can force more of the available refrigerant into the evaporator and show up as normal or high suction pressure with normal or low superheat. Also make sure the outdoor fan motor is running in the proper direction. Reply.Suction pressure high, head pressure low, superheat low, subcooling low, amp low. I don't see any superheat or subcooling I dont warranty Tinkeritus . Reply . 08-03-2012, 10:35 AM #4. michigan1. View Profile View Forum Posts View Forum Threads Professional Member Join Date Mar 2003 Location austin Posts 451 ...NPSHA = Ha +/- Hz - Hf + Hv - Hvp. Where: Ha is the atmospheric or absolute pressure. Hz is the vertical distance from the surface of the water to the pump centerline. Hf is the friction formed in …Low suction/low head pressures. Bevearage air Prep table not cooling-. R134a, AEA4440YXA hermetic. pressures were about what they should be for a cap tube system (roughly 150/25 psi) but just blowing around warm air. Plate said 7 oz of R134A but I pull out 2 lbs so I evacuate and recharge with 7oz and now the pressures are way down.Fig. 3.55 illustrates this by plotting the pump discharge head vs. flow for high- and low-suction tank conditions. The control valve, however, tries to maintain a steady pressure. As a result, the flow rate varies as the suction pressure varies. In some cases, the flow rate may drop to below the recommended minimum at very low head conditions.Are you confused about all the different blood pressure readings? You aren’t alone. Read this quick guide to learn more about the difference between systolic and diastolic, what no...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.problems. Fluid flows from areas of high pressure to areas of low pressure. Pumps operate by creating low pressure at the inlet which allows the liquid to be pushed into the pump by atmospheric or head pressure (pressure due to the liquid’s surface being above the centerline of the pump). Consider placing a pump at the top of the mercuryRepeatedly tripping sentronic+. 35 psi net oil press. No press difference between crank and suction. Crankcase heater working. R-22 40 psig suction 160 psig head, 8* sh at comp. sorry no sc data. 40* outdoor ambient. Sh measurements taken at each evap outlet right around 4*. No one evap showing major flooding.Low suction pressure causes. low suction pressure is developed in the refrigeration system. Some of the most probable causes are as below, The coil is covered with dust or frost. Restriction in the refrigerant line. Filters and strainers are dirty. Faulty fan motor. Low room temperature. Faulty compressor.1. Even though this is not the cause of high suction, Clean The Evaporator, because it needs to be clean. If it's dirty, it causes LOW suction pressure, and causes inexperienced techs to overcharge a system. 2. Just for kicks, and for a learning experience, check the system vitals, and record the pressures, water temp entering and leaving the ...temperature efficiency. 9. The approach temperature for the evaporator is. A. the difference between the suction and head pressures converted to temperature. B. the difference between the refrigerant boiling temperature and the suction-line temperature. C. the difference between the refrigerant boiling temperature and the inlet water temperature.are serviceable by a manufacturer-approved repair facility will lead to compressor inefficiency may cause high suction pressure and low head pressure Correct! All of the above. A suction line may also contain a ____. ... If a condenser has high head pressure and a higher than normal temperature, a technician could ____. ...Cause #1 Return Duct Leakage:. The suction pressure can be high if the room temp is high, or the return duct has leaks. Cause #2 TXV Improperly feeding: Cause#3 Outdoor/Indoor coil dirty: low airflow situations can cause refrigerant to not completely condense into a liquid, or turn into a gas Cause #4 Unit is Overcharged: One of the most commonly overlooked situations, if you are overcharged ...Low Load. While we often think of the combo of low suction, superheat, and head pressure as being caused by low airflow, it actually falls under a larger heading of low evaporator load. That simply means that the quantity of heat being picked up in the evaporator is lower than the refrigerant mass flow rate requires for the desired operation.180 suction line pressure 320 discharge 10 degree temp split. No temp difference across the filter drier. I cleaned coils and checked airflow just to eliminate the variables. I recovered the refrigerant, changed the filter drier, charged about 2lbs before starting the compressor and the low side shot right up to 170. System holds about 8 lbs total.HIGH SUCTION PRESSURE / LOW HEAD PRESSURE ISSUE. Hey guys, need some help i am working on a carrier unit with a Scroll Compressor. I am getting 80 PSIG low side and 165 PSIG high side. Liquid Line is also very hot to the touch. I know this is not normal readings and since it's a scroll compressor, I am thinking about replacing the TXV.Check the temperature difference in the suction line between low superheat and normal subcooling, which let’s say is 51°F in this example. Also, record the suction pressure, which is 70 psi (converts to 41°F using an R-22 temperature-pressure chart). Calculate the temperature difference: 51°F – 41°F = 10°F.High Suction Pressure R-410a. i went to check an 3.5 ton a/c brand is a ICP (international comfort products) Model WAPL424A1, not cooling my pressures were low side 185 to 190 and high side was around 350 on a 107F hot day. It has a piston as a metering device and compressor was running at 11.50 amps and RLA is 17.25 amps.Description: HHL-Flomax (High Head Low Flow) "HR" high pressure self-priming centrifugal pumps meet USCG specifications for auxiliary fire control. The high suction centerline and impeller design eliminates premature priming loss while ensuring consistent priming Discharge Size: 1.5 inch; Maximum Discharge Flow: 108 to 180 GPM; Power …The margin of pressure over vapor pressure, at the pump suction nozzle, is Net Positive Suction Head (NPSH). NPSH is the difference between suction pressure (stagnation) and vapor pressure. In equation form: NPSH = Ps ‑ Pvap. Where: NPSH = NPSH available from the system, at the pump inlet, with the pump running.This article series explains the causes of high head pressure at an air conditioner or heat pump compressor motor? This article lists twelve causes of high …Head pressure 190 Suction Pressure 90 Suction line temp 54 inside temp 75 wetbulb 69 So ive been thru this problem b4 with the low head high suction so i assume piston or a-coil . I open up the duct and the other hvac guy has put in a 3ton acoil . I told the neighbor that he should replace the acoil with a 2 1/2 ton .By contacting an HVAC technician, you can get your AC system’s suction pressure back to normal levels. If you are experiencing a problem with your air conditioning or heating call us at 512-336-1431 to schedule an appointment. We’ll be glad to come out and take a look at the issue. 1431-183 A/C & Heating proudly serves Round Rock ...Net Positive Suction Head. Net Positive Suction Head or NPSH for pumps can be defined as the difference between the suction pressure and the saturation pressure of the fluid, expressed in terms of height of liquid column. NPSH is used to measure how close a fluid is to saturated conditions. Lowering the pressure at the …My suction is running at 45psi and head is at 110psi. I checked evap coil and filter and both were clean, so I figured it was low on R22. I added 7 lbs. (factory charge is 7.25 lbs) and pressures did not change. The suction line is frosting up to the compressor. I'm starting to think I have a bad reversing valve.It is possible to ensure that cavitation is avoided during pump operation by monitoring the net positive suction head of the pump. Net positive suction head for a pump is the difference between the suction pressure and …Subcooling is liquid pressure converted to saturated condensing temp - liquid line temp. A SC reading of 40 degrees would put your line temp at 97 degrees, which would be cooler than your outdoor ambient. The only way for that to happen would be from incorrect instrument readings or non-condensibles in your system.High suction pressure is a phenomenon in which the refrigerant-carrying suction line of an AC system exceeds the pounds per square (PSI) for which it’s …Subaru engines have a radiator and water channel design that uses pumped and pressurized coolant to stabilize its internal temperature. Unlike most internal combustion engines, ins...Advertisement Let's start with hurricanes, with their low-pressure "eye" and multitudes of thunderstorms spinning around it. You probably know that these large tropical cyclones ar...Net Positive Suction Head or NPSH for pumps can be defined as the difference between the suction pressure and the saturation pressure of the fluid, expressed in terms of height of liquid column. …If the motor turns the wrong way, the impeller could potentially back off the shaft, causing serious damage to the internals. 2. Clogged Suction. Make sure the suction pipe is free and clear of debris. Less flow into the pump, will obviously yield less flow out of the pump. 3. Worn impeller, wear ring, wear plate.Septic shock is a serious condition that occurs when a body-wide infection leads to dangerously low blood pressure. Septic shock is a serious condition that occurs when a body-wide...are serviceable by a manufacturer-approved repair facility will lead to compressor inefficiency may cause high suction pressure and low head pressure Correct! All of the above. A suction line may also contain a ____. ... If a condenser has high head pressure and a higher than normal temperature, a technician could ____. ...Faulty valves in an open-drive compressor ____. will lead to compressor inefficiency may cause high suction pressure and low head pressure are serviceable by a manufacturer-approved repair facility All of the above. vibration absorber, a filter-drier, and an accumulator. A suction line may also contain a ____. vibration absorber, ...Significance of Monitoring Head Pressure. Regularly monitoring head pressure is crucial for various reasons: Energy efficiency considerations: A well-regulated system consumes less power. System longevity: Systems with proper head pressure often have longer lifespans. Maintaining comfort levels: Stable head pressure ensures consistent …Hi, sorry you're having trouble. Low suction and high head is usually due to a restriction in the liquid line. Basically, you're starving the evaporator. If the unit has an expansion valve on the inlet to the evaporator, it may be defective. Some are adjustable, most residential ones, not. I would look there first.The children who would most benefit from quality early education are also the ones who tend to miss school the most. But there's a silver lining. Head Start, the childcare program ...Suction pressure high, head pressure low, superheat low, subcooling low, amp low. I don't see any superheat or subcooling I dont warranty Tinkeritus . Reply . 08-03-2012, 10:35 AM #4. michigan1. View Profile View Forum Posts View Forum Threads Professional Member Join Date Mar 2003 Location austin Posts 451 ...hs,max = p0 ρ ⋅ g maximum suction head. In this formula, p 0 denotes the (ambient) pressure on the liquid surface and ϱ denotes the density of the liquid. For pumping water with a density of ϱ = 1000 kg/m³ the maximum suction head at an ambient pressure of 1 bar is thus 10 meters.OPERATING PRESSURE POINTS “Systems using R-410A operate at higher pressures [than R-22],” points out the Field Diagnostics team. “For example, to produce an evaporating temperature of 40 degrees F and a condensing temperature of 115 degrees, the suction and head pressures would be 83 psia and 257 psia in an R-22 …Pump characteristics—such as flow, pressure, efficiency and brake horsepower—are shown graphically on a pump curve. The first item to look at is the size of the pump. The size of the pump, 2x3-8 is shown in the upper section of the graph. The numbers 2x3-8 indicates: The outlet (discharge port) is 2 inches.A dirty evaporator in an air conditioning system will cause what symptoms? Low Suction and Low Head Pressure (discharge) Technician "A" says that a compressor should pull 24" Hg during a vacuum test with 100 psig discharge pressure. Technician "B" says that a compressor should pull 26" hg to 28" Hg when discharging to the atmosphere.When anxious and afraid, narwhals' pulse drops dangerously low. Narwhals are not cool under pressure. When stressed, they use up almost all of their energy in an instant by essenti...1. Check Refrigerant Pressures. Hook-up refrigerant gauges to the pressure ports on the unit. Blue --> "True Suction" Low Pressure. Red --> High Pressure (Small liquid line) Allow the unit to run for 5-10 minutes. Monitor pressures as the system operates. Normal R-22 Suction Pressure = 60 - 80psig. 2.Step 1. Scale in a geothermal heat pump's fluid system results in an overall increase in fluid temperature high head pressure in the cooling mode and low suction pressure in the heating mode an overall decrease in fluid temperature low head pressure in the cooling mode and high suction pressure in the heating mode.Study with Quizlet and memorize flashcards containing terms like In a 2-ton capillary tube system, the unit does not develop full capacity. Heat pressure is low and suction pressure is high. What is the problem?, In a 2-ton capillary tube system, the unit does not develop full capacity. Head pressure is high, suction pressure is high, and there is no …
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When anxious and afraid, narwhals' pulse drops dangerously low. Narwhals are not cool under pressure. When stressed, they use up almost all of their energy in an instant by essenti...The SC might be normal , but the normal head for a r410 system w/ a 68* ambient should be closer to 300psi and the normal suction press should be closer to 110psi w/70* IDB. Those p/t's sound more like r22. kdean1, buttwheat liked this post. As others have said it sounds like a TXV and maybe low on juice.Try our Net positive suction head calculator or: In your reservoir, get fluid surface pressure: P surface. Get the distance between the pump and liquid surface: Z. If the tank is above the pump, multiply this value by -1. Obtain the vapor pressure for the system's temperature: P vapor. Also, its density is ρ. Note that g represents gravity.1. Even though this is not the cause of high suction, Clean The Evaporator, because it needs to be clean. If it's dirty, it causes LOW suction pressure, and causes inexperienced techs to overcharge a system. 2. Just for kicks, and for a learning experience, check the system vitals, and record the pressures, water temp entering and leaving the ...I arrive to find a loud compressor, 200 psi suction and 275 head. First thing that comes to mind is bad valves. A few minutes later the compressor cuts off on internal overload. I take a hose and cool it off. 10 min later, compressor kicks back on and pressures now seem normal (130/325) 13 subcool , 19 delta t.Lennox Learning Solutions teaches you what causes high head pressure on a heat pump in the heating mode.There is several factors that can cause hight pressur...The suction pressure, also known as the low-side pressure, for a 404A cooler typically falls between 55-70 psi. This pressure ensures that the refrigerant evaporates at the desired temperature in the evaporator, providing efficient cooling. ... What causes high head pressure on a walk-in cooler? High head pressure in a walk-in cooler can be ...Scroll Troubleshooting Solution Chart - Copeland A/C Specific. Deep Vacuum Conditions. Deep vacuum can cause arcing damage to the Fusite pins. Models built after September 1991 have an internal vacuum protection and stop pumping when the pressure exceeds approximate. 10:1. Scroll compressors should never be used to evacuate a system, allowed to ...This would typically cause a low suction pressure, and a low superheat. In heat mode, a dirty air filter causes low airflow across the condenser. This can cause extremely high head pressure. In heat mode, a dirty outdoor coil can cause a low suction pressure. As an example, Trane includes a pressure curve chart with many heat pump condensing units.I just wanted to pick every ones brain i could. I am working on trane condensor and have high head pressure and low suction pressure. It was 90+ out today and I dumped r-22 into the system and no matter what I did I could not get the suction line to sweat and the superheat never dropped below about 20 degrees. my head pressure was around 285 ...Low suction/low head pressures. Bevearage air Prep table not cooling-. R134a, AEA4440YXA hermetic. pressures were about what they should be for a cap tube system (roughly 150/25 psi) but just blowing around warm air. Plate said 7 oz of R134A but I pull out 2 lbs so I evacuate and recharge with 7oz and now the pressures are way down.Fig. 3.55 illustrates this by plotting the pump discharge head vs. flow for high- and low-suction tank conditions. The control valve, however, tries to maintain a steady pressure. As a result, the flow rate varies as the suction pressure varies. In some cases, the flow rate may drop to below the recommended minimum at very low head conditions.Mechanical Engineering. When a refrigeration system producing low to normal refrigeration operates continuously without stopping and has high suction pressure and high head pressure , the probable cause is 1. an inefficient compressor 2. a low side restriction 3. noncondensables trapped in the condenser 4. an undercharge of refrigerant.Both fans working fine. Good air flow through evaporator and condenser. There are no leaks, and no icing. I have tried adjusting the charge to raise the low side pressure, but in doing so would also raise the high side exponentially. (i.e. Increase the suction pressure by 20 psi, and the head pressure would jump as much as 150 psi) HIGH SUCTION PRESSURE / LOW HEAD PRESSURE ISSUE. Hey guys, need some help i am working on a carrier unit with a Scroll Compressor. I am getting 80 PSIG low side and 165 PSIG high side. Liquid Line is also very hot to the touch. I know this is not normal readings and since it's a scroll compressor, I am thinking about replacing the TXV. So we replace the compressor (same model #), replace the liquid line filter dryer, and evacuate to 500 microns. I weigh the charge in per the manual = unit's orignal charge + addl ounces per foot of lineset - total of 5# 6 oz. Start unit up, damn it, looks wrong immediatelY: Suction: 149.5 psi. Suction Temp: 55.4*F.we note (and you probably know better than I) that making sense of any refrigerant pressure reading requires also a note of the ambient temperature. If we take 75°F as an example point, R410 low side typical pressure would be about 120 psi and the high side between 410-420 psi. Your high side is a little low.This would typically cause a low suction pressure, and a low superheat. In heat mode, a dirty air filter causes low airflow across the condenser. This can cause extremely high head pressure. In heat mode, a dirty outdoor coil can cause a low suction pressure. As an example, Trane includes a pressure curve chart with many heat pump ….
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