Heat pump 410a pressures

Technical. Guidelines. Available in the following sizes. R-410A 25LB. CYLINDER 100 LB. CYLINDER 850LB. CYLINDER 1450 LB. Pressure-Temp Chart. R-410A. (R-32/125) (50 …

Heat Pump System. The Rheem Endeavor RP16AZ operates with the easy-to-use EcoNet Smart Thermostat, which optimizes system performance and provides a new level of protection and precision comfortwith features. RP16AZ - Cooling Efficiency: 17.0 SEER2/10.4 EER2 - Heating Efficiency: 8.1 HSPF2. Features.The compressor pressure ratio of R-407C with the original coil configuration was up to 12.7% higher during air-conditioning operation than R-22, but when the evaporator coil was changed to counterflow the pressure ratio dropped to 10% higher than R-22. During heat pump operation the compressor pressure ratio of R-407C was 4.3% higher for the ...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.An R-22 Replacement for New ACs and Heat Pumps. Freon™ 410A (R-410A) refrigerant offers higher cooling capacity and significantly higher pressure than R-22 for use in systems specifically designed for R-410A. This hydrofluorocarbon (HFC) refrigerant is compatible with polyolefin (POE) oils and replaces R-22 in positive displacement air ...RHEEM GREEN IS MORE THAN SKIN DEEP: The RPNL model features Earth-friendly R-410A refrigerant. WRAPAROUND CABINET : Rheem heat pump units are constructed with a powder-coat paint finish and galvanized steel cabinet to protect the condensing coil fins from yard hazards, extreme weather, and corrosion. BASE PAN: The entire Rheem heat …R−410A and R−22 air conditioner or heat pump. Model and serial numbers can be found on unit rating plate. Table 1—Air Conditioner and Heat Pump Model Number Nomenclature ... R−410A systems operate at higher pressures than standard R−22 systems. Do …

RHEEM GREEN IS MORE THAN SKIN DEEP: The RPNL model features Earth-friendly R-410A refrigerant. WRAPAROUND CABINET : Rheem heat pump units are constructed with a powder-coat paint finish and galvanized steel cabinet to protect the condensing coil fins from yard hazards, extreme weather, and corrosion. BASE PAN: The entire Rheem heat …Carrier, 9 yr old 3 ton residential heat pump (R410a)....not cooling. Suction pressure drops rapidly to about 10 psig when I turned it on. High side pressure only reached about 300 #. Compressor was v … read moreJul 22, 2011 ... The suction pressure and SST is normal, but 350 could be high for the head depending on the unit SEER. Residential 13 SEER equipment would be ...the low pressure control is set to cut out around 95 psig (6.7 bar) to prevent evaporator coil icing. The cut in setting can be as high as 180 psig (12.5 bar) to prevent rapid recycling in case of refrigerant loss. If an electronic controller is used, the system can be locked out after repeated low pressure trips. High Pressure ControlRefrigerant Temperature Pressure Chart. The refrigerant temperature pressure chart is a tool that is readily available yet rarely used to its full advantage. It is often referred to as the “PT” Chart, or “PT” card. The PT Chart typically lists the pressure on the left, and the corresponding refrigerant boiling point on the right.A heat pump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space. In cold weather, a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the …

Do you need to know how to charge a heat pump in the winter? This video about charging a heat pump in heat mode is just a quick demonstration of what to do w...Craig Migliacco. Jun 24, 2020. 7 min read. R-22 and R-410A Operating Pressures, Charging, and Recovery Setup! Updated: Nov 20, 2023. In this article, we will discuss an HVAC unit’s refrigerant pressure on both the high side and the low-pressure side while the system runs.Re: Heat pump overcharged in heating mode. . Depending on the make and quality of the thing the the outside heat exchanger is. split into 2/3 and 1/3, so when the thing is in cooling mode the outside cond. uses both 2/3 and 1/3 of the cond together to get total heat rejection but in heat. pump mode the outside heat exchanger (now evap) only ...Refrigerant Pressure Temperature Chart - PT Chart for R-410A, R-134A, and R-22. These are currently the three most widely used refrigerants on the market today for HVAC applications in residential and commercial use. R-22 refrigerant is the king and used widely in the residential and commercial markets followed by R-134A which is used in ...Liquid. 49,7 51,1 52,4 53,8 55,2 56,6. 58 59,5 60,9 62,4 63,9 65,5 67,1 68,6 70,3 71,9 73,5 75,2 76,9 78,7 80,4 82,2. 84 85,8 87,7 89,6 91,5 93,4 95,4 97,4 99,4 101,4 103,5 105,6 …R-410A Heat Pump 60Hz RXYQ96MTJU RXYQ192MTJU SiUS39-504 Design, Installation & Testing Instruction R-410A Heat Pump 60Hz SiUS39-504 1645 Wallace Drive, Suite 110 Carrollton, TX75006 [email protected] www.daikinac.com This book is made of recycled paper. SiUS39-504 Printed in U.S.A. 10/2005 AK.

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View and Download Rheem R-410A installation instructions manual online. PRL-JEC Series two-stage heat pump outdoor units. R-410A heat pump pdf manual download. Also for: Prl-jec series, 024jec, 036jec, 048jec, 060jec. RHEEM GREEN IS MORE THAN SKIN DEEP: The RPNL model features Earth-friendly R-410A refrigerant. WRAPAROUND CABINET : Rheem heat pump units are constructed with a powder-coat paint finish and galvanized steel cabinet to protect the condensing coil fins from yard hazards, extreme weather, and corrosion. BASE PAN: The entire Rheem heat …r-410a pressure temperature chart psig f° psig f° psig f° psig f° psig f° psig f° 12 -37.7 114 37.8 216 74.3 318 100.2 420 120.7 522 137.6 14 -34.7 116 38.7 218 74.9 320 100.7 422 121 524 137.9 16 -32.0 118 39.5 220 75.5 322 101.1 424 121.4 526 138.3R-410A Heat Pump 60Hz RXYQ96MTJU RXYQ192MTJU SiUS39-504 Design, Installation & Testing Instruction R-410A Heat Pump 60Hz SiUS39-504 1645 Wallace Drive, Suite 110 Carrollton, TX75006 [email protected] www.daikinac.com This book is made of recycled paper. SiUS39-504 Printed in U.S.A. 10/2005 AK.

Sep 17, 2017 · Heating mode: outside temp >65F: Run AUX only - lock out compressor (avoid high pressure) outside temp >10F and <65F: Run compressor and AUX as needed. outside temp <10F: Run AUX only - lock out compressor (avoid defrost cycling) Cooling mode: outside temp <60F: lock out compressor, run air handler fan only. Pardo et al. [34] tested on an R-410A heat pump the refrigerants DR-5A and L41-2. Increments of 3–6% were found in terms of cooling capacity using DR-5A, while for the system operating with L41-2, the cooling capacity was reduced by 1–7%. Burns and Chen [21] evaluated drop-in tests on a split heat pump with five R-410A alternative ...Craig Migliacco. Jun 24, 2020. 7 min read. R-22 and R-410A Operating Pressures, Charging, and Recovery Setup! Updated: Nov 20, 2023. In this article, we will discuss an HVAC unit’s refrigerant pressure on both the high side and the low-pressure side while the system runs.Jan 6, 2020 ... Low-pressure switches on Carrier equipment using R-410A are usually set to open at about 50 psi and close at about 100 psi. Note: Heat pumps ...A new air-conditioner using r-410a is used in heat pump mode. the high410a conditioner clearly homeworklib 410a pressureGoodman 410a charging chart. 410a gyazo saturatedR410a charging chart Charging 410a refrigerant pump hvac hvacrschoolI'm looking for a freon charging chart for a trane heat pump model. Check DetailsA new air-conditioner using r-410a is used in heat pump mode. the high410a conditioner clearly homeworklib 410a pressureGoodman 410a charging chart. 410a gyazo saturatedR410a charging chart Charging 410a refrigerant pump hvac hvacrschoolI'm looking for a freon charging chart for a trane heat pump model. Check DetailsHeat Pump. R-410A. Installation instructions manual. Rheem R-410A Installation Instructions Manual. Prl-jec series two-stage heat pump outdoor units. Also See for R …The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Refrigerant under-charge, due to a refrigerant leak or improper charge. TXV (TEV) malfunction, over-metering refrigerant. This condition is not likely to occur on smaller air conditioners or heat pumps that use a capillary tube to meter ...

Refrigerant Pressure Temperature Chart - PT Chart for R-410A, R-134A, and R-22. These are currently the three most widely used refrigerants on the market today for HVAC applications in residential and commercial use. R-22 refrigerant is the king and used widely in the residential and commercial markets followed by R-134A which is used in ...

In this video we go through the basics of checking a heat pump charge in heating. It can be tricky but its pretty simple if you do this..Title music:Music: B...Freon™ 410A is a non-ozone depleting high efficiency hydrofluorocarbon (HFC) refrigerant. Freon™ 410A has higher cooling capacity and operating pressures than R-22 for new equipment specifically designed for R-410A. ASHRAE # R-410A Applications – New applications only • Residential and commercial air conditioning (AC) • Heat pumps ...• Protected compressor - Compressors are protected internally by a high pressure relief valve and a temperature sensor, and externally by the system high and low pressure …About Ferguson HVAC. Ferguson HVAC is a national distributor of residential and commercial heating and cooling equipment, parts and supplies. HVAC contractors across the country rely on us for the best unitary and ductless equipment brands and for a wide-range of HVAC products including accessories, controls, air distribution supplies, and …Problem 5 (Heat Pump): A heat pump uses R-410a with high pressure of 4 MPa and an evaporator operating at -10 C so it can absorb energy from underground water layers at 4 C. Find the COP and the temperature it can deliver energy at.Mar 6, 2017 ... I wouldn't mess with the core removal tool yourself. On a 70 degree day, with the ac just sitting there not running, 410a is pressurized to 200 ...The Goodman® GSZ13 heat pump uses the environmentally friendly refrigerant R-410A and features operating sound levels that are among the best in the heating and air conditioning industry. R-410A is chlorine-free to help prevent damage to the ozone layer. With its 13 SEER rating, the GSZ13 will help reduce energy consumption throughout the … In this video we go through the basics of checking a heat pump charge in heating. It can be tricky but its pretty simple if you do this..Title music:Music: B... Since R410A refrigerant is charged under higher pressure, charging an R22 system with it will increase the force within the coolant lines. The pressure can become high enough for parts of the system to rupture. At the very least, leaks will occur. Mixing refrigerants is not an option either. This will contaminate the system, and the R22 will ...

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How to Read an R-410A PT Chart. 1. Identify Desired Temperature. Determine Temperature: Choose the required temperature for your system based on its application or specific needs. 2. Find Corresponding Pressure. Locate on Chart: Find the selected temperature on the P-T chart and note the corresponding pressure in psig (pounds per …Freon™ 410A is a non-ozone depleting high efficiency hydrofluorocarbon (HFC) refrigerant. Freon™ 410A has higher cooling capacity and operating pressures than R-22 for new equipment specifically designed for R-410A. ASHRAE # R-410A Applications – New applications only • Residential and commercial air conditioning (AC) • Heat pumps ...Problem 5 (Heat Pump): A heat pump uses R-410a with high pressure of 4 MPa and an evaporator operating at -10 C so it can absorb energy from underground water layers at 4 C. Find the COP and the temperature it can deliver energy at. …R410A Systems Run at a Different Pressure. Compared to an R22 system, an R410A air conditioner runs at a higher pressure. These systems operate at about 130 pounds per square inch (psi). In AC mode, an R22 evaporator coil will run at about 70 psi. ... Matching an R22 coil with an R410A condensing unit is not possible with an outdoor … Refrigerant Pressure-Temperature Home Back. Choose Refrigerant: R-410A R-22 °C °F: Psig-40-39-38-37-36 ... Advertisement All of the hydraulic systems on a backhoe get their hydraulic pressure from a hydraulic pump. There are two types of pumps in common use: In a gear pump, a pair of in...amount of refrigerant in a single unit system (amount of refrigerant with which the system is charged before leaving the factory) + additional charging amount (amount of refrigerant …34-273kW with EVI Compressor. This innovative heating and cooling system is designed to provide unparalleled efficiency, comfort, and reliability to your home or business, even in cold climates where temperatures may reach -25°C. The use of R410A refrigerant in our heat pump allows for improved energy efficiency and lower operating costs due ...Feb 13, 2022 ... How to diagnose, remove & replace a bad thermostatic expansion valve in a heat pump condenser.Both older R-22 and R-134 operate at lower pressures than R-410A. R22 Refrigerant Pressure Rules of Thumb Typical Off, Low, High side R22 Pressures & Temperatures. ... When you measure heat pump or cooling system pressures makes as much difference as where you measure it. When an air conditioning or heat pump system has turned off and … Refrigerant Temperature Pressure Chart. The refrigerant temperature pressure chart is a tool that is readily available yet rarely used to its full advantage. It is often referred to as the “PT” Chart, or “PT” card. The PT Chart typically lists the pressure on the left, and the corresponding refrigerant boiling point on the right. ….

Apr 22, 2020 · Most technicians in the HVAC field know the normal range of operation for the low-pressure side of an air conditioning system. This tends to be around 60 PSI to 85 PSI for R-22 and 105 PSI to 143 PSI for R-410A and is dependent upon operating conditions. On the high-pressure side of the system, there is a wide variation in pressure due to the ... The pressures in a heat pump should always remain within some specified range: this is a basic requirement for all heat pumps. ... R407C (dew point) at 24 bar and R410A at 37.5 bar. If you have any doubt you should choose a slightly higher value for the maximum working pressure rather than one that is too low. Another important question …Trying to diagnose a 2 year old Amana heat pump with high suction and discharge pressures in heat mode. ASZ 16 SEER OD unit matched up with an ARUF Goodman piston air handler. Both are 2 ton 410A units. 10kw heat kit and lineset is about 20ft long. HEAT MODE Unit is tripping out on high head(600psi).-40-39-38-37-36-34-33-32-31-30-29-28-27-26-24-23-22-21-20-19-18-17-16-14-13-12-11-10-9-8-7-6-4-3-2-1: 0: 1: 2: 3: 4: 6: 7: 8: 9: 10: 11: 12: 13: 14: 16: 17: 18: 19 ...Digital Fieldpiece Gauges: https://amzn.to/2LFjNnKR410A Equipment: https://amzn.to/2xv6AG5My Favorite Tool: https://amzn.to/3NIFJuOTools We Recommend: https:...heat pump. my bad with the run on sentence. its a lennox hpx15 3 ton system . reversing valve makes no noise what so ever was told by manufacture that i should see some pressure even if stuck in dead center. equalizes at 175 system running or not. as if compresser is not pumping, compresser never goes out on thermal. Reply.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.The R410A PT chart can be used to answer questions like: What are normal operating pressures for 410A? What is the pressure of r410a at 72 degrees Fahrenheit? What should gauge read for 410A? You can also use the R-410A PT chart to adequately calculate the superheat, total superheat, and subcooling temperatures. Heat pump 410a pressures, The high side guage was connected to the liquid line. Static, both guages are 160 psig. When the unit ran, BOTH guages dropped to about 130. The high side was perhaps 2-5 higher. The amp draw at the compressor was 8.6 RLA out of a 22.1 suggest maximum on the equipment sticker., Pumps are devices used to move liquids like water and fuel. Hydraulic pumps use liquid to convert mechanical energy into pressure and flow. Here’s a brief look at how hydraulic pum..., This rule is totally a fluke and has no scientific basis other than it just generally tends to work out that way. On a properly functioning R-22 system running in heat mode in 40-degree weather, the suction pressure tends to be around 40 PSIG. This guideline obviously doesn't work on an R-410A system or any other refrigerant., Trying to diagnose a 2 year old Amana heat pump with high suction and discharge pressures in heat mode. ASZ 16 SEER OD unit matched up with an ARUF Goodman piston air handler. Both are 2 ton 410A units. 10kw heat kit and lineset is about 20ft long. HEAT MODE Unit is tripping out on high head(600psi)., Physical Properties: R-410A has an atmospheric boiling point of -62.9°F [-52.7°C] and its saturation pressure at 77°F [25°C] is 224.5 psig. Composition: R-410A is a near-azeotropic mixture of 50% by weight difluoromethane (HFC-32) and 50% by weight pentafluoroethane (HFC-125)., View and Download Goodman R-410A installation manual online. R-410A OUTDOOR SPLIT-SYSTEM HEAT PUMP, 13 SEER & 14.5 SEER 1.5 TO 5 TONS – 1 & 3 PHASE. R-410A heat pump pdf manual download. Also for: Thgd series, Thgf series, Ghgd series, Thjd series, Thjf series, Yhjd series, Yhjf..., Geothermal/Water Source Heat Pump • R-410A Refrigerant • 0.75-1.5 Ton Single Speed. ... Where ‘gpm’ is waterflow in gpm and ‘Press Drop’ is the pressure drop through the unit heat exchanger at rated water flow in feet of head. Fan Power Correction Calculation, Mar 25, 2018 ... Suc press should be 120 psig, if the evaporating temperature is 5 degree Celsius. It is not depending on any make or TR of AC. This is ..., Cooling Pressure (PSI) @ Service Port (Tolerance +/‐5) Outdoor Temp (°F) Refrigerant Pressure vs. Temperature Charts for Pioneer Split Systems (R410a) 68 115 119 123 127 131 135 139 143 147 71 120 124 128 132 136 140 144 148 152 ‐ m p (°F) 74 125 129 133 137 141 145 149 153 157, of the heat pump and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized components, accessories, or devices CAUTIONS: • R-410A systems operate at approximately 60% higher pressures (1 6 times) than R-22 systems Do , R-32 has only one-third of the GWP than R-410A, uses 20% less refrigerant, is easier to recycle, and is more efficient. These qualities make it an even more environmentally-friendly alternative for keeping your home comfortably cool. This refrigerant’s GWP is only 675, compared to R-22’s 1,810 GWP and R-410A’s 2,088 …, Example 3: What are 410A pressures on a 70 degree day? The operating pressure of 410A on a 70 degree day is 201.5 psig. Example 4: What are 410A pressures on a 65 degree day? The operating pressure of 410A on …, A Carrier 15 Seasonal Energy Efficiency Ratio heat pump has a higher energy efficiency rating than a Carrier 14 Seasonal Energy Efficiency Ratio heat pump. The heat pump with a hig..., When connecting gauges, connect to the always-suction port on the low side. On quite a few systems, you can get your head pressure on the liquid line, but some systems may require you to connect to the discharge line to check the head pressure. A common rule of thumb is the 100-degrees over ambient rule; the temperature of the discharge line on ..., A heat pump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space. [1] In cold weather, a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the …, This manual is also suitable for: View and Download Daikin R-410A technical data manual online. Outdoor units. R-410A air conditioner pdf manual download. Also for: Rxs-g2v1b., at 50 to 70% higher pressures than R-22. Use only R-410A approved service equipment. Refrigerant cylinders are painted a “Rose” color to indicate the type of refrigerant and may contain a “dip” tube to allow for charging of liquid refrigerant into the sys-tem. All R-410A systems use a POE oil that readily absorbs moisture from the ..., R410a min. head pressure. before i ask let me say i am certified in R410a and i work with it almost everyday so please keep that in mind. i was always taught that if it was below 65 oat you have to keep a min. head pressure. what is a min head pressure for 410a? Reply. 02-15-2009, 05:31 PM #2., • Protected compressor - Compressors are protected internally by a high pressure relief valve and a temperature sensor, and externally by the system high and low pressure switches. • Reliable operation - Ball bearing fan motors provide superior performance in extreme, See Liquid Line Sizing For Cooling Only Systems with R-410A Refrigerant tables. Note: See unit Installation Instruction for proper installation. 3/8" Vapor Line Sizing and Cooling Capacity Losses - R-410A Refrigerant 1- Stage Heat Pump Applications Unit Nominal Size (Btuh) Acceptable Vapor Line Diameters (In. OD) Cooling Capacity Loss (%) , R410A Pressure Temperature Chart (In Fahrenheit) Printable PDF Temp er atu r e (° F ): R410A P r essu r e (p si g ):-60 ° F 0. 9 psi g-55 ° F 1. 8 psi g-50 ° F 4. 3 psi g-45 ° F 7. 0 psi g-40 ° F 10. 1 psi g-35 ° F 13. 5 psi g-30 ° F 17. 2 psi g-25 ° F 21. 4 psi g-20 ° F 25. 9 psi g-18 ° F 27. 8 psi g, May 5, 2016 · 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. , Cooling Pressure (PSI) @ Service Port (Tolerance +/‐5) Outdoor Temp (°F) Refrigerant Pressure vs. Temperature Charts for Pioneer Split Systems (R410a) 68 115 119 123 127 131 135 139 143 147 71 120 124 128 132 136 140 144 148 152 ‐ m p (°F) 74 125 129 133 137 141 145 149 153 157 , The Heat Pump Cycle. This pressure/heat energy chart lets us sketch out the desired behavior for our heat pump. Suppose we want to run our cold heat exchanger (outdoors) at 20°F and our hot heat exchanger (indoors) at 100°F. This means we want our low and high pressures to be 93 and 333 psi, respectively., The R410A PT chart can be used to answer questions like: What are normal operating pressures for 410A? What is the pressure of r410a at 72 degrees Fahrenheit? What should gauge read for 410A? You can also use the R-410A PT chart to adequately calculate the superheat, total superheat, and subcooling temperatures. , Apr 14, 2015 · Let's get started and see what we can do.Most manufacturers recommend charging by super heat and subcoolimg rather than pressures alone,and will vary slightly by manufacturer but as a rule low side of about 110 and high side about 280at 70 degree ambient. This will of course increase as temp warms up.ON an 85 degree day,probably 130 to 135 and ... , Let's get started and see what we can do.Most manufacturers recommend charging by super heat and subcoolimg rather than pressures alone,and will vary slightly by manufacturer but as a rule low side of about 110 and high side about 280at 70 degree ambient. This will of course increase as temp warms up.ON an 85 degree day,probably 130 to 135 and ..., Sep 28, 2020 ... R-22 and R-410A Operating Pressures on Air Conditioners! ... How To Add Refrigerant To Your Air Conditioner R410A ... Charging a Heat Pump at Start ..., The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Refrigerant under-charge, due to a refrigerant leak or improper charge. TXV (TEV) malfunction, over-metering refrigerant. This condition is not likely to occur on smaller air conditioners or heat pumps that use a capillary tube to meter ..., Both older R-22 and R-134 operate at lower pressures than R-410A. R22 Refrigerant Pressure Rules of Thumb Typical Off, Low, High side R22 Pressures & Temperatures. On a properly-charged and working air conditioning system using R-22 refrigerant. Low pressure refrigerant switches on Carrier HVACR typically open at 50 psi and close at 100 psi., May 26, 2012 · Head pressure: 118F 83 + 35 = 118F more or less shows on the high side gauge if I understand this correctly. Low side pressure: 125 psi = 42 saturation temp. 66.2 low side line temp. High side pressure: 335psi = 104 saturation temp. 83.1 high side line temp. Temp at the vent in rooms: 56.1F + or minus. Temp from supply side: 55.2F. , Hence, R454B is not a drop-in placement for R410A. Here are some of the reasons why this is the case: R410A operates at higher pressures than R454B. This makes the compressor and the condenser less able to work with a low pressure refrigerant; The components used to manufacture systems that use R410A are not suitable for flammable …, 410a ductless mini split operating pressures. I know that you should rarely put gauges on a ductless mini split, and that you should dump the charge and just weigh it in. I have heard that there are spec sheets that will give you "normal operating pressures" based on indoor and outdoor conditions. This would come in handy when servicing …