Heat pump 410a pressures

Our Ebook, Paperback, Workbook, Quick Cards: https://www.acservicetech.com/the-book This video is on Normal Operating Pressures are for Freon R-22 and R-410A...

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 ...Step #1 – If there is any frost on the outside unit, get it completely defrosted first. Step #2 – Check all the obvious things first, filter, coils, blower wheel etc…. If the unit isn’t clean, it will be really hard to check. When charging in heat mode, read manufacturer specifications first.Buy Goodman GSZB404210 3.5 Ton, 14.3 SEER2 Heat Pump, R-410A Refrigerant. Goodman technical support information, product brochures and more. Place Your Order by 1 pm for Same-Day Shipping. ... Low Pressure Safety Switch. Yes. High Pressure Safety Switch. Yes. Efficiency. Energy Efficiency Ratio 2. 12 EER2. SEER. 14.9 - 15.1 SEER. …Kelvin, a company born to solve steam radiator night sweats, is expanding beyond smart radiator covers with $30 million in fresh funds. Radiator Labs, a company born to solve steam...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. What are the normal operating pressures for 410a high and low side in a 2 ton heat pump? 125 PSI for low and 365 PSI for high, the high can vary as the outdoor temperature does, basically on an 85 degree day you should see about 365. It can get up to 400 PSI on a 95 degree day.And 500 PSI on a 110 degree day. The requirement to re-charge an air conditioner or heat pump system might be suggested by cooling coil icing or by complete loss of cooling, or by very low suction pressures, or very low head pressures, but short of those extremes, pressure readings won't tell you if the quantity of refrigerant that's in the system. On 2013-02-2 by Mike Hanabol.

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 …Oct 18, 2018 ... The head (high side) pressure depends on the TEMPERATURE at which the refrigerant (R-22) condenses in the condenser (outdoor coil). Add 15 to 25 ...Last updated: 27 Jun, 2017. Heat Pump: Heating. Re: High Discharge Pressure / High Head Pressure. As the system runs in the heating mode, the discharge pressure exceeds the normal operating pressure. R22 System. Normal Head Pressure = 175 - 250 psig. High Head Pressure = Above 275 psig. R410A System. Normal Head Pressure = 225 - 350 …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 ...Physical Properties. General physical properties for FreonTM 407C and FreonTM 410A are shown in Table 3. The pressure-enthalpy diagrams for FreonTM 407C are shown in …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.Jan 27, 2021 · Step #1 – If there is any frost on the outside unit, get it completely defrosted first. Step #2 – Check all the obvious things first, filter, coils, blower wheel etc…. If the unit isn’t clean, it will be really hard to check. When charging in heat mode, read manufacturer specifications first.

It's technical name is sphygmomanometer and it takes your blood pressure. But how does it do that? Advertisement Your heart is an amazing pump. It works reliably for decades, and i...2362 posts · Joined 2009. #2 · Mar 21, 2012. 100 head= 37 degree saturation temp. 35 suction = a negative 11 saturation temp. Can't have sweat at 11 below zero F so my guess is it's not 410A in there. Kind of looks like pressure readings for 134a. Reclaim,leak check,vacuum to 500 microns then charge with fresh 410A. H.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 ...Maybe my instructor said that to check the charge level on a heat pump in heat mode, the subcooling must be between 08-12 degrees F, and the delta T must be 16-20. I had 41 degrees Fahrenheit of subcooling. If the subcooling must be between 08-12 degrees F in heat mode, then my unit was overcharged. But the last time I checked my …FAQs about refrigerant pressures & charge quantity for air conditioners & heat pumps. This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate and …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.

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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. Page 6 • Outdoor Units • R-410A • RXS-G2V1B Specifications 2-1 NOMINAL CAPACITY AND NOMINAL INPUT RXS20G2V1B RXS25G2V1B RXS35G2V1B RXS42G2V1B RXS50G2V1B For combination Nominal 3.48 3.12 3.03 indoor units + Nominal 3.52 3.39 3.02 outdoor units Energy Label Cooling Heating Annual energy consumption...Heat pumps and chillers; Mini-split, multi-split and ducted-split units; Packaged Terminal Air Conditioners (PTACs) Opteon™ XL41 closely matches the performance of R-410A and in some cases provides superior capacity and efficiency. Additionally, Opteon™ XL41 has a GWP of 466: that's a 78% reduction vs. R-410A. BenefitsStep 19. Close the manifold and R-410 jug's valve handles. Disconnect the hoses and reinstall the caps on the service valve's ports. Advertisement. An azeotrope refrigerant blends multiple refrigerant compounds to form a single refrigerant. Most refrigerant blends boil at different rates and require complete evacuation before adding a full charge.

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.Nov 18, 2018 ... Heat Pump 12 Hight Pressure trips only in Heating. Love2HVAC with Ty ... (R-410A Heat Pump). HVAC Tech Tips•65K views · 21:47 · Go to channel .....Saturation Pressure-Temperature Data for R410A (psig)*. Temp (°F) Pressure. Temp (°C) assembled, piped and wired at the factory to provide a single-piece. unit for shipment and rigging. Each unit is pressurized with a holding. charge of refrigerant R-410A for storage and/or shipping. The compact design, clean styling, small footprint, and quiet operation. make these condensing units and heat pumps suitable for almost any. Here are some of the symptoms of this system: • Higher than normal discharge temperatures; • Low condensing (head) pressures and temperatures; • Normal to high condenser subcooling; • Normal to high superheats; • High evaporator (suction) pressures; and. • Low amp draw. Higher than normal discharge temperatures:A …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 CalculationJul 19, 2012 ... Intermediate pressure is most critical parameter which decides the system performance. There have been many research studies about cascade heat ...The typical 410a pressures on a 95 degree day are as follows; Liquid pressure: 296.4 psi. Vapor pressure: 295.5 psi. See all other pressures for R410 on different temperatures of the day from -49°F to 150°F below.R140a, otherwise called Suva 410a, AZ20, Forane 410a, or Puron, is a compound (zeotropic) made up of pentafluoroethane and difluoromethane, used as a refrigerant in ACs and heat pump systems. R410a is part of the hydrofluorocarbon (HFC) class of refrigerants and is composed of an equal amount of R125 and R32.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.

In this HVAC Training Video, I show the Step By Step Procedure for Charging R-410A Refrigerant into an Air Conditioner that is Low on Refrigerant. I show the...

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 ... 10.70 A heat pump uses R-410A with a high pressure of 3000kPa 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 at which it can deliver energy.FAQs about refrigerant pressures & charge quantity for air conditioners & heat pumps. This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate and …Feb 20, 2023 ... The operating pressure of 410A on an 85 degree day is 254.6 psig. Example 3: What are 410A pressures on a 70 degree day? The operating pressure ...Kelvin, a company born to solve steam radiator night sweats, is expanding beyond smart radiator covers with $30 million in fresh funds. Radiator Labs, a company born to solve steam...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...Saturation Pressure-Temperature Data for R410A (psig)*. Temp (°F) Pressure. Temp (°C) Temp (°F) Pressure. Temp (°C) Temp (°F)Blood pressure is a measurement of the force exerted against the walls of your arteries as your heart pumps blood to your body. High blood pressure (hypertension) is an increase in...

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After all, these are the two variables we directly control in the heat pump cycle. What we want to understand is how increasing/decreasing pressure and adding/subtracting heat energy affects the temperature. The chart below shows the pressure vs. heat energy relationship of R410a at a constant temperature of 60°F. Getting no guage pressure on York heat pump in cooling mode but compressor is running. Is compressor bad? On 2020-04-08 by (mod) - Causes of a refrigerant pipe leak due to cracking ... I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Pressures are 120headover 118 suction low side. What would be ...The pressures were still at the 130 on suction side and 335 on the high side, but the cooling has gone away, suction side does not get cool. It has a metering orifice, no txv So, I thought I may be overcharged, since the liquid got in. I reclaimed some 410a (not measured) which sent the pressure too 150 on suction side and 365 on high side ...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 …psig °f psig °f psig °f psig °f psig °f 12; –37.7. 114The main component of the experimental set-up is an air-to-water to water heat pump, which can work under the heating or cooling modes of operation. The refrigerant used is R410A. Figure 1 shows a schematic representation of the heat pump in the cooling mode of operation. The heat pump has a variable-speed scroll type compressor with vapor ...Apr 15, 2021 · 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) … ….

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. 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 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 …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. R410A is more efficient than R22, so SEER ratings of R410A air conditioners and heat pumps are higher when all else is equal. That’s just one point comparing R22 and R410A. ... The lines in an R22 unit are not capable of operating with the synthetic oil, since R410A operates with higher pressure than R22. If you decide to switch an R22 unit ...2362 posts · Joined 2009. #2 · Mar 21, 2012. 100 head= 37 degree saturation temp. 35 suction = a negative 11 saturation temp. Can't have sweat at 11 below zero F so my guess is it's not 410A in there. Kind of looks like pressure readings for 134a. Reclaim,leak check,vacuum to 500 microns then charge with fresh 410A. H.Refrigerant R-410A Pressure Temperature Chart - R410A is an HFC and is commonly used in residential and light commercial HVAC equipment for air conditioners.Page 1: Outdoor Units. TO QUALIFIED, LICENSED INSTALLATION INSTRUCTIONS SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT, AND OPERATION OF THIS UNIT. READ THESE INSTRUCTIONS THOROUGHLY BEFORE RP14 14 SEER ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO …operating pressures due to varying ambients, or widely varying evaporator loads • Bi-Directional control capacity • External equalizer • ZAA charge for R-410A systems TFE Series R-410A Specifications • Maximum working pressure: 630 psig The TFE R-410A series is designed for large tonnage heat pump, air Heat pump 410a pressures, 410a is a type of refrigerant that is widely used in air conditioning and heat pump systems. It is a blend of two hydrofluorocarbons (HFCs), namely. ... 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? ..., 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 ..., Page 1: Outdoor Units. TO QUALIFIED, LICENSED INSTALLATION INSTRUCTIONS SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT, AND OPERATION OF THIS UNIT. READ THESE INSTRUCTIONS THOROUGHLY BEFORE RP14 14 SEER ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO …, 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)., If mini-split Inverter AC (Heat pump) with R-410a refrigerant is over-charged. Does the pressure reading on suction/vapor side increase as well (measured while AC is running)? Read that when its working at full-speed cooling mode (lowest temp, highest airflow) the suction pressure should be 120-130psi. If some tech overfills the unit with ..., The pressures were still at the 130 on suction side and 335 on the high side, but the cooling has gone away, suction side does not get cool. It has a metering orifice, no txv So, I thought I may be overcharged, since the liquid got in. I reclaimed some 410a (not measured) which sent the pressure too 150 on suction side and 365 on high side ..., Typically, for a properly charged R-410A system, the low-side (suction) pressure may range from 120 to 150 psi, and the high-side (discharge) pressure may …, Break the vacuum on the system and supply liquid R-410A to the liquid line or receiver port. Weigh in the initial charge and ensure a proper vacuum was achieved. Adjust sensors or set points to operate the compressor continuously while charging the system. Add refrigerant to allow the discharge pressure to rise to 325-420 psig., This is where our friend R-410A came into play. New machines from 2010 and onwards were banned from using R-22. Instead, they were outfitted with R-410A. If you would like to read more about R-410A refrigerant please have a look at our Puron fact sheet. R-410A PT Chart. Let’s take a look at our pressure table for R-410A Puron., 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 ..., 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 ..., Jan 21, 2020 · Suction Pressure/EVAP DTD Rule of Thumb Another common old-school rule of thumb is that suction pressure should be close to the outdoor temperature in an R22 system. However, this rule of thumb (obviously) does not work on an R-410A system. A more applicable guideline is 20°-25° suction saturation below outdoor ambient. , in the suction line set in heat pump applications. 5. Liquid Line Solenoid not required if non-bleed TXV is used on the outdoor unit. L H L = Length of trap must be more than Indoor Unit Height (H) Figure 4-1. Indoor Unit with Inverted Suction oz. lb. kg. Part Number Connection Part Number Connection 112 7 3.2 0151R00004P 3/4" 0151R00004P 3/4" , in the suction line set in heat pump applications. 5. Liquid Line Solenoid not required if non-bleed TXV is used on the outdoor unit. L H L = Length of trap must be more than Indoor Unit Height (H) Figure 4-1. Indoor Unit with Inverted Suction oz. lb. kg. Part Number Connection Part Number Connection 112 7 3.2 0151R00004P 3/4" 0151R00004P 3/4" , 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 …, Step 1. The process involves heating R-410a at a constant pressure from an initial state (1) t... Four kg/s of R-410a at 20∘C and 400kPa is heated, while maintaining a constant pressure, to 80∘C. The heat is supplied by a heat pump that receives heat from the ambient air and work input, as shown in the following diagram., 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., 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. ... R-410a EPA Certification; R410a Heat Pump Heater Chiller Units; R22 vs R410A | Why It Matters; Temperature Pressure Chart | R-134A | R407C | R-404A | R-410A;, Efficiency and performance. R410A has been shown to provide better efficiency and performance in AC systems compared to older refrigerants like R-22. It has a higher …, Step 19. Close the manifold and R-410 jug's valve handles. Disconnect the hoses and reinstall the caps on the service valve's ports. Advertisement. An azeotrope refrigerant blends multiple refrigerant compounds to form a single refrigerant. Most refrigerant blends boil at different rates and require complete evacuation before adding a full charge., 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 …, Nov 2, 2003 · Recovery Of 410A Standard recovery procedures for R-410A remain unchanged. The only difference is the necessity to use a recovery machine and cylinders approved for the higher pressures of R-410A. Charging Since R-410A has a slight (0.3 degree) fractionation, it, like all other 400 series refrigerants, must be charged in the liquid state. , Applications: Air conditioning equipment and heat pumps. Only for newly manufactured equipment, not for retrofitting R-22 systems Performance: Presures are 60% higher than R-22, therefore should be used only in new equipment Lubricant Recommendation: Compatible with polyolester lubricant Retrofitting: For new equipment only Temp (˚F) R …, Recovery Of 410A Standard recovery procedures for R-410A remain unchanged. The only difference is the necessity to use a recovery machine and cylinders approved for the higher pressures of R-410A. Charging Since R-410A has a slight (0.3 degree) fractionation, it, like all other 400 series refrigerants, must be charged in the liquid state., In this HVAC Training Video, I show the Step By Step Procedure for Charging R-410A Refrigerant into an Air Conditioner that is Low on Refrigerant. I show the..., assembled, piped and wired at the factory to provide a single-piece. unit for shipment and rigging. Each unit is pressurized with a holding. charge of refrigerant R-410A for storage and/or shipping. The compact design, clean styling, small footprint, and quiet operation. make these condensing units and heat pumps suitable for almost any. , 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 …, work on 2 years old r410a heat pump,run in heat mode vapor line pressure 335 psig vapor line temp 80F,liquid line pressure 280psig,ture suction 98 psig,feel like the indoor txv check valve not open enough,switch out new txv,pressure both vapor and liquid only 2 psig different,and vapor line temp go up to 150F,pack u my stuff went home,5 hours later,customer call said not heating again,went ..., Nov 18, 2018 ... Heat Pump 12 Hight Pressure trips only in Heating. Love2HVAC with Ty ... (R-410A Heat Pump). HVAC Tech Tips•65K views · 21:47 · Go to channel ....., 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, 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., 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 …, Oct 10, 2021 ... ... pressures was between 160 and 220 for the R-410A Lennox system. Then, they checked the target subcooling. The heat pump needs to defrost ...