R407c Refrigerant Suction Pressure Discharge Pressure

The present research is concerned with the study of the effect of HFC refrigerant R407C on the vapour compression. Oil recharge values can be taken from DWM Copeland™ brochures or Copeland® brand products Selection Software. This table represents a pressure temperature chart for R134A. Standing pressure ( system not running ) will depend on surrounding temperature of outdoor unit. ft of the nominal charge at suction. Plate fin coil. If your freezer is stable at -2F, the evap coil should be only a few degrees cooler than that, so your low side pressure should really be something like 2-6 PSIG. Remember that since R407c is a 400 series blend it is a zeotrope that fractionates. The seal line advances toward the discharge side, tooth space is reduced, and compression is performed. Re: Working Pressure of R407C ive found the running pressures different. • A helix tube in tube water-cooled condenser is standard with refrigerant counter. ) on the p/t chart for 407c? ummternary blend i believe with a temp glide of about 10 deg f and uses poe. Visually inspect all of the following: expansion valve, thermostat and collector dryer. I got it ,but the mention pressure of suction 18-20. TESTING FOR CHARGE EVAPORATOR SUCTION LINE LIQUI D LINE EXP ANSION VALV E MATCHING REFRIGERANT KE Y TEMPERA TUR E SENSOR TEMPERA TUR E SENSOR SUPERHEATSUPERHEA T 2. high pressure refrigerant flow line. Can R407C tools be used? When charging additional refrigerant, charge the refrigerant from low-pressure side of the port valve using a safety charger. v Compressor motor current percent limit. This is especially true if the system has some type of head pressure control. 2 Maximum permissible inclination 4. R-407F Genetron®. Let us consider a theoretical vapour compression cycle 1-2'-3'-4' when the discharge pressure increases from Pd to Pd' as shown on p-h diagram. Defective overload protector. Recommendation: Increase Suction Pressure []. Check fan motor and its electrical circuit. Environmental aspects Global Warming and TEWI factor Eco-Efficiency. Low pressure suction gas is trapped within each crescent-shaped pocket as it forms; continuous motion of TECHNICAL SPECIFICATIONS. The pressure-relief valve will discharge in the event of a fault such as a power failure. Compressor reed valves are thin steel flaps fastened to the valve plate. Pressure gauges, permanently installed to monitor compressor suction and discharge pressures, are convenient when maintaining the system. High discharge temperature. Dupony input condition of the expansion device is determined by the condenser. , R-404A, R-507A, R-410A, R-407C) because some of these refrigerants can achieve operating pressures as high as 500 psia and operating temperatures as high as 300°F at a typical saturated condensing condition of 130°F. refrigerant to enter the evaporator, build up pressure, cause the low pressure control (C) to energize the com-pressor contactor and start the compressor. Mechanical Engineering Refrigeration and Air Conditioning Technology (MindTap Course List) Blocked suction cylinder unloading is accomplished by A. 1 Refrigerants 3. With R-407C, the pressure settings must reflect an average temperature of the refrigerant in the evaporator. ZR16 to ZR54K5E R-22 and R-407C. 8 1 3/8" 10. Moving to the high-pressure side of the refrigerant circuit we address the small amount of discharge line the same way as the suction line except we use the specific volume at 256 degrees, which is. Outlet air pressure Correction dew point (°C) factor. 4 What is its revised capacity if this receiver is used with R-407C ? 299 lbs x 0. ✅ Browse our daily deals for even more savings! ✅ Free shipping on many items!. Low suction pressure (pressure transducer). Your session was interrupted. present, measure the pressure and the temperature at the location that the sub-cooling information is needed. This is the same guidance given for R-22 and other common refrigerants. By contrast, an electronic HGBP valve can regulate bypass flow to maintain the desired suction pressure or discharge air temperature. Dual access valves on both the inlet and outlet sides for easy pressure readings. com, of which valves accounts for 37%, pressure gauges accounts. 1 Setting up 4. If damage or fault is found, replace affected part as required. Products Refrigeration Equipment. discharge pressure and that at the entrance to the condenser. By contrast, an electronic HGBP valve can regulate bypass flow to maintain the desired suction pressure or discharge air temperature. operating the purge system to see how much air comes out. 38 email: [email protected] Refrigerant type Refrigerant charge N. 0 40°c 60°c 80°c 10000 1000 100 10 1 35 30 25 20 15 10 5 0-25-25 0 0 25 25 50 50 75 75 100 100 pressure temperature bar °c °c 100% 90% 80% kinematic viscosity 70% temperature. Pressure Temperature Chart 800. Pressure drop should not cause: • vapour formation in line • insufficient liquid pressure at DX device. Volume (L) Maximum Refrigerant Pressure (kPa) Maximum Fluid Side Pressure Without Pump(s) (kPa) Maximum Fluid Side Pressure With Pump(s) F (-9. integral discharge check valve, suction and discharge service valves and internal pressure relief valve. The new fluid to be. P Refrigerator Nominal Output Refrigerant Discharge Capacity Discharge Pressure Discharge Capacity Rated [Dryer] PQ WIDE MODE Model Item∙Unit OSP-22VA(R)N2 OSP-37M5A(R)N2 OSP-37M6A(R)N2 OSP-22M5A(R)N2 OSP-22M6A(R)N2 OSP-37VA(R)N2 22 4. Kothandaraman Refrigerant Tables and Charts, Including Air Conditioning Data C. Besides that normal R22 compressor can replace with R410A. When the valve opens, hot discharge gas is routed back into the area of the motor protector to cause a trip. Plug in the Temperature Sensor and mount the sensor as shown. But for R410A pressure will be more higher that R22. If your freezer is stable at -2F, the evap coil should be only a few degrees cooler than that, so your low side pressure should really be something like 2-6 PSIG. suction accumulators available in standard sizes and volumes, to make your transition to R410A as seamless as possible. R-407C Refrigerant Pressure Temperature Chart. In any system, whether it is new or old, measurably higher pressure drops in the discharge line need to be taken into consideration in sizing the condenser and compressor. EXAMPLE If you were using 1,000 pounds of R-22, you’ll need about 955 pounds of 407C, as follows: Pounds of 407C = 1,000 x 70. Thank you and stay healthy!. Modulating Three-Way Valve Discharge App. 0:1 An R-410A heat pump operating in the cooling mode has a suction pressure of 118 psig. Environmental Protection Agency, states that R134A is not flammable at ambient temperatures and not corrosive to metals such as aluminum. When disconnecting the suction or discharge pipe of the compressor at the welded section, release the refrigerant gas completely at a well-ventilated place first. Systems operating on R410A run at a pressure of about 1. Kothandaraman Refrigerant Tables and Charts, Including Air Conditioning Data C. keeping the suction valve closed. However there are other forces also affecting the high side pressure. A temperature/pressure chart will tell you the saturated temperature that corresponds to any given pressure. Compressor operation is possible within the limits shown on the diagrams of application. Check compressor fan for noisy operation, high suction pressure, or excessively low discharge pressure. Evacuate the suction and discharge pressure sides using the vacuum pump. In this problem, discharge pressure 235. n and the expansion is also polytropic but with 35 1. Here again, the compressor can only pump what it can see so it must work harder, therefore, higher heat of compression is generated in compressing a low suction pressure to a suitable condensing pressure. 9 Charge Calculation Scan to learn. Vapour Pressure: 10. Suction and liquid service valves Fan speed head pressure control Low ambient start timer 3 minute delay timer / random start timer… Outdoor Unit 1ph CKC R407C | Marstair CKC20 R407C O/D 1PH | HRP - refrigeration & air conditioning. hi, anyone familar with R410A. 7 equals 50 PSIA. 5 R407C) must always be added to the refrigerating plant in liquid form. At compressor stop, pressure equalizes relatively quickly between suction and discharge side. Products Refrigeration Equipment. The bubble pressure is used for determining the system pressure when the refrigerant is in a saturated liquid or subcooled. These hermetic reciprocating compressor use pistons driven by a crankshaft to deliver refrigerant at high pressure from the low side to the high side… AJ - R407C | Tecumseh AJ5512C Compressor R407C 1PH T/T PSC | HRP - refrigeration & air conditioning. For glide refrigerants such as R407C there is a need to determine the appropriate temperatures to define the suction and discharge conditions. The core of a refrigeration system is the compressor, which is designed to pump cool refrigerant gas from the evaporator into the condenser. Feel free to contact us via phone, email or just send us mail. day but your low side pressure should be around 70 psi. Because of refrigerant glide, the refrigerant entering the evaporator for a specific suction pressure is approximately 10 F colder than the refrigerant vapor at the outlet of the evaporator (not. Pressure values are displayed for R-22, R-410a, R-407c, R-134a and R-404a refrigerants. Analyzed Refrigerants: R22, R32, R134a, R404A, R407C, R410a, Hydrocarbons (HC) and Air. For mixed or blended refrigerants such as R407C and R410A, in which multiple refrigerants with different boiling. AC Repair Denver: Troubleshooting R-22 Refrigerant Pressures by Weatherwise on 05/09/11 The air conditioning pressures in the Denver area are slightly different than lower elevation ac systems. The refrigerant R134a Especially in the area of normal refrigeration for supermarket appli-cations numerous studies have shown that R134a as a refrigerant contributes to a very high efficiency of the system. SUBJECT: TEMPERATURE - PRESSURE CHART FOR FYI #289 9/17/2009 R-22, R-410A, R-407C, R-134A & R-404A REFRIGERANTS ADVANTAGE Engineering, Inc. By cooling the intermediate pressure refrigerant after the 1st stage discharge, the final discharge temperature can be reduced. Air and water-cooled chillers and heat pumps with R407C With parallel installation on two circuits, and thanks to the absence of suction and discharge valves. While R-410a is a high-pressure refrigerant, it can be stored in the back of your service van as long as the temperature inside the vehicle does not exceed 125F. With R-407C, the pressure settings must reflect an average temperature of the refrigerant in the evaporator. Systems operating on R410A run at a pressure of about 1. 77 pounds of refrigerant. This may require adjusting the high pressure safety controls to operate as intended. Compressor power decreases with pressure difference across the compressor. The evaporated refrigerant then enters the compressor at an intermediate pressure level. Use refrigerant piping made of. « Previous Thread | Next Thread ». available head pressures, the necessity to overcome the pressure drops associated with complex TAEevo tweevo - haeevo - taeevo laser. Fellow ASHRAE McQuay International Staunton, Virginia USA 1 What is a Refrigerant? • In a refrigerating system, the medium of heat transfer which picks up heat by evaporating at a low temperature and pressure, and gives up heat on condensing at a higher temperature & pressure. Refrigerants and their Application Presented by Thomas E. Locating the suction side service valve. R407C, R407C refrigerant, HFC, 115 lb. Condenser, Air Cooled. OPERATING PRESSURE POINTS. R-134A is a refrigerant frequently used in automobile air conditioning. should incorporate the hot gas bypass option. Purge with a minimum amount of refrigerant and attach high pressure gauge hose to the liquid line (smaller refrigerant line) pressure tap. Products Refrigeration Equipment. 12, 22, 134a, 407C, 410A, 500, 502, HP, MP and blends. com “making your life easier” COIL TEMPERATURE CHART INSTRUCTIONS Select design temperature for your evaporator and condenser-Match to approx. Because we need monitor refrigerant pressure & temperature in suction and discharge pipe. Disposable Can GENETRON 422D (R-422D) R-22 RETROFIT SOLUTION, Honeywell R422D Retrofit Your R-22 A/C or Refrigeration System Today with this "drop-in" replacement, R422D. The discharge requirements remain the same. Leak detection is especially important for units charged with refrigerant R-407C. Imperial data • Discharge and suction pressure cutout settings • System discharge and suction pressures • Anti-recycle timer status for each The saturated condensing and suction conditions are referenced to the dewpoint for R-407C. Section 3; Removing refrigerant. A refrigeration evaporator is operating with R-22 refrigerant at 69 PSIG suction pressure; its saturation temperature is 40F. This would need to be checked out by a HVAC tech to see if there are any leaks or blockages in the refrigerant system. Ass a refrigerant, a liquid capable of vaporizing at low temperature, used in automotive air conditioning, the U. The suction pressure and discharge pressure of compressor were assumed as the evaporation pressure and condensation pressure of the system respectively. To use the HVAC Technical Support AC Pressure Temperature Chart, Turn unit on; monitor system running approximately 15 to 30 minutes. R407C Refrigerant. Suction or, as it is also known, low side pressure, is one of the critical variants in the operation and diagnostic processes of air conditioning and refrigeration. Pressure in excess of 70 psig, under normal operating conditions, will be considered to be high pressure. High pressure above max operation range of the pressure switch. •Measure the Suction line temperature •Find the Dew point temperature from the Low pressure gage and subtract from Suction Line temperature •You now have the subcooling •Example 407C –Measured liquid line temperature is 44. Discharge valve leaking. For mixed or blended refrigerants such as R407C and R410A, in which multiple refrigerants with different boiling. With R-407C, the pressure settings must. Refrigerant type Refrigerant charge N. R410A is an HFC refrigerant, invented by Honeywell, that has been developed to replace the HCFC refrigerant R22. HIGH SIDE - Same as head pressure; side of system which includes vapor into condenser and liquid to expansion valve. These hermetic reciprocating compressor use pistons driven by a crankshaft to deliver refrigerant at high pressure from the low side to the high side… AJ - R407C | Tecumseh AJ5512C Compressor R407C 1PH T/T PSC | HRP - refrigeration & air conditioning. Often a muffler is used on the outlet side of the compressor (fig. adding heat with circulated hot water or heating blankets. DRY BULB TEMPERATURE - Temperature read with an ordinary thermometer. Factory mounted on base using spring isolators. Be sure to open the refrigerant line to allow the nitrogen to bleed off and not pressurize the piping. This unloads the compressor, resulting in lower discharge pressure, higher suction pressure, and less power consumption. As the refrigerant pressure increases due to an abnormal condition, the pressure increases slowly above the relief valve setting & the piston begins to lift until there is enough flow to pop the piston open & provide full discharge. If more rooms shut down then the suction pressure will drop to cut out point and the compressor will stop. The adoption of an intercooler (IC) can solve this issue. 32 kg/min) 11. 5 ton I understand. The Discharge Pressure is the result of compressing the low side vapours. Choose top quality brands Four Seasons. Condenser, Air Cooled. Systems that use a low pressure controller to maintain space temperature may need to have the cut in and cut out points changed. The temperature at which system refrigerant will condense in the condenser; this temperature corresponds to the high side pressure in the system on a pressure/temperature chart. This would need to be checked out by a HVAC tech to see if there are any leaks or blockages in the refrigerant system. Common Causes Of High Compressor Discharge Pressure. If used in. Genuine Ford Part - F1FZ19A834H (F1FZ-19A834-C, F1FZ-19A834-H, F1FZ19A834C). Locating the suction side service valve. But for R410A pressure will be more higher that R22. Dupony input condition of the expansion device is determined by the condenser. For other saturated suction temperatures with 8. 10914 NW 33rd St. 3) R43T Suction pipe thermistor Detect accumulator outlet temperature and protect compressor. Unregulated gas pressure can seriously damage the system and endanger human life. Low pressure suction gas is trapped within each crescent-shaped pocket as it forms; continuous motion of TECHNICAL SPECIFICATIONS. Replace defective valve. 4 C) to 40 F (4. If the actual refrigerant temperature. While the discharge line pressure drop is not as critical as that of the suction line, the accepted maximum values are 4 psi for R-12 and 6 psi for R-22. Compare it to the SATURATED LIQUID (Bubble Point) TABLES. By Alec Johnson Jan 11, 2020. R-407C, also has another disadvantage as compared to R-22. Defective overload protector. In freezers pressures are ok. 2 Maximum permissible inclination 4. 10 degree temp split. USING LINE SIZING CHARTS Basis These line sizing charts are based on a suction pressure drop equivalent to a 2°F change in saturation pressure and liquid line pressure drop of 5 psi. Ac R22 Pressure Chart R600a refrigerant pressure temperature superheat chart for r22 refrigeration and air conditioning all than optimum performance normal operating pressures for r22 hvac normal operating pressures for r22 hvac. BAO-106-2 AUS 5 8. certified suction accumulators intended for use with R410A refrigerant. Attach center hose of manifold gauge to R407C cylinder, purge the charging line, open valve on R407C cylinder and allow refrigerant pressure to build up to about 40 psig. The boiling points are referred to as condensing temperatures or SDT (saturated discharge temperatures) in condensers and evaporating temperatures or SST (saturated suction temperatures) in evaporators. To use the HVAC Technical Support AC Pressure Temperature Chart, Turn unit on; monitor system running approximately 15 to 30 minutes. Oil recharge values can be taken from DWM Copeland™ brochures or Copeland® brand products Selection Software. 294MPa, recover refrigerant inside the oil trap kit to reduce the Before removing the oil trap kit after flush-ing operation, make sure to discharge and process the oil Precautions for Devices that Use R407C Refrigerant Caution. When the valve opens, hot discharge gas is routed back into the area of the motor protector to cause a trip. 4 Add refrigerant from the charging valve after the com-pletion of the work. The present disclosure provides a refrigerant vapor compression system includes a compressor ( 12 ) having a suction port and a discharge port, a refrigerant heat rejection heat exchanger ( 24 ) operatively coupled downstream to the discharge port of the compressor, a refrigerant heat absorption heat exchanger ( 42 ) operatively coupled downstream to the refrigerant heat rejection heat. 3) R43T Suction pipe thermistor Detect accumulator outlet temperature and protect compressor. All refrigeration piping should be installed with high temperature brazed joints. A/c refrigerant suction hose (front). Let's say a system has 45 psi suction pressure (converts to 22F) and 68F suction line temperature, the superheat is 46F (68. refrigerant to be trapped in sections where hydrostatic pressure can develop. refrigerant flow, low head pressure generally causes insufficient refrigerant to be fed to the evaporator. Absolute Discharge Pressure divided by Absolute Suction Pressure. Discharge valve Cylinder head Suction and liquid line flange Suction valve. Refrigerant always flows from high pressure to low pressure. Displacements and Line Sizes SUCTION DISPLACEMENT LINE SIZES MODEL 60 HZ 50 HZ SUCTION DISCHARGE 1111 118 CFM 167 M3/HR 2 5/8” ODS 2 1/8” ODS. We have already discussed that in actual practice, the discharge pressure (or condenser pressure) increases due to frictional resistance of flow of the refrigerant. But for R410A pressure will be more higher that R22. (Corresponding change in R22 satura-tion temperature. Dupony input condition of the expansion device is determined by the condenser. 6 psig) suction and discharging at various pressures. An R410A heat hump operating in the heating mode has a suction pressure of 85 psig and head pressure of 385 psig. discharge and liquid lines, and. Analyzed Refrigerants: R22, R32, R134a, R404A, R407C, R410a, Hydrocarbons (HC) and Air. • Encapsulated, automatic reset, high pressure control, and an adjustable low pressure control with flexible refrigerant hose to reduce possibility for leaks. With R-407C, the pressure settings must. If the units are further apart However, for discharge pipe temperature abnormal and high pressure abnormal, the LED lamp lights continuously for 24 hours, as long as the. The bubble pressure is used for determining the system pressure when the refrigerant is in a saturated liquid or subcooled. 10914 NW 33rd St. Recovery capabilities Compressor Weight Refrigerant compatibility Features RecoverXLT2-AP #95764** RecoverXLT #95765 740-98 Vapor Push/PullLiquid. 10MPa·G or over. R-407F Genetron®. HCFC refrigerants R22 as transitional HFC Alternatives for R22 R407C as substitute for R22 R410A as substitute for R22 R417A, R417B, R422D and R438A as substitutes for R22 R427A as. This is the maximum allowable pressure drop for the entire. DISCHARGE PRESSURE SWITCH Opens -- 90MA psig (kPa) 395±10 2725±69 SUCTION PRESSURE SWITCH Opens psig (kPa) 27±4 186±28 Refrigerant 407C LEGEND. I graduate from a Heating and Cooling course in 2 weeks. Sample Gas Extraction: Pressure from cylinder or system. com, of which valves accounts for 37%, pressure gauges accounts. 3⁰F –Liquid pressure 70PSIG = 34. Discharge Pressure. Compressor power decreases with pressure difference across the compressor. 3) R43T Suction pipe thermistor Detect accumulator outlet temperature and protect compressor. Energy efficiency is comparable to R22. Refrigerant price / availability R-407C Refrigeration Replacements R-404A Suction Pressure (psi) Discharge Pressure (psi). Common Causes Of High Compressor Discharge Pressure. As we can see in the Ph diagram below. The suction pressure drops and the compressor unloads. 6 times that of similar systems operating on R22. present, measure the pressure and the temperature at the location that the sub-cooling information is needed. They are designed to operate with R407C refrigerant, recognized as being safer for the environment. would the normal head pressure be equal to ambient +30 (above 70 deg f. Systems operating on R410A run at a pressure of about 1. Performance of R407C as an Alternate to R22: A Review. Refrigerant R22 has approximately 55% higher refrigerating capacity and pressure levels than R12**. Clean walk-in cooler and walk-in freezer condenser coils. Ships from Lakeland Ford Online Parts, Lakeland FL. The measurement method using a 3 transducers array is presented. 9473 = 283 lbs. In refrigeration and air conditioning systems, the suction pressure' (also called the low-side pressure) is the intake pressure generated by the system compressor while operating. not defined by a single pressure-temperature relationship) such as R407C. 0 40°c 60°c 80°c 10000 1000 100 10 1 35 30 25 20 15 10 5 0-25-25 0 0 25 25 50 50 75 75 100 100 pressure temperature bar °c °c 100% 90% 80% kinematic viscosity 70% temperature. As the suction line temperature changes, the bulb pressure changes. Installed pressure gauge taps in the chilled water inlet and outlet piping or as shown in Figure 4. This test consists of 100 most important questions that will help you clear the certification exam of the same. Condenser, Air Cooled. If the residual pressure is exceeding 0. • The Standard unit controls permit operation down to -18°C (0°F) outdoor ambient temperature. com email: [email protected] Stabilised discharge pressure (psig): 113 for R600a and 290 for R290 for low back pressure R290 is a good replacement for R22 The boiling points of R290 and R22 are very close matches, 42. Some model scrolls have an internal pressure relief (IPR) valve. VALVE TYPE. Modulating Three-Way Valve Discharge App. ✅ Browse our daily deals for even more savings! ✅ Free shipping on many items!. Compressor overload (Kriwan). Qualified refrigerants R22 R404A, R407C, R134a, R22, R507, R407A Copeland® brand. In a VRF system it was noticed that Ideal pressure is 295 psig. Plate fin coil. Let's say a system has 45 psi suction pressure (converts to 22F) and 68F suction line temperature, the superheat is 46F (68. 12-36 -38 17. This suction. Your session was interrupted. The leaking refrigerant will splatter on the neighboring parts of the car. Liquid refrigerant in the V-604 is essentially at the discharge pressure of K-601 and is sent to the Process Gas Chiller E-521. Pressure relief valves are designed and engineered to provide high-volume discharge primarily for use on liquid receiver applications above the liquid refrigerant level. ) LINE SIZE - inches MAX. Do not use a refrigerant other than R407C. The pressure-relief valve will discharge in the event of a fault such as a power failure. • System contains refrigerant and oil under pressure. Plug in the Temperature Sensor and mount the sensor as shown. hi, anyone familar with R410A. Pressure in excess of 70 psig, under normal operating conditions, will be considered to be high pressure. With R-407C, the pressure settings must reflect an average temperature of the refrigerant in the evaporator. From the R-407C chart, 250 psig is = 108°F saturated liquid temperature. Because of the pulsating nature of the refrigerant gas flows within a reciprocating compressor system, it is advisable to connect gauges to the system using throttle valves. Figure 3 provides the compressor pressure ratios of all the refrigerants normalized (Pr,N) with respect to that of R410A. High pressure above max operation range of the pressure switch. The AC Refrigerant pressure switch monitors the pressure inside the AC system. Suction pressure is a term used to describe the pressure of a refrigerant gas at the intake point of a refrigerator or air conditioner compressor. Motor overload cutouts are activating. The entire refrigerant is now held between the discharge valves of the compressor and the liquid line solenoid valve. Air and water-cooled chillers and heat pumps with R407C With parallel installation on two circuits, and thanks to the absence of suction and discharge valves. Two pressure indicators are provided on control. Suction and liquid service valves Fan speed head pressure control Low ambient start timer 3 minute delay timer / random start timer… Outdoor Unit 1ph CKC R407C | Marstair CKC20 R407C O/D 1PH | HRP - refrigeration & air conditioning. Why is this important? Refrigerants with mass flow rates within 10 to 15% of R-22, with similar suction and discharge pressures, should not require any expansion device or line set changes during retrofit. Refrigerant Pressure Temperature Chart For 41600 Series Manifolds or Universal Application. available head pressures, the necessity to overcome the pressure drops associated with complex TAEevo tweevo - haeevo - taeevo laser. Mechanical Engineering Refrigeration and Air Conditioning Technology (MindTap Course List) Blocked suction cylinder unloading is accomplished by A. Because of refrigerant glide, the refrigerant entering the evaporator for a specific suction pressure is approximately 10 F colder than the refrigerant vapor at the outlet of the evaporator (not. Standing pressure ( system not running ) will depend on surrounding temperature of outdoor unit. Check for restrictions in the discharge line, overcharge of refrigerant or a faulty component. As an air-conditioning refrigerant in newer automobiles, the optimal running pressure for R134A is between 22 and 57 pounds per square inch. 12-36 -38 17. refrigerant flow, low head pressure generally causes insufficient refrigerant to be fed to the evaporator. 3 psig R404A (-22º) suction 15 psig Resulting pressure drop = (16. The discharge pressure will abnormally raise and high pressure cut out will take in action. Clean walk-in cooler and walk-in freezer condenser coils. Compressor operation is possible within the limits shown on the diagrams of application. 0 40°c 60°c 80°c 10000 1000 100 10 1 35 30 25 20 15 10 5 0-25-25 0 0 25 25 50 50 75 75 100 100 pressure temperature bar °c °c 100% 90% 80% kinematic viscosity 70% temperature. Diameter, mm. suction line (larger refrigerant line) pressure tap. 7 equals 250 PSIA and the suction pressure 35. Close valve on the R407C supply cylinder and close valves on manifold gauge. pressure control must be used in all applications. refrigerants that are already used thousands of times in many mo-bile and stationary applications. R407C (HFC). Pressure drop should not cause: • vapour formation in line • insufficient liquid pressure at DX device. R407C pressure/temperature chart for operation and superheat (discharge/hot gas and suction. Honeywell Genetron® Refrigerant R422D offers a non-ozone-depleting HFC. Take up the quiz below and see how good you are as a refrigerant machine operator. The same minimum gas velocities of 500 fpm in horizontal runs and 1,000 fpm in vertical runs with upward gas flow are observed. ZH Series Copeland Scroll Compressors model ZH21K4E-TFD,r134a/r407c refrigeration compressor copeland usa, US $ 333. For R-404A Low Temperature 1 psi; for R-404A and R-22 Medium Temperature 2 psi is used. Take a reading of your refrigerant system pressure (PSIG). 0 Psi For the high side R-1270 compressor: Suction pressure drop: 0. Refrigerant price / availability R-407C Refrigeration Replacements R-404A Suction Pressure (psi) Discharge Pressure (psi). R407C Copeland Compressor,zr copeland scroll compressor, 30hp copeland compressor ZR380KCE-TWD-522, US $ 2222. Locating the suction side service valve. gas inlet pressure in. Suction pipe is designed for 5psi of refrigerant pressure drop and additional refrigerant heating by 12. Returnable cylinders containing. High pressure above max operation range of the pressure switch. For air conditioning system, R22 pressure in discharge is250psi and suction in67psi. Then the incoming temperature of the compressor, as determined by the leaving temperature of the evaporator, is used as the starting point of the compressor, as shown by point B' on the figure below. Product Description: 6mm Nominal Bore Atmospheric Discharge Safety Relief Valve for Refrigerants Notes: Relieving pressure. Reclaim excess refrigerant. The evaporating pressure is the pressure at which the refrigerant is phase changing from a liquid to a vapor. Kothandaraman Refrigerant Tables and Charts, Including Air Conditioning Data C. The region to the left of the envelope represents liquid in a subcooled condition. Please note the coloured areas. Please log back in to continue. This pressure tap may be located on the inside of the cabinet. Scroll compressors utilize two offset spiral disks allowing for concurrent suction, compression and discharge cycles as the gas passes through the mechanism. With the suction solenoid (4) closed, the liquid refrigerant flows through the holdback valve (H) which controls the rate of refrigerant flow and the pressure in the bank. When the seal line reaches the discharge end, the refrigerant in the tooth space is. Reduce the minimum condensing temperature set point to save energy when outside temperatures are below the existing approach temperature. suction accumulators are finished with corrosion-resistant powder paint suitable for most harsh environments. Systems operating on R410A run at a pressure of about 1. Products Refrigeration Equipment. Reed valves allow refrigerant into and out of each cylinder as the piston travels up and down the cylinder wall. ) on the p/t chart for 407c? ummternary blend i believe with a temp glide of about 10 deg f and uses poe. By contrast, an electronic HGBP valve can regulate bypass flow to maintain the desired suction pressure or discharge air temperature. ft of the nominal charge at suction. Suitable refrigeration oils are ester oils, such as Fuchs Reniso SE55. 407a pt chart r22 suction pressure temperature chart r22 refrigerant pressure temperature calculator 407c superheat chart how to read a pt chart r407c refrigerant suction pressure discharge pressure r407c refrigerant ideal pressure 407c pt chart and bubble point. Suction and liquid service valves Fan speed head pressure control Low ambient start timer 3 minute delay timer / random start timer… Outdoor Unit 1ph CKC R407C | Marstair CKC20 R407C O/D 1PH | HRP - refrigeration & air conditioning. If the high side AC hose is damaged, it could result in the loss of refrigerant. 12-36 -38 17. • A helix tube in tube water-cooled condenser is standard with refrigerant counter. $ Circulating fluid. LP cut out Operate the solenoid valve is closed when the cool room temperature reach its desired temperature (setting temperature). Pump the refrigerant into the condenser coil by running the compressor with the liquid service valve closed. The bank becomes an evaporator and absorbs the stored heat. Dirty Condenser coil. Genetron 407C or 422D it is important to remember that these are blend refrigerants. Please log back in to continue. This test consists of 100 most important questions that will help you clear the certification exam of the same. Performance Measurements and Mapping of a R-407C Vapor Injection Scroll Compressor View the table of contents for this issue, or go to the journal homepage for more 2017 IOP Conf. refrigerant directly out of the system and transfer it into a recovery cylinder. [email protected] cut-out; 250 p. R-407C exhibits higher pressures than R-22 at normal condensing temperatures. INSTALLATION DIMENSIONS OUTLET INLET AMMONIA PRESSURE-RELIEF VALVES Cat No. The bubble pressure is used for determining the system pressure when the refrigerant is in a saturated liquid or subcooled. 18-20psig suction. wg (hi fire) refrigerant suction, circuit 1 psig f refrigerant suction, circuit 2 psig f refrigerant discharge, circuit 1 psig f refrigerant discharge, circuit 2 psig f j verify that 3-phase fan motor and blower are rotating in correct direction. Compressor reed valves are thin steel flaps fastened to the valve plate. Discharge pressure (also called high side pressure or head pressure) is the pressure generated on the output side of a gas compressor in a refrigeration or air conditioning system. As an example, in Figure 2, with gauges installed only at the suction and discharge of the compressor and reading as indicated, a significant pressure drop through the evaporator would be indicated by a high temperature of, say, 50°F (10°C) measured at the evaporator inlet which would correspond to a pressure at that point of approximately 45. Section 3; Removing refrigerant. High compression ratios can be caused by either low suction pressure, high head pressure, or a combination of the two. Discharge temperature. The adoption of an intercooler (IC) can solve this issue. Your session was interrupted. An increase in motor current indicates that the kinetic energy in the moving parts of the compressor – dominated by the pistons - is not sufficient for a smooth pull-through at the point of highest torque. Vapour Pressure: 10. refrigeration and air conditioning systems to give protection against excessively low suction pressure or excessively high discharge pressure. 0 40°c 60°c 80°c 10000 1000 100 10 1 35 30 25 20 15 10 5 0-25-25 0 0 25 25 50 50 75 75 100 100 pressure temperature bar °c °c 100% 90% 80% kinematic viscosity 70% temperature. You are reading low on the suction. Cut in pressure is set an equivalent coil temperature of 35F, that is between 60 and 61 psig, (refer to the chart I attached) Start cut out temperature at 20 psig, run the system until the box is at 35F, the raise the suction pressure cut out until the unit goes off. HEAD PRESSURE - Pressure of refrigerant from discharge reed valve through lines and condenser to expansion valve orifice. Condenser, Air Cooled. Condenser fan failure. If your freezer is stable at -2F, the evap coil should be only a few degrees cooler than that, so your low side pressure should really be something like 2-6 PSIG. 4 Safety Instructions. 250-270 psig discharge. The pressure above the valve set point at which the piston is fully open depends on the valve design. 3°C) condensing temperature Charging a Unit with Freon™ 407C As with any other refrigerant blend, when charging equipment with Freon™ 407C, remove liquid refrigerant from the cylinder to charge the unit. Do not pour liquid refrigerant through the suction line valve on the compressor. R407C R134a R404A Working pressure range high side bar (g) 7. ✅ Browse our daily deals for even more savings! ✅ Free shipping on many items!. R-407C, also has another disadvantage as compared to R-22. You are reading low on the suction. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. The bubble pressure is used. Feel free to contact us via phone, email or just send us mail. The mass flow rate of refrigerant in compressor m k , in kg/m 3 , depended on the working capacity of compressor V k , in m 3 , the capacity efficiency of compressor η ck , and the specific. R407C R422D. Not all evaporators have a suction service port. The AC Refrigerant pressure switch monitors the pressure inside the AC system. 11 Btu per pound of refrigerant. Defective overload protector. Use the recovery-unit manufacturer's refrigerant table, found on a sticker located on the side of the recovery unit, to find the proper amount of vacuum for the type of refrigerant in the air conditioning system. High pressure side is high, low pressure side (suction pressure) is low: Discharge pressure is very high after turning on the A/C switch, and bubbles are seen in the sight glass (if charge valve is located after R/D, discharge pressure is unknown)-----Choking between compressor and R/D: Remove clogged materials, or replace condenser. An extremely high discharge pressure coupled with an extremely low suction pressure is an indicator of a refrigerant restriction. For example, if there was to be an 8 psi (56kPa) pressure drop in discharge line of an NH3. If the actual refrigerant temperature. OPERATING PRESSURE POINTS “Systems using R-410A operate at higher pressures [than R-22],” points out the Field Diagnostics team. The pressure-relief valve will discharge in the event of a fault such as a power failure. Check the performance charts of the compressor for the maximum suction pressure. ×Alternative for risk management in refrigeration systems in occupied spaces: according to RSIF 2019 IF04 Appendix 4. Here again, the compressor can only pump what it can see so it must work harder, therefore, higher heat of compression is generated in compressing a low suction pressure to a suitable condensing pressure. en To avoid suction or discharge pressure faults and to help prevent slugs of liquid refrigerant from entering the heat pump's compressor as the heat pump switches between heating and cooling modes or switches between heating and defrost modes, the control scheme provides momentary periods of. R-407C is a hydrofluorocarbon (HFC) alternative for R-22 in positive. v Compressor motor current percent limit. Example: A pressure of250 psig is measured at the condenser outlet. Medium pressure chamber and low pressure chamber keep compressing and suction continuously. Condenser, Air Cooled. •Measure the Suction line temperature •Find the Dew point temperature from the Low pressure gage and subtract from Suction Line temperature •You now have the subcooling •Example 407C –Measured liquid line temperature is 44. panel which shows the suction and discharge pressure. Please log back in to continue. Vapor recovery can be done by connecting to the system suction service port (low pressure) side of the system. high pressure refrigerant flow line. In the operating refrigeration equipment, R22 refrigerant can be substituted for R407C with the use of simple After pressures in the system and ballon become equal, the residue refrigerant is delivered to the Usually increasing of discharge pressure compared to that of R22 constitutes 103276kPa. Excessive suction or discharge pressure. These hermetic reciprocating compressor use pistons driven by a crankshaft to deliver refrigerant at high pressure from the low side to the high side… AJ - R407C | Tecumseh AJ5512C Compressor R407C 1PH T/T PSC | HRP - refrigeration & air conditioning. One of the very first steps when it comes to diagnosing your home air conditioner, refrigerator, or even your vehicle's air conditioner is understanding the temperature and the current pressure that your system is. ICEAGE FDF series suction line filter driers are used to protect the compressor from dirt and all solid contaminants. Environmental Protection Agency, states that R134A is not flammable at ambient temperatures and not corrosive to metals such as aluminum. KP pressure controls are optimized for food retail refrigeration applications providing the excellent protection against low suction pressure or high discharge pressure. 5 The maximum length of the piping is 50 m. Pressure relief valves are designed and engineered to provide high-volume discharge primarily for use on liquid receiver applications above the liquid refrigerant level. This will prevent the refrigerant, in the event of compressor shutdown, from flowing back down the discharge pipe to the compressor and damaging it at the next start-up and/or preventing normal operation by causing a high-pressure blockage. At what pressure does the High Pressure Switch open on an R-410A? 610 psig, plus or minus 10 psig. High discharge pressure. Higher suction pressure is better as it leads to smaller compressor displacement• b) Discharge pressure: At a given condenser temperature, the discharge pressure should be as small as possible to allow light- weight construction of compressor, condenser etc. SIZE D E INLET OUTLET SRV 1520 15mm X 20mm 66 125 ½ FPT ¾ FPT. As an air-conditioning refrigerant in newer automobiles, the optimal running pressure for R134A is between 22 and 57 pounds per square inch. For single refrigerants such as R22 and R134A, the isot hermal line has no gradient in the saturated area, that is, the saturation temperature under certain pressure is the same at both the liquid side and the gas side. The refrigerant R134a Especially in the area of normal refrigeration for supermarket appli-cations numerous studies have shown that R134a as a refrigerant contributes to a very high efficiency of the system. Kothandaraman Refrigerant Tables and Charts, Including Air Conditioning Data C. DuPont Chemous Refrigerant MO29 R422D (R22 R-22 R-407C R-417A Substitute) 25 Lbs MO29 R422D (R22 R-22 R-407C R-417A Substitute) 25 Lbs Sealed Jug FREON 422D (R-422D) R-22 RETROFIT SOLUTION, DUPONT R422D Retrofit Your R-22 A/C or Refrigeration System Today with this "drop-in" replacement, R422D. Maximum allowable discharge pressure drop is 3 psi per minute after initial drop of 10 to 15 psi in first half minute. 1 Refrigerants 3. Suction pressure. Refrigerant Pressure - Temperature Chart Use the Open or Close icons to see the descriptions below with the icons. Refrigerant. 1 Refrigerants 3. gas inlet pressure in. - defrost discharge pressure control; 300 p. So, the technician must measure the. Your session was interrupted. The bank becomes an evaporator and absorbs the stored heat. Suction Pressure Gauge Discharge Pressure Gauge Filtration Shut-Off Valves Construction Overload Protection High Pressure Shut-Off Refrigerants Flow Rate (at 60hz, reduce 15% for 50hz) Direct Vapor Direct Liquid Push-Pull Liquid-30” hg to 350 psig -1 to 34. Displacements and Line Sizes SUCTION DISPLACEMENT LINE SIZES MODEL 60 HZ 50 HZ SUCTION DISCHARGE 1111 118 CFM 167 M3/HR 2 5/8” ODS 2 1/8” ODS. For refrigerants other than R-22, plug in the matching Refrigerant Key. The internal pressure relief valve is located between the high and low side of the compressor. Condenser, Air Cooled. For other saturated suction temperatures with 8. Emerson Liebert Challenger 3000 Manual Online: R407c Refrigerant, Table 33 R407c Pressure/temperature Chart For Operation And Superheat. Adding 2 psig for pressure drop in the coil, the true outlet pressure is 120. ·Use pressure performance of 5. 12-36 -38 17. 7 equals 50 PSIA. Refrigerant under pressure must never be discharged to the atmosphere. Alternative refrigerants (overview). Diameter, mm. LPS (Low-Pressure Switch) If the pressure at the suction side of the compressor becomes abnormally low, the LPS stops the unit automatically in order to prevent The purpose of the gas shortage function is to detect refrigerant shortage before the unit stops due to a discharge temperature that is too high. The pressures are basically the same, but the thinner air will cause the operating pressures of an air conditioner to have a reduction in pressure. Returnable cylinders containing. Discharge Pressure P. An IC can be located between the 1st discharge and the 2nd suction. The region to the left of the envelope represents liquid in a subcooled condition. toward compressor (horizontal) - You only need to figure suction riser if compressor is above the evaporator. Using the vacuum created by the evacuation procedure, charge the unit by weight with liquid R407C refrigerant through the discharge and liquid lines until the pressure stabilizes 26. •Measure the Suction line temperature •Find the Dew point temperature from the Low pressure gage and subtract from Suction Line temperature •You now have the subcooling •Example 407C –Measured liquid line temperature is 44. Particular attention should be paid when specifying copper in conjunction with newer, high-pressure refrigerants (e. to keep Freonâ„¢ 407C on hand to ensure that you are prepared to. Products Refrigeration Equipment. Suction and liquid service valves Fan speed head pressure control Low ambient start timer 3 minute delay timer / random start timer… Outdoor Unit 1ph CKC R407C | Marstair CKC20 R407C O/D 1PH | HRP - refrigeration & air conditioning. Low suction pressure. Environmental Protection Agency, states that R134A is not flammable at ambient temperatures and not corrosive to metals such as aluminum. The seal line advances toward the discharge side, tooth space is reduced, and compression is performed. Design pressure: 370 psi for standard single and two stage compressors / 580 and 725 psi for high pressure compressors. Returnable cylinders containing. Systems that use a low pressure controller to maintain space temperature may need to have the cut in and cut out points changed. R407C Refrigerant. pressure control must be used in all applications. should incorporate the hot gas bypass option. Use either synthetic oil or blend of AB/MO with AB>50%. Excessive suction or discharge pressure. Any system using hot gas for compres-sor capacity control must have a nor-mal head pressure to operate properly. #100, Miami, FL 33172 USA Ph: +1-305-406. If we convert the head and suction pressures to saturated temperatures, the results are a condensing temp of 110F in the outdoor (condenser) coil and a boiling temp of 45F degrees for the liquid refrigerant in the indoor (evaporator) coil, giving us 10F degrees of subcooling, and 10F degrees superheat. Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. You must draw from the charging cylinder as a liquid or you will destroy the proper. adding heat with circulated hot water or heating blankets. closing the suction service valve. 0 40°c 60°c 80°c 10000 1000 100 10 1 35 30 25 20 15 10 5 0-25-25 0 0 25 25 50 50 75 75 100 100 pressure temperature bar °c °c 100% 90% 80% kinematic viscosity 70% temperature. Refrigerant vapour pressure drop in discharge line after the compressor and in liquid line after the condenser are negligible. Your session was interrupted. Best for applications with >0 °F suction. 7 lb/min (14. E heating air source heat pump ion about bubble dew points dupont suva refrigerants dupont suva refrigerants r407c suction and discharge pressureForane 407c Pressure Temperature ChartRefrigerant Pressure Temperature Chart R407c R410a R134a R404aTemperature Pressure Chart For R 22 410a 407c 134a And404a Pt Chart Gallery Of 2019Dew Point BubbleChecking Superheat Or Sub Cooling Figuring Coil […]. Vapor recovery can be done by connecting to the system suction service port (low pressure) side of the system. At the end of the evacuation process, the vacuum should be < 1. 294MPa, recover refrigerant inside the oil trap kit to reduce the Before removing the oil trap kit after flush-ing operation, make sure to discharge and process the oil Precautions for Devices that Use R407C Refrigerant Caution. For air conditioning system, R22 pressure in discharge is250psi and suction in67psi. Pressure controls for refrigeration compressors. •Measure the Suction line temperature •Find the Dew point temperature from the Low pressure gage and subtract from Suction Line temperature •You now have the subcooling •Example 407C –Measured liquid line temperature is 44. Suction Catch-All. Refrigerant pressure readings R-22, R-410A, R-290, R-417A R-22 Standing pressure - 150 PSI Saction pressure - 60 TO 70 PSI Discha. Pressure Temperature Chart 800. Min discharge line temperature (outside): It must be ensured by sufficient suction superheat that the discharge gas temperature is at least: 54°F above condensing tem p when using R22 and R407C and at least 36°F above condensing temperature for refrigerants R134A, R404A and R507A. Let's say a system has 45 psi suction pressure (converts to 22F) and 68F suction line temperature, the superheat is 46F (68. R-407C Pressure Chart. A throttling valve should be used to control the flow of refrigerant to the suction side to ensure that the liquid is converted to vapor prior to entering the system. Compare it to the SATURATED LIQUID (Bubble Point) TABLES. After the EES model is verified by comparison to the experimental study, the model is used to predict refrigeration cycle behavior in the case of the heat exchanger component geometry being slightly altered. Suction Filter. The temperature at which system refrigerant will condense in the condenser; this temperature corresponds to the high side pressure in the system on a pressure/temperature chart. of circuits Evaporator water inlet/outlet High discharge pressure (pressure switch). The suction pressure drops and the compressor unloads. The discharge pressure is affected by several factors: size and speed of the condenser fan. From the top dead center position the piston starts moving towards the downward direction. Change in Discharge Pressure, psi (kPa) 17 (117) 17 (117) *Chemours calculations **Assumes 110°F (43. With R-410A, the same unit will operate under the same conditions with a suction pressure of 118 psi and a discharge pressure of 400 psi, as shown in Figure 1 on the next page. Pressure Temperature Chart 800. Condenser, Air Cooled. suction accumulators available in standard sizes and volumes, to make your transition to R410A as seamless as possible. Particular attention should be paid when specifying copper in conjunction with newer, high-pressure refrigerants (e. Dupony input condition of the expansion device is determined by the condenser. Charged low-pressure refrigeration machines may be most efficiently leak checked by; A. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. This may require adjusting the high pressure safety controls to operate as intended. • R-407C, R-134A and other green friendly refrigerants Maximum Safety and Reliability • Flow switch to protect from process blockage and no flow condition • NEMA 12 rated electrical enclosure • Low and high refrigerant pressure safety devices • Main power disconnect • General fault and individual system alarms including freezestat,. - defrost discharge pressure control; 300 p. It also can be used to maintain the pressure. Items listed are different for refrigeration like walk in and reach in coolers freezers. The entire refrigerant is now held between the discharge valves of the compressor and the liquid line solenoid valve. By cooling the intermediate pressure refrigerant after the 1st stage discharge, the final discharge temperature can be reduced. refrigerant flow, low head pressure generally causes insufficient refrigerant to be fed to the evaporator. The first stage compression group provides cooling at a lower temperature while the second stage compression group provides cooling at a medium temperature. Similarly Joudi et al. The bubble pressure is used for determining the system pressure when the refrigerant is in a saturated liquid or subcooled. The present research is concerned with the study of the effect of HFC refrigerant R407C on the vapour compression. Condenser, Air Cooled. The Different Types of Cooling Compressors A compressor acts as the “heart” of a refrigerant-based mechanical cooling system. If the units are further apart However, for discharge pipe temperature abnormal and high pressure abnormal, the LED lamp lights continuously for 24 hours, as long as the. Compressor power decreases with pressure difference across the compressor. Maximum allowable discharge pressure drop is 3 psi per minute after initial drop of 10 to 15 psi in first half minute. Your session was interrupted. Products Refrigeration Equipment. By contrast, an electronic HGBP valve can regulate bypass flow to maintain the desired suction pressure or discharge air temperature. Composition. 5 ton I understand. Resistant to minor slugs of oil and refrigerants due to robust construction including spring loaded safety heads. Ensure no foaming takes place, renew the oil if required. This poses a risk to product quality, integrity, and safety. R-134A is a refrigerant frequently used in automobile air conditioning. R410A is an HFC refrigerant, invented by Honeywell, that has been developed to replace the HCFC refrigerant R22. Standing pressure ( system not running ) will depend on surrounding temperature of outdoor unit. It opens at 2. Insufficient refrigerant in system. For instance, what are the typical high and low side pressures on a properly charged system for: R-22 on a 1 ton R-22 on a 1. Low suction pressure. An extremely high discharge pressure coupled with an extremely low suction pressure is an indicator of a refrigerant restriction. The bubble pressure is used. Products Refrigeration Equipment. HIGH PRESSURE will be denoted by the word HIGH printed in BLACK letters. R-407C exhibits higher pressures than R-22 at normal condensing temperatures. 3°C) condensing temperature Charging a Unit with Freon™ 407C As with any other refrigerant blend, when charging equipment with Freon™ 407C, remove liquid refrigerant from the cylinder to charge the unit. Qualified refrigerants R22 R407C, R134a, R22 R410A Copeland® Brand. Displacements and Line Sizes SUCTION DISPLACEMENT LINE SIZES MODEL 60 HZ 50 HZ SUCTION DISCHARGE 1111 118 CFM 167 M3/HR 2 5/8” ODS 2 1/8” ODS. wg (low fire) in. An R410A heat hump operating in the heating mode has a suction pressure of 85 psig and head pressure of 385 psig. With R-410A, the same unit will operate under the same conditions with a suction pressure of 118 psi and a discharge pressure of 400 psi, as shown in Figure 1 on the next page.