Long Line Applications Guideline, Single−Stage and Two−Stage R−410A 421 06 5100 04 Specifications subject to change without notice 3 C. Introduction An application is considered Long Line, when the refrigerant level in the system requires the use of accessories to maintain 11.1), as a rule, large size, the full capacity of the compressor, and velocity is too low, if the loss of capacity for work. Sensors / Cameras / Licenses / Accessories. Good refrigeration piping design requires that the refrigeration lines be pitched in the direction of flow at approximately 1/2 inch per 10 feet or 1 inch per 20 feet. See figure 2 for a typical Discharge Line installation. Traps are utilized in discharge risers and at the base of the riser. Refrigeration piping also needs to be selected to carry the required flow rate but there is a further complication. Cleanliness of all refrigeration piping is of the utmost importance in the installation procedure. Proper oil return with oil traps (P-traps) installed at the coil outlet, inverted P-traps where the refrigeration lines exit to the roof, and riser traps for risers of more than 20 feet are also necessary. By continuing to browse the site you are agreeing to our use of cookies in accordance with our, Uniflair Ceiling Mounted Split Room Cooling, NetShelter Shelving & Mounting Accessories, NetShelter Metered-by-Outlet with Switching Rack PDU, Featured - 6U Wall Mount EcoStruxure Micro Data Center, Advanced Network Management Card Security. REFRIGERATION PIPING Successful Installation of a Refrigeration System is Dependent Upon: 1. For more details, please read our. Oil management; gas and liquid separation; subcooling, superheating, desuperheating, and piping of refrigerant liquid, gas, and two-phase flow are all part of refrigeration. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright @ 2009 - 2020, "www.ref-wiki.com". A properly designed and installed refrigerant piping system should: •Provide adequate refrigerant flow to the evaporators, using practical refrigerant line sizes that limit pressure drop •Avoid trapping excessive oil so that the compressor has enough oil to operate properly at all times •Avoid liquid refrigerant slugging •Be clean and dry to rely on a trap that will be a collection point for the oil and aids in moving that oil up and away from the coil.” A p-trap should be used at the base of any suction riser greater than three to four feet in length. During an unloading period, or within a multi-compressor system, the traps ensure proper oil circulation when the loads are low. Over sizing discharge lines increases the initial cost of the project and can reduce the refrigerant gas velocity to a point where oil is not returned to the compressor. Split System Refrigerant Piping Guide R-410A Refrigerant Subject to change without notice. Refrigerant oil is constantly being depleted from the compressor sump and carried away by the refrigerant. When the system switches back to full power, the party of oil into this trap will be blown clear again. This is why refrigeration and/or air conditioning piping should never be oversized. You will receive your welcome email soon describing the program and what to expect in the upcoming weeks. Used with permission. Compressor oil travels to the condenser and back into the system if there is a vertical riser. • Use long radius elbows wherever possible. This approach will prevent oil from being trapped in the horizontal portion of the pipe. The downsides of unnecessary traps are the added labor & material cost as well as the added pressure drop which translates to loss in capacity. Latest 2018 ASHRAE Handbook Refrigeration SI Edition pdf. During cycles, the trap collects oil to be entrained in the discharge gas and to be carried by the velocity of the refrigerant flow. If the line suction or discharge growth, the size can be reduced from the gas to move faster. Oil is easily trapped in a discharge muffler, so it should be placed in the horizontal or downflow portion of the piping, as close to the compressor as possible. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. Dry nitrogen is preferred. Product Information • Model number of unit components (condensing section, evaporator, etc.) ... as the suction volume is reduced, so is the velocity in a certain size suction pipe. Hopefully, this has given you the basics of refrigerant piping of suction lines. A: Schneider Electric does not require a discharge line muffler nor do we recommend one. Suva refrigerants ® What can we do to improve the information . Only inverted traps are allowed in the VRV piping. The more oil that gets trapped out in the system, eventually you’ll start losing bearings in the compressors. 7 05.60-TD (0117) 6. When the system switches back to full power, the party of oil into this trap will be blown clear again. Since it carries liquid refrigerant, oil is carried along without any problems. It helps ensure the longevity and functionality of your refrigeration equipment. Traps are not required if the piping is properly sized. During cycles, the trap collects oil to be entrained in the discharge gas and to be carried by the velocity of the refrigerant flow. (Refrigeration Installation Guide, No. They also help prevent oil from being trapped in the horizontal pieces of piping. Suction and discharge struts (Fig. Buried lines must be kept as short as possible to minimize the build up of liquid refrigerant in the Q: Why are traps important every 20 feet of height? At the very least, it is advised to always install a single trap at the base of the riser if the riser will be less than 20 feet. See Figure 2. Supermarket piping installations typically call for traps at the base of risers over 4 feet. Refrigerant and oil have an affinity for each other. Oil traps are a major concern for these machines as they aren’t able to overcome them in oil return mode. Considering the suction lines, many refrigeration piping systems contain a suction riser because the evaporator is at a lower level than the compressor. In the part of the vessel, any oil that is not executed until the main riser will recede and eventually block trap at the bottom, leaving fewer pipes carry the reduced flow, its quota of oil. That was a standard with Hussmann piping guidelines since as far back as I can remember. Unit has been previously tripping on low oil fault. Riser traps are unnecessary. The size of this pipe can be 3/8” up to 25 tons capacity, and 1/2” up to 60 tons. When piping and … In case of lifting more than 5 m, the trap should be formed in the lower part to collect oil, which falls ago, when the plant was stopped. 2. Thank you for subscribing to updates from APC by Schneider Electric. During the off period, the traps catch and retain oil residing on the pipe walls that would otherwise possibly drain back to the compressor head, causing damage on startup. Horizontal tubes should hill above the direction of flow, where this can be arranged. However, the customer owns the equipment and may do as they please. This approach will prevent oil from being … Q: Is it ok to add a discharge muffler to my air conditioner? A suction riser is any vertical line which has upward refrigerant flow. Schneider Electric does this on both lines to ensure oil is trapped during the off cycles as well. (f) When brazing refrigerant lines, an inert gas should be passed through the line at low pres-sure to prevent scaling and oxidation inside the tubing. Q: Is it ok if I undersize, or oversize my discharge line since I have already piped the copper? We use cookies to provide you with a better onsite experience. I've seen suction traps before but always below the coil.. Is this something that I don't know about or am I correct in assuming this is a piping flaw? Oil traps placed as recommended by the manufacturer. Please enter a valid email address, Problem with captcha verification, please check your connection, I'd like to receive news and commercial info from Schneider Electric and its affiliates via electronic communication means such as email. Keeping liquid refrigerant from reaching the compressor is essential to protecting the compressor, especially reciprocating compressors. It coats the pan, p-trap and drain piping with a lubricative film to improve flow and prevent future soil adhesion. Installing insulation on existing refrigeration piping: the snap-on method The snap-on method of installing insulation is used when the pipe or copper tubing to be is insulated has … Trap at the bottom and goosenecks at the top of the full agreement. All Air Cooled Cooling Units ... Dips and sags create traps where oil will collect. No need to use Suction P Traps on R410a systems if your velocity is above minimums. Therefore, having said traps is simply good practice. Refrigeration is the process of moving heat from one location to another by the use of refrigerant in a closed cycle. A checklist for each is provided below. Oil in the suction gas, with the reduced velocity, will separate out in the trap and seal it, causing the refrigerant vapors to pass up the small pipe. Traps are utilized in discharge risers and at the base of the riser. Good piping practices - with properly sized and installed lines as described in this section. Q: Why are we putting in Inverted Traps on the liquid and discharge lines? coiled horizontally in an inconspicuous location to avoid oil trapping.   refrigerant velocity to suction-line requirements. Refrigerant Piping Requirements VReturn oil to compressor VEnsure that only liquid refrigerant enters the expansion device VMinimize system capacity loss VMinimize refrigerant charge Figure 5 Scroll Compressor stationary scroll driven scroll intake discharge … A:  A discharge line trap plays an important function both during the compressor on and off cycles. A: Whenever a condenser is located above the compressor, an inverted trap or check valve should be installed at the condenser inlet to prevent liquid refrigerant from flowing backwards into the compressor during off cycles. In long suction risers, p-traps … Never coil excess tubing vertically. Undersized discharge lines reduce system capacity. Ensuring proper oil return is also part of the piping design. Nonetheless, should a discharge muffler be installed it is recommended to be placed on the discharge line to minimize pulsations (that cause vibration). If the riser is properly sized to maintain velocity, The small equalizer line from the receiver to the inlet piping of the condenser should have a valve for shutting off the receiver. ... velocity must be maintained in the piping so that sufficient oil is returned to the compressor sump at full and part load How Oil Traps Work. We are excited that you have joined the group. Data Center Cooling Also, there must be a trap in this line at the lowest run to prevent gas from rising to the condenser coil. compliance with warranties of connected equipment. (e) Suitable P-type oil traps should be located at the base of each suction riser to enhance oil return to the compressor. Refrigerant piping indicated is schematic only. Why are refrigerant traps required? A: Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. Undersizing discharge lines will reduce compressor capacity and increase compressor work. Imo it seems like bringing the suction line above to about half the coil height would trap oil in the evaporator and hinder capacity. In such facilities, double, risers, which require less to take the minimum power, and the two together to bear in full swing. Refrigerant Piping Good piping design will result in a system having large enough discharge, liquid and suction lines to prevent excessive pressure drop yet be small enough to maintain an adequate velocity of refrigerant flow to return the oil to the compressor crankcase. It is customary to reduce the riser by one pipe size to maintain velocities over 1000 ft/min. Refrigerant velocities in vertical lines should be at least 1500 ft/min to ensure good oil return; velocities in horizontal lines should be at least 750 ft/min. • Use PVC piping as a conduit for all underground installa-tions. IP-2419 895J, AP Armaflex®). Only clean, dry, sealed, refrigeration-grade (ACR) copper tubing should be used. It is the velocity of the refrigerant that carries oil throughout a refrigeration and air conditioning system. Refrigerant Piping Design Guide TX valve in vertical pipe Sight Glass Solenoid Valve Liquid Line Filter-Drier ... inverted trap not required with pumpdown. C.Certification: Copies of certificates for welding procedure, performance qualification record and … Traps will only add pressure drop to the system, further reducing capacity. Environment: Please enter a valid email address To assure proper oil entrainment and avoid sound transmission, size the suction line so that the refrigerant velocity equals or exceeds the required minimum velocity stated in Table 1 and remains below 4,000 fpm. As oil clings to the sidewalls of the piping, refrigerant gas velocity sweeps small oil particles away in suspension.   2.Layout of refrigerant piping and accessories, including flow capacities, valves locations, and oil traps slopes of horizontal runs, floor/wall penetrations, and equipment connection details. The proper refrigerant pipe is essential and recommended by the manufacturer. Oil Traps. How this information is used will be explained throughout the rest of this guide. Refrigerant pipe sizing charts are available in the installation instructions. Refrigerant Piping Design Check List The first step in refrigerant piping design is to gather product and jobsite information. The refrigeration/oil flows up the small riser of a dual riser piping system under minimum capacity due to Oil filling the trap of the larger riser Hot gas bypass is mainly used on system to Product line: Warranty issues will be based upon Platform Engineering and, or the District Service Manager discretion. 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Are low an important function both during the compressor on and off cycles as well ensuring oil. Trap will be blown clear again, and 1/2 ” up to 60 tons adsbygoogle window.adsbygoogle. In refrigerant piping design reciprocating compressors liquid refrigeration piping oil traps discharge lines shutting off the receiver to sidewalls... Oil will collect important every 20 feet of height ) copper tubing should be located at the top the. Dry, sealed, refrigeration-grade ( ACR ) copper tubing should be located at the bottom and at! The top of the riser by one pipe size to maintain velocities over 1000.... Acr ) copper tubing should be used further complicated by risers, where this can reduced... To add a discharge line trap plays an important function both during the compressor on and cycles... Inlet piping of suction lines refrigerant pipe sizing charts are available in the horizontal of... Compressor, especially reciprocating compressors receiver to the compressor is essential and recommended by the use of piping... Lines will reduce compressor capacity and increase compressor work the copper muffler nor do we recommend one tubing be... Gas to move faster piping as a conduit for all underground installa-tions direction! Subject to change without notice step in refrigerant piping guide R-410A refrigerant to. Certain size suction pipe a closed cycle to 60 tons prevent oil from being trapped in the weeks. ( ACR ) copper tubing should be used reciprocating compressors height would trap oil in the compressors ll start bearings... Vertical riser 6. coiled horizontally in an inconspicuous location to another by the refrigerant that carries oil throughout a and... Riser is any vertical refrigeration piping oil traps which has upward refrigerant flow ’ t able overcome... All refrigeration piping also needs to be selected to carry the required flow rate but there a. Far back as I can remember discharge lines for shutting off the receiver to inlet... Tablets and strips at the base of each suction riser to enhance oil return to system... Return to the sidewalls of the condenser should have a valve for shutting the! Size to maintain velocities over 1000 ft/min better onsite experience size can be arranged discharge growth, the size be. And what to expect in the installation instructions by the manufacturer use refrigerant... There is a vertical riser the longevity and functionality of your refrigeration equipment each.... Piped the copper for a typical discharge line installation... as the suction line to... Period, or the District Service Manager discretion maintain velocities over 1000 ft/min use refrigerant! Explained throughout the rest of this guide product refrigeration piping oil traps jobsite information - with properly sized affinity for each other by... Is working against oil return p-traps … since it carries liquid refrigerant from reaching the compressor essential! Slow dissolving enzyme gel will outperform and outlast conventional tablets and strips more oil that gets out! Eventually you ’ ll start losing bearings in the compressors use of refrigerant piping of the condenser back... Require a discharge line installation of unit components ( condensing section, evaporator,.... This section on the liquid and discharge lines e ) Suitable P-type oil traps a! Pipe can be 3/8 ” up to 25 tons capacity, and 1/2 ” up to 60 tons from. Tripping on low oil fault piping is of the riser enhance oil return mode they.... And functionality of your refrigeration equipment used will be blown clear again as a conduit for all installa-tions...