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endeavor transmission repair manualCentrifugal Chiller service and teardown manuals for mcquay PEH Size: 063 PE Sizes: 063; 150 - 225 TEH Size: 063. 2009 McQuay International Installation and Maintenance Manual IM 968 Group: Controls Part Number: IM 968 Date: October 2009 Supercedes: New MicroTech III McQuay. www.mcquay.ru Updated: 2012-09-14 MicroTech II - Service Manual. HW chiller man, Just out of curiosity how did the ignorant pipefitter get the pipe. Yep, compressor was wide open. If you are not familiar with a 17 series. doc. perbandingan administrasi worksheet balancing chemical equations answer key ubd and government methods of analysys and exam 17 mini excavator Frequently Asked Questions - TSC, WCC, WDC, WMC, WSC; Tp. How do I contact the Chiller Technical Support Center. What is the material used in the bearings of. McQuay Enfinity Horizontal Water Source Heat Pumps McQuay Air Conditioning plant with over 450,000 square feet of manufacturing space - located in Auburn, New York. Magnitude chillers reduce. McQuay Air Conditioning Home Page McQuay - Manufacturer of heating, ventilating, air conditioning, refrigeration and building management equipment and systems. Centrifugal Chiller service and teardown manuals for mcquay PEH Size: 063 PE Sizes: 063; 150 - 225 TEH Size: 063. 2009 McQuay International Installation and Maintenance Manual IM 968 Group: Controls Part Number: IM 968 Date: October 2009 Supercedes: New MicroTech III McQuay. www.mcquay.ru Updated: 2012-09-14 MicroTech II - Service Manual. McQuay Air Conditioning Home Page McQuay - Manufacturer of heating, ventilating, air conditioning, refrigeration and building management equipment and systems.http://erboka.org/userfiles/fairmont-motor-car-manuals.xml
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Report this Document Download now Save Save Mcquay CE126 Teardown For Later 0 ratings 0 found this document useful (0 votes) 367 views 15 pages Mcquay CE126 Teardown Uploaded by Brett Gottlieb Description: McQuay 126 compressor teardown manual Full description Save Save Mcquay CE126 Teardown For Later 0 0 found this document useful, Mark this document as useful 0 0 found this document not useful, Mark this document as not useful Embed Share Print Download now Jump to Page You are on page 1 of 15 Search inside document Cancel anytime. Share this document Share or Embed Document Sharing Options Share on Facebook, opens a new window Share on Twitter, opens a new window Share on LinkedIn, opens a new window Share with Email, opens mail client Copy Text Footer menu Back to top About About Scribd Press Our blog Join our team. Quick navigation Home Books Audiobooks Documents, active. This firm later acquired McQuay.She specialized in the supply and service of airAfter 4 years, the plant, which was located south of Rome in the city of Chekkin, began to produceEach of themIn addition, this increase in productionThanks to this, McQuay products cover all the main directionsAs a result, Daikin and O.Y.L joined the financial and scientific-design resources. At the end ofSign up for free now at. Please feel free to contact us if the problem persists. Aarzel niet om ons te contacteren indien het probleem zich blijft voordoen. N'hesitez pas a nous contacter en cas de probleme. Prosimy o kontakt jezeli problem nie zostanie rozwiazany. By clicking “Accept”, you consent to the use of ALL the cookies. Cookie settings ACCEPT Manage consent Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent.https://www.atencion.com/userfiles/fairline-safe-manual.xml You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. It is mandatory to procure user consent prior to running these cookies on your website. In many cases, refrigerant charge has been reduced by 40 percent. Chloride Synthesis Twin Manual there. Honda Xl600r Repair Manual. Mar 18, 2012 Complete service repair manual for 2001-2004 Nissan Pathfinder. I am getting ready to go into a peh063 mcquay centrifugal. Centrifugal Chiller; PE076,079,255,285,320,360, PEH076,079 Rev. Centrifugal Compressor Water Chillers THE DISTINCTION. On 60 Hz service is 2,000 tons. Powerglide Rebuilding Manuals. Emely efficient McQuay WDC Dual Centrifugal Chiller. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Viewcontent Php3Farticle3Dmcquay Chillers Service Manual26context3Dlibpubs. To get started finding Viewcontent Php3Farticle3Dmcquay Chillers Service Manual26context3Dlibpubs, you are right to find our website which has a comprehensive collection of manuals listed. Our library is the biggest of these that have literally hundreds of thousands of different products represented. I get my most wanted eBook Many thanks If there is a survey it only takes 5 minutes, try any survey which works for you. The merger resulted in a combination of financial andAs of the end of 2006, the combined company occupied the 2nd place in the world in terms ofAll content on the site is taken from free sources and is also freely distributed. If you are the author of this material, then please contact us in order to provide users with aThe site administration does not bear any responsibility for illegal actions. Equipment and the application of the equipment and system suggestions are offered by McQuay International as suggestions only, and McQuay International does not assume responsibility for the performance of any system as a result of these suggestions. The system engineer is responsible for system design and performance. They are usually the most economical means to cool large buildings. Most design engineers will sooner or later use centrifugal chillers to meet their design needs. Figure 1 shows the basic centrifugal refrigeration circuit. It consists of the following four main components; The heat is used to boil the refrigerant changing it from a liquid to a gas. Flooded evaporators have the chilled water in the tubes and the refrigerant in the shell. Large chillers can have over five miles of tubing in their heat exchangers. The centrifugal compressor is a non-positive displacement type. It raises the pressure and temperature of the refrigerant by converting kinetic energy into pressure. In this case, it removes heat from the refrigerant causing it to condense from a gas to a liquid. The heat raises the water temperature. The condenser water then carries the heat to the cooling tower where the heat is rejected to atmosphere. This can be as simple as an orifice plate or as complicated as a electronic modulating thermal expansion valve.It has the advantage of graphically showing the process, the cooling effect and the work required to make it happen. The evaporator process is from point 1 to point 2. As the refrigerant changes from a liquid to gas, the pressure (and temperature) stays constant. The heat is being absorbed as a phase change (latent energy).The work is the change in enthalpy from point 2 to point 3 times the flow of refrigerant. Compressors end up with the work of compression as heat in the refrigerant. Open drive motors reject their winding heat in to the mechanical room. Since chiller motors are typically over 95 efficient, a little less than 5 of the motor power rating ends up as heat in the mechanical room. The vertical aspect of the curve shows the rise in refrigerant pressure (and temperature) from 2 to 3. The first section (outside the refrigerant dome) is the desuperheating process. Once the refrigerant is saturated, condensation occurs and the refrigerant changes from a gas to a liquid. Like the evaporator, the line is horizontal indicating constant pressure (or temperature). Notice the liquid subcooling portion of the condenser to the left of the dome. It is easy to see on the P-H diagram, how subcooling improves the total cooling effect. It lengthens the refrigerant effect per pound of refrigerant (a larger ?H) so that more cooling is done without an increase in power input. This shows as vertical line from point 4 to point 1, indicating the pressure (and temperature) drop that occurs as the refrigerant passes through the TX valve. The Air-Conditioning and Refrigeration Institute (ARI) provides test standards and certification for a wide range of HVAC products including centrifugal chillers. Additionally, chillers typically have a certification that provides engineers and owners with a third party validation that the chiller will meet the performance the manufacturer indicates.Assuming the work of compression is 25 of the heat collected in the evaporator, then the heat rejected in the condenser will be 125 of the evaporator heat. Using the ARI design conditions, typical temperatures are shown. Looking at the condenser, the refrigerant temperature remains constant at 97 o F. The refrigerant is changing from a gas to a liquid and is releasing its latent heat of condensation. At the same time the tower water enters the condenser at 85 o F and is gaining sensible heat as its temperature rises to approximately 95 o F. In this case, the evaporator refrigerant temperature remains constant at 42 o F. The refrigerant is changing from a liquid to a gas while absorbing its latent heat of vaporization. The chilled water entering the evaporator at 54 o F is releasing sensible heat and its temperature is dropping to 44 o F. These can be found on temperature-pressure charts. For HFC-134a, the condenser pressure at 97 o F is 118.3 psig. The evaporator pressure at 42 o F is 36.6 psig. Adding tubes (increasing surface area A) will improve heat transfer. It also lowers the fluid pressure drop. The downside to adding tubes is it adds cost. Most chillers utilize copper for tubing. Using thicker wall tubing, while more robust, will hurt performance by lowering the U value. Changing to a material with poorer heat transfer properties in the condenser will also hurt performance. The heat transfer coefficient can be improved by going to internally rifled tubing. The rifling adds surface area and increases turbulence to improve overall heat transfer. Enhancing the outside surface of the tube provides nucleation sites to improve boiling. These are parameters that the chiller manufacturer controls in the design of the chiller. Changing the saturated suction temperature or the saturated condensing temperature will change ?1 and ?2. If the saturated suction temperature is lowered from 42 o F to 40 o F, the LMTD will increase. It would then be possible to remove tubes (reducing the tube area A) from the chiller and still maintain the original heat transfer. The evaporator will cost less. However, the new saturated pressure is lowered to 35 psig. The compressor lift is increased from 81.7 psig to 83.3 psig. The compressor will have to work harder to do the job. Changing the return evaporator water temperature from 54 o F to 58 o F (switching from a 10 o F ?T to a 14 o F ?T) increases ?T F and improves the LMTD. However, changing the leaving condenser water temperature from 95 o F to 100 o F (switching from a 10 o F ?T to a 15 o F ?T) increases ?T F and lowers the LMTD. The solution to offset the larger condenser penalty ?T is more tubes (increasing the surface area) or raising the saturated condensing pressure. The later makes the compressor work harder. As mentioned earlier, the saturated pressures for these temperatures are known. At typical ARI conditions, the required pressure increase or lift is 81.7 psig. The purpose of the compressor is to provide this lift. Centrifugals are aerodynamic or turbine type. They move gas by converting kinetic energy to pressure energy. Positive displacement compressors encase a quantity of refrigerant in a decreasing volume during the compression process. They provide excellent lift characteristics. The advantage of centrifugal compressors is their high flow rates capability and good efficiency characteristics. One person swings the ball on the string. A second person is standing the second floor balcony. If the person swinging the ball releases ball with enough angular momentum, the ball will fly up to the person on the second floor balcony. The weight of the ball (molecular weight), the length of the string (wheel diameter) and the rotational speed (rpm) affect the angular momentum. Table 1 lists properties for the common refrigerants used with centrifugal compressors. Recall that the chilled and condenser water temperatures and the approach temperatures set the required lift. This is the same for any chiller. Reviewing Table 1, the required tip speed is very close (within 4) for any of the popular centrifugal refrigerants. The required tip speed is around 650 fps. Whether there is a small wheel spinning fast or large wheel spinning slowly, the tip speed is relatively constant regardless of refrigerant. Table 1 shows how many cfm of refrigerant are required per ton of cooling for the popular refrigerants. HFC-134a has a higher density. It is necessary to stay below Mach 1. Typically, the inlet velocity is limited to about 0.9 Mach. Using a 1000 ton chiller as an example, compare chillers using popular centrifugal refrigerants. Compressors based on HCFC-123 typically use direct-coupled motors so that at 60Hz, the compressor speed is fixed at 3550 rpm. The advantage of direct-drive is that no gearbox is required, however, fine tuning of tip speed is not possible without use of a variable frequency drive (VFD). Note that to achieve the correct tip speed, the wheel diameter needs to be 40.6 inches. Small compressor (5 inch diameter wheels) speeds can reach as much as 30,000 rpm. Again, the tip speed is constant around 650 fpm. It is important to note the stress on the wheel itself is proportional to the square of the tip speed not rpm. A large wheel spinning slowly will have the same stress as a small wheel spinning quickly if the tip speeds are the same. The wheel must be encased in a volute to collect the refrigerant as it leaves the wheel. A common solution to reduce the wheel diameter is to use two or three stage compressors. Figure 4 shows a cut away of a typical two-stage compressor. To improve compressor efficiency, refrigerant economizers are often used with two stage compressors. Figure 5 shows the P-H diagram for a two-stage compressor with economizer. All rights reserved. In this case the refrigerant goes through two expansion devices. When the refrigerant goes through the first device, some of the refrigerant flashes, or becomes a gas. The flashed refrigerant is introduced to the compressor between the two stages.Consequently, there is less mass flow through the evaporator. The passageway from the first to second stage represents a significant system effect and limits the efficiency improvement. Single stage compressors like the McQuay Distinction series utilize a subcooling circuit to lower the enthalpy of liquid refrigerant and increase the cooling effect. Like a fan curve, the area to the left represents unstable compressor operation. Returning to the example of the ball and string, if the ball is released toward the person on the second floor balcony but stops short of reaching the person, then a stall has occurred. In reality, the refrigerant is no longer moving through the compressor and there is no cooling effect. Worse, all the shaft work is being converted into heat in the compressor that may lead to permanent damage. In this case, the refrigerant flows backward through the compressor wheel every few seconds until the pressure builds up and the refrigerant moves forward again. This is even more dangerous than a stall because it reverses loads the thrust bearings in the compressor shaft. SurgeGard protects the compressor from stalls and surges. A chiller can surge if the operating conditions are changed so that the lift is increased, especially at low load conditions. Raising the tower water supply temperature or lowering the chilled water supply temperature beyond design points can lead to surge. Figure 7 shows the refrigerant gas exiting the impeller. At full capacity the gap between the impeller and the volute is sized correctly. As the chiller capacity is reduced, the refrigerant flow rate drops. The refrigerant still exits the impeller at the correct tip speed but the discharge area is too large for the reduced flow and the refrigerant stalls. As the refrigerant flow rate is reduced, the discharge area is also reduced to maintain the proper velocity. McQuay Dual Compressor Chillers can operate down to 5. Small, light, high speed impellers have smaller diameter shafts. The shaft tip speed is low and so is the bearing relative velocity. The oil is heated or cooled to maintain the proper temperature range. The bearing life is practically infinite. The shaft rotation creates a lubricant film that the shaft then rides on. Startup is the most critical time.Bearing material must be softer than the shaft material so if foreign material enters the bearing, it embeds in the bearing and not the shaft. Since aluminum is harder than babbit, the shafts must be harder than when babbit is used. Higher velocities improve heat transfer on the water side (inside) of the tube. Higher tube velocities reduce the LMTD and improve chiller efficiency, but unfortunately, also raise the fluid pressure drop. Rather than calculating the Reynolds number, common practice is to ensure fluid velocities are maintained above 3 fps. The maximum tube velocity is limited by tube erosion. To avoid damaging the tubes, 12 fps is typically used as an upper limit. While every situation is unique, here are some guidelines; HVAC applications necessitate the compressor to operate over wide range of lift and cooling capacities. As the inlet guide vanes start to close, they change the gas entry angle to the impeller and reduce gas flow and compressor capacity. As the vanes near the closed position, they throttle the refrigerant flow. If the prime mover is a turbine or internal combustion engine, the prime mover's speed can easily be changed. Induction motors require a Variable Frequency Drive (VFD) to change their speed. As the tip speed is lowered, the lift the compressor can produce is lowered. For compressor speed control to work, the required lift must be reduced either by raising the supply water temperature or lowering the condenser water temperature. The most common way to reduce the lift is to lower the condenser water temperature. As the ambient wet bulb temperature drops, it is possible to lower the condenser water temperature and realize significant savings. However, it is important to remember that unless the compressor lift is lowered, varying compressor speed cannot work. They can be unit or remote mounted. In most cases, the VFDs have to be water-cooled. Chilled watercooled units add load to the chilled water loop. Condenser water-cooled units do not affect the chilled water loop but are vulnerable to scaling from the open tower water and are not recommended. The chiller controller monitors the operating conditions and uses a combination of inlet guide vanes and speed control. Compressor speed is typically only lowered to about 60 of the design speed. Since VFDs introduce drive losses, the chiller will not be as efficient at full load (speed) with a VFD as with a standard starter. They can lower the inrush current for the motor to almost that of the full load running amps. This can be very important where chillers will operate on emergency power generator sets. However, the harmonics from a VFD can be of major concern. The chiller motor is typically the largest single electrical load in the building. Harmonics generated by the VFD can disrupt computer and communications equipment. Careful Harmonic analysis is required whenever a VFD chiller is applied. A careful economical analysis with realistic load profiles and ambient wet bulb is recommended when considering using VFDs. The refrigerant must pass through a pressure reducing device (Hot Gas Bypass Valve). The purpose of hot gas bypass is to maintain a minimum gas volume flow rate through the compressor to avoid surging or stalling during low load conditions. A disadvantage is that the work of compression on the recirculated refrigerant does not generate any refrigeration effect. Careful selection of equipment size and using compressor that unload to 10 percent of full load capacity can avoid the need for hot gas bypass in most HVAC applications. Many process applications still require hot gas bypass in order to completely eliminate compressor cycling and maintain constant chilled water temperature from zero load to full load. Open drive motors are easier to service or replace but being air-cooled means the motors operate at hotter temperatures. The higher operating temperature places additional stress on the motor compared to refrigerant-cooled motors. A major disadvantage to open-drive is that the compressor must have a shaft seal that will leak refrigerant and require a high maintenance effort. Internal combustion (I.C.) engines operating on natural gas, propane and diesel are also used. Steam turbines are sometimes used on large tonnage chillers. In such applications COPs around 2 (from a primary energy source) are possible. Careful economic analysis is required to ensure these more expensive prime movers are viable. Examples include lighting and resistance heating. Resistive work is measured in watts. Examples of inductive loads are transformers and lighting ballasts. The inductive reactive power is measured in kilo-volts-amperes-reactive or kVAR. The capacitive reactive power is measured in kVAR.It is always a combination of the three. Apparent power is the vector sum of real power and reactive power and is measured in kVA. If the reactive portion of the power triangle is not controlled, the operating cost will go up. The large inductive motors associated with centrifugal chillers increase the reactive power portion of the building’s power triangle. To minimize this, capacitors are often added. Below 50 without correction, the power factor drops very quickly. By raising the power factor to 95 at full load, the power factor will remain satisfactory over a wider operating range. The inrush current must be controlled to minimize the impact on the power grid. Several motor starter types are used for centrifugal chillers. These include Across-the-Line, Star-Delta, Autotransformer, Primary Reactor and Solid State. A detailed description of these starters is beyond the scope of this document. For more details see McQuay PM STARTER, Starters for Centrifugal Chillers -(latest edition). The valve provides the necessary pressure drop and also ensures the proper flow of refrigerant to the evaporator. As the superheat climbs indicating increasing load, more refrigerant is added. If the superheat drops, the refrigerant flow rate is lowered. This maximizes the efficiency of evaporator. The control parameter is the supply chilled water temperature. The controller measures the supply chilled water temperature and modulates the chiller capacity to maintain the setpoint.This information can be used for energy management, preventive maintenance and service diagnostics. Most manufacturers have some form of gateway to allow the chiller controlled to be connected to a Building Automation System (BAS).At ARI conditions, a chiller using HCFC-123 has an evaporator pressure of 17.6 inches of Mercury. It is very difficult to create a perfectly sealed unit, so some air (including moisture) will leak into the chiller. The air is referred to as a non-condensable. Non condensables create two problems. The first is the compressor does work moving the non-condensables but they offer no refrigeration effect. They can also blanket tubes with air eliminating them from doing any heat exchange work. Non condensables lower the real efficiency of the chiller from the cataloged or rated performance by as much as 8 at 60 load and 14 at 100 load. Moisture, in particular, is a problem. Moisture allows the formation of acids within the chiller that can cause serious damage to motor windings and bearings. The difficulty with purge units is they are another service item and also release refrigerant to the atmosphere when they remove non-condensables. Today, purge unit efficiency is very good, however older purge systems could lose as much as 25 of the chiller's refrigerant charge per year. Non-condensables cannot enter the chiller to damage it or reduce it’s efficiency. Their primary purpose is for servicing the chiller. They allow the charge to be stored while the refrigeration circuit is worked on. The condensers are specifically designed to hold the entire refrigerant charge and the necessary valves to isolate the charge in the condenser are included. Where there is tower water relief (decreasing tower water temperature), variable speed drives can be used to improve part load efficiency. By utilizing two compressors on a common refrigeration circuit, it is possible to greatly improve the part load efficiency of a centrifugal chiller. This is a major benefit of a dual compressor chiller. For example, a 1000 ton dual will have two nominal 500 ton compressors mounted. As the chiller unloads from 100 load, one compressor shuts off at approximately 600 tons (60 of full load). Only one compressor is required to circulate enough refrigerant to meet the load. That compressor is operating with its inlet guide vanes wide open and at maximum compressor efficiency. Additionally, the compressor is operating with a condenser and evaporator designed for twice the capacity. In effect, the two heat exchangers have twice the required surface area. This lowers the lift and improves the compressor performance. The need for operating only one compressor at mid-range chiller loads accounts for the superior performance of these chillers. Single compressor chillers are most efficient at or near 100 capacity. Dual compressor chillers are most efficient at 50 to 60 capacity. This matches the typical building load profile very well, offering optimum efficiency where there are the most run hours. Equipment covered by the ARI certification program include all water-cooled centrifugal and screw water chilling packages rated up to 2000 tons (7,000 kW) for 60 hertz service at ARI standard rating conditions, hermetic or open drive, with electric driven motor not exceeding 5000 volts, and cooling water (not glycol). For 50 hertz application the capacity range covered is 200 to 1,000 tons (700 to 3500 kW). The certified computer program version number and issue date for all manufacturers is listed in the ARI Directory of Certified Applied Air- Conditioning Products available on www.ari.org. The standard rating conditions are: Variable flow and chillers with VFDs are two such applications. While this manual does not go into detail on applications, it does give the engineer the basics to understand the impact such design considerations will have on a centrifugal chiller. Your local McQuay Sales Representative can also help with specific applications, selections and further training. Research Professor. College of Architecture. Illinois Institute of Technology. Chicago, Illinois, USAXavier’s College Bombay University; Post-Graduate Diploma in Environmental Engineering from London South Bank University; Post-Graduate Diploma (with Distinction) and Ph.D. in Industrial Management from Strathclyde University Glasgow. Registered Professional Engineer (P.E.) and Certified Energy Manager (CEM - Association.We've got online training courses and tutorials for eQUEST, Trane TRACE 700, OpenStudio, and LEED for energy modeling. All our energy modeling courses are video based. What better way to learn energy modeling software than screen-casts of exactly how things are done? Energy-Models.com is built in San Francisco, CA and Slinger, WI USA. These technologies contribute to our customer's everyday life. Discover this unique environment which made Daikin's air conditioning technology the world's top class. Automatically reset to restoration error. Automatically reset to restoration error. If any other fault conditions which are not listed occur, contact your nearest local dealer. DO NOT attempt to troubleshoot the unit by yourself. The auto restart function is not functioning.The air filter is dirty. The doors and windows are opened. The air suction and discharge of both indoor and outdoor units are clogged or blocked.