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CONDITIONING

1. AIR CONDITIONING SUPPLEMENT 2011 2 DIAGNOSTIC Case Study 2006 Chevrolet Cobalt A C al Mark Lemay This vehicle came in for a customer complaint of insufficient cooling from the A C System The air from the vent was cool but not cold quick visual check revealed no problems and since this vehicle has a pressure sensor in the high side line a scan tool was hooked up and the pressure was taken before the vehicle was started up Fig 2 The ambient air temper ature was 73 F and the system pressure measured at 74 psi Test procedure This test verifies that the sys tem has a minimum refrigerant charge The system met the speci fication in the service manual Next the vehicle was started the centre duct temperature and the high and low side pressures were taken using a manifold gauge set The readings were then com pared to the performance chart Fig 3 from the service manual All readings were taken with the doors closed the A C set to high blower and recirculation mode selected The driver s door win dow was opened 6 inches as per the test procedure Our vehicle measured a duct temperature of 57 F a low side pressure of 27 psi and a high side pressure of 196 psi When these reading were compared to the charts the readings were just within the system limits on pressure but the duct temper ature was a little high Next step With no clear direction a tem perature test was cal
2. about or attended Paul De Guiseppi s training seminars In this article Paul explains where we are now and where the A C industry is heading De Guiseppi has been work ing in the automotive industry Since 1985 and has been employed by MACS since 1997 He travels to Uncle Sam s major cities throughout the year to present A C clinics and training sessions on behalf of MACS Mobile Air Conditioning Society We ve asked him a few pertinent questions to find out more about the pulse of this industry What would you say was the main highlight at the last MACS convention Definitely the quality of the training sessions presented and the huge at tendance which clearly showed the interest and motivation that drives A C industry stakeholders count ed more than 25 sessions dealing with different topics for passenger vehicles as well as heavy duty equip ment all presented by renowned industry specialists What do you think made these seminars such a blockbuster This year and for the first time by the way we partnered with AVI Automotive Video Incorporated who helped bring together leading experts to talk about such a wide variety of topics We had case studies demon Strations clinics on system diagno Sis electronics new refrigerants and equipment and a bunch of outstand ing speakers from Denso CNH ACC Climate Control Caterpillar etc What is your feeling about the future of A C systems and t
3. bug screens bras The system was tested again for proper temperatures and outlet duct temperature All temperatures O Check for Low Refnigerant Charge fell within the normal range and LI Test Refrigerant for Contamination Non Condensable Gasses Air our duct temperature dropped from rca omi o o N Restnctio 57 F to 45 F O Check Fan Clutch e L Check Electric Cooling Fan LI Check Condenser Fan Si KNEE NI L Check Fan Shroud AIC High Side Press O Inspect Condenser and Radiator ASC High Side Presa 74 77 pal Gaskets ASC Disengage Reason None Dinspect Air Dams ECT Sensor r5 degF Inspect Coolant Condition Level IAT Sensor Mark Lemay is the owner of Ma Problems Repair and Retest Auto Aide Technical Services SES which is a company specializing UI Internal Contamination Ford s Black Death in technical training technical L Refrigerant Cvercharge assistance and mobile diagnostic LI Incorrect Condenser Installed l Condenser Installed Upside Down services For more information visit www autoaide ca ENT IL LS ER a bia EL i EEI UR Me oe LELI EL i Sa il ma k _ autosphere ca AIR CONDITIONING SUPPLEMENT 2011 3 4 INTERVIEW Trends Interview with MACS Expert in A C Systems Everyone who has visited MACS worldwide annual convention which takes place at the end of January in the US has either heard
4. ING SUPPLEMENT 2011 autosphere ca Price Hike The use of HFO 1234yf could also be accelerated by the increase in price of R134a Already hit with a 25 price increase as of last year Dupont and Honeywell announced recently that they would be forced to further increase the price of R134a 15 at Honeywell be cause of the extra cost of the raw materials trichloroethylene and perchlorethylene used to make it HFO 1234yf will be used in new European car models starting this year The NRDC Natural Resources Defense Council the IGSD Institute for Governance and Sustainable Development and the EIA Environmental Investigation Agency all assert that the elim ination of R154a would mean a reduction equivalent to 100 bil lion tons of R134a alone has a Global Warming Potential GWP 1 300 times higher than that of CO Improved Leak Detector features a long life solid electrolyte sensor technology that is designed to detect the more current and difficult frigerants Equipped with 1 3 HP reciprocating compressor it hasa built in condenser for high ambient temperature operation a built in evaporator to protect the compres sor against flood back a 16 cu in filter drier 0 7 micron oil work out of whether or not to repair sequence is programmable and the 2700 can handle most common refrigerants on the market www cpsproducts com HFC refrigerants s
5. Supported by the manufacturer s sales force e Meets or exceeds OE specs e Over 8 100 part numbers for import and domestic applications COMPETITIVE POSITIONING WITHIN THE MARKET e Competitively priced e Industry leading warranties COOLING DEPOT COMMITMENT TO TRAINING e Professional Leader Led Seminars TechPro TechPro Online programs for ASPs Cold feet or feeling the heat We know a thing or two about temperature control my i START BUILDING YOUR TEMPERATURE CONTROL BUSINESS AND ENJOY A NEW DEGREE OF SUCCESS WITH THE COOLING DEPOT DEPOT PROGRAM SUPPORTED BY eTRAINING 9 5 Auto Parts Plus 5 Auto Plus Reali da A A www uni selectcanada com Click on Location Finder 6 TECHNICAL NEWS Automobile Retrigerants The Situation Today gt by Francois Charron francois charron autosphere ca The death knell is about to ring for the hydro fluorocarbon HFC R134a which has a high potential for contributing to global warming and which has already been banned for all new vehicles sold in Europe this year And the US Environmental Protection Agency EPA is about to follow suit 2006 HFC regulations were adopted in Europe to forbid the use of gases with a Global Warming Potential GWP greater than 150 i e 150kg of CO which set in mo tion a progressive ban on R154a This fluid is no longer authorized for new vehicles manu
6. ates the entire engine compartment with no shadows or hot spots Its mod ular design is very ergonomic and all parts are user replaceable The is achieved within 4 hours and the charging station can work on either 110 240v input www cliplight com Our vacuum packed can was introduced in 2000 and quickly became the leading A C sealant in North America Since then we ve been 1 in i professional leak sealants with even more products that offer an alternative to expensive and labor intensive parts replacement Refrigerant Identifier With its innovative and ergo nomic design the Neutronics Ultima ID refrigerant identifier rapidly analyse and iden tify EPA SNAP approved blends on a large graphing display as well as the percentages present in automotive A C svstems Versatile and easy to use this high tech tool is equipped with a built in rechargeable power recharge of the lithium ion battery a built in printer for easy cus tomer billing www neutronicsinc com pack and car battery clips and Easily injected into any mobile A C system the sealant quickly seals leaks and continues to checks for leaks for years to come Safe for your customers cars and your recycling equipment Harmlessly circulates with oil and refrigerant in the A C system CLIPLIGHT sealants are trusted and used by automotive techs worldwide www cliplight com sales cliplight com 800 526 7096 auto
7. eaking O Ring Seals U Correct Applicaton Too Large Outlet Tube Warmer Than Inlet U Check for Undercharge Excessive in System Inspect Orifice Tube for Restriction Dirty Screen Cerrect Application Too Small Repair and Retest Fig 1 172 234kPa 999 1371 kPa MI Below 3596 25 34 psi 145 199 psi 10 C 50 F 29 29 C 6 85 F Fig 2 AIR CONDITIONING SUPPLEMENT 2011 autosphere ca 25 i i I 179 241 kPa 1067 1433 kPa EM 33 30 26 35 psi 155 208 psi C GUT l 186 248 kPa 1123 1543 kPa above 50 27 36 psi 163 224 psi 12 C 52 F DIAGNOSTIC When the dye injector was removed l Temperature Diagnostic Flow Chart A a bubble formed in the service port Measure condenser inlet line temperature within 4 of condenser Measure that the dye had been injected into condenser outlet line temperature within 4 of condenser Condenser side of orifice tube if sa equipped Temperature drop should be between 20 F and The leak detector was placed under 50 F the fitting and sure enough the detector started to tick The sys Between 20 F and 5C F tem was drained a new Schrader valve was installed the system was More than 50 Check Condenser Air Flow recharged and tested for leaks and O Bent Fins j j an condenser or dicat received a pass this time around between radiator and condenser Temperature O External air flow restrictions en
8. echnologies Since automobile A C systems are getting smaller use less refrigerant and have much tighter leaking tol erances they will keep getting more complicated and more difficult to Skilled technicians must stay updated by all means possible diagnose Furthermore they ll need to comply with regulations that will become increasingly more strin gent More hi tech equipment is now required to do the job right in the diagnosis and decision process And that means skilled technicians will need to stay updated by all possible means Attending training Seminars webinars trade shows and conventions like MACS read ing specialized magazines as well as online browsing are all great ways for the professional technician to make sure he does his work right according to regulations and the car manufacturer s specifications and requirements What do you know about the commercialization of the HF0 1234yf refrigerant In the US GM has announced that they will equip their entire 2013 vehicle production with this new refrigerant For the aftermarket segment there will be no retrofit allowed or even available The re frigerant is not yet available on the market on a large scale and its ID acronyms are either HFO 1234vf or R 1254yf AIR CONDITIONING SUPPLEMENT 2011 autosphere ca Francois Charron francois charron autosphere ca How are the repair and equipment testing companies doing No equi
9. factured this year and will be eliminated in all vehicle models as from 201 7 Environmental pressure After worldwide pressure to elim inate HFCs including RI34a a petition organized by three US based NGOs Non Governmental Organizations was presented to the EPA The EPA consequently decided to forbid its use although a timetable for elimination of this refrigerant in US manufactured vehicles has not yet been fixed Since the new HFO 1234yf refriger ant with a GWP of 4 compared with a GWP of 150 for R134a was approved by the EPA on February 24 of this year for all regular and SUV vehicles production the days of R154a have been numbered Furthermore among other advan tages of HFO 1254yf it s good to know that it requires very few modifications to work well in cur rent air conditioning systems Rejected solutions Among other alternative solutions Studied and approved by the EPA there was the HFC 152a refrigerant which uses hydrogen a very flam mable gas with a GWP of 140 and CO2 based R 44 with a GWP of 1 which raised major technical prob lems requiring modification of the air conditioning system and added a 30 cost increase for manufac turers Furthermore HFO 1234vf will be used in new European car models starting this year Standards and tolerances regarding the components manufactured for the latest air conditioning systems match with more ecological refrigerants AIR CONDITION
10. led for Temperature testing involves taking readings at the evapor ator and condenser inlet and outlet lines and comparing them to a chart Fig 1 and Fig 4 This test is conducted with all the doors open the vehicle ex posed to sunload if possible the engine slightly above idle around 1000 rpm and the A C turned to the MAX position When tested in this manner our vehicle readings were as follows condenser inlet temperature 135 F condenser outlet temperature 72 F evaporator inlet temperature 37 F the evaporator inlet temper ature measured 31 F When com pared to the charts this indicates that the system is undercharged Leak test An electronic leak detector was used and the hoses connections and heat exchangers were carefully checked with no signs of leaks evi dent The gauges were removed and a dye was injected into the system Temperature Diagnostic Flow Chart C Measure evaporator inlet line temperature on the outlet side of the onice tube close to the evaporator case Measure the evaporator outlet line temperature before the accumulator as close to the evaporator case as possible The ideal temperature difference is O F_ The acceptable range is 5 F Within this range there is enough refrigerant flowing in the system to transfer heat properly and to carry the refriferant oil out of the evaporator Outlet Tube 5 F Calder Than Inlet U Check for Overcharge Inspect Orifice Tube for L1 L
11. pment of any kind is avail able so far to handle this refriger ant but they re working on it Since it s a Slightly flammable gas safety features will have to be built into this new equipment There is also no existing equipment or device on the market to identify it as yet What is the trend in Europe They are still using the R 154a but plan to switch to HFO 1234yf too There will probably be some 2012 models sold later this year there that will use it with more to follow early next year and beyond NOTE Spectra Premium has in vited Paul De Guiseppi to present a training seminar on A C systems at their facility in Boucherville on Wednesday May 18 2011 Paul De Guiseppi is Manager MACS Training Services and an ASE Certified Master L1 in Automotive Mechanics cooling DESIGNED TO BUILD YOUR TEMPERATURE CONTROL BUSINESS 4 THE COOLING DEPOT e A comprehensive business solution for the Automotive Service Providers e A complete offering of Heating Ventilation and Air Conditioning products gt Condensers radiators radiator fan assemblies gt Compressors accumulators evaporators filter driers hoses gt Blower motors heater cores accessories gt Water pumps thermostats caps belts amp hoses gt Anti freeze refrigerants ester and pag oil SET YOUR SIGHTS ON THE BENEFITS OF THE COOLING DEPOT BUSINESS SOLUTION COOLING DEPOT BRANDED AIR CONDITIONING COMPONENTS e Trusted brand e
12. sphere ca AIR CONDITIONING SUPPLEMENT 2011 7 n TETELE LES climate control products 11 T mu 1 COMPRESSORS CONDENSERS ACCUMULATORS EDRPORRTORS g ALL MODELS ARE VALIDATED FOR FIT FORM AND FUNCTION m MANUFACTURED UNDER ISO 9001 TS 16949 CERTIFIED QUALITY SYSTEMS n EXTENSIVE LINE COVERAGE nt rDiBDTHIFORELGN AND ss DOMESTIC VEHICLES pk deo ee be ap ISBA Try our training online _ www spectrapremium com training 1 910 WWW SPECTRAPREMIUM COM SPECTRA PREMIUM
13. uch as R 134a R 410a R 404a R 407c and R507 in addition to all HCFC R22 and CFC R12 refrigerants including SNAP approved hvdrocarbon blends The unique digital leak size indicator of the 580951 model takes the guess a small leak The digital display is in dependent from the audio alarm and sensitivity level allowing the precise pinpointing of the leak source www cliplight com Recovery Recycling Recharging Station This refrigerant gas leak detector The AR2700 is the latest CPS tech nology in semi automatic recover the new dual automatic re i ing evacuating and recharging re separator The automatic charging cycle guard traps debris sealant and other contamin 4 air conditioning system No technical input is required ally from recover to recharge The unit also connects to both high and low sides Simultaneously and can be installed on all major A C ser vice equipment brands www airsept com NEW PRODUCTS Dual Recycle Guard Manufactured by Airsept company whose products are used or recom mended by 16 automakers ants that could enter a car s and it switches automatic and A TO LED Work Light Brighter than a 5 watt bulb the new Hemiplus rechargeable cord less LED work light manufactured by Cliplight offers more than 8 hours of continuous run time The handy tool projects a broad and solid light pattern that illumin

CONDITIONING

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