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Just one of the 7,200 branches in over 30 countries helping with your car rental needs. Founded in 1957, Enterprise Rent-A-Car is an… A number of RSES training courses, as well as eLearning and seminars have been recognized by NATE for continuing education hours. Individuals who successfully complete one or more of these courses or seminars will receive credit toward renewing their NATE certification.hvac calculations in ip units Refrigeration & Air Conditioning (R/AC)bmw e46 ac control unit • Principles of Refrigeration - 32 CEHssears hvac units prices • Compressors, Condensers and Cooling Towers - 36 CEHs • Evaporators and System Components - 38 CEHs • Tools, Controls and Troubleshooting - 42 CEHs • Air Conditioning Principles - 37 CEHs

• Heat Transfer and Distribution - 32 CEHs • Heating Fundamentals - 36 CEHs • Electric Heating - 36 CEHs • Gas Heating - 32 CEHs • Oil Heating - 36 CEHs • Hot Water Heating - 38 CEHs • Steam Heating - 38 CEHs • Introduction to Electricity - 25 CEHs • Electrical Components - 32 CEHs • Basic Electronics - 40 CEHs • Troubleshooting Components - 44 CEHs • Troubleshooting Residential Equipment - 48 CEHs • Electricity for the HVACR Technician - 42 CEHs • Fundamentals of Controls - 30 CEHs • Electromechanical Controls - 40 CEHs Heat Pump - 128 CEHs • Training Manual 1 - 72 CEHs • Training Manual 2 - 72 CEHs • Training Manual 3 - 72 CEHs • NATE Air Conditioning and Heat Pumps Online Training - 4 CEHs To view more information, visit RSES eLearning. To view the list of current seminars, refer to the RSES Events Calendar. Earn 16 CEHs for attending educational sessions during the conference.

Simply visit the RSES Online Store, pay a nominal fee, read a specified published article from RSES Journal, successfully answer all 10 quiz questions correctly and print a certificate of completion for one hour of continuing education. The RSES Webinar Series is another way to earn CEHs. Past webinars are available through the RSES Online Store and one CEH can be earned for each webinar. RSES and many of its Chapters are official testing and training organizations of NATE. We offer both specific training programs and NATE’s complete family of tests for service technicians and installers, and the specialties under the HVACR umbrella. Training and testing for NATE certification is conducted through the local RSES Chapters. View the RSES Events Calendar to find scheduled exams in your area or contact your  to obtain testing date and location information in your area.Next ACT Test Date: Oct 22, 2016 Late Registration: September 17-30, 2016 REGISTER, VIEW SCORES, AND MORE

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That's why checking superheat and subcooling is so important. Let's go back to the beginning. You go on a service call and find low suction pressure. However, this time you consider the three main causes of low suction pressure, and check superheat and subcooling to make the correct diagnosis. CAUSE #1: Insufficient heat getting to evaporator. This can be caused by low air flow (dirty filter, slipping belt, undersized or restricted ductwork, dust and dirt buildup on blower wheel) or a dirty or plugged evaporator coil. Checking superheat will indicate if the low suction is caused by insufficient heat getting to the evaporator. To check superheat, attach a thermometer designed to take pipe temperature to the suction line. Don't use an infrared thermometer for this task. Then take the suction pressure and convert it to temperature on a temperature/pressure chart. Subtract the two numbers to get superheat. For example, 68 psi suction pressure on a R-22 system converts to 40F. Let's say the suction line temperature is 50F.

Subtracting the two numbers gives us 10F of superheat. Superheat for most systems should be approximately 10F measured at the evaporator; 20F to 25F near the compressor. If the suction pressure is 45 psi, (which converts to 22F) and the suction temp is 32F, the system still has 10F of superheat. The fact that these readings are normal indicates the low suction pressure is not caused by low refrigerant, but insufficient heat getting to the evaporator. CAUSE #2: Defective, plugged, or undersized metering device. Let's say a system has 45 psi suction pressure (converts to 22F) and 68F suction line temperature, the superheat is 46F (68 minus 22). This indicates low refrigerant in the evaporator. However, before adding refrigerant, check the subcooling to be sure the problem isn't caused by a defective, plugged, or undersized metering device. While superheat indicates how much refrigerant is in the evaporator (high superheat indicates not enough, low superheat indicates too much), subcooling gives an indication of how much refrigerant is in the condenser.

Subcooling on systems that use a thermostatic expansion valve (TXV) should be approximately 10F to 18F. Higher subcooling indicates excess refrigerant backing up in the condenser. On TXV systems with high superheat, be sure to check the subcooling as refrigerant is added. If the superheat doesn't change, and the subcooling increases, the problem is with the metering device. In the case of a TXV, it's likely that the powerhead needs to be replaced. To check subcooling, attach a thermometer to the liquid line near the condenser. Take the head pressure and convert it to temperature on a temperature/pressure chart. Subtract the two numbers to get the subcooling. For example, 275 psi head pressure on an R-22 system converts to 124F. The liquid line temperature is 88F. Subtracting the two numbers gives 36F. High superheat and high subcooling indicates a problem with the metering device. Keep in mind that subcooling won't increase on systems with a liquid line receiver, as extra liquid will fill the receiver instead of backing up in the condenser.

Receivers are rare on air conditioning systems, but very common on small refrigeration systems such as walk-in coolers and freezers. If a system with a receiver has high superheat and the liquid line sight glass is full of liquid (no bubbles), check the metering device. If the sight glass has bubbles, the system could be low on refrigerant, or the liquid line filter/dryer could be plugged. Your clue here is that a noticeable temperature drop across a liquid line filter/dryer indicates it's plugged. There are indeed some cases where low suction pressure is going to be caused by low refrigerant. If the superheat is high and the subcooling is low, the refrigerant charge is probably low. Just keep in mind two things here: first, find and fix the leak. Second, monitor both superheat and subcooling as you add the refrigerant, to prevent overcharging. Skip Egner is a technician with CS Service Experts, Ft. Myers, FL. He has been in the HVAC industry for 30 years, and in 2006 won the North American Technician Excellence (NATE) Certified Technician Competition-at HVAC Comfortech.