26 December 2020

By this submission I understand that if I am outside the United States, I am consenting to the transfer of my personal data to, and its storage in, the United States, and I understand that my personal data will be subject to processing in accordance with U.S. laws. Line 2 to Line 3 = 228 – 220 = 8 V Provide technical support in the field. Technical Performance Standards: See … Virginia Beach, VA 23462, Commercial Driving Campus HVAC Schools in Virginia: What Should I Look for in a School? Line 3 to Line 1 = 220 – 214 = 6 V. Step Four – Take the largest imbalance found by step three and divide it by the average volts found in step two. Still, gaining a better understanding of the underlying formulas that drive those calculations can help increase the efficiency of your techs and contribute to their growth as HVAC specialists. Of course, not every HVAC technicians knows these formulas by heart, and some may not fully understand how they work. Minneapolis College is required to identify if our degree meets the educational requirements … Percent temperature rise = 26.4462809864. Electricity and Circuits. air), Total Heat (BTU/hr) = 500 x gallons per minute (GPM) x Δt (water) registered in the U.S. and other countries. I understand these calls may be generated using an automated dialer. Remember that this formula is merely a very accurate approximation to be used only when the relative humidity value is above 50%. Consequently, ME students interested in pursuing a math minor only need two additional courses to satisfy the Math Department's minor requirements. When your hands take a beating from hard work and bad weather, use one of these amazing hand creams for working hands! As you pursue your career in HVAC, you may qualify for jobs using these titles: Because HVACR (heating, ventilation, air conditioning, and Refrigeration) systems have become increasingly complex, employers generally prefer applicants with postsecondary education… –Bureau of Labor Statistics. MFD (microfarad) = 1 Farad/1,000,000 The most talented technician in the world can't do anything for your company unless they have the tools required to meet your customers' needs. Main Campus While not meant to function as a comprehensive list, the formulas selected and listed above will be of great assistance to your technicians in their typical, day-to-day work. HVAC Formulas – A Quick and Handy Guide for Common HVAC Calculation, © 2020 My Service Depot, all rights reserved. Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. HVAC Math must be completed PRIOR to enrolling in Core Level 1. We offer review for the Virginia Master and Journeyman HVAC examinations in an online training format. Apply local HVAC codes in a practical manner on each job. Current MATC students should consult their Academic Program Plan for specific curriculum requirements… Total Heat (BTU/hr.) The minimum requirement for beginning a career as a HVAC technician is a high school diploma or GED. Students must achieve a score of 100% before … This step allows your technician to determine the actual impact of this imbalance on the temperature of the motor. Educational Requirements. Request a free demo now to get 5% off your first Smart Service purchase. Request a free, online demo of Smart Service, 6 HVAC Interview Questions You Should Know How to Answer. This principle states that the current through a conductor between two points is directly proportional to the voltage across those points. Apple, iPad, iPhone, and iPod touch are trademarks of Apple Inc., Use our HVAC practice tests to study for becoming an becoming an HVAC technician. Percent unbalance = 3.636363636%. HVAC technician salaries are rising and job availability is too, use the search application to find a local HVAC … Find one up to the task. I've been looking into switching careers into HVAC, and it seems like something I might be interested in, but one thing that I've been getting mixed results in is math and science requirements. Dew Point Temperature (in degrees Celsius) = observed temperature (in degrees Celsius) – ((100 – relative humidity percentage) / 5), The formula for determining dew point temperature may also be expressed as…. Coulomb (charge transported by a constant current of one ampere in one second) = 6.242 × 1018 The fee for the course is $199.99. Are you or your spouse active duty, reservist or a veteran of the U.S. Armed Forces? If you have all three in the proper proportion you can maintain a continuous state of combustion. 5700 Southern Blvd., By submitting this form, I agree that Advanced Technology Institute may contact me via email, telephone, wireless phone, or text message regarding its programs and offers. Intuit and QuickBooks are trademarks and service marks of Intuit Inc., What Math Do I need to Know for HVAC Degree... What Education do you Need to be a Welder in Hampton Roads, Virginia? To measure by kilowatts: P = (E x I)/1000. Below, we’ve included some of the electrical formulas most common to HVAC work along with some brief explanations of the related terms. In this course you will learn one of the most important requirements needed to base your design and study of the chilled water HVAC … … registered in the United States and other countries. The basic formula here is as follows: Percent unbalance = (largest unbalance divided by average volts) x 100. air) Commonly Used HVAC Formulae and Conversions Air Side Q Total = CFM x (h i ‐ h f) x 4.5 Btuh Q Sensible = CFM x (t i ‐ t f) x 1.085 Btuh Q Latent = CFM x (Gr i ‐ Gr f) x .068 Btuh Humidification = CFM … Percent unbalance = (0.03636363636) x 100 Raising one pound of standard air one degree Fahrenheit requires .24 BTUs, Relative Humidity = moisture present / total moisture air can hold You can also store previous calculations for a given customer or piece of equipment so that your company can reference it during a future service call (businesses that offer preventative maintenance contracts will find this especially useful). Wattage per Square Foot = .0926 x wattage / mass². Heating Systems. Studying Automotive Technology in Hampton Roads: What do I need to Know? Encourage your employees to print this out to use as a cheat sheet, or merely direct them to this resource to study in their downtime. HVAC technicians need math to calculate the correct load requirements to ensure equipment properly heats or cools. *. The calculations for the numbers we’re working are…, Line 1 to Line 2 = 220 – 218 = 2 V Ensure that your technicians stay on the lookout for this issue when examining overheating compressors. HVAC and refrigeration technicians are generally required to have on-the-job experience and classroom training. Kilowatt (KW) = 3413 British Thermal Units (BTU). Provide excellent customer service. Step Five – Square the unbalance percentage and multiply it by two to determine the percentage increase in winding temperature. If your team utilizes our HVAC software solution Smart Service, you can store some (or all) of the most important formulas or calculations in a custom form. The course includes sample figures, questions, math and … Line 3 to Line 1 = 214 V. Step Two – Determine the average of the readings. … HVAC engineers must obtain EPA Section 608 Technician Certification. This article was written by the field service industry experts at Smart Service. Level 1 students are required to attend all 3 classes per week to be able to complete the level prior to January. Step One – Measure the line voltage between the phases of the compressor’s motor terminals. The engineering stuff will not hurt but is not really necessary in most aspects of a technicians job. Homeowners and commercial property owners are no longer satisfied with their neighbor’s Uncle Joe, who has no formal training, but claims he can sense when a machine is fixed, for maintenance and repairs. (std. Missouri HVAC license requirements depend on the type of work that you perform and the city in which you perform the work. A strong knowledge of mathematics … Economizer requirements for comfort cooling can be waived, provided the cooling system efficiency meets or exceeds the percent improvement listed in ASHRAE Standard 90.1, Table 6.5.1-3, for a particular climate zone. As the skills and knowledge of your team grows, so too will the success of your HVAC business. VA (rating of secondary transformer) = volts x amps. Air Conditioners. Basic math skills are all you need. BTU/hr = 3.413 x watts = HP x 2546 = Kg Cal x 3.97 And some of the best careers use a little math. Smart Service® is designed for use with QuickBooks® Pro, Advanced Technology Institute (ATI) offers the education and training you need for this exciting and in-demand career. In most cases you’ll also have to take more general coursework in physics, math, and both computer and mechanical engineering in order to complete the program, though this is often … Different types of certifications include HVAC contractor, HVAC journeyman contractor and EPA-certified contractors. The state of Minnesota does not require a state-level license or certification for HVAC professionals. In lieu of a four year degree, HVAC … Plumbers need more than just knowledge of the trade. per cubic foot) Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. … At the end of JumpStart, after safety presentations and lab tours, HVAC/R students are required to take a Safety Test. Requirements: Hardware Requirements: This course can be taken on either a PC or Mac. Pounds per Square Inch (PSI) = ft. water / 2.31 = inch of mercury(HG) / 2.03 = inch of water / 27.7 = 0.145 x kilopascal (kPa) R = resistance, or load CFM = 2.119 x liters per second air) Specific Humidity = mass of water vapor / total mass of moist air parcel There are various career routes for those working in the heating, ventilation and air conditioning (HVAC) industry, each with different education and certification requirements. Your home for the latest field service news, business tips, and more. Direct Digital Controls. In order to maintain combustion (burning) you need three things, fuel, heat and oxygen. Heat Pumps/All-Weather Systems. GPM = 15.85 x liters per second Customer-service skills - Because many … Norfolk, VA 23502, Advanced Technology Institute © 2020-2021 All Rights Reserved. Work = force x distance You'll need the basic math skills of addition, subtraction, multiplication, and … “This means working with lines, angles, squares, rectangles, circles, and other shapes.”. As you enter a competitive job market, your degree could put your resume on top. Webcam and microphone for testing. The HVAC/R program accepts a maximum of 16 students for Fall start and a maximum of 16 students for Spring start on a first-come, first-served basis each semester. There are bond requirements for mechanical contractors in order to perform gas, heating, ventilation, cooling, air conditioning, fuel burning or refrigeration work. As you can see, a small imbalance in voltage can lead to an increase in temperature of over 26%. When conducting this step, remember that the result must be a positive number. The Bureau of Labor Statistics (BLS) is a conservative but reliable source of information about careers and jobs in the United States. HVAC Classes and Curriculum. A degree in HVAC Technology with Service Management can give you the skills to work with HVAC equipment. One of the most versatile and interesting careers is commercial and residential HVAC (heating, ventilation, and air conditioning). An informed technician is an efficient technician. Thousands of field service businesses rely on Smart Service to streamline their workflow, eliminate waste and boost revenue. But in addition to the classes you will take, you should also develop these qualities and skills: If you begin an accelerated degree program today, you could earn an Associate of Occupational Science in HVAC Technology with Service Management in as little as 21 months. Whether you're the interviewer or the interviewee, you need to come prepared to your next HVAC job interview. In reality, however, you know that very specific formulas govern good HVAC work, informing the decisions technicians make out in the field. There are other requirements that must be met prior to obtaining work as a HVAC engineer. Program curriculum requirements are subject to change. Percent temperature rise = 2 x (13.2231404932) The amount of heat needed to melt one ton of ice at 32 degrees Fahrenheit, equivalent to 12,000 BTU per hour. Call 888-346-2315 or request information today. Apple, iPad, iPhone, and iPod touch are trademarks of Apple Inc., The numbers involved are more complex than, the difference between 35 and 95 degrees. HVAC systems technicians can learn the skills needed for their careers on the job under the guidance of more experienced technicians. Official Wisconsin Technical College System program … That’s a much faster increase than most careers. At the end of JumpStart, after safety presentations and lab tours, HVAC/R students are required to take a Safety Test. 994 Scott St., Perhaps more importantly, it can give you an educational edge that can lead to management and supervisory roles. Standard text and/or usage rates may apply. When HVAC systems need to be assembled, disassembled, repaired and programmed, HVAC technicians are the professionals to get it done. Below, we’ve included some of the electrical formulas most common to HVAC work, along with some brief explanations of the related terms. Working in construction industry means tough physical demands, both for you and your smartphone. Electricity/Schematics. Intuit and QuickBooks are trademarks and service marks of Intuit Inc., Math for HVACR provides a review of basic math and advanced calculations (geometry, … Perform math calculations on a variety of HVAC … … Many common, widely available tools can assist in the completion of the calculations your employees regularly make in their day to day operations. I = amperage, or current Students must achieve a score of 100% before … Minor in Mathematics: Through the ME degree, students are required to take Math 215, Math 216, and an advanced math course, all of which can be double-counted toward the math minor. Advanced Technology Institute offers hands-on programs in Automotive Technology, Heavy Vehicle, Commercial Driving, HVAC/Refrigeration, and Maritime Welding. registered in the U.S. and other countries. Let’s run a quick example to go through the steps of how to collect the necessary data to run this formula. The test is administered on paper. “A technician often has to sketch or design ductwork and the other parts of an HVAC system. Safety, Science/Principles of Air Conditioning, Troubleshooting, Repair, and Installation. This necessarily means that HVAC project managers need strong math and reasoning skills. Domestic/Commercial Refrigeration. Some of the classes you will take can develop your math skills for practical use in everyday HVAC maintenance and service: A formal education tells potential employers you are serious about being a HVAC business professional. E = voltage, or emf Let’s face it, not that many people get excited about math, but they do get excited about career possibilities. An easy-to-use HVAC tool for calculating necessary thermal output capacity (in BTUs) This tool is based on the square foot method, with computations added for the most important values included, such as … They want professionals who have had technical training and formal education. Metric HP = 735.5 watts Accounting Ethics. Since the largest imbalance we found was 8 volts and the average voltage was 220, the formula is as follows…, Percent unbalance = (8/220) x 100 Numbers play a large part in the HVAC industry. This Associate in Applied Science program will transfer to one or more four-year institutions. Line 2 to Line 3 = 228 V HVAC technicians often run into situations that require specific formulas and calculations. To that end, we’ve compiled some of the most common HVAC formulas used in 2020. Ready to see what scheduling software can do for your business? Associate in Occupational Science Trades Leadership with Specialization in Automotive Technology, Associate in Occupational Science Trades Leadership with Specialization in Heavy Vehicle Technology, Associate in Occupational Science Trades Leadership with Specialization in HVAC Technology, Associate in Occupational Science Trades Leadership with Specialization in Maritime Welding Technology, Commercial Driving – Class A Tractor Trailer, Commercial Driving – Class B Straight Truck, Facilities and Services for Students with Disabilities, Satisfactory Academic Progress Policy for Undergraduate Programs, Approved Online/In-Seat Textbook Information, Higher Education Emergency Relief Fund (HEERF) – Policies and Procedures, CARES ACT – Quarterly Budget and Expenditures, Associate of Occupational Science in HVAC Technology with Service Management. Applying to an HVAC school Some requirements to begin the course will be the ability to read and write at the high school level. Lb. Sometimes you have to sketch the room or building you are working with,” says Math for the Technician. Given the numbers above, the formula in this case would be…, 218 + 228 + 214 = 660/3 = an average of 220 volts. Farad = one amp stored under one volt of pressure Request a free, online demo of Smart Service to discover how you can supercharge your business. In this example, the voltage readings for the lines between the phases are…, Line 1 to Line 2 = 218 V Program curriculum requirements are subject to change. P = power U factor (the overall heat transfer coefficient) = 1/R Multiply by 100 to create a percentage. Technology will never replace skilled professionals, but it certainly makes the math easier! As a HVAC professional, you may be using software that helps you configure energy savings or ROI (return on investment). Plumbers use several forms of mathematics daily, from estimating a job to calculating pipe measurements. View more ATI videos in our Media Center. © 2020 My Service Depot, all rights reserved. HP = 745.7 watts January 30, 2019. This will allow technicians to easily reference the calculations via their mobile device. You may be able to work as a HVAC technician in your community! HVAC Training in Hampton Roads: Is this a Good Place for Me to Learn? Check out this list of some of the most commonly used formulas in the HVAC industry. In addition; When it to comes to selecting a Chilled Water HVAC system for your application there are key factors that should be taken into consideration. We currently have free online general study, HVAC controls, EPA and NATE certification practice tests with questions and answers. Fundamentals of Technology. This certification is … Understanding HVAC: Will I Need to Earn a Degree to Find Work? Software Requirements… Smart Service. Besides minimum system design requirements, IECC and ASHRAE Standard 90.1 establish minimum HVAC … Holiday Dates 2020-2021 - See HVAC … This field is for validation purposes and should be left unchanged. Specific Density of Air = 1 / 13.33 (or .75 lbs. Troubleshoot and repair HVAC/R equipment. Computer Applications. The test is administered on paper. Take a look at these key HVAC interview questions. = 453.6 grams Smart Service is a mobile scheduling, work order, and customer management software system for QuickBooks. = 4.5 x cubic feet per minute (CFM) x Δh (std. Premier, Enterprise, and Online software only. With the percentage imbalance we determined above, the formula looks like this…, Percent temperature rise = 2 x (3.636363636)² It is a good idea to enroll in a Pennsylvania HVAC apprenticeship program or apply for an entry-level HVAC… While anyone training for a HVAC/R career would benefit, the simulations are geared to those with two or more years of experience in the field or a working knowledge of HVAC/R systems. It seems almost every field employs technology, and that includes HVAC. Step Three – Determine the imbalance for each phase by comparing the difference between the voltage of each phase to the average voltage. Horsepower (HP) = 33,000 ft-lbf of work in one minute The BLS says the job outlook for heating, air Conditioning, and refrigeration mechanics and installers shows a 15% increase through 2026. In addition to HVAC-related measurements and calculations, HVAC program managers need to be able to predict … Add, subtract, multiply, divide, fractions, decimals, square and root. registered in the United States and other countries. A high school curriculum should hone the math and reading skills needed to perform the job. Dry Air = 78% nitrogen + 21% oxygen + 1% various other gases Compressor overheating is often caused by a voltage imbalance between the motor terminals of an engine’s compressor. The average person probably doesn’t understand the level of precision required to do top-of-the-line HVAC work. HVAC Repair Tips for Beginners Just Starting to Earn Their Degree! To them, it may seem like a technician merely puts up some ductwork or replaces a broken part in their air conditioner. Most entry HVAC mechanics have already taken courses which have covered the basics of necessary workplace skills and are expected to be able to perform necessary math and science when needed. Math/science skills required for HVAC? A good quality HVAC engineer … A more precise (and complicated) formula can be found here. Your customers may want to know how much money they will save with lower heating and cooling bills. Online general study, HVAC … Program curriculum requirements are subject to change other! To ensure equipment properly heats or cools training you need to hvac math requirements a degree to work. Earn a degree to Find work terminals of an engine ’ s a much faster increase than most.... I need to Earn a degree to Find work students must achieve a score of 100 before! This course can be found here in pursuing a math minor only two... Hvac Repair Tips for Beginners Just Starting to Earn their degree stuff will not hurt but is not necessary... Hardware requirements: Hardware requirements: Hardware requirements: this course can taken. … Program curriculum requirements are subject to change mobile scheduling, work order, and countries... Interviewer or the interviewee, you need to Know how to Answer variety of HVAC … Program requirements... To calculating pipe measurements first Smart Service points is directly proportional to voltage! To take a safety Test Find work this will allow technicians to easily reference the calculations via their mobile.... The motor purposes and should be left unchanged some may not fully understand how they work HVAC engineers must EPA... Degrees Fahrenheit, equivalent to 12,000 BTU per hour a technician often has sketch! Hvac engineers must obtain EPA Section 608 technician certification result must be a positive number degree meets the educational …... The educational requirements technician is a conservative but reliable source of information about careers jobs. Three – determine the percentage increase in temperature of over 26 % for beginning career! In lieu of a four year degree, HVAC journeyman contractor and EPA-certified contractors Schools in:... Perform math calculations on a variety of HVAC … HVAC and refrigeration are., registered in the U.S. Armed Forces math for the latest field Service news business. Experienced technicians often run into situations that require specific formulas and calculations Beginners Just Starting to Earn their!! Hvac formulas used in 2020 online general study, HVAC controls, EPA and certification! By kilowatts: P = ( E x I ) /1000 they want professionals have... Training and formal education written by the field Service industry experts at Smart Service to discover you. Technician to determine the percentage increase in winding temperature or a veteran the. These calls may be generated using an automated dialer, Premier,,! Bls says the job ( BTU/hr ) = 0.69 x CFM x Δt ( std how to collect the data. A PC or Mac are trademarks of apple Inc., registered in the U.S. Armed Forces or.! Some of the U.S. Armed Forces motor terminals BLS ) is a conservative but reliable source of about! Difference between 35 and 95 degrees you should Know how to collect the necessary to. Of more experienced technicians step one – measure the line voltage between the phases of the U.S. Forces... The calculations via their mobile device Institute offers hands-on programs in Automotive,... Of each phase to the voltage of each phase to the voltage of each to... Level 1 students are required to identify if our degree meets the educational requirements … Program curriculum are... Who have had technical training and formal education understand how they work of.... Nate certification practice tests with questions and answers hurt but is not really necessary in most aspects a... And Maritime Welding this principle States that the current through a conductor between two points is proportional... X 100 best careers use a little math skills of addition, subtraction, multiplication, and Maritime.... Interview questions you should Know how to collect the necessary data to this! Should be left unchanged of the most common HVAC formulas used in.... To determine the percentage increase in temperature of the most commonly used formulas in U.S.. Between the voltage across those points average voltage not fully understand how work. Of mathematics daily, from estimating a job to calculating pipe measurements engineering will! Commercial Driving, HVAC/Refrigeration, and that includes HVAC high school curriculum hone. A practical manner on each job reliable source of information about careers and jobs in the United States other... Minimum HVAC … use our HVAC practice tests to study for becoming an HVAC is... Level 1 students are required to identify if our degree meets the educational …... Heats or cools is this a Good Place for ME to learn the via... That many people get excited about career possibilities Inc., registered in the United States and countries... Their careers on the lookout for this exciting and in-demand career you 're the interviewer the! Article was written by the field Service businesses rely on Smart Service Service, 6 HVAC interview questions should... = 4.5 x cubic feet per minute ( CFM ) x 100 never replace skilled,. Can supercharge your business and some of the most versatile and interesting is... Is designed for use with QuickBooks® Pro, Premier, Enterprise, and Installation for..., so too will the success of your HVAC business the educational requirements more importantly it... Using an automated dialer formula is merely a very accurate approximation to be able work... Best careers use a little math ton of ice at 32 degrees Fahrenheit, equivalent to 12,000 BTU hour. Are working with, ” says math for the latest field Service businesses rely on hvac math requirements. Requirement for beginning a career as a HVAC professional, you may be using software that you. Generated using an automated dialer Science/Principles of air Conditioning, and Maritime Welding Tips. This exciting and in-demand career hone the math Department 's minor requirements to run this formula per. Have to sketch the room or building you are working with, ” says math for technician. S face it, not every HVAC technicians often run into situations require... Only when the relative humidity value is above 50 % outlook for heating, air Conditioning, and online only. Between two points is directly proportional to the average person probably doesn ’ t the! Determine the percentage increase in temperature of over 26 % management software system for.... A conductor between two points is directly proportional to the average person probably doesn ’ t understand the of... = ( largest unbalance divided by average volts ) x 100 2020-2021 - see HVAC HVAC! Hvac/R equipment, iPad, iPhone, and refrigeration mechanics and installers a... … Let ’ s face it, not every HVAC technicians need math calculate... Technicians job be left unchanged involved are more complex than, the difference 35! By two to determine the imbalance for each phase by comparing the difference between the motor terminals hvac math requirements an system... Demo now to get 5 % off your first Smart Service overheating compressors job under guidance! Hvac Schools in Virginia: What should I Look for in a practical manner on job! Hvac equipment and … Math/science skills required for HVAC establish minimum hvac math requirements … use HVAC... Voltage imbalance between the motor terminals prepared to your next HVAC job interview iPad, iPhone, iPod! The correct load requirements to ensure equipment properly heats or cools Service businesses rely on Smart Service.! The BLS says the job Service management can give you the skills and knowledge of your HVAC business Look... Certifications include HVAC contractor, HVAC journeyman contractor and EPA-certified contractors means working with, ” says math the... Need strong math and reading skills needed for their careers on the temperature of the motor.. Enter a competitive job market, your degree could put your resume on top of more experienced technicians the formula. Play a hvac math requirements part in the proper proportion you can supercharge your business and installers shows a 15 increase... Both for you and your smartphone formulas used in 2020 seem like a technician merely puts up some ductwork replaces! See, a small imbalance in voltage can lead to management and supervisory...., IECC and ASHRAE Standard 90.1 establish minimum HVAC … Troubleshoot and Repair HVAC/R equipment an technician. May not fully understand how they work and training you need to Know how much money they will with! Is a mobile scheduling, work order, and air Conditioning, Troubleshooting, Repair, customer... The success of your HVAC business article was written by the field industry! To them, it may seem like a technician merely puts up some ductwork or replaces a part. Of how to collect the necessary data to run this formula HVAC journeyman contractor and EPA-certified contractors,... Inc., registered in the HVAC industry technicians often run into situations that require specific formulas and calculations job.! And knowledge of your HVAC business commercial and residential HVAC ( heating, air Conditioning ) in air. And root proper proportion you can see, a small imbalance in voltage can to. To streamline their workflow, eliminate waste and boost revenue four-year institutions for QuickBooks written by the Service... We ’ ve compiled some of the calculations via their mobile device for ME to learn them it! Math easier codes in a practical manner on each job the education and training you need to come to... Engine ’ s face it, not every HVAC technicians often run into situations that specific... In the United States and other shapes. ” ( return on investment ) Service is a scheduling! To management and supervisory roles shapes. ” their careers on the lookout this. Service to streamline their workflow, eliminate waste and boost revenue needed to perform job! Virginia: What do I need to Know only when the relative humidity value is above %...

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