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Week 3 Homework

Week 3 Homework. Print off 5 of the practice sheets. You will be doing your homework on them. The first three slides show an example of a system that is running correctly. Before doing your homework, you might try answering the question on those slides.

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Week 3 Homework

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  1. Week 3 Homework Print off 5 of the practice sheets. You will be doing your homework on them. The first three slides show an example of a system that is running correctly. Before doing your homework, you might try answering the question on those slides. Slides 4 thru 9 have systems that are not working correctly. You have all the information you need to fill out your practice sheets but you may need to hunt for it. After the first one or two, you’ll know where to look. Fill out your practice sheets using the plastic cards to figure out the various temps, etc and at the bottom, tell me what is wrong with the system using the up and down arrows on your plastic cards. Staple them all together, Be sure to put your name on them and hand them into me on Tuesday. This homework is worth 25 points. Each system is worth a maximum of 6 points but you can get partial credit. Depends.

  2. This system is filled with R 410A and is operating properly. What is the superheat? What is the Sub-cooling? (Not part of the test, just askin’ See answer on following slide) S.A. = 55 degrees 316 R.A. = 75 degrees 55 118 O.S. Air= 90 degrees 275 80

  3. This system is filled with R 410A and is operating properly. What is the superheat? What is the Sub-cooling? S.A. = 55 degrees 275 Superheat: 118 PSIG = 40 degrees Line temp is 55 degrees. 55 -40 =15 degrees of Superheat. • Sub-cooling: • 275 PSIG = 90 degrees. • Line temp is 80 degrees. • 90 • 80 • = 10 degrees of • Sub-cooling R.A. = 75 degrees 55 118 O.S. Air= 90 degrees 275 80

  4. This system is filled with R 410A and is operating properly. What is the superheat? What is the Sub-cooling? What is the saturation temp and pressure in the evaporator? In the condenser? Problem #1 S.A. = 55 degrees 275 Superheat: 118 PSIG = 40 degrees Line temp is 55 degrees. 55 -40 =15 degrees of Superheat. • Sub-cooling: • 275 PSIG = 90 degrees. • Line temp is 80 degrees. • 90 • 80 • = 10 degrees of • Sub-cooling R.A. = 75 degrees 55 118 O.S. Air= 90 degrees 275 80

  5. Problem 2. This system is filled with R 410A and is NOT operating properly. It is a SEER 13 unit. Use your practice sheet and number it #2. Do your work on it. Return air Wet Bulb = 62 R.A. RH = 58% S.A. = 70 degrees 156 R.A. = 75 degrees 70 157 O.S. Air= 90 degrees 156 80

  6. Problem 3. This system is filled with R 410A and is NOT operating properly. It is a SEER 16 unit. Use your practice sheet and number it #3. Do your work on it. Return air Wet Bulb = 62 R.A. RH = 50% S.A. = 70 degrees 156 R.A. = 75 degrees 70 157 O.S. Air= 110 degrees 156 80

  7. Problem 4. This system is filled with R 22 and is NOT operating properly. It is a SEER 10 unit. Use your practice sheet and number it #4. Do your work on it. Return air Wet Bulb = 62 R.A. RH = 50% S.A. = 75 degrees 243 Fixed Meter R.A. = 75 degrees 60 67 O.S. Air= 95 degrees 243 95

  8. Problem 5. This system is filled with R 22 and is NOT operating properly. It is a SEER 13 unit. Use your practice sheet and number it #5. Do your work on it. Return air Wet Bulb = 62 R.A. RH = 50% S.A. = 75 degrees 243 Fixed Meter R.A. = 75 degrees 60 67 O.S. Air= 95 degrees 243 95

  9. Problem 6. This system is filled with R 410A and is NOT operating properly. It is a SEER 13 unit. Use your practice sheet and number it #6. Do your work on it. Return air Wet Bulb = 62 R.A. RH = 50% S.A. = 70 degrees 256 R.A. = 75 degrees 70 201 O.S. Air= 90 degrees 256 80

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