Btuh - Study guides, Class notes & Summaries

Calculate the air volume based upon these conditions: 90,000 BTUH output Return air temperature: 70F Supply air temperature: 110F a. 1,158 CFM b. 1,500 CFM c. 1,800 CFM d. 2,083 CFM d (2,083 CFM) When measuring CFM using temperature rise method, the furnace blower motor speed should be in: a. Continuous fan speed b. Cool mode speed c. Heat mode speed b (Cool mode speed) If a single phase electric heat section is supplied with 225 volts and is drawing 45 AMPS, the BTUH outpu...

HVAC S.T.A.R QUESTIONS AND ANSWERS ALREADY PASSED The evaporator in a refrigeration system: Is the component where refrigerant boils and absorbs heat. The purpose of the compressor is to change ___________. Low-pressure, low-temperature vapor to a high-pressure, high temperature vapor A common refrigerant leak detection device is the: Halide torch. Copper-plating of compressor parts is: Caused by contaminants in the system. If not properly installed, a hot-gas muffler might tra...

Which of the following factors affects a customer's level of comfort? a. Air movement b. Humidity c. Temperature d. All of the above correct answers d (All of the above: air movement, humidity, temperature) A cooling load calculation estimates the sensible heat gain of a structure. The maximum sensible capacity of a cooling-only system should be within ____% of this calculated value. a. ±10% b. +10% c. +15% d. +30% correct answers c (+15%) The maximum sensible cooling capacit...

HVAC Test 1 Latest Update Graded A+ Absorption A refrigeration cycle where input energy is heat Adiabatic without gain or loss of heat Air Conditioning controlling air temperature humidity and quality Air Cooled Condenser a heat exchanger that transfers building heat to outdoor air Air Handler air moving equipment that can change air temperature humidity and quality BTU British thermal unit. 1 BTU will increase the temperature of 1 lb of water 1 degree F BTUH Rate of heat fl...

Gas tech II Exam Questions And Answers 1) What is the minimum diameter of a pressure gauge needed to perform a leak test on gas piping? - ANS 3" 2) Amp meter can read what? - ANS Conductor magnetic field. 3) What would be the primary voltage of a furnace? - ANS 120/1/60. 4) What is the function of an intermittent pilot? - ANS Stay on during the main burner operation. 5) What is the millivolts power output on a thermocouple closed circuit test? - ANS 10 to 15 ...

HVAC NATE Heat Pump /171 Questions with Correct Answers Assured A+. On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? -Ans 6-7PSI or 6F What is the primary purpose of using flux when soldering copper or brass parts? -Ans Prevent Oxidation The water that results from a defrost cycle of an air to air heat pump(runoff) must? -Ans Drain off and away from the outdoor coil. Why must the runoff be drained off and away from ...

Which of the following factors affects a customers level of comfort? All of the above A cooling load calculation estimates the sensible heat gain of the structure. The cooling-only system should be within _____% of this calculated value. +15% The maximum sensible cooling capacity of a heat pump should be within ______% of the calculated sensible heat gain of a structure with a large heating load. +25% The combined output of a heatpump and its auxiliary heat should not exceed the cal...

Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode B: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is the heat pump more efficient? A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode A: Heating mode Which of the following components is exclusive to the heat pump? A: Conde...

Which of the following factors affects a customer's level of comfort? a. Air movement b. Humidity c. Temperature d. All of the above - correct answer d (All of the above: air movement, humidity, temperature) A cooling load calculation estimates the sensible heat gain of a structure. The maximum sensible capacity of a cooling-only system should be within ____% of this calculated value. a. ±10% b. +10% c. +15% d. +30% - correct answer c (+15%) The maximum sensible cooling capac...

Calculate the air volume based upon these conditions: 90,000 BTUH output Return air temperature: 70F Supply air temperature: 110F a. 1,158 CFM b. 1,500 CFM c. 1,800 CFM d. 2,083 CFM - d (2,083 CFM) When measuring CFM using temperature rise method, the furnace blower motor speed should be in: a. Continuous fan speed b. Cool mode speed c. Heat mode speed - b (Cool mode speed) If a single phase electric heat section is supplied with 225 volts and is drawing 45 AMPS, the BTUH output of...