Iha 2011 November Webinar Quiz - Modine
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Gas-fired mechanical HVAC equipment, involving the combination of piping volatile combustion gasses, electrical wiring, motors, controls, gas valves and potentially hazardous flue products, are best installed & serviced by _____.
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Anyone who has a toolbox with wrenches, screwdrivers and a hammer.
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Anyone who can change a faucet or a light fixture.
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Licensed or certified mechanical contractors, or similarly trained & experienced service technicians.
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Anyone who can change the oil on a car.
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This quiz was created to review the November 17, 2011 webinar presented by Modine
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- 2.
Because proper inlet & outlet gas pressure is so important to the combustion process & proper operation of gas-fired appliances, it is almost impossible to trouble-shoot a service problem on a gas-fired unit heater without using a ______.
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Flat head screwdriver
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1/4 inch nut driver
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3/8 inch wrench.
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Liquid filled U-tube manometer.
Correct Answer
A. Liquid filled U-tube manometer.Explanation
A liquid filled U-tube manometer is necessary for troubleshooting service problems on a gas-fired unit heater because it allows for accurate measurement of gas pressure. Proper inlet and outlet gas pressure is crucial for the combustion process and the correct operation of gas-fired appliances. A manometer is used to measure the pressure difference between two points, and in this case, it would be used to measure the gas pressure in the unit heater. This information is essential for diagnosing and resolving any issues with the unit.Rate this question:
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- 3.
The main purpose of safety devices on gas-fired unit heaters is _____.
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To help keep the units running
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To help keep the crops from freezing
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To help prevent the risk of catastrophic fires or explosions
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To help keep mechanical contractors employed
Correct Answer
A. To help prevent the risk of catastrophic fires or explosionsExplanation
The main purpose of safety devices on gas-fired unit heaters is to help prevent the risk of catastrophic fires or explosions. These safety devices are designed to detect any potential issues or malfunctions in the unit that could lead to dangerous situations. By detecting and addressing these issues, the safety devices ensure that the unit operates safely and reduces the risk of fires or explosions, protecting both the equipment and the surrounding environment.Rate this question:
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- 4.
Which of the following statements is true regarding proper gas pressures?
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There is no difference between inlet & manifold gas pressures, and both are the same for natural & propane gas.
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Inlet pressure is different from manifold pressure on natural gas, inlet pressure is different from manifold pressure on propane gas, and both gas pressures are different on both gasses.
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Natural & propane gas pressures are different, but for each type the inlet & manifold gas pressures are the same.
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Inlet and manifold gas pressures are different, but each is the same for both natural & propane gas.
Correct Answer
A. Inlet pressure is different from manifold pressure on natural gas, inlet pressure is different from manifold pressure on propane gas, and both gas pressures are different on both gasses.Explanation
The correct answer states that the inlet pressure is different from the manifold pressure for both natural gas and propane gas. Additionally, it states that both gas pressures are different for both types of gas. This means that the pressure at which the gas enters the system is not the same as the pressure at which it is distributed throughout the system, and the pressures for natural gas and propane gas are also different from each other.Rate this question:
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- 5.
Proper wiring of mechanical HVAC equipment requires_____.
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The right wires connected to the right terminals
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All wiring connections securely fastened
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The correct wiring gauges given the amp load and distance in feet from the supply voltage
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All of the above.
Correct Answer
A. All of the above.Explanation
Proper wiring of mechanical HVAC equipment requires all of the above. This means that in order for the equipment to function correctly, the right wires must be connected to the right terminals, all wiring connections must be securely fastened, and the correct wiring gauges must be used based on the amp load and distance from the supply voltage.Rate this question:
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- 6.
Besides the proper inlet & manifold gas pressures, what other element is required for proper combustion?
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An adequate supply of combustion air inside the greenhouse, whether it is vented through the structure or through the use of 2-pipe separated combustion units
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Luck
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Safety devices
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Amp probes
Correct Answer
A. An adequate supply of combustion air inside the greenhouse, whether it is vented through the structure or through the use of 2-pipe separated combustion unitsExplanation
An adequate supply of combustion air is required for proper combustion because it provides the necessary oxygen for the combustion process. Without enough air, the fuel will not burn efficiently and may produce incomplete combustion products such as carbon monoxide. Venting the combustion air through the structure or using 2-pipe separated combustion units ensures that there is a continuous flow of fresh air into the greenhouse, promoting safe and efficient combustion. Safety devices and amp probes are important for monitoring and controlling the combustion process, but they do not directly contribute to the supply of combustion air.Rate this question:
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- 7.
Because gas combustion is a complicated chemical process requiring a precise mixture of fuel & oxygen, which of the following statements is true?
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Gas unit heaters are test-fired at the factory, so it is OK to install unit heaters out of the box as-is without any adjustments.
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Due to extensive & on-going vibration during shipping, handling and operation, it is important to adjust & re-secure the gas manifold and/or air shutters based on observing the flame pattern at start-up and periodically thereafter.
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All natural gas & propane gas supplies have the exact same heat content & specific gravity year-around across all of North America, so adjusting the manifolds and/or air shutters for a proper flame pattern isn’t necessary.
Correct Answer
A. Due to extensive & on-going vibration during shipping, handling and operation, it is important to adjust & re-secure the gas manifold and/or air shutters based on observing the flame pattern at start-up and periodically thereafter.Explanation
Gas combustion is a complex chemical process that requires a precise mixture of fuel and oxygen. Due to the vibrations that occur during shipping, handling, and operation, the gas manifold and/or air shutters may become misaligned, affecting the flame pattern. Therefore, it is necessary to observe the flame pattern at start-up and periodically thereafter to ensure proper adjustment and re-securing of the gas manifold and/or air shutters.Rate this question:
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- 8.
A good way to begin trouble-shooting a service problem and prevent crop losses, even if you aren’t a licensed or trained HVAC service technician is to _____.
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Start replacing parts until something good happens.
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Understand the proper sequence of operation, and report what isn’t happening right to a licensed or trained HVAC service technician within a short drive of the job site.
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Call the manufacturer’s headquarters, ask for the CEO & demand a free new unit or else!
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Call a trial lawyer.
Correct Answer
A. Understand the proper sequence of operation, and report what isn’t happening right to a licensed or trained HVAC service technician within a short drive of the job site.Explanation
A good way to begin troubleshooting a service problem and prevent crop losses, even if you aren't a licensed or trained HVAC service technician, is to understand the proper sequence of operation and report what isn't happening right to a licensed or trained HVAC service technician within a short drive of the job site. This approach suggests that it is important to have a basic understanding of how the system should operate and communicate any abnormalities to a professional who can properly diagnose and fix the issue.Rate this question:
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- 9.
When Modine does get directly involved in a customer’s service problem, we need to _____.
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Know the model number, power code, control code and serial number of the unit in question
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Know a good description of the installation, preferably digital pictures of the installation
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Know where the breakdown is in the sequence of operation, so we can begin talking-through the problem with a licensed or trained HVAC technician.
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All of the above
Correct Answer
A. All of the aboveExplanation
When Modine does get directly involved in a customer's service problem, it is important for us to have all the necessary information to effectively address the issue. This includes knowing the model number, power code, control code, and serial number of the unit in question. Additionally, having a good description of the installation, preferably with digital pictures, helps us understand the context of the problem. Lastly, knowing where the breakdown is in the sequence of operation allows us to provide guidance and troubleshooting steps to a licensed or trained HVAC technician.Rate this question:
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- 10.
A field service problem on a gas-fired unit heater is _____.
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An inevitable disaster waiting to happen
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An opportunity to demonstrate the value you add to the customer by playing a role in getting their problems solved as quickly & effectively as possible
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An opportunity to up-sell your customers from repairing an old, inefficient model with aluminized steel heat exchangers & burners, to new, more efficient models with the proper stainless steel heat exchanger & burner materials and a fresh 10-yeaqr warranty..
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A & B
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B & C
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A & C
Correct Answer
A. B & CExplanation
A field service problem on a gas-fired unit heater is an opportunity to demonstrate the value you add to the customer by playing a role in getting their problems solved as quickly and effectively as possible. It is also an opportunity to up-sell your customers from repairing an old, inefficient model with aluminized steel heat exchangers and burners to new, more efficient models with the proper stainless steel heat exchanger and burner materials and a fresh 10-year warranty.Rate this question:
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Current Version
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Jun 22, 2023Quiz Edited by
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Nov 11, 2011Quiz Created by
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