3e151 C Set Vol 4

After locating the trouble, the next step would be to correct the malfunction. This means identifying and fixing the issue that caused the trouble in the first place. Turning the unit on, switching to heat mode, or switching to ventilation mode may not address the underlying problem and may not effectively resolve the malfunction. Therefore, the most appropriate next step would be to correct the malfunction itself.

The size of the water vessel used for the 500,000 BTU/h field boiler is 20 gallons. This means that the boiler requires a water vessel with a capacity of 20 gallons to operate efficiently.

The advanced design refrigeration-300 (ADR) uses R-404a as its refrigerant.

Electric heaters can be used without the risk of open flames because they do not require any combustible fuel to operate. They rely on electricity to generate heat, making them a safe alternative or temporary heating option. Unlike other types of heaters, such as cart-type ducted or immersion heaters, electric heaters do not pose a fire hazard and can be used in various settings without the need for ventilation or constant monitoring.

When starting up the field boiler, a steady reading of at least two volts should be received on the multimeter. This suggests that there is a consistent flow of electricity, which is necessary for the proper functioning of the boiler. A fluctuating reading may indicate an unstable or unreliable power supply, which could lead to issues with the boiler's operation. However, a steady reading of at least four volts is not necessary and may indicate an excessive power supply, which could potentially cause damage to the boiler.

If you must inspect and clean the evaporator coil, the problem is most likely insufficient cooling. The evaporator coil is responsible for absorbing heat from the air inside the refrigerator, and if it is dirty or clogged, it can't effectively cool the air. This can result in the refrigerator not cooling properly and not maintaining the desired temperature.

If the unit has an insufficient charge of refrigerant, two things that will happen are the evaporator will starve and not enough oil will circulate in the system. When there is not enough refrigerant, the evaporator will not receive the necessary amount to cool the air effectively, leading to poor cooling performance. Additionally, the lack of refrigerant can cause a decrease in oil circulation, which is essential for lubricating the moving parts of the system. This can result in increased friction and potential damage to the components.

Twenty-four-hour monitoring may be considered for any mission essential facility because these facilities are critical for the success of a mission and any disruption or security breach can have serious consequences. Monitoring these facilities round the clock ensures that any issues or threats can be detected and addressed immediately, ensuring the safety and functionality of the facility. This level of monitoring is not limited to specific types of facilities such as officer's quarters or airman's quarters, but rather applies to any facility that is deemed essential for the mission.

Fuel, dripping from the fuel valve, drops and falls onto the vaporizer plate of an immersion heater. The vaporizer plate is responsible for converting the fuel into a vapor or gas form, which can then be ignited to produce heat. The fuel dripping onto the vaporizer plate ensures a steady supply of fuel for the heater to function efficiently.

The correct answer is Preway. The question asks about the type of tent heater that uses a siphon to start the fuel flowing from the fuel can to the control valve. Out of the given options, Preway is the only one that fits this description. The other options do not mention the use of a siphon. Therefore, the correct answer is Preway.

The main difference between FDECU Type 2 and Type 3 is that Type 3 does not have a crankcase heater.

A heavy soot deposit in the burner on a preway tent heater would most likely be caused by a restricted combustion air inlet. When the air inlet is restricted, it can lead to an inadequate supply of oxygen for combustion, resulting in incomplete burning of the fuel. This incomplete burning produces soot, which then accumulates in the burner.

Adding additional lengths of smokestack can create a high-draft condition during a preway tent heater operation. This is because the increased height of the smokestack allows for better airflow and increased draft, which can result in a stronger and more powerful heating effect. The other options mentioned, such as a loose fitting pipe, top of rain cap below ridge of a building, and large trees extending above the building, do not directly contribute to a high-draft condition.

If an operation is excessively noisy, the possible cause could be loose mounting hardware. Loose mounting hardware can cause vibrations and rattling, resulting in excessive noise during operation. This can occur when screws, bolts, or other fasteners become loose over time or due to improper installation. Tightening the mounting hardware can help reduce the noise and ensure proper operation of the equipment.

The unit is ready for operation after pre-operation checks are complete. This indicates that there are specific checks and procedures that need to be done before the unit can be used. These checks ensure that the unit is in proper working condition and meets all necessary requirements for safe operation.

The unit will go into defrost mode when either the evaporator temperature is below freezing or the defrost key is pressed on the controller. This means that if the temperature of the evaporator drops below freezing, or if someone manually activates the defrost mode by pressing the key on the controller, the unit will enter defrost mode.

The circuit on the advanced design refrigeration (ADR) that is direction specific is the 24 VDC circuit. This means that the flow of current in this circuit can only go in one direction, which is from the positive terminal to the negative terminal. In contrast, alternating current (AC) can flow in both directions, while direct current (DC) flows in only one direction. Therefore, the 24 VDC circuit is the only one that is direction specific.

Preventive maintenance checks and services (PMCS) are used to find and correct or report problems. This means that PMCS is a proactive approach to identify any issues or faults in a unit before they become major problems. By conducting regular PMCS, potential problems can be addressed early on, preventing further damage or breakdowns. Additionally, PMCS helps in maintaining the overall functionality and efficiency of the unit, ensuring smooth operations and reducing the chances of unexpected failures.

The repair of a central production plant can be delayed if both structural and electrical repairs are required. Structural repairs involve fixing any damage or issues with the physical structure of the plant, such as walls, floors, or support beams. Electrical repairs, on the other hand, involve fixing any problems with the electrical systems and equipment within the plant. Both types of repairs are crucial for the proper functioning and safety of the plant, and any delays in either area can hold up the overall repair process.

Relay K8 is responsible for energizing the second stage of the heater. This means that when relay K8 is activated, it allows power to flow to the second stage, providing heat. The other stages (first, third, and fourth) are not energized through relay K8, indicating that the correct answer is the second stage.

If a field boiler is not filled with water, it will fail to start. This is because water is essential for the boiler to generate steam and produce heat. Without water, the boiler will not be able to create the necessary pressure and temperature required for operation. As a result, the boiler will fail to start and perform its intended function.

The proper power supply for the mechanical refrigeration section is 208-volt, three-phase, 60-cycle. This means that the power supply should have a voltage of 208 volts, be three-phase (meaning it has three separate power lines), and have a frequency of 60 cycles per second. This combination of voltage, phase, and frequency is the correct power supply for the mechanical refrigeration section.

The voltage difference has an effect on resistance-type US equipment by causing it to have a shorter life. This is because the higher the voltage difference, the greater the stress on the equipment, leading to increased wear and tear, and ultimately reducing its lifespan.

The vertical partition is the component of the immersion heater combustion chamber that separates the combustion chamber and ensures that air fully circulates as it travels through the heater. This partition helps to create a clear separation between the combustion process and the air intake, allowing for efficient and controlled heating.

If the compressor stops on high pressure or high temperature, the most probable cause would be a dirty condenser coil. A dirty condenser coil can restrict airflow and prevent the proper heat transfer, causing the compressor to overheat and shut off. This can lead to high pressure or high temperature conditions. The other options listed, such as a loose or slipping evaporator fan motor belt, a defective crankcase heater, or low refrigerant charge, do not directly relate to high pressure or high temperature issues.

The correct answer is "Vaporizing pot." In a preway tent heater, the vaporizing pot is the burner that is used. This burner is responsible for vaporizing the fuel, allowing it to be burned and produce heat. The vaporizing pot is an essential component of the tent heater's heating system.

The correct answer is "In the applicable technical manual." This is because preventive maintenance checks and services (PMCS) are typically performed according to the guidelines and procedures provided in the technical manual specific to the equipment or unit being maintained. These manuals outline the necessary steps, schedules, and requirements for conducting PMCS effectively and ensuring the proper functioning and longevity of the equipment. Commercial manuals and Air Force pamphlets may provide additional information or guidelines, but the primary source for PMCS procedures would be the applicable technical manual.

When lighting a preway heater, the correct sequence of actions is to first press the reset lever of the fuel control valve down and then turn the control knob to the high fire position. This is because pressing the reset lever ensures that any residual fuel is cleared from the system, and turning the control knob to the high fire position allows for maximum fuel flow and ignition, resulting in a higher flame and increased heat output.

A fluctuating flame in a preway heater is caused by water in the oil. Water in the oil can disrupt the combustion process by creating steam pockets that interfere with the flow of fuel. This can result in an inconsistent flame, causing it to fluctuate. The presence of water in the oil can be due to condensation or a leak in the system. It is important to address this issue promptly to ensure proper functioning of the heater.

The correct answer is tent frame. The tent frame is the first thing assembled on the TEMPER tent. This is because the tent frame provides the structure and support for the tent, allowing it to stand upright and be functional. Once the tent frame is assembled, other components such as the fly, end sections, and window sections can be added to complete the tent. However, without the tent frame, the other components would not be able to be properly attached or supported.

The operating temperature of a field boiler is typically set at 160°F. This temperature allows for efficient heating and operation of the boiler without risking damage or inefficiency. Higher temperatures may cause overheating and potential damage to the boiler, while lower temperatures may not provide sufficient heat output. Therefore, 160°F is the optimal operating temperature for a field boiler.

During the checkout period, the high limit control is checked for operation. The component that has a jumper wire installed is the operating limit control. This jumper wire is used to bypass the control temporarily, allowing the system to continue operating even if the high limit is reached. This is done to test the control's response and ensure that it is functioning correctly.

The proper oil level for the compressor is 1/8 to ½ a sight glass with the compressor running. This means that when the compressor is in operation, the oil level should be between 1/8 and ½ of the sight glass. This is important because the oil helps lubricate the moving parts of the compressor and ensures proper functioning. Having the correct oil level while the compressor is running helps maintain optimal performance and prevents damage to the compressor.

The motor protector (TH) is designed to protect the compressor from overheating. It is a safety device that monitors the temperature of the compressor and automatically shuts it off if it exceeds a certain threshold. This helps prevent damage to the compressor and ensures its longevity. The low pressure switch and high pressure switch are not specifically designed to protect against overheating, and the circuit breaker is a general safety device that protects against electrical overloads. Therefore, the motor protector (TH) is the correct answer in this case.

The correct answer is Aluminum-skinned composite panels. This type of material is commonly used for insulated containers because it provides good insulation properties while also being lightweight and durable. The aluminum skin provides protection and strength, while the composite panels provide insulation by trapping air between layers. This combination of materials makes it an ideal choice for keeping the contents of the container at a controlled temperature.

German circuit breakers are smaller compared to US circuit breakers because they are designed to handle higher voltage and less current draw. The higher voltage allows for a smaller size since it requires less insulation and spacing between components. Additionally, the lower current draw reduces the heat generated, allowing for smaller components and overall size.

The question is asking about the number of strokes required to prime a preway heater. The correct answer is 4 to 6, which means that it can take anywhere between 4 to 6 strokes to prime the heater. This suggests that the process of priming the heater may vary and can require a different number of strokes each time.

A noisy fuel pump in a field boiler can be caused by a suction line leaking. When there is a leak in the suction line, air can enter the system and mix with the fuel, causing turbulence and vibrations in the pump. This can result in a noisy operation. The other options, such as the pump rotating in the opposite direction, the pump being out of adjustment, or the contactor being defective, do not directly relate to the issue of a noisy fuel pump caused by a suction line leak.

The correct answer is "Three-phase, four-wire, 208/220-volt alternating current (VAC)." This means that the bare base air conditioner requires a power source that provides three-phase electricity, with four wires, and a voltage of either 208 or 220 volts. The use of alternating current (AC) is also specified, indicating that the power source should provide electricity that periodically reverses direction.

Operating the bare base air conditioner in the AUTOMATIC mode for cooling when the outside temperature is below 50°F may not be recommended because the air conditioner may not be able to effectively cool the room at such low temperatures. The AUTOMATIC mode is designed to maintain a comfortable temperature range, and at temperatures below 50°F, the air conditioner may struggle to achieve this. It is better to use other heating methods or adjust the settings manually in such conditions.

Turning the control knob counterclockwise increases the heat output on a preway heater. This is because counterclockwise rotation typically corresponds to increasing or opening the valve, allowing more fuel or heat to enter the system.

The high limit control is a safety control that only functions if the operating limit control fails on a field boiler. It is designed to prevent the boiler from exceeding its maximum temperature. If the operating limit control fails to regulate the temperature and it continues to rise, the high limit control will activate and shut down the boiler to prevent any potential damage or hazards.

The relief valve on a shower shelter boiler automatically relieves excessive pressure if the water pressure exceeds 50 pounds per square inch (psi). This means that if the pressure in the boiler goes above 50 psi, the relief valve will open to release the excess pressure and prevent any potential damage or accidents.

The hand operated air band is used to adjust for proper combustion. It allows the user to manually control the amount of air entering the combustion chamber, ensuring the right balance of oxygen for efficient and complete combustion. This adjustment is crucial for achieving optimal fuel efficiency and reducing emissions. Automatic operated air vents and air bands may not provide the same level of control and precision as the hand operated ones.

When the fuel pressure is too high (100 psi), the action to be taken is to reduce the pressure. To do this, the end cap should be removed from the side of the pump and the pressure regulating set screw should be turned counterclockwise until a proper reading is obtained. This will decrease the pressure and bring it to the desired level.

To remove the nozzle screen during repair, it is done by turning the screen counterclockwise by hand. This means that the screen should be rotated in the opposite direction of the clockwise motion. No additional tools such as a hexagonal wrench are required for this task.

The electrode rod on the low-water probe is inspected for scaling or deterioration. Scaling refers to the buildup of mineral deposits on the electrode, which can affect its performance. Deterioration refers to any damage or wear that may have occurred on the electrode rod. Regular inspection of the electrode rod is important to ensure that it is functioning properly and to prevent any potential issues with the equipment.

The correct answer is 0 to 35°F. This means that the 150 cubic foot refrigeration unit is designed to operate within a temperature range of 0 to 35°F.

Before the tent fabric is ready to be installed, five frame sections need to be assembled on the TEMPER tent.

During a normal defrost cycle, the defrost timer switch activates the solenoid valve, allowing it to open and deenergizes the fan motor, causing it to stop. This allows for the flow of hot air to defrost the evaporator coils, while preventing the fan from blowing cold air into the freezer.