Mosanada FMS Assistant Engineer Interview Questions, Process, and Tips for Experienced

PPM stands for Planned Preventative Maintenance. It should be done every 3-6 months for chillers, AHUs, pumps, and other equipment.

• PPM is a proactive approach to maintenance to prevent breakdowns and prolong equipment life.

• Chillers, AHUs, pumps, and other critical equipment should undergo PPM every 3-6 months.

• Regular PPM helps in identifying potential issues early and ensures optimal performance of the equipment.

• PPM in...read more

There are mainly two types of pumps used in HVAC systems: centrifugal pumps and positive displacement pumps.

• Centrifugal pumps are commonly used in HVAC systems for circulating water or other fluids. They are efficient and have a simple design.

• Positive displacement pumps are used for applications where a specific flow rate is required, such as in hydronic heating systems.

• Other types of pumps used in HVAC systems include...read more

Check the pump motor temperature by touching the motor housing.

• Touch the motor housing with your hand to feel for excessive heat

• Use a temperature gun to measure the motor temperature

• Check for any unusual smells or sounds coming from the motor

• Monitor the motor's temperature gauge if available

When the pump motor is heated, it can lead to decreased efficiency, increased wear and tear, and potential damage to the motor.

• Decreased efficiency: Heat can cause the motor to work harder, leading to decreased efficiency in pumping water.

• Increased wear and tear: Excessive heat can accelerate the wear and tear of the motor components, reducing its lifespan.

• Potential damage: If the motor overheats, it can lead to perman...read more

The AHU belt size can vary depending on the specific model and manufacturer of the air handling unit.

• AHU belt size is typically specified by the manufacturer in the unit's documentation.

• It is important to refer to the AHU's manual or contact the manufacturer for the exact belt size needed.

• AHU belt sizes can range from small belts for residential units to larger belts for commercial or industrial units.

A chemical dosing system in a chiller is used to introduce specific chemicals into the water to prevent scaling, corrosion, and biological growth.

• It helps maintain the efficiency and longevity of the chiller system.

• Chemicals like corrosion inhibitors, biocides, and scale inhibitors are commonly used.

• The dosing system carefully controls the amount of chemicals added to the water based on the chiller's requirements.