TROUBLESHOOTING OBJECTIVE 6

What is a common cause of low airflow in HVAC/R systems?

• Dirty air filters

• High ambient temperature

• Excessive loading

• Oversized evaporator

What should be done if a fan belt is too narrow for the sheave?

• Inspect for wear

• Lubricate the bearings

• Adjust the belt

• Replace the fan

What can cause a frosted evaporator in HVAC systems?

• High ambient temperature

• Excessive airflow

• Dirty filters or fans

• Improper belt adjustment

What is the effect of dirty air filters on HVAC systems?

• Increased airflow

• Reduced system loads

• Improved efficiency

• Higher ambient temperature

What maintenance is required for fan blades?

• Frequent replacement

• Regular lubrication

• Pressure washing only

• No maintenance needed

What happens if the evaporator is oversized?

• Improved heat transfer

• Increased efficiency

• Higher than normal suction pressure

• Decreased airflow

What can cause excessive loading in refrigeration systems?

• Low ambient temperature

• Too much product being refrigerated

• Dirty air filters

• Improper fan speed

What is a sign of poor air distribution in HVAC systems?

• Frosted evaporators

• Closed dampers

• Dirty filters

• High ambient temperature

What should be done to prevent air leaking or bypassing?

• Increase fan speed

• Inspect and repair gaskets and seals

• Reduce airflow

• Change air filters more frequently

What is a common cause of dirty, plugged condensers?

• Excessive loading

• Improper fan operation

• Dirt or material in the fins

• High ambient temperature