4th Qtr Review

-+

When performing an air temperature rise test you should let the appliance run at least how long?

• 5-10 minutes

• 10-15 minutes

• 15-20 minutes

• 20-30 minutes

When performing an air temperature rise the supply air temperature should be taken several feet away from _________________.

• A supply outlet

• radiator

• return air intake

• heat exchanger

If you are too close to the low end of the temperature rise, the air coming off the furnace will feel _______________.

• to hot

• to cold

• just right

• uneven

If you are too close to the low end of the temperature rise you may start to form________________.

• Condensation

• Steam

• Heat

• nothing at all.

When we are near or over the high-end of the temperature rise the furnace may begin cycling on and off the ________________.

• Thermostat

• Inducer motor

• Flame sensor

• Limit

When the temperature rise is too high, you are not moving enough air over the ________________.

• Evaporator Coil

• Thermostat

• Heat Exchanger

• Supply air outlet

You can estimate air flow by measuring _______ across the coil and the filter.

• Temperature Rise

• Static Pressure

  Drops

• Static Pressure

• Airflow

When a cooling system is operated during low outdoor temperatures, the condensing _______ and head pressure will drop.

• pressure

• temperature

• line

• coil

Low _______ will often result in a partially frozen coil rather than a full block of ice.

• Pressure

• Temperature

• Air Flow

• Refrigerant

Low load is often due to low _______ ,low indoor ambient conditions and equipment oversizing.

• Air Flow

• Refrigerant

• Suction Pressure