Blowers
A blower assembly typically includes the motor, hosing and this rotating component which moves the air
What is the blower wheel?
This is the path air takes into the furnace before being heated or cooled
What is the return air?
How air moving through ductwork is measured
What is CFM?
A furnace's temperature rise is calculated by measuring the difference between the air temperature in these two locations
What are the return and supply ducts?
400 CFM
What is the recommended amount of airflow per ton of cooling?
The lowest point of pressure in the air system
What is the inlet of the blower?
These openings can be adjusted to control the flow of air to a given space
What are dampers?
The static pressure at which you should change your filter
What is 0.25 to 0.3" w.c.?
Too little airflow across this furnace component can cause it to overheat and trip the high-limit switch
What is a heat exchanger?
Too much airflow across the evaporator coil can cause this comfort issue for occupants
What is poor dehumidification?
If it has this, you are working on a PSC motor
What is a capacitor?
Ideal range is between 0.5 and 0.75" w.c.
What is total external static pressure?
Used to neutralize viruses, bacteria, and other contaminants in the air
What is a UV Air Purifier?
If not installed correctly, this can cause hot air to circulate into the return and cause over-heating.
What is bypass humidifier?
A common occurrence when temperatures inside the ducts are low, and the space in the basement has high humidity
What is condensation on the ducts?
When your ECM motor fails, this component may be the issue, and not the motor
What is the ECM module?
This system uses an additional board to direct airflow to specific spaces with different heating & cooling demands
What is a zone system?
Used to polarize small particles in the airflow
What is a PMAC filter? (polarizing media air cleaner)
150 CFM for 90% Efficiency and
130 for 80% Efficiency
What is the recommended CFM for every 10,000 btu of heating?
Low suction pressure. Low superheat, but high temp drop.
What are signs of low indoor airflow (or low heat load)?
If a blower's amp draw is too high, possible causes can include dirty filters, excessive duct restrictions or this blower-related problem
What is a worn or misaligned blower wheel / motor?
Dip switches, wire terminals, LED menu, UI controls, and manufacture app
What are the methods to make airflow adjustments on an HVAC system?
To improve IAQ, humidity should be kept within this percentage range.
What is 40-60% RH?
In a multi-story home has insufficient return air on the upper floors, this airflow issue can occur, causing rooms to feel cooler. Felt strongest in heating season.
What is the stack effect?
High suction & discharge pressure, but with high superheat and low subcool AND low temp drop
What are indicators of low outdoor airflow / dirty condenser coil?