Airflow and Indoor Unit Information
Use at least one of the following methods to verify required cfm for outdoor unit operation. Using 2 methods is better then using just 1. Just in case something does not look correct. The goal is 350 cfm per ton.
If your system is using a User Interface (touchscreen)
Go into the service menu by pressing and holding the service hat icon until it turns green. Then select the installation option, the select the blower assessment test, start the test, it will take about 3 mins to complete, once the test is complete record the information below
Record the static pressure with a manometer. Measure the return and the supply separately and then add together to get the total static. Forget the + and - and just add the numbers together. Example +.5 measured in the supply and -.3 measured in the return = .8 in wc Total static. Reminder this is a Blower, not a sucker.
Place the unit in emergency heat and run for about 10-15 minutes while you are gathering your measurements, yes even on a 90 degree day. Take the blower door off and measure the High Voltage going to the Fan Coil (you can also get this in the disconnect), after the door is OFF, measure the amp draw of L1 or L2 coming into the fan coil, total system amp draw, while the door is off get an amp draw of the fan motor. Then place the door back on the unit and measure the temperature split of just the elec. heat at the fan coil.
Electric Heat formula for Residential CFM
VOLTS X AMPS X 3.41 / 1.08 / Elec heat temperature split = CFM
Indoor heat pump operating temperature split
Once the information has been reviewed, a Customer Assurance Manager will reach out to assist you.