Measuring depressurization caused by exhaust devices, air handlers and door closures is not something new in the field of building science. The Energy Conservatory has had a procedure in our blower door manual for over 20 years. There are many recommended procedures and protocols out there but they all require documenting changes in pressure. If you want to diagnose solutions to depressurization issues, you will want to document incremental pressure changes as each additional exhaust appliance is turned on. You will also want to document the effects of the air handler and door closures.
Using the TEC WiFi Link with the iTEC-700 iOS or Android app has made this documentation easier. You can leave the DG-700 in the Combustion Appliance Zone (CAZ) and view the changes in pressure caused by turning on exhaust devices on a phone or tablet via a WiFi connection. To document these changes, use iTEC-700 to change the readings to a 10-second average, and then take a screenshot of the results at each step.
If you already have a computer in the field, an even better way to document pressure changes at each step is to use our free TECLOG3 software. TECLOG3 can display and record real-time CAZ-to-outside and water heater vent pressures. You can easily add and label event markers in the software or create periods of record that will calculate long term averages of these pressure changes.
A few months ago we did a webinar on wireless CAZ testing. The first half of the webinar is a wireless CAZ test using iTEC-700, and the second half demonstrates how you can use TECLOG3 to add periods of record, event markers, etc. You can watch it on YouTube here.
If you have any questions about the TEC WiFi Link, CAZ testing or TECLOG3 please email Paul Morin at firstname.lastname@example.org.