Here are some items that have been requested recently please let me know what you would like added. My email is [email protected]
1) end-user training
2) wiresheet programing
3) difference between ball and linear valves
4) information about Visio shapes and stencils.
Team, I have relocated to New Springfield, OH, and I am serving the Ohio Valley, Youngstown, OH, and Pittsburgh, PA areas.
https://fixedusa.net/
An Article by David Smith of HVAC.Locals.com published on January 8, 2021.
With all the use of economizers, demand ventilation, or minimum required fresh air being utilized in systems today, the possibility of over-pressurization is a real possibility.
While a slightly positive state within the building envelope is desirable in most cases, as this helps to keep dirt and odors from outside from infiltrating.
More to come soon.
Image source https://en.wikipedia.org/wiki/Positive_pressure#/media/File:Positive_Air_Pressure.png
I had a job recently that was using a third-party graphic displaying a point that the last two letters ended in the name PV that when overridden was writing to an associated source of the point that the last two letters ended in the name CV. The point ending in CV was an output that the system operator would have to be able to override. The output would typically control a valve, fan start/stop, or damper for instance.
I found that the output point ending in CV would error in the Niagara FOX as a write error if the associated CV point were not in override or in manual before being overridden. To resolve this issue, I added a StatusDemux from the kit control pallet to resolve this issue. The first image shows the point in its normal state and the second image shows the point when overridden.
