Quote:
Originally Posted by VatorMan
DDC is so much better than pneumatic. Leaky bastards. We have to run 3 compressors to keep up with air demand. Energy nightmare.
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Cut my teeth on pneumatics, they work for years as long as the aftercooler is working. Death of a pneumatic systems is oil and water carryover. Plus they are truly an "open" system with anyone's direct or reverse acting thermostat being interchanged. Or a damper or valve actuator could be replaced with another manufacturer (JCI, Honeywell, BC, Robertshaw)...as long as you had the right spring range. Lighting certainly didn't hurt them and no one could hack in.
When the first DDC systems came out and we were doing hospital work, the engineers weren't confident that the DDC system would work so we had to install a redundant pneumatic system plus the electronic system.
Now all we install is electronic and I'm the only one that can tell the youngsters what to rip out in the old control panels!