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    twister10's Avatar
    twister10 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Apr 7, 2009, 08:48 PM
    Pneumatic termostat
    Dose any one knows how a pneumatic thermostat work?
    And the compressor attach to a air handel unit
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Apr 8, 2009, 07:24 PM
    Pneumatic and hydrolic thermostats and there associated pumps and selonoids/relays are a speciality item usually only encountered in commercial HVAC settings. I am very well versed in these controls but I do not feel like writing a book to cover exactly how they work. You might do a Google and search for a manufactures web site which will have a detailed diagram and other information for you.
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
    Ultra Member
    		  
    #3

    Apr 9, 2009, 08:20 PM

    Pneumatic thermostats function in a number of different ways, one way is by sending air pressure to or relieving pressure from a pneumatic actuator or water valve to allow hot or cold water through a coil in the air stream or open or close a damper in the duct to allow or disallow hot or cold air to pass through duct, this is only a few ways they may work and also become very sophisticated.
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