Pneumatic thermostat for proportional control of pneumatic valves and actuators with one- or two-pipe systems. Available with two cover options, the TP9600 is not only affordable and easy to install, but it controls temperature with the reliability that only Honeywell can provide.
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Q:I purchased a couple new tp9603A1001 and used as a replacement of older stats. There is a hissing at the stat when turned down to lower temps and when I turn it up to 80 or so it stops but the its calling for heat. I have others that are installed around the building and they do not hiss on lower temps.
A:The thermostat(s) could be defective.