Tjernlund PS1503 Positive Air Flow Pressure Switch
The Tjernlund Duct Airstat senses positive pressure in a forced air heating and/or cooling system. The single pole, single throw, snap-acting switch is activated by a diaphragm with a factory installed sampling tube inserted directly into the duct or plenum.
The Duct Airstat can be used to initiate such auxiliary devices as: Duct Boosters, Electronic Air Cleaners, Electrical Duct Heaters, and Humidifiers. The electrical contacts of the switch are closed upon sensing positive air pressure generated by the blower.
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|#1||Q: How much airflow is need in the duct to actuate the switch?
A: It will activate on a pressure rise at .05 +/-.02 W.C. with the diaphragm in vertical orientation.
Asked on 2014-02-22 by Joe
|#2||Q: Why does the switch make the fan cut on and off instead of staying on constant while the unit is on?
A: It is supposed to run constantly, but if it is a quick intermittent cycle then the switch is likely not in the right orientation. Try rotating it to see if that stops the cycling.
Asked on 2013-07-23 by Curtis
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