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: Hi,Does the pressure switch have a timer to keep the booster running for x minutes? Otherwise wont the pressure drop immediately when the downstream booster kicks in (and then shut it off)? A: It does not have a timer. It depends on some positive pressure remaining at the discharge of the furnace (which there typically is) when the booster kicks in. Its meant to be positioned on the discharge plennum of the furnace. If you need a delay then look at the Fantech DB 10 switch. Asked on 2019-12-24 by Roy |
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| #2 | Q: How many inline booster fans can be used with a single pressure switch? A: The switch has a 15 amp max current switching capability. The amount of fans depends on the amp rating of each fan. Asked on 2017-08-26 by W Dallas |
| #3 | Q: Can the switch be installed on/in flexible duct? A: Most likely not practical, as you would have issues sealing the hole in the flexible duct to the pressure switch. Asked on 2017-06-18 by Scott |
| #4 | 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 |
| #5 | 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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