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Switch, Duct Pressure

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List Price: $79.59
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  • Duct Pressure Switch
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Frequently Bought Together

Switch, Duct Pressure + Tjernlund DB-2 Duct Booster, Increases Heating and Cooling Power, 275 CFM
Price for both: $124.89

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Product Information

Technical Details
Part Number PS1503
Item Weight2 pounds
Product Dimensions6.7 x 6.4 x 6.3 inches
Item Package Quantity1
  
Additional Information
ASINB002EC1O0C
Best Sellers Rank #34,279 in Home Improvement (See top 100)
Shipping Weight1.4 pounds (View shipping rates and policies)
Date First AvailableJune 23, 2009
  
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Product Description

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. FEATURES:High SensitivityMaximum Temperature Limit of 190 F.Simple InstallationSelf-Sealing Factory Mounted Sampling TubeMounting Hardware Included Switch activates Duct Booster by sensing positive pressure on either plenum, trunk, or branch linesSPECIFICATIONS:ELECTRICAL RATING:278 VA Pilot Duty at 24 Volts AC300 VA Pilot Duty at 115 to 277 Volts AC15 AMPS Non-Inductive to 277 Volts ACELECTRICAL SWITCH:SPST, N/O, Snap Action Contacts, Non AdjustableOPERATING PRESSURE / POSITION:On pressure rise at +.05 + .02" W.C. (Diaphragm Vertical)MAXIMUM PRESSURE:1/2 PSIOPERATING TEMPERATURE RANGE:-40 to 1900 F.SAMPLING TUBE:Self-sealing, factory mounted tubeDIMENSIONS:5 3/4" H X 3 1/4" W X 3"DLOCATION AND MOUNTING:1. The duct Airstat must be mounted in a vertical position.2. Drill a 11/32" hole in the duct or plenum to permit the insertion the pressure probe. If furnace has central air-conditioning, care must be taken so as not to drill into the cooling coil when mounting the Duct Airstat on the furnace plenum.3. Insert the pressure probe into the drilled hole, position the Duct Airstat and mark the mounting holes. If necessary, bend the mounting feet with pliers to match the contour of the duct or plenum.4. Remove control and drill or punch two 1/8" holes for mounting screws.5. Using the two sheet metal screws furnished, fasten the Duct Airstat to the duct or plenum. Sealing gasket must be mounted on pressure probe to ensure minim

Customer Questions & Answers

Customer Reviews

Hopefully it lasts a long time.
Amazon Customer
Then the positive pressure from the main blower would turn it back on again (on, off, on, off, and so on).
R. Cardosi
Also customer service was no problem about answering a simple question that I had.
C. F. White

Most Helpful Customer Reviews

11 of 12 people found the following review helpful By Jimmy Adams on August 4, 2013
Verified Purchase
Used this product to turn on booster fan in duct to my sons room. The wiring instructions are horrible and not clear at all. Easy to install but a pain in the ass to wire up. When you are wiring this thing up for 120V AC, there are 4 posts on the duct stat: Common, normally closed, normally open and ground. Well your ground from house goes to ground connection on stat and then ground leaving stat to your fan, thats easy, next was the hard part, the hot wire from the house goes to the "common" connection on the duct stat in case your wondering, then the wire leaving the stat comes off the "normally open" (no electricity flow) connection from the stat to your fan. So when the pressure in the duct trips, the normally open (no electricity flow) will then become closed (allow electricity flow) to your fan. The white common wire from the house bypasses the duct stat switch altogether (do not wire to common on switch) and just wires directly to the booster fan. Whoalla it works. How hard is it to put this all on a wiring diagram that makes sense. Anyways, booster fan works wonderfully (suncourt 10"-600 cfm). Easily picks up duct pressure to turn on booster fan when furnace blower comes on. Hope this helps any future people who are trying to wire up booster fan.
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4 of 4 people found the following review helpful By Matthew VanZante on December 16, 2012
Verified Purchase
I bought this product to use in conjunction with a duct booster fan. It works great and comes on every time the hvac blower runs. One thing you have to be mindful of with an installation like mine, though, is to locate the switch a fair distance "upstream" from the duct fan. Otherwise, when the duct fan turns on, it sucks out the pressure and the switch turns off, thus the fan cycles on and off. In my case the distance was about 6 feet back on the duct, but I have a few 90-degrees in there that effectively keep the pressure higher.
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3 of 3 people found the following review helpful By GoDark on August 16, 2013
Verified Purchase
I've recently tried four Tjernlund products in an attempt to solve a problem of inadequate air supply on the return and supply sides of my HVAC system. THIS ONE IS A WONDER. I've installed two S&P TD-200S 8" mixed flow duct booster fans on the return side and one Tjernlund DB-2 centrifugal duct booster fan on the supply side. Two of the fans are in an attic storeroom. For all of them, the issue was how to wire them so that they turn on when the system turns on and turn off when the system turns off. There are two options: (1) wire the fans to the HVAC air handling unit ... but there are cautions in the HVAC documentation about frying the electronics if you try this; and (2) use the Tjernlund Pressure Switch that closes the circuits when the supply side ducts pressurize and reopens when the system turns off and the pressure drops. (NOTE: there is not enough pressure in the ducts on the return side to operate the switch.) Using the switch in the attic storeroom eliminated the problem of figuring out how to run wiring down three floors to the HVAC air handling unit in the basement perchance it was even possible to wiring the fans to the HVAC console. It takes only 10 to 15 minutes to install one of these switches. I don't know of any other source than Tjernlund for a pressure sensitive duct fan switch.
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2 of 2 people found the following review helpful By Dale Straughn on May 10, 2013
Verified Purchase
I installed it close to the air handler so that it would control a duct booster fan located at the other end of the duct work. So far it has worked to turn on the duct booster fan every time the main fan has come on. It was easy to install. The only negative I have is that the instructions were not real clear on the mounting position. They say do not mount horizontally, but its hard to tell by the picture drawings exactly what vertical is. I took a logical guess and it was apparently correct. I have not had it long. I am hoping it is durable. It looks to be well made.
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2 of 2 people found the following review helpful By Rex L. Jensen on December 18, 2012
Verified Purchase
I love it. It works as advertised. Highly recommend it. Right now it is controlling one duct booster. I plan on connecting a second duct booster soon. A Can Max Fan which I like better than the Tjernlund duct booster.
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1 of 1 people found the following review helpful By Jeff on May 2, 2014
Verified Purchase
It was easy to install, very simple and works every time! The instructions are not very clear, but it was pretty self explanatory.
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Verified Purchase
This was a good product, but the cost seemed a bit steep (I paid around $50 for it). Also, beware: for my application it turned out to be unusable. I had it installed in the trunk of a central heating unit (very close to the main blower) to control some booster fans. As it turned out, the several booster fans were so powerful that they sucked the air faster than the main blower could push it; As soon as the booster fans came on they created negative-pressure in the duct, so the pressure switch would turn off. Then the positive pressure from the main blower would turn it back on again (on, off, on, off, and so on). I wound up abandoning the pressure switch and just having the boosters wired directly with the main blower. It would have been nice if the pressure/sensitivity was adjustable, but the product does work as designed so I can't complain.
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By healeysteve on December 15, 2014
Verified Purchase
I installed this to switch on a duct booster fan. My furnace/AC unit has two zones (1st floor/2nd floor) controlled by dampers on the two main ducts (one to each floor) which then have numerous branch ducts. I placed the switch downwind of the 1st floor damper near where the branch duct with the booster fan takes off. The switch works perfectly sensing the air flow coming on in the 1st floor main duct and not coming on when the second floor is getting heat or AC.
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Most Recent Customer Reviews