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 Sensitivity Maximum Temperature Limit of 190 F. Simple Installation Self-Sealing Factory Mounted Sampling Tube Mounting Hardware Included
Switch activates Duct Booster by sensing positive pressure on either plenum, trunk, or branch lines
SPECIFICATIONS: ELECTRICAL RATING: 278 VA Pilot Duty at 24 Volts AC 300 VA Pilot Duty at 115 to 277 Volts AC 15 AMPS Non-Inductive to 277 Volts AC ELECTRICAL SWITCH: SPST, N/O, Snap Action Contacts, Non Adjustable OPERATING PRESSURE / POSITION: On pressure rise at +.05 + .02" W.C. (Diaphragm Vertical) MAXIMUM PRESSURE: 1/2 PSI OPERATING TEMPERATURE RANGE: -40 to 1900 F. SAMPLING TUBE: Self-sealing, factory mounted tube DIMENSIONS: 5 3/4" H X 3 1/4" W X 3"D
LOCATION 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 minimal air leakage.
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
Works as designed. I put it near the end of a long run and my furnace fan is set on low. Sometimes it did not sense the pressure. I found if you ship the top out a bit, while still insuring the probe is sealed to the duct, it becomes more sensitive.
1/13/2010
3.0
Hopefully the second one last longer
By cphillips
from Cleveland, OH
About Me Handyman, Homeowner
Pros
Sleek Design
Cons
Instructions
Longivity
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
I'm new to the pressure switch market and how-to install them. For me, the instructions are far too vague and do not give enough information install on a step-by-step bases. After some head scratching and browsing on the internet, I found the missing pieces to help me through the installation. As for the product, this is my second one. The first lasted, a little less than a year. I'm not sure if this is normal, but I would have expected a little longer life out of a product that I only really use on the colder days.
12/5/2009
5.0
Works Great
By KenK
from RI
About Me Handyman
Pros
Easy To Install
Cons
Best Uses
Large Rooms
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
It was able to sense a pressure difference at the end of a long run of duct work, where I put a inline duct fan saved me from running wire to the furnace some 70 feet away, good stuff!
9/1/2009
5.0
performed exactly as needed.
By Don
from ohio..
About Me Homeowner
Pros
Cons
Works great
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
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4/22/2009
(1 of 1 customers found this review helpful)
4.0
Switch used with duct booser
By stlmaj
from Newmelle, MO
About Me Homeowner
Pros
Convenient
Cons
Instructions not clear
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
Product works good. Had to install it vertical and took some positioning to get it to fuction properly.
3/23/2009
(1 of 1 customers found this review helpful)
4.0
Good product so far
By Cal
from Maplewood, MN
About Me Homeowner
Pros
Easy To Install
Cons
None
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
I'm using this with a Fantech fan to boost more airflow to a bonus room above our garage. So far, it works very well turning the fan on and off when the furnace blower turns on and off. Pretty easy to install as well. I wired a wall plug to it and ran the other end from the unit to the air booster.
3/19/2009
(1 of 1 customers found this review helpful)
4.0
Works great
By bmwmchugh
from New Jersey
About Me Handyman, Homeowner
Pros
Easy To Install
Cons
None
Best Uses
Control duct fan
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
I have it controling a in line ductfan and it turns the fan on and off every time.
1/21/2009
(2 of 2 customers found this review helpful)
4.0
Works fine but plan placement well!
By Beetroot
from McHenry, Illinois
About Me Handyman, Homeowner
Pros
Easy To Install
Cons
Poor location instruction
Best Uses
Power for duct booster
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
Installed with a duct booster. My first install location (convenient for power hookup) turned out not to have enough air pressure to activate switch! I had to rewire all the way to the main Trunk Line! 50+ feet away from the Booster! Instructions should have warned about air pressure requirements and included some examples. 14 Gauge wire Barely fit in the small contacts and was quite frustrating. But it works Great! Just another example of "Live and Learn"
1/13/2009
(2 of 2 customers found this review helpful)
4.0
Works great
By Chef Mesch
from Dallas, Texas
About Me Homeowner
Pros
Easy To Install
Cons
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
Easy to install. Power terminals could be easier to connect--screws and wrap around are really small.
12/2/2008
(1 of 1 customers found this review helpful)
4.0
This unit works well and accurately
By Dan
from Chicago IL
About Me Handyman, Homeowner
Pros
Easy To Install
Quiet
Cons
Energy Inefficient
Best Uses
Comments about Tjernlund Duct Airstat Positive Pressure Duct Fan Switch (PS1503):
Product works great but is a little large and heavy, could be smaller
