TJERNLUND MODEL
PS1503
POSITIVE AIR FLOW PRESSURE SWITCH
FEATURES
High Sensitivity
Maximum Temperature Limit of 190
0
F.
Simple Installation
Self-Sealing Factory Mounted Sampling Tube
Mounting Hardware
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.
Switch actuates air
cleaner by sensing
positive plenum pressure.
Switch activates humidifier
by sensing positive plenum
pressure.
Switch proves operation
of blower by sampling
positive pressure.
ELECTRONIC AIR CLEANERS
HUMIDIFIERS
FAN OPERATION
Switch activates Duct Booster by sensing positive pressure on either plenum, trunk, or branch lines as shown in Figures A and B above.
A
B
TYPICAL MOUNTING LOCATIONS & APPLICATIONS
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 190
0
F.
SAMPLING TUBE:
Self-sealing, factory mounted tube
DIMENSIONS:
5” Diam., 5 1/2” Across Bracket, 3” High
GENERAL SPECIFICATIONS
Distributed By:
Trunk Line
Plenum
115-120V
Duct
Airstat
Duct
Booster
Electronic
Air Cleaner
Electronic
Duct Heater
Humidifier
Duct Booster
Branch
Run
© 1997 Tjernlund Products, Inc.
P/N 8500130 Rev. A 4/99
TYPICAL APPLICATIONS
SWITCH MUST BE MOUNTED
WITH DIAPHRAGM IN
VERTICAL POSITION
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
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