Tjernlund PS1503 Duct Airstat Fan Proving Switch Rev A 10/99 - Manual

MODEL PS1503
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 integral
pressure probe 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.
TYPICAL MOUNTING LOCATIONS & APPLICATIONS
A
B
Trunk Line
Plenum
115-120V
Duct
Airstat
Duct
Booster
Electronic
Air Cleaner
Electronic
Duct Heater Humidifier
Duct Booster
Branch
Run
WIRING:
All wiring must agree with applicable electrical codes
and ordinances. Typical diagrams are shown below.
SWITCH MUST BE
MOUNTED WITH
DIAPHRAGM IN
VERTICAL POSITION
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
SIDE VIEW TOP VIEW
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 inser-
tion the pressure probe. If furnace has central air-condi-
tioning, 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.
OWNERS
INSTRUCTIONS
DO NOT DESTROY
DUCT AIRSTAT INCLUDES:
1. A fixed “fan-on” setpoint
(+ .05 + .02” W.C.)
2. Integral pressure probe
3. Sealing gasket
4. Mounting hardware
INSTALLATION:
CAUTION
1. Disconnect power supply before making wiring
connections to prevent electrical shock and
equipment damage.
2. All wiring must comply with applicable codes and
ordinances.
3. Always conduct a thorough checkout when installa-
tion is complete.
SEALING
GASKET PRESSURE
PROBE