Product Overview

FANs 125, 121
Product/Technical Bulletin A25
Issue Date 0796
© 1996 Johnson Controls, Inc.
1
Part 24-7664-656, Rev.—
Code No. LIT-125118
A25 Series Warm Air Control with Manual Reset
The A25 Series Warm Air Control with Manual Reset is
designed to shut down fans, burners, dampers, etc.,
when the temperature of the sensed air becomes
greater than the controller’s setpoint.
When the sensed temperature increases to the
controller’s setpoint, the A25’s switch will open.
Manual reset is required to reclose the electrical circuit.
The A25 may be used as a high limit control in the
supply air duct (or plenum) where a lockout type
control is desired or required by local code.
Figure 1: The A25 Series Warm Air Control
with Manual Reset
Features and Benefits
Trip-free Reset Lever Does not allow the reset switch to hold the contacts in a closed (on)
position
Pilot Duty Electrical Rating for
up to 600 Volts Maximum
Allows direct control of high voltage motor starters
Enclosed Switch Protects switch contacts from dust
Rod and Tube Sensing
Element
Provides maximum response and allows for a high maximum
sensing element temperature
Adjustable Duct
Mounting Flange
Controls the depth of sensor insertion into the airstream;
compensates for insulation depth
Wide Temperature Range Allows the A25 to be used with many applications

Summary of content (8 pages)