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Description
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
Enables 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
LIT-125118 24-7664-656 Rev. C
2021-09-29
A25 Series Warm Air Control with Manual
Reset Product/Technical Bulletin
A25AN, A25CN, A25CP
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Table of Contents
Related Manuals for Penn A25 Series
Summary of Contents for Penn A25 Series
- Page 1 A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin Description 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.
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Page 2: Application Overview
Enables the A25 to be used with many applications Application overview A standard application for the A25 Series Warm Air Control with Manual Reset is to stop the operation of air conditioning or ventilating fans upon a temperature rise. Models A25AP and A25CP are Factory Mutual approved for use as fire protection devices. - Page 3 Important: Only use the terminal screws furnished with the A25 (8-32 x 1/4 in. binder head). Use of other screws will void warranty, may damage switch terminals, and result in improper connections. Figure 3: Terminal identification for A25CN and A25CP SPDT models A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin...
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Page 4: Checkout Procedure
Turn the setpoint knob clockwise to the desired setpoint. Nothing should happen. Press the reset lever. The system should restart and the alarm or signal (if applicable) should shut off. A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin... - Page 5 To reset after test: Lower the temperature at the sensor to 20F° (11C°) below the setpoint or raise the setpoint to 20F° (11C°) above the ambient temperature. Press the reset lever. The A25 should reset (closing the circuit). A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin...
- Page 6 A25 Series Warm Air Control A25AN-1 SPST, opens on temperature rise, setpoint knob adjustment. with Manual Reset A25CN-1 SPDT, setpoint knob adjustment. A25CP-1 SPDT, concealed screwdriver adjustment, Factory Mutual approved. A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin...
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Page 7: Troubleshooting
The A25 is defective. Replace the A25. temperature. A25 will not reset. The temperature in the duct (or plenum) Check system for overheating or fire. is not 20F° (11C°) below the setpoint. A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin... -
Page 8: Technical Specifications
Technical specifications Table 3: A25 Series Warm Air Control with Manual Reset technical specifications Specification Description Product A25AN-1: SPST, opens on temperature rise, setpoint knob adjustment. A25CN-1: SPDT, setpoint knob adjustment. A25CP-1: SPDT, concealed screwdriver adjustment, Factory Mutual approved. Range 25 to 215°F (-4 to 102°C)
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