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A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin 

Models A25AP and A25CP 

Setpoint Adjustment: 

 Loosen the cover screw 

(Figure 8) and remove the cover.  Adjust the 

setpoint by rotating the adjusting screw.  When 

adjusted, re-install the cover.  Tighten cover 

screw. 

Test Procedure: 

To test (trip) the A25:

  Raise the temperature 

at the sensor above the setpoint or lower the 

setpoint below the ambient temperature.  

The 

control should lockout (trip). 

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). 

Reset Procedure:

  Verify that the temperature 

has dropped 20F° (11C°) below setpoint.  Press 

the reset lever to reset the A25 (closing the 

circuit). 

 

 

 

Figure 8:  Models A25AP and A25CP    

 

 

 

 

D

imensions 

 

Figure 9:  A25 Dimensions, in./mm  

Summary of Contents for A25 Series

Page 1: ...ntrol 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 Rese...

Page 2: ...ng location refer to Figure 2 3 Using the flange as a template on the duct mark the location for two 1 2 in 13 mm No 10 sheet metal screws 4 Punch or drill both sheet metal screw holes in the duct at...

Page 3: ...ncrease The red to blue circuit opens on temperature increase Refer to Figures 3 and 4 for terminal identification and typical wiring connections When the reset lever is pressed during normal operatio...

Page 4: ...nd the alarm or signal if applicable should activate Note The setpoint at shutdown should equal the approximate duct air temperature 3 Turn the setpoint knob clockwise to the desired setpoint Nothing...

Page 5: ...the sensor above the setpoint or lower the setpoint below the ambient temperature The control should lockout trip To reset after test Lower the temperature at the sensor to 20F 11C below the setpoint...

Page 6: ...the sensor above the setpoint or lower the setpoint below the ambient temperature The control should lockout trip To reset after test Lower the temperature at the sensor to 20F 11C below the setpoint...

Page 7: ...n The A25 is not sensing properly The sensing element may not be extended into the airstream or the sensing element is contacting an object inside of the duct or plenum Insert the sensing element as f...

Page 8: ...8 A25 Series Warm Air Control with Manual Reset Product Technical Bulletin Notes...

Page 9: ...e reset when the temperature drops 20F 11C below the dial setting Sensing Element Bi metal rod and tube construction Shipping Weight Individual pack 1 8 lb 0 8 kg Overpack of 12 units 23 lb 10 4 kg Wi...

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