Installation - PENN Controls - LIT-125118 - A25AN - A25CN - A25CP - Electromechanical Temperature Control - A25 Warm Air Limit Control

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

PENN Controls
Product name
A25 Warm Air Limit Control
Document type
Product Bulletin
Technical Bulletin
Document number
Part number
Document revision
Revision date


  1. Select a mounting location for the A25 in the duct (or plenum). The location must allow the sensing element to sense the average temperature in the duct.
  2. Drill (or cut) a 1-3/8 in. hole in the duct at the selected mounting location (refer to Figure 1).
  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 the marked locations.
  5. Secure the flange to the duct with two 1/2 in. (13 mm) No. 10 sheet metal screws provided.
  6. Insert the sensing element and sleeve through the flange installed in Step 5 (and into the duct).
  7. Secure the A25 to the flange by screwing the set screw firmly against the sleeve. Do not overtorque the set screw.
    Note: Insert the sensing element as far as possible into the air stream without allowing it to contact any object inside the duct. Provide at least 5-3/4 in. (14 cm) clearance between the sensor and any other objects inside the duct.
    Figure 1. Installing the A25