2
A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin
A
pplication Overview
A typical 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.
I
nstallation
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 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 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 2: Installing the A25
