A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin
7
R
epairs and Replacement
Do not make field repairs. For a replacement control,
contact your nearest Johnson Controls representative.
Table 1: Ordering Information
Item Product
Code
Number
Product
Description
A25 Series Warm Air Control
with Manual Reset
A25AN-1
A25AP-1
A25CN-1
A25CP-1
SPST, opens on temperature rise, setpoint knob adjustment.
SPST, opens on temperature rise, concealed screwdriver adjustment,
Factory Mutual approved.
SPDT, setpoint knob adjustment.
SPDT, concealed screwdriver adjustment, Factory Mutual approved.
T
roubleshooting
Table 2: Troubleshooting Chart
Symptom Problem Solution
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 far as
possible into the airstream without
allowing it to contact any object inside the
duct (or plenum).
The system does not operate.
Incorrect switch connections or improper
wiring.
Damaged sensor.
The A25 is tripped.
Ensure that the wiring connections follow
the wiring diagrams in the
Wiring
section.
Check connections.
Replace the A25.
Reset the A25.
A25 does not lockout upon a
temperature rise beyond the setpoint.
The A25 is defective.
Replace the A25.
The A25 does not sense the correct air
temperature.
The A25 is defective.
Replace the A25.
A25 will not reset.
The temperature in the duct (or plenum) is
not 20F° (11C°) below the setpoint.
Check system for overheating or fire.
