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A25 Series Warm Air Control with Manual Reset Product/Technical Bulletin
Figure 3: Terminal Identification for
A25CN and A25CP SPDT Models
Figure 4: Typical Wiring Diagram of
A25CN and A25CP SPDT Models
Figure 5: Terminal Identification for
A25AN and A25AP SPST Models
Figure 6: Typical Wiring Diagram for
A25AN and A25AP SPST Models
C
heckout Procedure
After installing the A25, perform the following
procedures. Observe at least three complete
operating cycles to verify that all components are
functioning properly. If the unit fails to checkout, refer
to the troubleshooting chart (Table 2). Do not attempt
to make adjustments.
Return Air Applications
1.
After completing the installation and wiring
procedures, turn on the power to the circuit.
2.
Turn the setpoint knob counterclockwise until
the A25 shuts down the system.
The A25 should lockout and 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 should happen.
4.
Press the reset lever.
The system should restart and the alarm or
signal (if applicable) should shut off.
Supply Air Applications
1.
After completing the installation and wiring
procedures, turn on the power to the circuit.
2.
Raise the supply air temperature to the
setpoint temperature.
Note:
The supply air temperature can be raised
by simulating a fan failure or restricting the
return air flow.
3.
When the system shuts down, determine the
temperature at the A25 sensing element.
The temperature reading should closely
approximate the A25’s setpoint at which the
system is shut down and (if applicable) the
alarm or signal is activated.
4.
Return the system to normal operation by
re-establishing air flow or by restarting the fan.
5.
Press the reset lever.
The system should restart and the alarm or
signal (if applicable) should shut off.
