A25 warm air control is typically located in a return air duct and wired to shut down air conditioning or ventilating fans when air temperature rises to the control setpoint. Reset manually before electrical contacts can be reclosed.
A28AK two-stage temperature control features a special air coil sensing element and adjustable mounting flange. Use these duct thermostats with all types of rooftop units, make-up heaters, duct heaters, and air handling systems.
For more information on the A25 and the A28AK, ask your friendly, experienced PENN team.