The Notifier by Honeywell line of products consists in general of fire detection systems. Notifier makes fire alarms, control panels, gas detection systems, and integrated notification, management, and alarm systems.

Fire detection systems

includes infrared, ultraviolet, and visible light reconnaissance systems excluding radar systems such as bomber-defense equipment, weapon fire control equipment, infrared fuses, infrared detection

Control systems are synchros which are used in error detection. They provide a voltage to be converted to torque through an amplifying method.

They can be the same thing.

Fire Alarm Systems are electronic systems which are designed to warn and alert people in the case of a fire. These systems usually contain a central fire alarm control panel, a manual call point and smoke/heat detectors. The heat detectors and detect heat and set off the fire alarm and the smoke detectors detect the smoke from a fire to also set of the fire alarm system. The manual call points are pressed, smashed by someone in order to set off the fire alarms to warn occupants that there is a fire.

Heat detectors and usually used in kitchens, bioler houses etc where a lot of smoke/stome is produced, thus stoppping false alarms.

Although, you can get seperate heat detection systems which nearly do the same job as fire alarm systems, just with heat detectors.