Description
The Resideo 191990A Replacement Keys 2 TG509 TG510 TG511 TG512 are mechanical safety control keys to HVAC systems that are used to operate or reoperate safety interlocks of compatible control modules. Each key can be inserted in a slot specified on control interfaces and also enables authorized service to be able to finish the start-up sequences or relocate to operation following a safety trip. The keys are a secure means of accessing and operating safety circuits. They assist in the regulation of adequate heating and ventilation.
