Carrier HH18HA187 Limit Switch using 18 AWG wire is

using 18 AWG wire is recommended for runs exceeding 150 feet to keep error below 1°F

By capturing particulates and neutralizing harmful acids

allowing it to withstand ambient temperatures up to 122°F while maintaining consistent magnetic flux

Environmental Resilience: Water and dust-resistant construction makes it suitable for marine and outdoor industrial use

Carrier HH18HA187 Limit Switch using 18 AWG wire isThe Carrier HH18HA187 Limit Switch is a critical OEM replacement part designed for high limit safety monitoring in residential and commercial gas furnaces. This SPST normally closed disc style switch features a fixed 180 degree open setpoint and a 80 degree close reset point, ensuring the heat exchanger does not exceed safe operating temperatures. Engineered for automatic reset functionality, the HH18HA187 integrates seamlessly into the safety string