Carrier HH22AL090 Industrial HVAC Control Relay Module

Carrier HH22AL090 is a two‑stage remote‑bulb temperature switch (thermostat) used in select Carrier HVAC equipment to drive staged cooling or heating based on the temperature at the remote bulb. Marketed as a genuine Carrier OEM replacement part for air conditioners, packaged units/RTUs, and central systems, it is commonly listed as a 2‑stage remote bulb thermostat under the HH22AL090 model by multiple retailers. Retailers describe it as the HH22AL090 Thermostat or 2‑Stage Remote Bulb Temperature Switch, underscoring its role as a spare part for Carrier systems that require remote temperature sensing to control multiple stages. This part is widely stocked across service catalogs such as Repair Clinic, SupplyHouse, Parts Town, Sears Parts Direct, and Radwell, reflecting its status as a standard replacement component for compatible Carrier equipment.