the "C" suffix typically denotes retail or specific packaging but does not change the HVAC thermostat functionality

While compatible with the refrigerants used in heat pumps

High-capacity air discharge facilitates faster steam system heat-up times

This specific control board is designed for systems utilizing standard multi-speed PSC blower motors typical of the HK42FZ application range

significantly reducing downtime during troubleshooting

Lochinvar & A.O. Smith 100110039 Thermostat 320074-702 the "C" suffix typically denotesThe Lochinvar & A. O. Smith 100110039 Thermostat is a technician grade component designed for precise temperature regulation in commercial and residential electric water heaters. This lower thermostat assembly features a single pole, wire in configuration with a 2 screw terminal design, ensuring a secure electrical connection to the heating element. It operates within a standard 90F to 150F temperature range, allowing for accurate set point