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

Its compact profile and union connections simplify installation and field service

significantly reducing downtime during troubleshooting

Precise Pressure Regulation: Integrated pressure taps allow technicians to verify inch water column (WC) settings during installation

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

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