Tag: RTH7400D Thermostat

Honeywell Home RTH7400D Programmable Thermostat The RTH7400D Thermostat provides electronic control of 24 Vac heating and cooling systems or 750 mV heating systems. For assistance with your Honeywell product, please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll-free at 1-800-468-1502. Installation Step 1. Prepare for Installation Check that the following items are included: If any of…