Tag: Honeywell RTH2520

Honeywell RTH2520 Programmable Thermostat Introduction The RTH2520 programmable thermostat can be used to control: a gas, fuel oil, or electric furnace -2 or 3 wires a central air conditioner – 2 or 3 wires a hot water system with or without pump – 2 wires a millivolt system – 2 wires a central heating and…