How to Wire Honeywell RTH7500 Thermostats
- 1). Turn off the electricity to your equipment (such as a boiler, furnace or air-conditioner) at your electric service panel.
- 2). Refer to your equipment's installation instructions for the correct low-voltage thermostat wiring requirements and terminals. Each piece of equipment may have different thermostat requirements and wiring diagrams.
- 3). Match equipment letter terminals to corresponding Honeywell RTH7500 letter terminals. Do not rely on wire colors. Typically, "Y" on a conventional forced-air furnace with air conditioning corresponds to a Y on the thermostat but is connected by the blue wire, not the yellow wire.
- 4). Label each thermostat wire at the thermostat location with the appropriate terminal letter designation using the labels provided with the Honeywell RTH7500. The following represents a typical forced-air heating and air conditioning system: The red thermostat wire connects to the "R" terminal on the RTH7500; the white wire connects to the "W" terminal; the green wire connects to the "G" terminal; and the blue wire connects to the "Y" terminal. Refer to your equipment's installation instructions, as your system may differ.
- 5). Strip 1/4 inch of insulation from each wire using the wire strippers.
- 6). Match each labeled wire to the same letter on the Honeywell RTH7500 thermostat.
- 7). Connect the wires one at a time by loosening the thermostat screw terminal, inserting the wire and tightening the screw. Ensure a tight connection with a slight tug.
