This document is the installation manual for the RTH7500D thermostat. This thermostat can control 24 Vac heating and cooling systems or 750 mV heating systems.
This Owner’s Guide walks you through preparing for installation, including checking that all required parts and tools are present, such as the wallplate, thermostat, mounting screws, and two AA alkaline batteries. It then explains how to safely remove the old thermostat, label wires, and connect the new unit, with special instructions for C and C1 wires.
The manual also includes important safety notices, a one‑year limited warranty, and contact information for Honeywell customer support.
| Power supply compatibility | 24 Vac heating and cooling systems or 750 mV heating systems |
|---|---|
| Battery type | Two AA alkaline batteries |
| Warranty period | One year |
Verify that the wallplate, thermostat, mounting screws, wall anchors, wire labels, caution card, and two AA alkaline batteries are included.
Honeywell provides a limited one‑year warranty from the date of purchase.