Honeywell T8400C Installation Instructions - Page 5

3. Press the s key. Factory information is displayed. A typical example is shown, but information displayed varies by model. This information is for factory use only. T8400C AND T8401C ELECTRONIC THERMOSTATS 10. Press the s key to save all changes, exit installer setup mode and return to normal operation. NOTE: After exiting installer setup mode, change the setpoint to the desired room temperature. M14687 4. Press the s key again to display °C or °F. M14688 5. Press the t key to change the °C or °F indication. M14689 6. Press the s key to display the heat cycle rate of 1, 3, 4, 5, 6, 9, or 12. If the desired cycle is displayed, press the s key to exit the installer setup mode. To change the heat cycle rate, press the t key to scroll between 1, 3, 4, 5, 6, or 9. Stop scrolling when the desired rate is displayed. See Table 1 for the cycle rate options and the corresponding system equipment. M14690 Table 1. Heating Cycle Rates. System Steam, radiant floor heat, gravity Hydronic heat, condensing gas furnacea Gas or oil forced air Electric heat Special applicationsb Cycles Per Hour 1 3 6 9 4, 5, 12 aHigh efficiency furnace. bRefer to equipment manufacturer's instructions. NOTE: Steps 7 and 8 are available on select models. 7. Press the s key to display cooling algorithm configuration default. M18419A 8. Press the s key again to change cooling algorithm to C1 or C3. C1 = Standard cooling algorithm. C3 = Aggressive cooling algorithm (can cause overshooting). 9. Press the s key again. Current configuration (CC) is displayed. A typical example is shown, but CC varies by model. (This information is for factory use only.) CHECKOUT Heating 1. Slide the SYSTEM switch to Heat and the FAN switch to Auto, if available. 2. Press and hold the s key to raise the temperature setting several degrees above the room temperature. After approximately ten seconds, the heating equipment should start. In conventional systems, the system turns on the fan through the use of a time delay relay or through a limit control. When using an electric heat thermostat, the fan starts immediately. 3. Press the t key to lower the temperature setting below the room temperature. Heating equipment should stop. Cooling CAUTION Low Temperature Hazard. Operating at too low of an outdoor temperature may cause compressor damage. Do not operate cooling if outdoor temperature is below 50°F (10°C). Refer to manufacturer's recommendations. 1. Slide the SYSTEM switch to Cool and the FAN switch to Auto. 2. Press the t key to lower the temperature setting several degrees below the room temperature. After approximately five minutes, the cooling equipment should start. The fan starts and stops with the cooling equipment. 3. Press the s key to raise the temperature setting above the room temperature. Cooling system should shut down. NOTE: To bypass the 5 minute delay, see the Optional System Checkout section. Fan 1. Slide the SYSTEM switch to Off and the FAN switch to On. The fan should run continuously. 2. Slide the FAN switch to Auto. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (on most systems). When using an electric heat thermostat, the fan starts and stops with the heating equipment. In cooling, the fan starts and stops with the cooling equipment. Make certain all equipment responds properly to the thermostat. M18420 5 69-1480-1