Honeywell TH5110D Non-programmable Thermostat Manual
The TH5110D Thermostat provides electronic control of 24 Vac singlestage heating and cooling systems or 750 mV heating systems.
Honeywell TH5110D Features
- Large, Clear, Backlit Display: Easy-to-see and readeven in the dark.
- Precise Comfort Control: ±1ºF of your set temperature.
- Simplified Operation: Soft-key controls.
- Simultaneously displays both room temperature and temperature setting.
- Easy Change Battery Holder.
- Built-in Compressor Protection: Minimum-off timer protects compressor from restarting too early after a shutdown.
Honeywell TH5110D Set System Setting
Press the System button to select Heat, Off, Cool or Auto:
- Heat - Thermostat controls the heating system.
- Off - Both the heating and cooling systems are off.
- Cool - Thermostat controls the cooling system.
- Auto - Thermostat automatically changes between heating and cooling operation, depending on indoor temperature. See Auto Changeover section.
Honeywell TH5110D Set Fan Setting
Press the Fan button to select Auto or On:
- Auto - Normal setting for most homes. The fan runs only when the heating or cooling system is on.
- On - The fan runs continuously. Use this setting for improved air circulation or for more efficient air cleaning.
Honeywell TH5110D Change Temperature Setting
Press the Up or Down button to select the desired temperature setting.
The first press of the Up or Down button turns on the backlight. The second press of the Up or Down button changes the temperature setting.
Honeywell TH5110D Replace Battery Tips
- When the Replace Battery indicator is flashing, replace batteries promptly with two fresh AAA alkaline batteries.
- Press the battery holder latch to release the battery holder.
- Remove the battery holder from the thermostat.
- Remove the old batteries and insert two fresh AAA alkaline batteries as marked on the battery holder.
- Insert battery holder as shown.
Honeywell TH5110D Review Battery Tips
- Replace the batteries as soon as Replace Battery flashes in the display. The Replace Battery indicator flashes in the display two months before the batteries run down completely.
- Always use fresh AAA alkaline batteries. Nonalkaline batteries do not last as long and can leak, causing damage to the thermostat.
- Although the thermostat has a Replace Battery indicator, replace the batteries once per year to prevent the thermostat and heating/cooling system from shutting down due to a lack of battery power. NOTE: Replacing the batteries once a year also helps prevent battery leakage that can damage the thermostat.
- As a precaution, replace the batteries when leaving your home for more than a month to prevent your heating/cooling system from shutting down if the batteries run down completely.
Honeywell TH5110D Built-in Compressor Protection
The TH5110D Thermostat has built-in compressor protection (minimum-off timer) that prevents the compressor from restarting too early after a shutdown. The minimum-off timer is activated after the compressor turns off.
If there is a call during the minimum-off timer, the thermostat flashes Cool On or Heat On a in the display. When the minimum-off timer expires, Cool On or Heat Ona appears solidly in the display and the compressor and the fan turn on.
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