Honeywell TH5110D Manual

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.

Features

• •Large, Clear, Backlit Display: Easy-to-see and read—even 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.

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.

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.

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.

Replace Battery Tips

1. When the Replace Battery indicator is flashing, replace batteries promptly with two fresh AAA alkaline batteries.
2. Press the battery holder latch to release the battery holder.
3. Remove the battery holder from the thermostat.
4. Remove the old batteries and insert two fresh AAA alkaline batteries as marked on the battery holder.
5. Insert battery holder as shown.

Review Battery Tips

1. 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.
2. Always use fresh AAA alkaline batteries. Nonalkaline batteries do not last as long and can leak, causing damage to the thermostat.
3. 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.
4. 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.

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 On  a appears solidly in the display and the compressor and the fan turn on.

Auto Changeover

Auto Changeover is a feature used in climates where both air conditioning and heating are used on the same day. The Auto setting appears only if the thermostat is set up for Auto Changeover by your heating and air conditioning dealer. In some installations, Auto may be the only system selection. The following pages in this Auto Changeover section provide an example of how to change both the cool and heat temperature settings when the system is set to Auto. When you are adjusting the temperature setting, if "UP-Cool" or "DOWN-Heat" appear in the display, the temperature setting of the opposite mode is also being adjusted. The thermostat automatically keeps the cool and heat temperature settings three degrees apart (called deadband). This three-degree deadband is not adjustable.

1. Auto Changeover (Cont) The Auto setting appears only if the thermostat is set up for Auto Changeover by your heating and air conditioning dealer.
2. Press the Up or Down button to raise or lower the cool temperature setting.
3. Press the Select Heat/Cool button to display the Heat temperature setting. Select Heat/Cool flashes for six seconds.
4. Press the Up or Down button to raise or lower the heat temperature setting.
5. Select Heat/Cool stops flashing six seconds after the last button press. The thermostat then returns to displaying Auto for the System setting.

Replacement Part

Replacement Battery Holderó Part number 50000951-001 Battery Holder.

Troubleshooting

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