Honeywell LYRIC T4 User manual

User Guide
T4, T4R & T4M Thermostat
T4
Programmable Thermostat
T4M
Programmable Modulating
Thermostat
T4R
Wireless
Programmable
Thermostat
EN

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Contents
Thermostat Interface.....................................................................................4
Status Icons.........................................................................................4
Menu & Navigation Icons.............................................................5
Navigating the menu......................................................................5
Menu................................................................................................................6
Heating Schedule .......................................................................6
Clock ..................................................................................................8
Date ....................................................................................................8
Keypad lock ....................................................................................8
Optimisation..................................................................................9
OpenTherm® boiler alerts (T4M only)............................10
Standby mode..........................................................................................10
Away mode.................................................................................................10
Schedule Override........................................................................................ 11
Temporary Override............................................................. 11
Timed Override ...................................................................... 11
Turn Schedule Off.....................................................................11
Changing the Batteries (T4 & T4R only) ..........................................12
Wireless Receiver Box (T4R only)......................................................... 13
Troubleshooting............................................................................................ 14

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Thermostat Interface
Room
temperature
Setpoint
temperature
Days of week
Current time /
Timer
Menu items
Alert / Fault
Setpoint
periods
Low
battery
Heat
demand
Schedule
status
Temperature
adjustment /
Menu navigation
Menu
Confirm
Cancel
Back
Away mode
Timed override
Standby mode
Home screen
Status Icons
Schedule On: Programmed schedule is active.
Schedule Override: Active until next scheduled period
starts or the timed override duration has ended.
Schedule Off: Programmed schedule is turned off.
Low Battery: Power has reached approximately 10% - flashes
when critically low (see Changing the Batteries).
Heat Demand: Room temperature is below setpoint - indicating
there is a demand for heating (boiler activity might occur).
Wireless Signal: Thermostat (T4R only) is connected to the Receiver Box.
Wireless Signal
(T4R only)

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Menu & Navigation Icons
Menu: Options and settings of your Thermostat:
- Heating schedule
- Clock
- Date
- Keypad lock
- Optimisation
- OpenTherm® boiler alerts (T4M only)
Back: Return to the previous screen/menu.
Confirm: Confirm a change or selection.
Cancel: Reject a change without saving.
Timed override: Set a timed duration for the override.
Standby: Turns the heating on or off.
Away mode: Turns the heating off for a set number of days.
Home: Returns you directly back to the home screen.
Navigating the menu
• Press button to enter the main menu.
• Press or buttons to select a menu item - the selected item will flash.
• Press to confirm the selection.
• Press or to adjust a setting and
- press to save change or advance to next selection.
- press to go back to previous selection.
- press to save change and return to home screen.

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Heating schedule
Your Thermostat comes with the following default schedule.
Follow the next steps to adjust the programmed schedule.
Days 1 to 5 (Mon to Fri) Days 6 & 7 (Sat & Sun)
Period Time °C Time °C
P1 6:30 - 8:00 19 °C 8:00 - 10:00 19 °C
P2 8:00 - 18:00 16 °C 10:00 - 17:00 16 °C
P3 18:00 - 22:30 21 °C 17:00 - 23:00 21 °C
P4 22:30 - 6:30 16 °C 23:00 - 8:00 16 °C
1. Press to enter the main menu. 2. Press or to select the schedule
menu and press
3. Press or to select EDIT and press
Menu

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4. Press or to select the day to
be adjusted and press
5. Press or to select the period
to be adjusted and press
6. Press or to adjust the
start time and press
7. Press or to adjust the
end time and press
8. Press or to adjust the
temperature and press
9. Repeat these steps to make adjustments
to the remaining periods and days
- or press to save changes and
return to the home screen.

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Menu
Clock
To make adjustments to the clock format or time.
1. Press to enter the main menu.
2. Press or to select the Clock menu and press
3. Press or to change the clock format and press
4. Press or to adjust the time and press
Keypad lock
You can lock the keypad to prevent unnecessary adjustments to the Thermostat.
1. Press to enter the main menu.
2. Press or to select the Keypad lock
and press to activate it.
3. To unlock the Keypad press and hold
the Left and Right buttons for 5 sec.
4. To lock the Keypad repeat step 2.
Date
To make adjustments to the date - Year/Month/Day.
1. Press to enter the main menu.
2. Press or to select the Date menu and press
3. Press or to adjust year and press
4. Press or to adjust month and press
5. Press or to adjust day and press
5 sec

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Menu
Optimisation
Your Thermostat has optimisation functions that aim to save
energy while maintaining suitable comfort levels. The Thermostat
displays during the optimisation period if set.
• Optimum Start learns how long it takes your home to reach a
set temperature and then turns the heating on a bit earlier to
achieve that temperature at the programmed time.
• Delayed Start saves energy by slightly delaying the start of heating depending
on the difference between the set temperature and the room temperature.
The closer these temperatures are the longer it will delay the start.
• Optimum Stop saves energy by switching off a little bit earlier than the
programmed time. If your home is up to temperature, you will not notice the
effect on the temperature, but you should see a difference in your fuel bill.
To enable or disable an optimisation function:
1. Press to enter the main menu.
2. Press or to select the Optimisation menu and press
3. Press or to select an option and press
-0:8P for Optimum Start or Delayed Start
-0:9S for Optimum Stop
4. Press or to change the optimisation function and press
-0:8P 0= Optimum Start disabled
-0:8P 1= Optimum Start enabled
-0:8P 2= Delayed Start enabled
-0:9S 0= Optimum Stop disabled
-0:9S 1= Optimum Stop enabled
5. Press to save changes and return to the home screen.

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Save energy by switching the heating off for a set period of time while
you are away from home - and back on again in time for your return.
1. Press to enter the away mode menu.
2. Press or to select the number of days you will be away and press
3. Press or to set the temperature while you are away and press
4. To cancel Away mode press again from the home screen.
Save energy by switching the heating off when not required - e.g.
during warmer summer months, or when doors and windows are
open for extended periods of time. If the temperature drops to 5°C
the heating will come on to prevent the heating pipes freezing.
1. Press to switch the heating off - the display will show OFF.
2. Press a gain to switch the heating on - the display will show .
OpenTherm® boiler alerts (T4M only)
If you have T4M Thermostat fitted to an OpenTherm® boiler, you can view alerts
received form the boiler about your heating system.
1. Press to enter the main menu.
2. Press or to select the OpenTherm alerts menu and press
3. Press or to cycle through the list of boiler alerts.
4. Press to return to the home screen.
Menu
Standby mode (with frost protect)
Away mode