Honeywell T4 Series Thermostats User Guide

Honeywell T4 Series Thermostats

Product Information

The T4, T4R, and T4M Thermostat are programmable thermostats designed to control heating systems. The T4 model is a programmable thermostat, while the T4R model is a wireless programmable thermostat. The T4M model is a programmable modulating thermostat. These thermostats feature a user-friendly interface with various icons and menus for easy navigation and control. They also come with status icons to indicate different system statuses, such as schedule activation, low battery, heat demand, wireless signal strength (T4R only), and more.

Product Usage Instructions

Thermostat Interface:

The thermostat interface consists of various elements:

• Setpoint periods: Represents the different time periods with specific temperature settings.
• Days of week: Indicates the current day of the week.
• Current time / Timer: Displays the current time or acts as a timer during certain operations.
• Menu items: Accesses different menus and settings.
• Alert / Fault: Displays any system alerts or faults.
• Room temperature: Shows the current temperature in the room.
• Setpoint temperature: Indicates the desired temperature for heating.
• Heat demand: Indicates a demand for heating when the room temperature is below the setpoint.
• Low battery: Indicates low battery power, flashing when critically low.
• Wireless Signal (T4R only): Shows the wireless signal strength between the thermostat and the Receiver Box.
• Schedule status: Indicates whether the programmed schedule is active or turned off.
• Temperature adjustment / Menu navigation: Allows adjusting temperature settings and navigating through menus.
• Timed override: Sets a timed duration for overriding the current settings.
• Standby mode: Turns the heating on or off.
• Home screen: Returns to the main screen.
• Back: Returns to the previous screen/menu.
• Confirm: Confirms a change or selection.
• Cancel: Rejects a change without saving.

Navigating the Menu:

To navigate through the menu, use the following buttons:

• Press: To save changes or advance to the next selection.
• Press: To go back to the previous selection.
• Press: To save changes and return to the home screen.

Adjusting the Heating Schedule:

To adjust the programmed schedule, follow these steps:

1. Press [Menu] to enter the main menu.
2. Use [Up] or [Down] to select the schedule menu and press [Confirm].
3. Use [Up] or [Down] to select EDIT and press [Confirm].
4. Use [Up] or [Down] to select the day to be adjusted and press [Confirm].
5. Use [Up] or [Down] to select the period to be adjusted and press [Confirm].
6. Use [Up] or [Down] to adjust the start time and press [Confirm].
7. Use [Up] or [Down] to adjust the end time and press [Confirm].
8. Use [Up] or [Down] to adjust the temperature and press [Confirm].
9. Repeat these steps to make adjustments to the remaining periods and days, or press [Save] to save changes and return to the home screen.

Adjusting the Clock:

To make adjustments to the clock format or time, follow these steps:

1. Press [Menu] to enter the main menu.
2. Use [Up] or [Down] to select the Clock menu and press [Confirm].
3. Use [Up] or [Down] to change the clock format and press [Confirm].
4. Use [Up] or [Down] to adjust the time and press [Confirm].

Thermostat Interface

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.

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.

Menu

Heating schedule

Your Thermostat comes with the following default schedule. Follow the next steps to adjust the programmed schedule.

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
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.

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

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

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.

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.

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.

Standby mode (with frost protect)

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

Away mode
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.

Schedule Override

During normal use your Thermostat will follow the programmed schedule – indicated by the icon. There are a few ways you can override the schedule to suit your current needs.

Temporary Override

Set until next programmed setpoint is reached.

1. Press or to set the new desired temperature. The programmed schedule will resume at the next programmed setpoint.

2 H Timed Override (1 or 2 hours)

Can be used to Boost (increase) the heating for a short period or as an Economy (decreased) setting if leaving the house for a short period.

1. Press or to set the new desired temperature and press to activate the timer.
2. Press or to select 1 or 2 Hours and press
3. To cancel the timed override press again from the home screen.

Turn Schedule Off (Manual Mode)

Turn the heating schedule off and permanently follow a single (adjustable) temperature – until the schedule is turned on again.

1. Press or to select the schedule menu and press
2. Press or to select OFF and press
3. Press or to adjust the permanent temperature.
4. Repeat above steps and choose ON to follow the schedule.

Changing the Batteries (T4 & T4R only)

The Thermostat is powered by batteries, although a battery icon is not shown on the display during normal use. The only time you will see the battery icon is when they get low on power.

• is displayed when battery power has reached approximately 10% – you should be prepared to change them soon.
• + will flash when battery power has become critically low – you should change them immediately to make sure there is no disruption to your heating system.
• Replace with 2 new 1.5V LR6 AA Alkaline batteries only – which should last approximately 2 years depending on Thermostat use.

1. Pull Thermostat off the wall bracket or table stand.
2. Remove old batteries and insert new ones.
3. Clip Thermostat onto wall bracket or table stand.

Wireless Receiver Box (T4R only)

The T4R Thermostat communicates wirelessly to the Receiver Box which is wired to the boiler. If the Thermostat loses wireless communication or becomes faulty, the boiler can be switched on or off manually using the button on the Receiver Box

• is displayed on the Thermostat when the wireless signal is good – The receiver box LED will be solid GREEN.
• + will flash on the Thermostat when the wireless signal is lost – The Receiver Box LED will flash RED.
• If communication is lost move the Thermostat to another location to try and restore communication.

To manually override the boiler using the Receiver Box:

1. Press the button once to switch the boiler ON or OFF. The button LED should be:
   • Solid YELLOW when the boiler is ON.
   • Off when the boiler is OFF.

Troubleshooting

If you have difficulty with your Thermostat, try these suggestions. Most problems can be corrected quickly and easily.

All models

Screen is blank| Replace the batteries (T4 & T4R only).

Check the OpenTherm boiler has power (T4M only). Contact installer.

Thermostat shows| Batteries have less than 10% power and need to be replaced soon.
Thermostat is flashing +| Batteries are critically low and need to be replaced immediately – see ‘Changing the Batteries’.
Thermostat shows  but the boiler does not switch on.| The boiler cycles on and off as it controls the temperature, and sometimes the icon will be displayed when the boiler has cycled off.

If the boiler doesn’t switch on after a long period of time contact your installer

Heating system does not respond to temperature adjustments.| Make sure the set temperature is higher than the actual room temperature.

Check the heating system is powered on.

Check the Receiver Box is powered and the Thermostat has a wireless signal (T4R only).

Thermostat shows

| The temperature sensor of your Thermostat is faulty, contact your installer to repair

or replace the Thermostat.

T4R (Wireless) Thermostat & Receiver Box only

Thermostat is flashing  + and Receiver Box  LED is flashing RED.| Wireless signal lost – Move the Thermostat to another location to try and restore communication.
Thermostat is flashing  +  and Receiver Box  LED is off.| Check Receiver Box has power by pressing the button to switch boiler on.

If Receiver Box has power then no wireless binding data stored – Follow binding procedure in the installation guide or contact your installer.

Receiver Box  LED is flashing ORANGE.| Receiver Box is in binding mode – will time out of this mode after 3 minutes.
T4M (OpenTherm) Thermostat only

An OpenTherm boiler can report alerts back to the Thermostat which can be useful when contacting an installer or maintenance engineer. You can view these in the ‘OpenTherm® boiler alerts’ menu.
Description| ID| Error code| OT Reading
Service request| 001| 01SR| 0 = service not required 1 = service required
Low water pressure| 002| 02WP| 0 = no WP fault 1 = WP fault
Gas/flame fault| 003| 03GF| 0 = no GF fault 1 = GS fault
Air pressure fault| 004| 04AF| 0 = no AP fault 1 = AP fault
Water Over Temperature| 005| 05WT| 0 = no OVT fault 1 = OVT fault
OEM specific| 006| 06OS| Boiler manufacturer specific code

T4
Programmable Thermostat
T4R
Wireless Programmable Thermostat
T4M
Programmable Modulating Thermostat

Institut
Automatització, S.L.
c\ Gomis, 29-33, 08023 BARCELONA
Tel.: 93 454 20 06
Fax: 93 323 70 59
iac@instauto.com
www.instauto.com

© 2016 Honeywell International Inc. Printed in the UK
32318059-001 B

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