PLEASE RESPECT YOUR ENVIRONMENT!

Take care to dispose of this product and any packaging or literature in an appropriate way

WHAT IS A PROGRAMMER?

...an Explanation for Householders (as recommended by the Energy Savings Trust)

Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central heating and domestic hot water on and off at the same time, while others allow the domestic hot water and heating to come on and go off at different times. Set the ‘On’ and ‘Off’ time periods to suit your own lifestyle. On some programmers you must also set whether you want the heating and hot water to run continuously, run under the chosen ‘On’ and ‘Off’ heating periods, or be permanently off. The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean

Time and British Summer Time. You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’, or ‘Boost’. These are explained in the manufacturer’s instructions. The heating will not work if the room thermostat has switched the heating off. And, if you have a hotwater cylinder, the water heating will not work if the cylinder thermostat detects that the hot water has reached the correct temperature.

WHAT IS A ROOM THERMOSTAT?

...an explanation for Householders (as recommended by the Energy Savings Trust)

A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. Turning a room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators. Neither does the setting affect how quickly the room cools down. Turning a room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy. The heating system will not work if a time switch or programmer has switched it off. The way to set and use your room thermostat is to find the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18ºC – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

Room thermostats need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may prevent the thermostat from working properly.

Honeywell Control Systems Ltd.

Arlington Business Park,

Bracknell

Berkshire

RG12 1EB

Technical Help Desk: 08457 678999 www.honeywelluk.com

50047645-005 A

© 2011 Honeywell International Inc.

User Guide

Y9120H Sundial RF

2

Pack 1

How to use:

ST9120C Wireless Enabled Timer

DT92E Wireless Room Thermostat

BDR91T Wireless Enabled Relay Box (if installed)

This document is to be left with the user and forms part of a Home Information Pack

System Components

This section is to be completed by the Installer

Location

ST9120C

DT92E

(typically in living room or hallway)

BDR91T

(If installed, typically next to boiler)

Energy Efficiency and the Environment

Home energy use is responsible for more than ¼ of the total UK carbon emissions which contribute to climate change. Heating and hot water systems based on boilers account for of this figure, so it is important to understand how your controls can help to maximize energy efficiency while maintaining your comfort.

Your Timer should be used in conjunction with appropriate temperature controls. In order to save energy the following general points should be observed:

1. Ensure your system contains a room thermostat (where appropriate), and that it is set to an appropriate temperature level, typically 20°C

2. Programme your heating (and hot water) to be off when you are not in the house. If you are concerned about possible frost damage to any exposed pipe work, it is advisable to fit a frost protection system – your installer can advise you about this.

3. Think about how you use your domestic hot water – if you have a storage system, it is not necessary to have this switched on all the time, even when you are in the house.

4. Consider the heat up times required for your central heating. Every home responds differently when the heating is switched on. Adjust the start time so that you are not cold when you get up in the morning. A shorter heat up time is required for other heating periods.

5. In the evening, when the house is up to temperature, it is often possible to switch off the heating up to an hour before you go to bed, without any noticeable reduction in comfort.

ST9120C CONTROLS LAYOUT

1 2 3 4 5 6 7

EXTRA HOUR

OVERRIDE

18

17

16

NEXT

DAY

COPY

DAY

HOLIDAY

ST9120C

OK

NEXT

DAY/TIME

PROGRAMME

RUN

6

7

4

5

8

9

1

2

3

Time Display

LoT™ Technology Display

Programme Time Markers

Day of Week Indicator

RF Symbol

‘ON’ period indicator

Extra Hour Button

Indicator Lamp

Override Button

15 14 13 12

13

14

15

16

10

11

12

17

18

Boiler Status Indicator

Slider

Operating Mode Indicator

Operating Mode Button

OK/Next Button

Clock – and + Buttons

Holiday Button

Copy Day Button

Next Day Button

8

9

10

11

DT92E CONTROLS LAYOUT

1 2 3 4

13

12

11

10

7

8

9

5

6

5

6

7

3

4

1

2

ECO Mode Active

Frost Protect Indicator

ECO Countdown Indicator

Heating Demand Indicator

Setpoint Change Buttons

ECO Button

OFF/Standby Button

BDR91T CONTROLS LAYOUT

10

11

8

9

12

13

OFF/Standby Indicator

RF Communications Indicator

Battery Low Indicator

Fault Indicator

Setpoint Indicator

Temperature Display

Green light, relay status indicator

Push button

Red light, indicator for special modes or loss of communications

Keep this document in a Home Information Pack

CONFIGURATION & SERVICE DATA

Configurable Features Options

DT92E Configuration

Measurement offset

Upper setpoint limit

Lower setpoint limit

-3.0°C to 0 to 3.0°C

21 to 35°C

5 to 21°C

Energy saving ECO setpoint 5 to 35°C

Factory setting

Installer configured

(note value)

0

35°C

5°C

18°C

Boiler & System Service Log

The space below can be used to provide a record of boiler & system services and the names and contact numbers of the Installer and Service Personnel.

This information is important for a Home Information Pack.

Service/Installation

Date

Installation/Service

Engineer

Telephone Number /

Contact Details

This product and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc. and its subsidiaries and existing under the laws of the UK and other countries. These intellectual and property rights may include patent applications, registered designs, unregistered designs, registered trade marks, unregistered trade marks and copyrights.

Honeywell reserves the right to modify this document, product and functionality without notice. This document replaces any previously issued instructions and is only applicable to the product(s) described.

This product has been designed for applications as described within this document. For use outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be held responsible for misapplication of the product(s) described within this document.

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell

Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised

Representative Honeywell Inc.

31

Contents

CONTROL OF YOUR SYSTEM

General Description of Controls in Your System ...............................................4

The way to use a Timer .....................................................................................4

The way to use a Room Thermostat .................................................................5

Control of Your Boiler ........................................................................................5

Optimisation ......................................................................................................5

GETTING STARTED WITH YOUR ST9120C

Step 1: Setting the Date & Time .......................................................................6

Step 2: Running a Built-in Programme .............................................................7

PROGRAMMING YOUR ST9120C

The Built-in Programmes / Your Personal Programme......................................8

Reviewing the Programme Times .....................................................................9

Modifying the Programme ................................................................................9

Disabling / Enabling Time Periods .................................................................11

OPERATING YOUR ST9120C

Choosing the Operating Mode .......................................................................12

Overriding the Operation Without Changing the Programmes.......................12

The Extra Hour Function .................................................................................13

The Holiday Function ......................................................................................13

Enquiry Mode .................................................................................................14

FINE TUNING YOUR ST9120C

Changing from AM/PM Time Display to the 24 Hour Clock............................15

Changing the Installer Parameters .................................................................15

Optimisation ....................................................................................................17

BOILER SERVICE REMINDER

Countdown to Service / When Service is Due ................................................18

Shut-down .......................................................................................................19

OPERATING YOUR DT92E

Inquiring about the Set Temperature / Adjusting the Set Temperature ...........19

Switching Off / Display Updates / Heating Indicator / Frost Protection ..........20

DT92E OPERATING INDICATORS

Low Battery Indicator / Battery Replacement .................................................21

RF Communications Indicator / Lockout ........................................................21

DT92E ENERGY SAVING ECO FEATURE

Entering ECO Mode and Setting the Energy Saving Time Period ..................22

What Happens in ECO Mode? .......................................................................22

How to Exit ECO Mode ...................................................................................23

FINE TUNING YOUR DT92E

Changing the DT92E Installer Parameters .....................................................23

OPERATING YOUR BDR91T RELAY BOX (IF INSTALLED)

Automatic Operation / Temporary Manual Override .......................................25

Loss of Wireless Communications ..................................................................25

FAQ AND TROUBLESHOOTING

Frequently Asked Questions ..........................................................................26

Troubleshooting Guide ...................................................................................28

CONFIGURATION & SERVICE DATA (to be completed by Installer)

.................30

3

CONTROL OF YOUR SYSTEM

General Description of Controls in Your System

Your Honeywell ST9120C provides timing control for your central heating system, letting you set ON and OFF periods to suit your own lifestyle.

The ST9120C does not directly control the temperature but works together with other temperature controls, such as room thermostats, to control your heating system in your home.

With 7-day programming and up to 3 on/off periods per day, every day can be set differently.

ST9120C also has a Boiler Service reminder / Shut-down feature, which helps ensure your gas boiler is regularly serviced in compliance with UK Gas Safety

Regulations. For more details see pages 18 & 19.

Your system includes a DT92E wireless room thermostat and may include a BDR91T

Relay Box to switch your boiler remotely. These products use state of the art 2 way

RF communications to share information and give you robust and flexible control of your indoor environment.

The following instructions explain how to programme and use the ST9120C, and associated controls, to provide the most home comfort at the least cost.

The way to use a Timer

Think about the time periods when you are typically in the house and when you are not.

These are the times you should use as the basis for the programmes. It will be necessary to allow some heat up time for the heating system after periods when it has been off – this would typically be 1 - 1½ hours, depending on your house and your preferences.

If Optimum Start has been selected (see page 17), you do not have to allow for this heat up time as the timer is intelligent and will calculate the correct starting time for your house. This is based on measurements it makes about your system characteristics, and on the current and target room temperatures. All you have to do is programme the time periods when you want to be comfortable.

Other features are commonly available on the Timer to enhance comfort and convenience, for example, OVERRIDE, EXTRA HOUR, and MODE buttons.

A typical use of the OVERRIDE feature is when you return home unexpectedly for the rest of the day and the heating is off. Just press the OVERRIDE button and the heating will come on until the next programme time, at which point it will follow the normal programme. The advantage here is that you do not have to remember to switch off because the normal time programme does this for you.

4

CONTROL OF YOUR SYSTEM

A typical use of the EXTRA HOUR button would be if you returned to the house for a short period when the heating was off. Pressing the EXTRA HOUR button gives you 1, 2, or 3 hours of heating, exactly when you need it. Another typical use is when the heating is already on and you want it to stay on a little longer - just press EXTRA

HOUR

and, for that day only, an hour will be added to the end of the time at which heating normally goes off.

The MODE button allows you to select how you want to operate your heating. The most obvious use is to switch heating OFF during the summer months, but you may also use this feature if you take a mid-week day off work, you can then set the MODE to ONCE to keep the system ON during the day from the first programmed ON time till the last programmed OFF time.

The way to use a Room Thermostat

The way to set and use your room thermostat is to find the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18°C – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

DT92E has a green ECO button, which enables you to set a period of time at a lower temperature. This energy saving feature is most useful if you are out of the house for a few hours, or if you want a reduced temperature for a while and don’t want to have to remember to turn the temperature back up (see pages 22 & 23 for details).

Control of Your Boiler

There are two ways your boiler may be controlled. It may be switched directly using the ST9120C timer, or, if installed in a remote location, it may be switched using a

BDR91T relay box.

In each situation the operation of the boiler is determined automatically by the combination of inputs from the room thermostat and the timer, and in such a way as to maintain your comfort with minimal energy use. The timer will indicate the on/off status of the boiler by showing the flame symbol .

Optimisation (see page 17 for explanatory diagrams)

Your control system has some features called Optimisation, which aim to save energy while making you as comfortable as possible. These may or may not be enabled – check page 30 where your Installer should have indicated how these were set. Optimisation does not apply to your Hot Water, only to your Heating and will

only work if you have a DT92E in your system.

5

CONTROL OF YOUR SYSTEM

Optimum Start

works by measuring how quickly your system normally heats up, and using this to calculate the correct time to switch on to reach your comfort temperature, when you want it. So the times you set are when you want the heating to be at

the correct temperature, and the system adjusts the starting time to meet this.

Delayed Start

is an alternative to Optimum Start. It works by using your normal programmed start times, compares the actual temperature with the set temperature, and delays the start a little depending on how close these temperatures are to each other.

Optimum Stop

saves energy, and money, by switching off a little earlier than the normal programme time. If the house is up to temperature, you will not notice the effect on the temperature, but you will see a difference in your fuel bill.

The radiator symbol on ST9120C will flash to let you know whenever Optimisation is operating.

The other controls in your system should not require adjustment.

GETTING STARTED WITH YOUR ST9120C

Your ST9120C should have been set up to work correctly when it was installed.

However, the following will show you how you can modify your settings to meet your particular lifestyle.

To assist you with programming and everyday use your ST9120C will display text messages at every stage to help you get the most out of your central heating system.

The ST9120C uses LoT™ Technology to constantly update the display to give you feedback about what is required.

Step 1: Setting the Date & Time

Your ST9120C had the date and time set at the factory, and these are normally maintained by a backup battery in the event of power failures. If you wish to change the date or time, or if the LoT™ Display shows the message ‘SET DATE + TIME’ just follow the instructions below. Otherwise, go to Step 2.

a.

Move the slider to the DAY/TIME position. The message ‘SET DATE + TIME’ will show briefly on the screen, followed by ‘SET THE DAY’, and the day of the month will now be flashing to indicate it can be changed.

6

DAY/TIME

PROGRAMME

RUN

GETTING STARTED WITH YOUR ST9120C b.

To change the day of the month, press the or buttons until the correct day is shown. Each press of the button will change the date by one day. As soon as a change has been made, the message ‘IS DAY OK?’ will be displayed. Once the correct day is reached, press the green button to confirm, and move to the next step. If you do not need to make a change, just press the button immediately and this will move you to the next step.

c.

The month digits will now be flashing and ‘SET THE MONTH’ will be displayed. To change the month, press the or buttons until the correct month is shown.

The message ‘IS MONTH OK?’ will be displayed. Press the green button to confirm the month is correct and move to the next step.

d.

The year digits will now be flashing and ‘SET THE YEAR’ will be displayed. To change the year, press the or buttons until the correct year is shown. The message ‘IS YEAR OK?’ will be displayed. Press the green button to confirm the year is correct. If you have made a change and the date is a valid date, the message ‘DATE SAVED’ will show and you can move to the next step. If the date you set was not valid, for example 31 September, the message ‘INVALID’ will show and you will be returned to the start of the date setting operation.

e.

The time will now be flashing and the message ‘SET THE TIME’ will be displayed.

To change the time, press the or buttons until the correct time is shown.

Each press of the button will change the time by one minute. Holding the button down for more than a few seconds will change the time slowly at first, then quickly. The message ‘IS TIME OK?’ will be displayed. Press the green button to confirm the time is correct. If you have made a change, the message ‘TIME

SAVED’ will show, followed quickly by ‘DATE + TIME COMPLETE’.

f.

Move the slider to the RUN position to complete setting the date and time.

Note:

if the slider is moved at any time before the date and time have been set correctly, the message ‘DATE UNCHANGED’ will be displayed briefly, and your changes will not be saved.

Step 2: Running a Built-in Programme

With the date and time correct, your ST9120C Timer will now be operating to the built-in programmes. These have been designed to provide heating at typical times throughout the day, but if you want to customise the settings, please see the next section ‘PROGRAMMING YOUR ST9120C’ (page 8).

7

PROGRAMMING YOUR ST9120C

The Built-in Programmes

The built-in programmes give you a starting point that you can personalise to your own requirements. Your Installer should have selected one and ticked the box alongside it. If there is no tick, the product normally leaves the factory with Profile A installed, but it is a simple matter to select one of the other profiles (see Changing

the Installer Parameters

, page 15).

Built-in Programme (Profile A)

Monday to Friday

Saturday & Sunday

ON 1 OFF 1 ON 2 OFF 2

6:30am 8:30am 12:00pm 1:00pm

6:30am 9:30am 12:00pm 1:00pm

ON 3 OFF 3

4:30pm 10:30pm

4:30pm 11:00pm

Built-in Programme (Profile b)

Monday to Friday

Saturday & Sunday

ON 1 OFF 1 ON 2 OFF 2

6:30am 9:30am 12:00pm 1:00pm

6:30am 9:30am 12:00pm 1:00pm

ON 3 OFF 3

4:30pm 11:00pm

4:30pm 11:00pm

Built-in Programme (Profile C)

Monday to Friday

Saturday & Sunday

ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3

6:30am 7:30am 12:00pm 12:00pm 5:00pm 10:00pm

8:30am 9:30am 12:00pm 1:00pm 5:30pm 10:30pm

Your Personal Programme

The table below has been left blank for you to record your own personal programme.

ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

8

PROGRAMMING YOUR ST9120C

Reviewing the Programme Times

To review your programme, move the slider to the PROGRAMME position.

To review the programme times, press the button repeatedly. The appropriate

ON

and OFF markers will be displayed to show you which time is being reviewed.

Any of these times can be adjusted by using the or buttons, and then confirmed using the button. Remember to return the slider to the RUN position after reviewing is complete.

Modifying the Programme

The programme has three pairs of ON/OFF switching times per day. Each time can be set between 3.00 am and 2.50 am (on the next day) to allow you to programme to stay on past midnight, if required.

a.

Move the slider to the PROGRAMME position. ‘SET PROGRAMME’ will show briefly to verify this action.

DAY/TIME

PROGRAMME

RUN

b.

‘SET ON-TIME 1’ will then be displayed and the time setting for the first ON 1 time for MONDAY will now be flashing to indicate it can be changed. If you do not wish to change the time, press the green button and move to the next step. If you do wish to make a change, use the or buttons to change the first ON 1 time. Each press of the button will change the time by 10 minutes.

As soon as the time has been changed, the message ‘ON-TIME 1 OK?’ will be displayed. Press the green button to confirm the time is correct and move to the next step. ‘SAVED’ will be displayed for a moment to confirm that any change has been saved to memory.

9

PROGRAMMING YOUR ST9120C

Note:

When pressing the button the next ON or OFF marker may start to flash.

This indicates you have tried to set a time equal to one of the next programme times already in the memory. Similarly, when pressing the button the previous ON or

OFF

marker may start to flash. This indicates you have tried to set a time equal to one of the previous programme times. If this happens the ST9120C simply moves both times together as long as you continue to press the or buttons. Follow the procedure in ‘Reviewing the Programme Times’ (page 9) to check and adjust these times as necessary.

c.

‘SET OFF-TIME 1’ will be displayed and the first OFF 1 time will now be flashing. If you do not wish to change the time, press the green button and move to the next step. Otherwise, use the or buttons to change the time. Press the green

button to confirm the time is correct and move to the next step. ‘SAVED’ will be displayed for a moment to confirm that any change has been saved to memory.

d.

The remaining ON and OFF times (ON 2, OFF 2, ON 3, OFF 3) can be set by using the or buttons to change the time, then the green button to confirm the time is correct and move to the next step. If you do not wish to change the time, just press the green button to move directly to the next ON/

OFF

time without making any changes.

e.

After setting or reviewing the last off time, OFF 3, the message ‘COMPLETE’ will be displayed to indicate the times for Monday have been set.

You now have a choice of how to set the programme for the next day:

Copying One Day’s Programme to Another Day (example Monday to Tuesday): f.

Whilst the day is showing Monday, Press the COPY DAY button. The message

‘COPY MON TO TUESDAY OK?’ will be displayed and the letters TUE will flash to indicate the programme for Monday can be copied to Tuesday.

g.

To select a different day to copy to, press the NEXT DAY button to cycle through the days. With each press of the NEXT DAY button the message will change to indicate the new day you are copying to.

h.

When the required day is indicated, press the green button to confirm, and the message ‘MON COPIED’ will be displayed for a moment. The day into which

Mondays programme has been copied is now available to have its programme edited.

Note:

Once a day’s programme has been confirmed in this way, it now becomes the day whose programme is copied if the COPY DAY button is pressed again.

OR

Programming a Different Day: i.

Press the NEXT DAY button to select the next day, which is displayed along the top of the screen. The programme for that day can then be adjusted by following steps b – e above. Programmes for the remaining days can be set in the same way, using the NEXT DAY button to move to the next day.

10

PROGRAMMING YOUR ST9120C

Exiting Programming Mode:

To exit programming mode, move the slider to the RUN position. This can be done at any time during the programming process, and any changes made and confirmed with the button will have been saved.

Note:

If the unit is left in Programming mode for more than 10 minutes without the slider being moved or any buttons pressed, the message ‘MOVE SLIDER’ will be displayed. Press a button to continue programming, or move the slider to the RUN position.

Disabling / Enabling Time Periods

To disable any of the time periods ON 1 to OFF 1, ON 2 to OFF 2, or ON 3 to OFF 3, simply set the ON time and its paired OFF time to the same time, and the programme will just ignore them.

To re-enable the time period, simply set the two ON and OFF times to be different.

11

OPERATING YOUR ST9120C

Choosing the Operating Mode

The operating mode may only be changed when the slider is set to the RUN position.

The symbol is displayed during a programmed heating on period. A green

INDICATOR LAMP

shows when the heating is switched ON.

A MODE button is provided to select the Operating Mode and therefore how the heating is controlled.

There are four possible Operating Modes; these are OFF, AUTO, ONCE, CONT.

Pressing the MODE button scrolls round these modes in sequence, and the display indicates which mode is currently active.

• OFF mode

The system will remain OFF.

• AUTO (Automatic) mode

The system will be switched ON and OFF according to the programme.

• ONCE mode

The system will come ON at the first programmed ON time, and go OFF at the last programmed OFF time.

• CONT (Continuous) mode

The system will remain ON continuously.

Overriding the Operation Without Changing the Programmes

In AUTO and ONCE operating modes, the OVERRIDE button switches the heating

ON

or OFF without altering the programme.

When the symbol is displayed, pressing the OVERRIDE button switches the heating OFF until the next programmed ON time.

If the symbol is not displayed, pressing the OVERRIDE button switches the heating ON until the next programmed OFF time.

The LoT™ Display will provide you with information about the override.

12

OPERATING YOUR ST9120C

The Extra Hour Function

The EXTRA HOUR button allows you to switch the system ON for up to 3 extra hours without altering the programme. Pressing the button once will give one extra hour.

The LoT™ Display will display the message ‘+ 1 HOUR’, to confirm the button has been pressed.

When the heating is OFF (the symbol is not displayed), pressing the EXTRA

HOUR

button switches the heating ON for just one hour.

When the heating is ON (the symbol is displayed), pressing the EXTRA HOUR button extends the programmed ON period by one hour.

Further presses of the EXTRA HOUR button will increase the extra hour period by one hour for each button press, up to a maximum of 3 hours. The LoT™ Display will continue to provide information on the extra hour status.

To cancel the extra hours, just keep pressing the EXTRA HOUR button until the

‘CANCELLED’ message appears on the LoT™ Display.

The Holiday Function

The Holiday function allows you to switch off your system for a specified number of days (from 1-99 days). This lets you save energy and related costs when you are away from home, but resumes normal operation on the day of your return.

During this period heating will operate at the OFF (frost protection) set temperature.

To set the Holiday function: a.

Ensure the slider is in the RUN position, then press the HOLIDAY button once.

The message ‘SET HOLIDAY’ will appear briefly, followed by ‘SET DAYS AWAY’.

b.

Use the or buttons to set the number of days you will be away. The display will show the number of days, and this number will be flashing to indicate it can be changed. The day of the week will also keep changing to show the day you return.

c.

If you have made a change to the number of days, the message ‘DAYS AWAY OK ?’ will appear. Press the green button to confirm your selection.

d.

The message ‘SAVED’ will be displayed for a few seconds, followed by the date you return, to enable you to check you have programmed the holiday function correctly.

e.

During the holiday period, the LoT™ Display will show the message ‘ON

HOLIDAY’ and the display will count down the number of days till you return.

To cancel the Holiday function: f.

To cancel the Holiday function, just press the HOLIDAY button again. The LoT™

Display will show ‘CANCELLED’ and the unit will return to normal operation.

Note:

while setting the Holiday function, if there is a gap of more than 1 minute between button presses, the function will cancel itself automatically and return to normal operation.

13

OPERATING YOUR ST9120C

Enquiry Mode

As the heart of your system, the ST9120C has access to temperature information from the other system components, and allows you to enquire about this information.

To enter Enquiry Mode, ensure the slider is in the RUN position, then press and hold the button for 4 seconds.

The LoT™ Display will show the message ‘INFO MENU’ to confirm that you have entered Enquiry Mode.

Pressing the or buttons then allows you to step around and view the available information. The LoT™ Display will continue to update to tell you what information is being viewed, and the main display will show the value. If the information is not available, the display will show dashes -- -- instead of a temperature value. The table below shows the type and sequence of information available in Enquiry Mode.

To exit Enquiry Mode:

If the button is not pressed for 30 seconds, your ST9120C will return to RUN mode.

Information

* Room temperature

LoT™ Message

ROOM TEMP

* Room temperature setting

Ŧ Hot water temperature

ROOM SET

WATER TEMP

Ŧ Hot water temperature setting

WATER SET

Other display symbols

* This information will be available if you have a room temperature control system, with a DT92E room thermostat.

Ŧ This information will be available if you have a hot water control system, with a CS92A hot water sensor

/

/ /

/

14

FINE TUNING YOUR ST9120C

Changing from AM/PM Time Display to the 24 Hour Clock

Your ST9120C can operate on the 12 hour AM/PM or 24 hour clock formats. To change the format, ensure the slider is in the RUN position then press and hold the

and buttons together for about 2 seconds. Ignore the ‘NOT VALID’ message that will appear briefly. Then the displayed times will be changed automatically to the new format.

Repeating this procedure will change the clock display back to the original format.

Changing the Installer Parameters

The ST9120C has a special Installer Mode where some features can be adjusted to suit your lifestyle or preferences – these are called Installer Parameters, and are listed in the table below, along with a description of the options that are possible.

Your installer should set this up for you to suit your application (see CONFIGURATION

& SERVICE DATA section). However, you may wish to alter some of the settings yourself, and this section shows you how to do this.

Note:

some parameters indicated by * may only be viewed if the previous parameter is set to a particular value.

# Set hot water temperature is only used when the system contains a CS92A wireless hot water sensor, and is not used in this system.

INSTALLER

PARAMETER

24hr or am/pm clock display.

Configure backlight operation.

Enable/disable auto time change.

1-day or 5/2-day or

7-day operation.

Number of ON/OFFs per day.

Select default time programme.

# Set hot water temperature

Parameter

Number

1

2

3

4

5

6

8

Default

Value

12

2

1

7

3

A

60°C

Options Description

12, 24 12 = am/pm display

24 = 24hr display

0, 1, 2 0 = off

1 = on if button pressed

2 = on continuously

0, 1 0 = disabled

1 = enabled

1, 5, 7 1 = 1-day operation

5 = 5/2-day operation

7 = 7-day operation

2, 3 2 = 2 on/offs per day

3 = 3 on/offs per day

A, b, C A = standard b = at home

C = economy

40 to

85°C

Stored hot water set temperature

15

FINE TUNING YOUR ST9120C

INSTALLER

PARAMETER

Optimum start

* Optimum start limit

Optimum stop

Frost protection temperature

Minimum ON/OFF time

Cycle rate

Proportional band width

Failsafe mode (loss of

RF communications)

Reset all parameters

Parameter

Number

9

Default

Value

0

Options Description

10

11

12

13

14

15

16

20

1

0

5

1

6

1.5

0

1

1, 2,

3, 4, 5 mins

3, 6, 9,

12

1.5 to

3.0°C

0, 1

0, 1, 2 0 = no optimum start

1 = delayed start

2 = optimum start on

1, 2, 3 1 = 1 hour

2 = 2 hours

3 = 3 hours

0, 1

5 to

16°C

0 = disabled

1 = enabled

Frost protection temperature

Minimum ON/OFF time in minutes

0, 1

Number of boiler cycles per hour

Width of control proportional band in °C

0 = off

1 = heating on 20%

0 = do not reset

1 = default parameters

To Enter Installer Mode: a.

Ensure the slider is in the RUN position, then press and hold and buttons together for 8 seconds. Ignore the ‘NOT VALID’ message that is displayed for a few seconds. The message ‘SET UP MENU’ will show briefly, followed by ‘SET

INSTALLER OK ?’

b.

Press the button to take you into the Installer Mode Parameter Menu.

c.

Parameter 1 is now available to change. This is to allow you to change the clock format from 12 hour AM/PM to 24 hour. At every step, the LoT™ Display will inform you what the parameter means and what option you have selected.

The parameter number is shown on the display separated by a colon from the parameter value.

d.

You can change the parameter value by pressing the or buttons. At this point the description in the LoT™ Display will change and the parameter value will flash. If you press the value will stop flashing and be saved for use.

16

FINE TUNING YOUR ST9120C e.

Press to move to the next parameter available for editing.

f.

Keep pressing to step around the list of parameters, and use or buttons to change the parameter value.

g.

Any parameter changes that have been confirmed with the button will be saved and used.

To Exit Installer Mode: h.

You can exit Installer Mode at any time by moving the slider to the next position and then back again to RUN.

Note:

Installer Mode will exit automatically after 10 minutes if the slider is not moved.

Optimisation

The Optimisation features are explained on page 5. Parameters 9, 10, and 11 are used to enable or disable and set these features to suit your requirements. You can set Optimum Start, Delayed Start, or Optimum Stop, and you can also set a limit to the Optimum Start time of 1, 2, or 3 hours.

Note:

the radiator symbol will flash to indicate Optimisation is taking place.

The diagrams below illustrate how Optimisation works.

ON

OFF

Optimum Start

Optimum Start Programmed Time

Temperature

ON

OFF

Optimum Stop

Optimum Stop Programmed Time

Temperature

0500 0600 0700 Time

Delayed Start

Programmed Time

ON

Delayed Start

OFF

Temperature

2100 2200 2300 Time

0500 0600 0700 Time

17

BOILER SERVICE REMINDER

If your house is rented, by Law, your gas boiler should be inspected once a year to ensure it is operating safely. Your ST9120C Timer has a range of features designed to help make sure this service is carried out at the correct time. These features will be programmed by your Installer, Maintenance Engineer, or Landlord.

• If it has been set to do so, ST9120C will display a message on the screen to remind you that a boiler service is due.

• If the service is overdue, the Timer may switch off the heating system, to ensure your safety. If this happens you must arrange an immediate service visit. Contact details should be listed on page 31 of this guide, in the section Boiler & System

Service Log.

• A contact telephone number may also have been programmed into the ST9120C.

If so, a message will appear on the LoT™ Display indicating the number you should call.

Countdown to Service

Your ST9120C can indicate a countdown for the number of days until your service is due. This message will appear on the screen every few seconds, to give you an opportunity to schedule a service visit.

When Service is Due

When your boiler service is OVERDUE the words

“SERVICE DUE”

will continue to flash on your screen, and you should arrange an immediate service visit.

18

BOILER SERVICE REMINDER

Shut-down

If your ST9120C shows the words “SERVICE

DUE”

and “OFF” then your boiler service is

overdue

and the boiler has been automatically switched off to ensure your safety – you should arrange an immediate service visit.

If set to do so, it may be possible to obtain limited use of the boiler by pressing the EXTRA HOUR button. Each button press will allow operation of the boiler for 1 hour at a time, and the screen will display the message “On 1h” as shown. However, you should still arrange an immediate service visit, as this will allow you to comply with the law and ensure your gas boiler is operating safely.

Inquiring about the Set Temperature

DT92E normally displays the measured room temperature.

To inquire about the set temperature, simply press one of the or buttons.

The set temperature will be shown on the display along with the arrow symbols, and the temperature will be flashing.

Adjusting the Set Temperature

The set temperature is adjusted by pressing the or buttons. Each time one of the buttons is pressed, the set temperature will change by 0.5°C.

OPERATING YOUR DT92E

=

°C

=

°C

19

OPERATING YOUR DT92E

Switching Off

Pressing the off/standby button

for 2 seconds will switch the

DT92E into off/standby mode.

The symbol will show in the display, and the unit will control at the frost protect setpoint, as set at the ST9120C.

To switch back on, simply press the button for 2 seconds again.

Display Updates

To conserve battery power, DT92E only communicates with ST9120C at regular intervals or when you press a button. This means there can be up to a few minutes delay between an action initiated on

ST9120C and the DT92E display being updated.

If you press a button on DT92E it may take a few seconds for ST9120C to respond. DT92E will indicate it is waiting for information by displaying the hourglass symbol and dashes as shown.

Heating Indicator

The flame symbol indicates that the boiler is on for heating. The flame will disappear when there is no heating demand.

2 s

2 s

Frost Protection

The frost symbol will be displayed if the room temperature goes below the frost setting. The flame will also be displayed to indicate when the boiler has been switched on.

20

DT92E OPERATING INDICATORS

Low Battery Indicator / Battery Replacement

The battery symbol will start to flash if the battery power is running low. From this point, there will be a minimum of 4 weeks before the product will cease to function.

Batteries are accessed by unclipping the front cover at the bottom. Note battery polarity.

Reverse process to refit front cover.

2 x LR6 AA Alkaline

1

Use 2xLR6 (AA) alkaline batteries only.

2

Immediately on power up, DT92E will try to communicate and synchronise with

ST9120C. This process may take up to 4 minutes, and will be indicated by the word

‘Sync’

on the DT92E display.

RF Communications Indicator

A brief flash of the RF symbol indicates the DT92E has been communicating with the other system controls.

Lockout

Your DT92E works in conjunction with the ST9120C time control. If the timer is set to OFF or CONT it may not be possible to override it from the thermostat and this is indicated by the lockout symbol set the Mode to AUTO, ONCE, or CONT.

. To switch the heating on you must go to the timer and

21

DT92E ENERGY SAVING ECO FEATURE

The ECO button allows you to change to a lower, energy saving set temperature for a period of your choice, from 1 to 24 hours. This temperature is pre-set in the DT92E

Installer Mode, but you can adjust this to any temperature you want when ECO mode has been activated. The default ECO temperature is 18°C.

At the end of the time period, the thermostat will return to its original set temperature.

Entering ECO Mode and Setting the Energy Saving Time Period

Press the green ECO button to enter ECO mode. The word ECO will appear on the display and the thermostat will allow you to set the number of hours you want to be at the new set temperature.

Use the and buttons to set the hours, up to a maximum of 24 hours.

Please note – ECO mode is not accessible in Holiday mode or if Service shutdown has occurred.

1,2,3,4....,24hr

5 s

What Happens in ECO Mode?

In ECO mode, the display will show a countdown of the remaining time (hours and minutes) in ECO mode, identified by the hourglass symbol. The display will alternate every 5 seconds to show the current room temperature.

When in ECO mode, pressing the or buttons will adjust the set temperature for the remainder of the ECO time period.

22

5 s

5 s

DT92E ENERGY SAVING ECO FEATURE

How to Exit ECO Mode

To exit ECO mode, simply press the green

ECO button again. ECO will disappear from the display and the thermostat will control to its previous set temperature.

FINE TUNING YOUR DT92E

Changing the DT92E Installer Parameters

The DT92E has a special Installer Mode where some features can be adjusted to suit your lifestyle or preferences – these are called Installer Parameters, and are listed in the table below, along with a description of the options that are possible.

Your installer should set this up for you to suit your application (see CONFIGURATION

& SERVICE DATA section). However, you may wish to alter some of the settings yourself, and this section shows you how to do this.

INSTALLER

PARAMETER

Temperature measurement offset

Upper setpoint limit

Lower setpoint limit

Energy saving ECO setpoint

Reset parameters to factory settings

Parameter Default

Value

t0 0 uL

LL

ES

FS

35

5

18

1

Options Description

-3 to 3 K Offset to measured temperature

21 to

35°C

Upper set temperature limit in °C

5 to 21°C Lower set temperature limit in °C

5 to 35°C Energy saving ECO set temperature in °C

0, 1 Parameter will be set to 0 if any of the other parameter values have been changed. Set to 1 to get back to factory settings.

23

FINE TUNING YOUR DT92E

To Enter Installer Mode:

3 s

2 s a.

Hold the button for 2 seconds until DT92E is in standby mode.

b.

Hold and buttons for 3 seconds until the word ‘Inst’ appears on the display.

c.

Press the button.

The first parameter is now ready to be changed.

To Select a Parameter:

Use the and buttons to move from one parameter to the next. Stop at the Parameter you wish to change.

To Change a Parameter:

Use the standby button to select the parameter value, then the and buttons to change the value. Confirm the change by pressing the button again to take you back to the parameter.

To Exit Installer Mode:

Hold the button for 3 seconds to exit Installer

Mode.

Note:

The Installer Mode will exit automatically after 10 minutes if no adjustments have been made in this time.

3 s

24

OPERATING YOUR BDR91T RELAY BOX (IF INSTALLED)

Automatic Operation

The BDR91T relay box simply switches the boiler on and off according to a wireless signal it receives from the ST9120C timer. It is mainly used when the boiler is installed in a remote location where it may be difficult to run wires direct from the timer. The green light indicates the status of the relay output:

Green light on = relay on

Green light off = relay off

Green LED

Red LED

Temporary Manual Override

In normal operation it should not be necessary to interact with the BDR91T. However it is possible to press the button and temporarily override the current relay position. This will be cancelled as soon as the

Relay Box receives another signal from the ST9120C timer, because automatic operation has a higher priority than manual operation.

Push button

Loss of Wireless Communications

If the RF communication is lost for a period of 1 hour the red light will illuminate.

The Relay Box will then enter the failsafe mode as selected by your Installer (see page 30).

When RF communication is restored, the Relay Box will automatically return to normal operation.

25

FAQ AND TROUBLESHOOTING

How do I set the time only, if the ST9120C clock is not correct?

Your ST9120C contains an accurate digital clock that is factory set. Should you ever need to change the time, just follow this procedure:

a.

Move the slider to the DAY/TIME position.

b.

Keep pressing the green button until the message ‘SET THE TIME’ is displayed. To change the time, press the or buttons until the correct time is shown. The message ‘IS TIME OK?’ will be displayed. Press the green button to confirm the time is correct. If you have made a change, the message

‘TIME SAVED’ will show, followed quickly by ‘DATE + TIME COMPLETE’.

c.

Move the slider to the RUN position, to complete changing the time.

What do I do when the clocks go back in October and forward in March?

Your ST9120C is factory set to change the clock automatically at the correct dates, so you should never need to adjust the clock forward or backwards yourself. It is possible to disable this particular feature, as described in the section ‘Changing the

Installer Parameters

’ (page 15). You may also check the section ‘Configuration &

Service Data

’ (page 30) to see how your Installer has configured your product.

What should I do if I get ‘lost’ while programming the ST9120C?

The LoT™ Display on ST9120C will provide you with help and tips to work through the programming. Should you ever get ‘lost’, the simplest thing to do is to move the slider to the RUN position, and then move it back to the appropriate programming position where you got lost. At this point just follow the instructions again.

What happens if there is a power failure?

In the event of a mains power failure, the ST9120C display will go blank, the indicator lamps will go out, and the control outputs will switch off. The real time will be constantly maintained by means of the built-in battery backup, ready to power back up as if nothing had happened when the mains power is restored. In addition, all programmes and settings are stored in a special memory (called Non

Volatile memory) which requires no power to maintain information so will be retained indefinitely.

Should the correct time and date ever be lost, for whatever reason, the message ‘SET

DATE + TIME’ will be displayed whilst the slider is in the RUN position. In this case, simply follow the procedure described under ‘Step 1: Setting the Date & Time’

(page 6). It should not be necessary to make any changes to your programmes.

26

FAQ AND TROUBLESHOOTING

How reliable is 2-way RF communication?

The 2-way RF communication (also known as wireless communication) used by

Honeywell is extremely robust and reliable. When installed correctly the Signal

Strength test feature allows the Installer to locate the system components where mutual signal reception is strong. During communication, signals are sent several times to ensure receipt, and if any message is garbled, the error detection software recognises this and ensures the message is repeated again.

What do I do if RF communication is lost?

Follow the steps in the Troubleshooting Guide on the next page. The most likely cause for loss of communications is the DT92E batteries running low on power. This will be indicated on the DT92E display by a flashing battery symbol, or the display may even be blank. Simply replace the batteries (as shown on page 21) and wait a few minutes for communications to become re-established.

If this does not resolve the problem it may be that the RF signal path between the ST9120C and the DT92E is blocked by a metal object. Check the direct path between the two devices and reposition any object that may be blocking the signal, or move the thermostat.

How do I know when to change the batteries in the DT92E room thermostat?

If the DT92E batteries need changing, the battery symbol will flash on the DT92E display. DT92E will continue to operate for at least 4 weeks after the indicator begins to flash. The ST9120C will also show the message ‘SENSOR LOW BATT’ and the radiator symbol will flash. It is important to change the DT92E batteries as soon as the low battery condition is indicated, as reduced battery power may affect the

RF signal strength and impair RF communications.

Can I override the Timer from the DT92E thermostat?

As well as changing the set temperature from the DT92E, it is also possible to override the heating system on or off from the DT92E. This is only possible if the

ST9120C is in AUTO or ONCE Modes. If ST9120C is in CONT mode it will not be possible to switch the heating off from the DT92E. Similarly, if ST9120C is in OFF mode, it will not be possible to switch the heating on from the DT92E. If these latter overrides are required it is first necessary to change the ST9120C mode setting to

AUTO or ONCE.

27

FAQ AND TROUBLESHOOTING

Troubleshooting Guide

This is a quick guide to help you diagnose and cope with possible problems with your wireless control system. For further assistance, please contact your Installer.

Symptom

ST9120C has a blank

LCD display

ST9120C indicates the system is ON, but radiators are cold and/ or taps are running with cold water.

Possible Cause

No power to the heating system

Fault in ST9120C

Temperature controls are switched off or set too low

Boiler or other system controls have malfunctioned

Fault in ST9120C ST9120C shows the message:

‘INTERNAL FAULT’

Every few seconds, the

ST9120C screen shows the message:

ST9120C is counting down the number of days until your next boiler service is due.

Although the heating is still operating, the

ST9120C screen keeps flashing the message:

The ST9120C screen shows the message:

Remedy

Check that there is power to the heating system

Call Installer

Check that the temperature controls in the system are set to appropriate levels

Call Installer

Call Installer

Your boiler service is

overdue

.

Your boiler service is overdue and the boiler has been automatically switched off to ensure your safety.

Arrange a boiler service before the counter reaches zero.

After servicing your boiler, the Service

Engineer / Installer will reset the

ST9120C to remind you when the next boiler service is due. Each service is normally a maximum of 1 year apart.

Arrange an immediate boiler service.

After servicing your boiler, the Service

Engineer / Installer will reset the

ST9120C to remind you when the next boiler service is due. Each service is normally a maximum of 1 year apart.

Arrange an immediate boiler service.

If set to do so, it may be possible to obtain limited use of the boiler by pressing the EXTRA HOUR button.

Each button press will allow operation of the boiler for 1 hour at a time, and the screen will display the message

‘On 1h’

.

After servicing your boiler, the Service

Engineer / Installer will reset the

ST9120C to remind you when the next boiler service is due. Each service is normally a maximum of 1 year apart.

28

FAQ AND TROUBLESHOOTING

Troubleshooting Guide (cont.)

Symptom Possible Cause Remedy

ST9120C shows the message ‘SENSOR LOW

BATT’ and a flashing radiator symbol

DT92E shows a flashing battery symbol

DT92E display is blank

ST9120C shows the message ‘NO SIGNAL’ and a flashing radiator symbol symbol

and DT92E shows a flashing RF

DT92E batteries are running low on power

DT92E batteries are running low on power

RF communication path between

ST9120C and

DT92E is blocked, possibly by a metal object

Change the DT92E batteries (see page

21 for how to do this)

Change the DT92E batteries (see page

21 for how to do this)

Check direct path between both products and re-position any objects that may be blocking the signal

Relocate the DT92E, if possible

ST9120C shows the message ‘NO SIGNAL’ and a flashing flame symbol

Red light on BDR91T

(if installed) is lit continuously

RF communication path between

ST9120C and

BDR91T is blocked, possibly by a metal object

Check direct path between both products and re-position any objects that may be blocking the signal

Call Installer ST9120C shows the message ‘SENSOR

FAULT’ and a flashing radiator symbol

‘

DT92E display shows

’ and a flashing spanner symbol

Fault with DT92E

29

CONFIGURATION & SERVICE DATA

Application

Insert application number as per Installation wiring diagrams:

Configuration Data (to be completed by Installer)

The tables below are for the Installer to complete to indicate how your ST9120C and

DT92E have been configured.

Configurable Features Options Factory setting

ST9120C Configuration - standard

24hr or am/pm clock display.

am/pm display

24hr display

Display backlight operation. Off on if button pressed on continuously

Automatic time change.

1-day or 5/2-day or 7-day operation.

Number of ON/OFFs per day.

Default time programme.

disabled, enabled

1-day operation

5/2-day operation

7-day operation

2 on/offs per day,

3 on/offs per day

A = standard b = at home

C = economy

From 40 to 85°C no optimum start

Hot water set temperature

Optimum start

60°C

Optimum start limit delayed start optimum start on

1 hour

2 hours

3 hours disabled Optimum stop

Minimum ON/OFF time

Cycle rate enabled

Frost protection temperature From 5 to 16°C 5°C

1, 2, 3, 4, 5 minutes 1 minute

6 cycles

Proportional band width

Failsafe mode (loss of RF communications)

3, 6, 9, 12 cycles per hour

From 1.5 to 3.0°C

Off

On 20%

1.5°C

Installer configured

(tick box or note value)

30

50047645-005 A