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Honeywell Y9420S User Manual
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Honeywell Y9420S User Manual

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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 hot-
water 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
50047645-008 A
Technical Help Desk: 08457 678999
www.honeywelluk.com
© 2011 Honeywell International Inc.
User Guide
2
Y9420S Sundial RF
Pack 3
How to use:
ST9420C Wireless Enabled Programmer
DT92E Wireless Room Thermostat
CS92A Wireless Cylinder 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
ST9420C
DT92E
(typically in living room or hallway)
CS92A
(typically next to hot water tank, in bedroom)
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 Programmer 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 and a hot water thermostat,
and that both are set to appropriate temperature levels: typically 20°C for the
room temperature and between 50 - 60°C for the hot water temperature.
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.

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  • Page 1 50047645-008 A switch off the heating up to an hour before you go to bed, without any noticeable Technical Help Desk: 08457 678999 and forms part of a Home Information Pack reduction in comfort. www.honeywelluk.com © 2011 Honeywell International Inc.
  • Page 2 Heating ‘ON’ period indicator Holiday Button 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 Heating Extra Hour Button Copy Day Button and other countries.

  • Page 3: Table Of Contents

    Contents CONTROL OF YOUR SYSTEM General Description of Controls in Your System ...........4 The way to use a Programmer ................4 The way to use a Room Thermostat / Control of Your Boiler / Optimisation ..5 GETTING STARTED WITH YOUR ST9420C Step 1: Setting the Date &...

  • Page 4: Control Of Your System

    CONTROL OF YOUR SYSTEM General Description of Controls in Your System Your Honeywell ST9420C provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle. The ST9420C does not directly control the temperature but works together with other temperature controls, such as room thermostats and cylinder thermostats or sensors, to control your heating and hot water system in your home.

  • Page 5: The Way To Use A Room Thermostat / Control Of Your Boiler / Optimisation

    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 and hot water were off. Pressing the appropriate EXTRA HOUR button gives you 1, 2, or 3 hours of heating, exactly when you need it.

  • Page 6: Getting Started With Your St9420C

    CONTROL OF YOUR SYSTEM 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.

  • Page 7: Step 2: Running A Built-In Programme

    GETTING STARTED WITH YOUR ST9420C b. To change the day of the month, press the 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.

  • Page 8: Programming Your St9420C

    PROGRAMMING YOUR ST9420C 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).

  • Page 9: Reviewing The Programme Times / Modifying The Hot Water Programme

    PROGRAMMING YOUR ST9420C Reviewing the Programme Times To review your hot water programme, move the slider to the HOT WATER position. To review your heating programme, move the slider to the HEATING position. To review the programme times, press the button repeatedly.
  • Page 10 PROGRAMMING YOUR ST9420C 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.

  • Page 11: Modifying The Heating Programme / Disabling Or Enabling Time Periods

    PROGRAMMING YOUR ST9420C Exiting HOT WATER Programming Mode: To exit HOT WATER 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.

  • Page 12: Operating Your St9420C

    OPERATING YOUR ST9420C Choosing the Operating Mode (for Heating and/or Hot Water) The operating mode may only be changed when the slider is set to the RUN position. symbol is displayed during a programmed heating on period, and a symbol is displayed during a programmed hot water on period. A green INDICATOR LAMP shows when the heating or hot water is switched ON.

  • Page 13: The Extra Hour Function / The Holiday Function

    OPERATING YOUR ST9420C The Extra Hour Function (for Heating and/or Hot Water) The EXTRA HOUR buttons allow you to switch the heating or hot water ON for up to 3 extra hours without altering the programme. Pressing either button once will give one extra hour.

  • Page 14: Enquiry Mode

    OPERATING YOUR ST9420C Enquiry Mode As the heart of your system, the ST9420C 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.

  • Page 15: Fine Tuning Your St9420C

    FINE TUNING YOUR ST9420C Changing from AM/PM Time Display to the 24 Hour Clock Your ST9420C 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 buttons together for about 2 seconds.
  • Page 16 FINE TUNING YOUR ST9420C INSTALLER Parameter Default Options Description PARAMETER Number Value Optimum start 0, 1, 2 0 = no optimum start 1 = delayed start 2 = optimum start on * Optimum start limit 1, 2, 3 1 = 1 hour 2 = 2 hours 3 = 3 hours Optimum stop...

  • Page 17: Optimisation

    FINE TUNING YOUR ST9420C e. Press to move to the next parameter available for editing. f. Keep pressing to step around the list of parameters, and use buttons to change the parameter value. g. Any parameter changes that have been confirmed with the button will be saved and used.

  • Page 18: How To Set Your Hot Water Set Temperature

    FINE TUNING YOUR ST9420C How to set your Hot Water Set Temperature If your system includes a CS92A hot water sensor on your hot water storage tank, you will be able to set the hot water temperature you require at the ST9420C programmer.

  • Page 19: Shut-Down

    BOILER SERVICE REMINDER Shut-down If your ST9420C 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 any EXTRA HOUR button.

  • Page 20: Switching Off / Display Updates / Heating Indicator / Frost Protection

    OPERATING YOUR DT92E Switching Off Pressing the off/standby button 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 ST9420C. To switch back on, simply press button again.

  • Page 21: Dt92E Operating Indicators

    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 2 x LR6 AA Alkaline cease to function.

  • Page 22: Dt92E Energy Saving Eco Feature

    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.

  • Page 23: How To Exit Eco Mode

    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 –...
  • Page 24 FINE TUNING YOUR DT92E To Enter Installer Mode: a. Hold the button for 2 seconds until DT92E is in standby mode. b. Hold 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 buttons to move from one parameter...

  • Page 25: Operating Your Cs92A Hot Water Thermostat

    OPERATING YOUR CS92A HOT WATER THERMOSTAT Basic Operation Sensor element Transceiver Your CS92A consists of a sensor element that is strapped to the metal surface of the hot water cylinder and a wireless transceiver box that is normally mounted on a wall surface apart from the cylinder.

  • Page 26: Operating Your Bdr91T Relay Box (If Installed)

    OPERATING YOUR BDR91T RELAY BOX (IF INSTALLED) BDR91T Controls Layout Green light, relay status indicator Push button Red light, indicator for special modes or loss of communications Automatic Operation The BDR91T relay box simply switches the boiler Green LED on and off according to a wireless signal it receives from the ST9420C.

  • Page 27: Faq And Troubleshooting

    FAQ AND TROUBLESHOOTING How do I set the time only, if the ST9420C clock is not correct? Your ST9420C contains an accurate digital clock that is factory set. Should you ever need to change the time, just follow this procedure: a.
  • Page 28 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.

  • Page 29: Troubleshooting Guide

    FAQ AND TROUBLESHOOTING Can I override the Programmer 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 ST9420C is in AUTO or ONCE Modes.
  • Page 30 FAQ AND TROUBLESHOOTING Symptom Possible Cause Remedy The ST9420C screen shows Your boiler service Arrange an immediate boiler the message: is overdue and service. the boiler has If set to do so, it may be been automatically possible to obtain limited use switched off to of the boiler by pressing any ensure your safety.
  • Page 31 FAQ AND TROUBLESHOOTING Symptom Possible Cause Remedy ST9420C shows the Your DT92E Change the DT92E batteries message ‘NO SIGNAL’ and batteries are (see page 21 for how to do this). a flashing radiator symbol running low on power. DT92E shows a flashing RF RF communication Check direct path between both symbol...
  • Page 32 FAQ AND TROUBLESHOOTING Symptom Possible Cause Remedy ST9420C shows the CS92A sensor Re-connect the sensor wired to message ‘SENSOR FAULT’ cable may be the CS92A terminals. and a flashing tap symbol disconnected from the wiring terminals. Fault with CS92A Call Installer CS92A sensor error indication (Press CS92A button and red light blinks...

  • Page 34: Configuration & Service Data

    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 ST9420C and DT92E have been configured. Configurable Features Options Factory Installer configured...

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