Honeywell thermostat ST9400A 1 Day 2 Channel Programmer User Manual
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11 OPERATING YOUR ST900A Overriding the Operation Without Changing the Programmes In AUTO and ONCE operating modes, the OVERRIDE buttons switch the heating or hot water ON or OFF without altering the programme. When the indicator lamp is ON, pressing the OVERRIDE button switches the heating or hot water OFF until the next programmed ON time. When the indicator lamp is OFF, pressing the OVERRIDE button switches the heating or hot water ON until the next programmed OFF time. The LoT™ Display will provide you with information about the override. 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. The LoT™ Display will display the message ‘+ 1 HOUR’, to confirm the button has been pressed. When the green INDICATOR LAMP is OFF, pressing an EXTRA HOUR button switches the heating or hot water ON for just one hour. When the green INDICATOR LAMP is ON, pressing an EXTRA HOUR button extends the programmed ON period by one hour. Further presses of the EXTRA HOUR buttons 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.
12 FINE TUNING YOUR ST900A Changing from AM/PM Time Display to the 2 Hour Clock Your ST9400A 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. All the displayed times will be automatically changed to the new format. Repeating this procedure will change the clock display back to the original format. Changing the Installer Parameters The ST9400A 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. INSTALLER PARAMETERParameter NumberDefault ValueOptionsDescription 24hr or am/pm clock display.11212, 2412 = am/pm display,24 = 24hr display Configure backlight operation.220, 1, 20 = off, 1 = on if button pressed,2 = on continuously Enable/disable auto time change.310, 10 = disabled, 1 = enabled Number of ON/OFFs per day.522, 32 = 2 on/offs per day,3 = 3 on/offs per day Select default time programme.6AA, b, CA = standard, b = at home,C = economy Configure Mini-Programmer. This will be set by your Installer and will depend on your system – do NOT change without contacting installer. 700,10 = standard Programmer,1 = Mini-Programmer Reset all parameters810, 10 = do not reset1 = default parameters
1 FINE TUNING YOUR ST900A 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. 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.
1 FAQ AND TROUBLESHOOTING How do I set the time only, if the ST900A clock is not correct? Your ST9400A contains a very accurate digital clock that is factory pre-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 ST9400A is factory-set to adjust 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 12). You may also check the section ‘Configuration & Service Data’ (page 18) to see how your Installer has configured your product. What should I do if I get ‘lost’ while programming the ST900A? The LoT™ Display on ST9400A 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 ST9400A 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 NV memory) which requires no power to maintain information, and 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 4). It should not be necessary to make any changes to your programmes.
1 SymptomPossible CauseRemedy ST9400A has a blank LCD displayNo power to the heating systemCheck that there is power to the heating system Fault in ST9400ACall Installer ST9400A indicates that Heating and/or Hot Water are ON, but radiators are cold and/or taps are running with cold water. Temperature controls are switched off or set too low Check that the temperature controls in the system are set to appropriate levels Boiler or other system controls have malfunctioned Call Installer ST9400A shows the message ‘INTERNAL FAULT’ Fault in ST9400ACall Installer When the slider is moved to the HOT WATER position, the display shows ‘NOT VALID’ ST9400A has been configured as a Mini-Programmer Check the Contents page of this booklet or the ‘Configuration & Service Data’ section (page 18) to see if your ST9400A has been configured as a Mini-Programmer. Call Installer to check if this is correct for your heating system. Troubleshooting Guide This is a quick guide to help you diagnose and cope with possible problems with ST9400A. For further assistance, please contact your Installer. FAQ AND TROUBLESHOOTING
1 MINI-PROGRAMMER OPERATING INSTRUCTIONS You need only refer to this section if: • The Mini-Programmer box is ticked on the Contents page of this booklet, or • The ST9400A Configuration Data (page 18) indicates it is set as a Mini-Programmer. What is a Mini-Programmer? In a poorly controlled gravity circulation hot water system, whenever the boiler comes on to service the heating, there will inevitably be some circulation though the hot water storage tank, which will then heat up. So, whenever the HEATING is ON, the HOT WATER is also ON. It is therefore NOT possible to have independent programmes for heating and hot water, so it is only necessary to enter one time programme. If you have this type of installation (gravity circulation hot water circuit WITHOUT a hot water control valve), your Installer should have restricted the ST9400A Programmer to be a Mini-Programmer. This section describes how to use the product as a Mini-Programmer. Modifying the Heating & Hot Water Programme The heating & hot water 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 the heating & hot water to stay on past midnight, if required. a. Move the slider to the HEATING position. ‘SET HEATING’ will show briefly to verify this action. b. Now follow the same procedure to set the times as described in ‘Modifying the Hot Water Programme’ (page 7) steps b to e. Exiting Heating & Hot Water Programming Mode: To exit HEATING 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 HEATING 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 finish programming, or move the slider to the RUN position.
1 Disabling / Enabling Time Periods To disable any of the time periods ON 1 to OFF 1 or ON 2 to OFF 2, 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. Choosing the Operating Mode In a Mini-Programmer, some Operating Modes are not possible. For example, HEATING in AUTO mode and HOT WATER in OFF mode is not allowed. When configured, your ST9400A knows which combinations of Operating Mode are possible, and only permits those combinations that are allowed. Override and Extra Hour Functions When you use the hot water OVERRIDE or EXTRA HOUR functions, they will operate as normal. However, the heating OVERRIDE or EXTRA HOUR functions will also bring on the hot water. This is a consequence of the type of system you have, and is perfectly normal. Other Functions All other functions operate the in the same way as for the standard ST9400A. MINI-PROGRAMMER OPERATING INSTRUCTIONS
150022737-004 A CONFIGURATION & SERVICE DATA Configurable FeaturesOptionsInstaller Configured (tick appropriate box) 24hr or am/pm clock displayam/pm display 24hr display Display backlight operationOff On if button pressed On continuously Automatic time changeEnabled Disabled Number of ON/OFFs per day2 on/offs per day 3 on/offs per day Default programmeA = standard b = at home C = economy Set as Mini-Programmer *No Yes Configuration Data (to be completed by Installer) The table below is for the Installer to complete to indicate how your ST9400A has been configured. * Note: It is recommended that gravity circulation hot water systems are fitted with a suitable hot water control valve as shown in the Honeywell Sundial C Plan system (see ST9400A/ST9400C Installation Instruction sheet). If so, then there is no need to set the ST9400A as a Mini-Programmer.