Honeywell ST9400A Owner Manual

Features
Easy to use slider and buttons combined with ‘LoT’™ Technology and an
‘OK’ button,allowsyoutoconfirmchangesandstayincontrol.
PLEASERESPECTYOURENVIRONMENT!
LoT™ Technologyprovidesyouwithinformative‘on-screen’feedbackandoperational
assistanceasandwhenrequired.
Takecaretodisposeofthisproductandanypackagingorliteratureinanappropriateway
Extra Large LCD (Liquid Crystal Display) with Backlight provides added user
friendlinessandclearerviewing–eveninthedark.
WHAT IS A PROGRAMMER?
...an Explanation for Householders (as recommended by the Energy Savings Trust)
Independent 1-day Heating & Hot Water Programmes let you choose settings
builtintoST9400Aforeachdayoftheweektomatchyourlifestyle,whilemaximising
energysavings,oralterthemtoyourpersonalsettings.
Programmersallowyoutoset‘On’and‘Off’timeperiods.Somemodelsswitchthecentralheating
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
yourownlifestyle.Onsomeprogrammersyoumustalsosetwhetheryouwanttheheatingandhot
watertoruncontinuously,rununderthechosen‘On’and‘Off’heatingperiods,orbepermanently
off.Thetimeontheprogrammermustbecorrect.Sometypeshavetobeadjustedinspringand
autumnatthechangesbetweenGreenwichMeanTimeandBritish
SummerTime.Youmaybeabletotemporarilyadjusttheheating
programme, for example, ‘Override’, ‘Advance’, or ‘Boost’. These
are explained in the manufacturer’s instructions. The heating will
notworkiftheroomthermostathasswitchedtheheatingoff.And,
ifyouhaveahot-watercylinder,thewaterheatingwillnotworkif
thecylinderthermostatdetectsthatthehotwaterhasreachedthe
correcttemperature.
Automatic Summer/Winter Time Changewilladjusttheclockforwardandbackward
automatically when the clocks change, saving you having to change your ST9400A
everytime.
Built-in Memoryholdsyourprogrammeindefinitely-evenifthemainspowerfails.
Energy Efficiency and the Environment
Homeenergyuseisresponsibleformorethan¼ofthetotalUKcarbonemissions
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
controlscanhelptomaximizeenergyefficiencywhilemaintainingyourcomfort.
This product and its associated documentation and packaging are protected by various intellectual
propertyrightsbelongingtoHoneywellInc.anditssubsidiariesandexistingunderthelawsoftheUK
andothercountries.Theseintellectualandpropertyrightsmayincludepatentapplications,registered
designs,unregistereddesigns,registeredtrademarks,unregisteredtrademarksandcopyrights.
Your Programmer should be used in conjunction with appropriate temperature
controls. In order to save energy the following general points should be
observed:
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.
1. Ensure your system contains a room thermostat and a hot water thermostat,
andthatbotharesettoappropriatetemperaturelevels:typically20°Cforthe
roomtemperatureandbetween55-60°Cforthehotwatertemperature.
Thisproducthasbeendesignedforapplicationsasdescribedwithinthisdocument.Foruseoutsideof
thescopeasdescribedherein,refertoHoneywellforguidance.Honeywellcannotbeheldresponsible
formisapplicationoftheproduct(s)describedwithinthisdocument.
Manufactured for and on behalf of the Environment and Combustion Controls Division of Honeywell
TechnologiesSarl,Ecublens,RouteduBois37,SwitzerlandbyitsAuthorisedRepresentativeHoneywellInc.
ST9400A – User Guide
1 Day Programmer, 2 channel
3. Think about how you use your domestic hot water – if you have a storage
system,itisnotnecessarytohavethisswitchedonallthetime,evenwhenyou
areinthehouse.
Honeywell Control Systems Ltd.
ArlingtonBusinessPark,
Bracknell
Berkshire
RG121EB
TechnicalHelpDesk:08457678999
www.honeywelluk.com
2. Programmeyourheatingandhotwatertobeoffwhenyouarenotinthehouse.
Ifyouareconcernedaboutpossiblefrostdamagetoanyexposedpipework,it
isadvisabletofitafrostprotectionsystem–yourinstallercanadviseyouabout
this.
4. Consider the heat up times required for your central heating. Every home
respondsdifferentlywhentheheatingisswitchedon.Adjustthestarttimeso
thatyouarenotcoldwhenyougetupinthemorning.Ashorterheatuptimeis
requiredforotherheatingperiods.
50022737-004A
©2007HoneywellInternationalInc.
This document is to be left with the user
and forms part of a Home Information Pack
5. In the evening, when the house is up to temperature, it is often possible to
switchofftheheatinguptoanhourbeforeyougotobed,withoutanynoticeable
reductionincomfort.
ST9400A Controls Layout
1
16
15
2
3
HOT WATER
Contents
4
5
WHAT IS A PROGRAMMER?
General Description.........................................................................................3
The way to use a Programmer.........................................................................3
6
GETTING STARTED WITH YOUR ST9400A
Step 1: Setting the Date & Time......................................................................4
Step 2: Running a Built-in Programme............................................................5
HEATING
EXTRA HOUR
EXTRA HOUR
OVERRIDE
OVERRIDE
14
DAY/TIME
OK
HOT WATER
7
8
9
HEATING
RUN
NEXT
ST9400A
13
12
11
10
1 Hot Water Operating Mode Indicator
9 Slider
2 Time Display
10 Heating Operating Mode Button
3 LoT™ Technology Display
11 OK/Next Button
4 Programme Time Markers
12 Clock – and + Buttons
5 Heating Operating Mode Indicator
13 Hot Water Operating Mode Button
6 Heating Extra Hour Button
14 Hot Water Override Button
7 Heating Indicator Lamp
15 Hot Water Indicator Lamp
8 Heating Override Button
16 Hot Water Extra Hour Button
PROGRAMMING YOUR ST9400A
The Built-in Programmes.................................................................................6
Your Personal Programme...............................................................................6
Reviewing the Programme Times....................................................................7
Modifying the Hot Water Programme..............................................................7
Exiting HOT WATER Programming Mode...............................................8
Modifying the Heating Programme..................................................................9
Exiting HEATING Programming Mode....................................................9
Disabling/Enabling Time Periods....................................................................9
CONFIGURATION & SERVICE DATA
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
OPERATING YOUR ST9400A
Choosing the Operating Mode......................................................................10
Override the Operation Without Changing the Programmes........................11
The Extra Hour Function................................................................................11
FINE TUNING YOUR ST9400A
Changing From AM/PM Time display to the 24-hour Clock..........................12
Changing the Installer Parameters................................................................12
FAQ & TROUBLESHOOTING
How do I set the time only, if the ST9400A clock is not correct?...................14
What do I do when the clocks go back in October and forward in March?..14
What should I do if I get ‘lost’ while programming the ST9400A?.................14
What happens if there is a power failure?.....................................................14
Troubleshooting Guide..................................................................................15
MINI-PROGRAMMER OPERATING INSTRUCTIONS
(Installer to tick if configured in this way)
What is a Mini-Programmer?.........................................................................16
Modifying the Heating & Hot Water Programme...........................................16
Exiting HEATING & HOT WATER Programming Mode..................................16
Disabling/Enabling Time Periods..................................................................17
Choosing the Operating Mode......................................................................17
Override and Extra Hour Functions...............................................................17
Other Functions.............................................................................................17
CONFIGURATION & SERVICE DATA
Configuration Data (to be completed by Installer)........................................18
Boiler & System Service Log.........................................................................19
Keep this document in a Home Information Pack
19
WHAT IS A PROGRAMMER?
General Description
Your Honeywell ST9400A 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 ST9400A does not directly control the temperature but works together with other
temperature controls, such as room thermostats and cylinder thermostats, to control
your heating and hot water system in your home.
ST9400A has 1-day programming and 2 on/off periods per day. It is simple to use but
still allows heating and hot water to be set at different times from each other.
The following instructions explain how to programme and use the ST9400A to
provide the most home comfort at the least cost.
The way to use a Programmer
Think about the time periods when you are typically in the house and when you are
not, and also the times when you use a lot of hot water. 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.
Other features are commonly available on the Programmer 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.
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. 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 buttons allow you to select how you want to operate heating and hot
water independently. 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.
GETTING STARTED WITH YOUR ST9400A
Your ST9400A 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 ST9400A will display text
messages at every stage to help you get the most out of your central heating and hot
water system. The ST9400A uses LoT™ Technology to constantly update the display
to give you feedback about what is required.
Step 1: Setting the Date & Time
Your ST9400A 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.
HOT WATER
HEATING
DAY/TIME
HOT WATER
HEATING
RUN
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.
GETTING STARTED WITH YOUR ST9400A
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 ST9400A Programmer will now be operating
to the built-in programmes. These have been designed to provide heating and hot
water at typical times throughout the day, but if you want to customise the settings,
please see the next section ‘PROGRAMMING YOUR ST9400A’ (page 6).
PROGRAMMING YOUR ST9400A
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 12).
Built-in Programme (Profile A)
ON 1
OFF 1
ON 2
OFF 2
ON 3
OFF 3
Heating
6:30am
8:30am
4:30pm
10:30pm
Not used
Not used
Hot Water
6:30am
8:30am
4:30pm
10:30pm
Not used
Not used
Built-in Programme (Profile b)
ON 1
OFF 1
ON 2
OFF 2
ON 3
OFF 3
Heating
6:30am
9:30am
4:30pm
11:00pm
Not used
Not used
Hot Water
6:30am
9:30am
4:30pm
11:00pm
Not used
Not used
Built-in Programme (Profile C)
ON 1
OFF 1
ON 2
OFF 2
ON 3
OFF 3
Heating
6:30am
7:30am
5:00pm
10:00pm
Not used
Not used
Hot Water
6:30am
7:30am
5:00pm
10:00pm
Not used
Not used
Your Personal Programme
The table below has been left blank for you to record your own personal programme.
For ease of use, your ST9400A is supplied as standard with only 2 on/off’s enabled. To
enable ON/OFF period 3 see Fine Tuning your ST9400A (page 12).
ON 1
Heating
Hot Water
OFF 1
ON 2
OFF 2
ON 3
OFF 3
PROGRAMMING YOUR ST9400A
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. 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 Hot Water Programme
The hot water programme has two 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 hot water to stay on past midnight, if required.
a. Move the slider to the HOT WATER position. ‘SET HOT WATER’ will show briefly
to verify this action.
HOT WATER
HEATING
DAY/TIME
HOT WATER
HEATING
RUN
b. ‘SET ON-TIME 1’ will then be displayed and the time setting for the first ON 1 time
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.
HOT WATER
HEATING
HOT WATER
HEATING
PROGRAMMING YOUR ST9400A
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 ST9400A simply moves
both times together as long as you continue to press the
or
buttons. Follow
the procedure in ‘Reviewing the Programme Times’ (page 7) 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) can be set by using the
or
buttons to change the time, and 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 2, the message ‘COMPLETE’ will
be displayed to indicate the times have been set.
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.
Note: If the unit is left in HOT WATER 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.
PROGRAMMING YOUR ST9400A
Modifying the Heating Programme
The heating programme has two 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 to stay on past midnight, if required.
a. Move the slide switch to the HEATING position. ‘SET HEATING’ will show briefly
to verify this action.
HOT WATER
HEATING
DAY/TIME
HOT WATER
HEATING
RUN
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 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.
Disabling / Enabling Time Periods (for Heating and/or Hot Water)
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.
OPERATING YOUR ST9400A
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.
A green INDICATOR LAMP shows when the heating or hot
water is switched ON.
Two MODE buttons are provided to select the Operating Mode
and therefore how the heating and hot water are controlled.
DAY/TIME
HOT WATER
HEATING
RUN
Heating has four possible Operating Modes; these are OFF, AUTO, ONCE, CONT.
Pressing the heating MODE button scrolls round these modes in sequence, and the
display indicates which mode is currently active.
HOT WATER
HEATING
HOT WATER
HEATING
• OFF mode
The heating will remain OFF.
• AUTO (Automatic) mode
The heating will be switched ON and OFF according to the heating programme.
• ONCE mode
The heating will come ON at the first programmed ON time, and go OFF at the
last programmed OFF time.
• CONT (Continuous) mode
The heating will remain ON continuously.
The hot water MODE button operates in the same way as described above for the
heating MODE button.
10
OPERATING YOUR ST9400A
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.
11
FINE TUNING YOUR ST9400A
Changing from AM/PM Time Display to the 24 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
PARAMETER
Parameter
Number
Default
Value
Options Description
24hr or am/pm
clock display.
1
12
12, 24
12 = am/pm display,
24 = 24hr display
Configure backlight
operation.
2
2
0, 1, 2
0 = off,
1 = on if button pressed,
2 = on continuously
Enable/disable auto
time change.
3
1
0, 1
0 = disabled,
1 = enabled
Number of ON/OFFs
per day.
5
2
2, 3
2 = 2 on/offs per day,
3 = 3 on/offs per day
Select default time
programme.
6
A
A, b, C
Configure
Mini-Programmer.
7
0
0,1
0 = standard Programmer,
1 = Mini-Programmer
8
1
0, 1
0 = do not reset
1 = default parameters
A = standard,
b = at home,
C = economy
This will be set by
your Installer and
will depend on your
system – do NOT
change without
contacting installer.
Reset all parameters
12
FINE TUNING YOUR ST9400A
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
buttons to change the parameter value.
g. Any parameter changes that have been confirmed with the
saved and used.
or
button will be
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.
13
FAQ AND TROUBLESHOOTING
How do I set the time only, if the ST9400A 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
ST9400A?
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.
14
FAQ AND TROUBLESHOOTING
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.
Symptom
Possible Cause
Remedy
ST9400A has a blank
LCD display
No power to the
heating system
Check that there is power to the
heating system
Fault in ST9400A
Call 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 ST9400A
Call 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.
15
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 MiniProgrammer.
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.
16
MINI-PROGRAMMER OPERATING INSTRUCTIONS
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.
17
CONFIGURATION & SERVICE DATA
Configuration Data (to be completed by Installer)
The table below is for the Installer to complete to indicate how your ST9400A has
been configured.
Configurable
Features
Options
24hr or am/pm clock
display
am/pm display
Display backlight
operation
Off
Installer Configured
(tick appropriate box)
24hr display
On if button pressed
On continuously
Automatic time
change
Enabled
Number of ON/OFFs
per day
2 on/offs per day
Default programme
A = standard
Disabled
3 on/offs per day
b = at home
C = economy
Set as
Mini-Programmer *
No
Yes
* 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.
18
50022737-004 A
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