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18

BOILER SERVICE REMINDER

FINE TUNING YOUR  ST9420C

If your house is rented, by Law, your gas boiler should be inspected once a year 

to ensure it is operating safely. Your ST9420C Programmer 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, ST9420C will display a message on the screen to 

remind you that a boiler service is due.

•  If the service is overdue, the Programmer 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 35 of this guide, in the section Boiler & 

System Service Log.

•  A contact telephone number may also have been programmed into the ST9420C. 

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

should call.

Countdown to Service

Your ST9420C 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.

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. The temperature is set to 60°C at the factory, but can be set anywhere 

between 40°C and 85°C, depending on the application. The setting is changed by 

entering Installer Mode and modifying parameter number 8 to give the required set 

temperature.

Содержание BDR91T

Страница 1: ...he 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 th...

Страница 2: ...neywell 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 iss...

Страница 3: ...r Hot Water Set Temperature 18 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 RF Communications Indicator Lockout 21 DT92E ENERGY SAVING EC...

Страница 4: ...omfort 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 1 hours dep...

Страница 5: ...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 ...

Страница 6: ... followed by SET THE DAY and the day of the month will now be flashing to indicate it can be changed GETTING STARTED WITH YOUR ST9420C HOT WATER HEATING DAY TIME HOT WATER HEATING RUN 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 ...

Страница 7: ...ve 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 ...

Страница 8: ...in Programme Profile b ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3 Monday to Friday Heating 6 30am 9 30am 12 00pm 1 00pm 4 30pm 11 00pm Hot Water 6 30am 9 30am 12 00pm 1 00pm 4 30pm 11 00pm Saturday Sunday Heating 6 30am 9 30am 12 00pm 1 00pm 4 30pm 11 00pm Hot Water 6 30am 9 30am 12 00pm 1 00pm 4 30pm 11 00pm Built in Programme Profile C ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3 Monday to Friday Heating 6 30am 7 30a...

Страница 9: ...he 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 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 mo...

Страница 10: ...ext 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 ...

Страница 11: ...NG 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 9 steps b to i 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...

Страница 12: ... 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 Overriding the Operation Without Ch...

Страница 13: ... but resumes normal operation on the day of your return During this period heating will operate at the OFF frost protection set temperature and the hot water will remain off 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...

Страница 14: ...ormation 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 ST9420C will return to RUN mode Information LoT Message Other display symbols Room ...

Страница 15: ...s 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 INSTALLER PARAMETER Parameter Number Default Value Options Descr...

Страница 16: ...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 INSTALLER PARAMETER Parameter Number Default Value Options Description Optimum start 9 0 0 1 2 0 no optimum start 1 delayed start 2 optimum start on Optimum start limit 10 1 1 2 3 1 1 hour 2 2 hours 3 3 hours Optim...

Страница 17: ...misation 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...

Страница 18: ...r may also have been programmed into the ST9420C If so a message will appear on the LoT Display indicating the number you should call Countdown to Service Your ST9420C 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 i...

Страница 19: ...own 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 BOILER SERVICE REMINDER OPERATING YOUR DT92E 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...

Страница 20: ...can be up to a few minutes delay between an action initiated on ST9420C and the DT92E display being updated If you press a button on DT92E it may take a few seconds for ST9420C 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 whe...

Страница 21: ... power up DT92E will try to communicate and synchronise with ST9420C 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 ST9420C time control If the timer is set to OFF or ...

Страница 22: ...CO 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 What Happens in ECO Mode In ECO mode the display will show a countdown of...

Страница 23: ...s you how to do this INSTALLER PARAMETER Parameter Default Value Options Description Temperature measurement offset t0 0 3 to 3 K Offset to measured temperature Upper setpoint limit uL 35 21 to 35 C Upper set temperature limit in C Lower setpoint limit LL 5 5 to 21 C Lower set temperature limit in C Energy saving ECO setpoint ES 18 5 to 35 C Energy saving ECO set temperature in C Reset parameters ...

Страница 24: ... 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 m...

Страница 25: ...pping the front cover at the bottom Note battery polarity Reverse process to refit front cover Use 2xLR6 AA alkaline batteries only Error Indications To save battery power CS92A will indicate error conditions on the LoT Display of ST9420C It is possible to view the CS92A sta tus by pressing the button on the transceiver box The lights underneath this button will provide feedback as shown in the ta...

Страница 26: ...ble 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 ST9420C because automatic operation has a higher priority than manual operation 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 mod...

Страница 27: ...r Installer has configured your product What should I do if I get lost while programming the ST9420C The LoT Display on ST9420C 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 i...

Страница 28: ...E 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 CS92A cylinder sensor If the CS92A batteries need changing the ST9420C will show the message SENSOR LOW BATT and the tap symbol will flash You can confirm this by pressing the CS92A button whe...

Страница 29: ...the counter reaches zero After servicing your boiler the Service Engineer Installer will reset the ST9420C to remind you when the next boiler service is due Each service is normally a maximum of 1 year apart Although the heating is still operating the ST9420C screen keeps flashing the message Your boiler service is overdue Arrange an immediate boiler service After servicing your boiler the Service...

Страница 30: ...ce is due Each service is normally a maximum of 1 year apart ST9420C shows the message SENSOR LOW BATT and a flashing radiator symbol Your DT92E batteries are running low on power Change the DT92E batteries see page 21 for how to do this DT92E shows a flashing battery symbol DT92E display is blank ST9420C shows the message SENSOR LOW BATT and a flashing tap symbol Your CS92A batteries are running ...

Страница 31: ...tery power Your CS92A batteries are running low on power Change the CS92A batteries This is located next to your hot water storage tank see page 25 for description of how to change the batteries RF communication path between ST9420C and CS92A is blocked possibly by a metal object Check direct path between both products and re position any objects that may be blocking the signal ST9420C shows the m...

Страница 32: ...p symbol CS92A sensor error indication Press CS92A button and red light blinks 0 5s on 0 5s off Note light will switch off after approx 1 minute to save battery power CS92A sensor cable may be disconnected from the wiring terminals Re connect the sensor wired to the CS92A terminals Fault with CS92A Call Installer ...

Страница 33: ...33 ...

Страница 34: ... button pressed on continuously Automatic time change disabled enabled 1 day or 5 2 day or 7 day operation 1 day operation 5 2 day operation 7 day operation Number of ON OFFs per day 2 on offs per day 3 on offs per day Default time programme A standard b at home C economy Hot water set temperature From 40 to 85 C 60 C Optimum start no optimum start delayed start optimum start on Optimum start limi...

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