Honeywell Sundial RF Pack 3 Wireless Enabled Programmer and Thermostats User Manual

11
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.
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 continue programming, or move...

12
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.
The  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.
Two  MODE buttons are provided to select the Operating Mode and therefore how the 
heating and hot water are controlled.
Heating...

13
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.  The LoT™ Display will display the message ‘+1HR’, to confi\
rm the 
button has been pressed. 
When the heating or hot water are OFF (the  or  symbols are not displayed), 
pressing an EXTRA HOUR button switches the heating or hot water ON for...

14
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.
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...

15
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 
  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....

16
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 t\
he 
clock format from 12 hour AM/PM to 24 hour. At every step, the LoT™...

17
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   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...

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...

19
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. 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...

20
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 
the 
 button again.
 
Display Updates
To conserve battery power, DT92E only communi-
cates with ST9420C 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...