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

User Guide
Y9420S Sundial RF2 Pack 3
How to use:
  ST9420C Wireless Enabled Programmer
  DT92E Wireless Room Thermostat
  CS92A Wireless Cylinder Thermostat
  BDR91T Wireless Enabled Relay Box (if installed) System Components
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...

HOT WATERHEATING
EXTRA HOUR
OVERRIDE EXTRA HOUR
OVERRIDE
NEXT
D AY
COPY
D AY
HOLIDAY
OK
NEXT DAY/TIME
HOT WATER HEATING RUN
Hot Water ‘ON’ period indicator
Time Display
LoT™ Technology Display
Programme Time Markers
Day of Week Indicator
RF Symbol
Heating ‘ON’ period indicator
Heating Extra Hour Button
Heating Indicator Lamp
Heating Override Button
Boiler Status Indicator
Slider
ECO Mode Active
Frost Protect Indicator
ECO Countdown Indicator
Heating Demand Indicator
Setpoint Change Buttons
ECO Button...

3
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 & Time ........................................................................\
.... 6
  Step 2: Running a...

4
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.
With 7-day programming and up to 3 on/off periods per day, every...

5
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...

6
Your ST9420C 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 ST9420C will display text 
messages at every stage to help you get the most out of your central heating and hot 
water system. The ST9420C uses LoT™ Technology to constantly update the display 
to give you feedback about what is required.
Step 1: Setting the Date &...

7
GETTING STARTED WITH YOUR ST9420C
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...

8
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).
 Built-in Programme (Profile A)ON 1OFF 1 ON 2OFF 2 ON 3OFF 3
Monday to 
Friday...

9
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. 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...

10
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 ST9420C simply moves 
both times together as long as you continue to press the 
  or  buttons.  Follow 
the procedure...