Honeywell Sundial RF Pack 4 Wireless Enabled Timer and Cylinder Thermostat User Manual

User Guide
Y9120W Sundial RF2 Pack 4
How to use:
  ST9120C Wireless Enabled Timer
  CS92A Wireless Cylinder Thermostat
Honeywell Control Systems Ltd.
Arlington Business Park,
Bracknell
Berkshire
RG12 1EB
Technical Help Desk: 08457 678999
www.honeywelluk.com 50047645-002 A
© 2011 Honeywell International Inc.
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...

27Keep this document in a Home Information Pack
This product and its associated documentation and packaging are protected by various intellectual 
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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,...

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Contents
CONTROL OF YOUR SYSTEM
 General Description of Controls in Your System ............................................... 4
  The way to use a Timer  ........................................................................\
............. 4
  Your Cylinder Thermostat  ........................................................................\
......... 5
GETTING STARTED WITH YOUR ST9120C
  Step 1: Setting the Date & Time  ....................................................................... 6...

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General Description of Controls in Your System
Your Honeywell ST9120C provides timing control for your hot water system, letting 
you set ON and OFF periods to suit your own lifestyle. 
The ST9120C does not directly control the temperature but works together with a 
CS92A wireless cylinder thermostat.
With 7-day programming and up to 3 on/off periods per day, every day can be set 
differently.
ST9120C also has a Boiler Service reminder / Shut-down feature, which helps 
ensure your gas boiler is...

5
A typical use of the EXTRA HOUR button would be if you returned to the house for 
a short period when the hot water was off. Pressing the EXTRA HOUR button gives 
you 1, 2, or 3 hours of hot water, exactly when you need it. Another typical use is 
when the hot water 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 hot water normally goes off.
The MODE button allows you to select how you want...

6
Your ST9120C 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 ST9120C will display text 
messages at every stage to help you get the most out of your central heating system. 
The ST9120C uses LoT™ Technology to constantly update the display to give you 
feedback about what is required.
Step 1: Setting the Date & Time
Your ST9120C...

7
GETTING STARTED WITH YOUR ST9120C
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  ST9120C
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  ST9120C
Reviewing the Programme Times
To review your programme, move the slider to the PROGRAMME 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 Programme
The programme...

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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 ST9120C simply moves 
both times together as long as you continue to press the 
  or  buttons.  Follow 
the procedure...