Honeywell Y9120W 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 systems based on
boilers account for of this figure, so it is important to understand how your
controls can help to maximize energy efficiency while maintaining your comfort.
Your Timer should be used in conjunction with appropriate temperature controls. In
order to save energy the following general points should be observed:
1. Ensure your system contains a room thermostat (where appropriate) and a hot
water thermostat, and that it is set to an appropriate temperature level, typically
20°C
2. Programme your heating (and hot water) to be off when you are not in the
house. If you are concerned about possible frost damage to any exposed pipe
work, it is advisable to fit a frost protection system – your installer can advise
you about this.
3. Think about how you use your domestic hot water – if you have a storage
system, it is not necessary to have this switched on all the time, even when you
are in the house.
4. Consider the heat up times required for your central heating. Every home
responds differently when the heating is switched on. Adjust the start time so
that you are not cold when you get up in the morning. A shorter heat up time is
required for other heating periods.
5. In the evening, when the house is up to temperature, it is often possible to
switch off the heating up to an hour before you go to bed, without any noticeable
reduction in comfort.
PLEASE RESPECT YOUR ENVIRONMENT!
Take care to dispose of this product and any
packaging or literature in an appropriate way
This document is to be left with the user
and forms part of a Home Information Pack
WHAT IS A PROGRAMMER?
...an Explanation for Householders (as recommended by the Energy Savings Trust)
Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central heating 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 your own lifestyle. On
some programmers you must also set whether you want the 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 the manufacturer’s instructions. The heating will not work
if the room thermostat has switched the heating off. And, if you have a hotwater cylinder, the water heating will not work if the cylinder thermostat
detects that the hot water has reached the correct temperature.
WHAT IS A CYLINDER THERMOSTAT?
...an explanation for Householders (as recommended by the Energy Savings Trust)
A cylinder thermostat switches on and off the heat supply from the boiler to the hot water cylinder.
It works by sensing the temperature of the water inside the cylinder, switching on the water heating
when the temperature falls below the thermostat setting, and switching it off once this set temperature
has been reached.
Turning a cylinder thermostat to a higher setting will not make the water heat up any faster. How quickly
the water heats up depends on the design of the heating system, for example, the size of boiler and
the heat exchanger inside the cylinder.
The water heating will not work if a time-switch or programmer has switched it off. And the cylinder
thermostat will not always switch the boiler off, because the boiler sometimes needs to heat the
radiators.
Cylinder thermostats are usually fitted between one quarter and one third of the way up the cylinder.
The cylinder thermostat will have a temperature scale marked on it, and it should be set at between
60C and 65C, then left to do its job. This temperature is high enough to kill off harmful bacteria in the
water, but raising the temperature of the stored hot water any higher will result in wasted energy and
increase the risk of scalding.
Location
ST9120C
CS92A
(typically next to hot water cylinder, in bedroom)
This section is to be completed by the Installer
27
Keep this document in a Home Information Pack
This product and its associated documentation and packaging are protected by various intellectual
property rights belonging to Honeywell 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 issued instructions and is only applicable to the product(s) described.
This product has been designed for applications as described within this document. For use outside of
the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be held responsible
for misapplication of the product(s) described within this document.
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell
Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised
Representative Honeywell Inc.
CONFIGURATION & SERVICE DATACS92A CONTROLS LAYOUT
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
ST9120C CONTROLS LAYOUT
Sensor element Transceiver
Green light
(under button)
Button
Red light
(under button)
3
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
Step 2: Running a Built-in Programme .............................................................7
PROGRAMMING YOUR ST9120C
The Built-in Programmes / Your Personal Programme......................................8
Reviewing the Programme Times .....................................................................9
Modifying the Programme ................................................................................9
Disabling / Enabling Time Periods .................................................................11
OPERATING YOUR ST9120C
Choosing the Operating Mode .......................................................................12
Overriding the Operation Without Changing the Programmes.......................12
The Extra Hour Function .................................................................................13
The Holiday Function ......................................................................................13
Enquiry Mode .................................................................................................14
FINE TUNING YOUR ST9120C
Changing from AM/PM Time Display to the 24 Hour Clock............................15
Changing the Installer Parameters .................................................................15
BOILER SERVICE REMINDER
Countdown to Service / When Service is Due ................................................18
Shut-down .......................................................................................................19
OPERATING YOUR CS92A HOT WATER THERMOSTAT
Basic Operation ..............................................................................................19
Battery Replacement ......................................................................................19
Error Indications .............................................................................................20
FAQ AND TROUBLESHOOTING
Frequently Asked Questions ..........................................................................21
Troubleshooting Guide ...................................................................................23
CONFIGURATION & SERVICE DATA (to be completed by Installer) .................26
4
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 regularly serviced in compliance with UK Gas Safety
Regulations. For more details see pages 18 & 19.
Your system includes a CS92A wireless cylinder thermostat and may include
other Honeywell wireless controls. These products use state of the art 2 way RF
communications to share information and give you robust and flexible control of your
indoor environment.
The following instructions explain how to programme and use the ST9120C, and
associated controls, to provide the most home comfort at the least cost.
The way to use a Timer
Think about the time periods when you are typically in the house and when you are not.
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 Timer 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 hot water is off. Just press the OVERRIDE button and
the hot water 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.
CONTROL OF YOUR SYSTEM
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 to operate your hot water. A
typical use of this feature would be 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.
Your Cylinder Thermostat
Your CS92A wireless cylinder thermostat measures the water temperature and signals
this to the ST9120C timer. The timer then performs all the necessary control actions to
maintain the water temperature at the set value. The set temperature is programmed by
your Installer in the ST9120C Installer Mode, and you should never need to change this.
A value of 60°C is typical.
CONTROL OF YOUR SYSTEM (CONT.)
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 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.
GETTING STARTED WITH YOUR ST9120C
DAY/TIME
PROGRAMME
RUN
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 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.
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 ST9120C Timer will now be operating to the
built-in programmes. These have been designed to provide hot water at typical times
throughout the day, but if you want to customise the settings, please see the next
section ‘PROGRAMMING YOUR ST9120C’ (page 8).
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 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3
Monday to Friday
6:30am 8:30am 12:00pm 1:00pm 4:30pm 10:30pm
Saturday & Sunday
6:30am 9:30am 12:00pm 1:00pm 4:30pm 11:00pm
ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Your Personal Programme
The table below has been left blank for you to record your own personal programme.
Built-in Programme (Profile b)
ON 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3
Monday to Friday
6:30am 9:30am 12:00pm 1:00pm 4:30pm 11:00pm
Saturday & Sunday
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
6:30am 7:30am 12:00pm 12:00pm 5:00pm 10:00pm
Saturday & Sunday
8:30am 9:30am 12:00pm 1:00pm 5:30pm 10:30pm
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