Worcester GREENSTAR 25 HE User manual

2 1
HEATING ON
SIGNAL
LEARN
MODE
OVERRIDE
DIGISTAT OPTIMISER PROGRAMMABLE 7 DAY
ROOM THERMOSTAT SYSTEM
Radio frequency controlled programmable room thermostat
FOR GREENSTAR 25 HE and GREENSTAR 30 HE MODELS
INSTRUCTION MANUAL
OPERATING AND INSTALLATION
Hol Man Auto Day
Digistat Optimiser

WORCESTER, BOSCH GROUP:
TECHNICAL 08705 266241
SERVICE 08547 256206
SPARES 01905 752571
LITERATURE 01905 752556
TRAINING 01905 752526
SALES 01905 752640
WEBSITE worcester-bosch.co.uk
SYMBOLS
Domestic Hot Water
Radio Frequency (RF) Transmitter
PLEASE READ THESE INSTRUCTIONS
CAREFULLY BEFORE STARTING
THESE INSTRUCTIONS ARE APPLICABLE TO
THE WORCESTER BOSCH MODEL(S) STAT-
ED ON THE FRONT COVER OF THIS MANUAL
ONLY AND MUST NOT BE USED WITH ANY
OTHER MAKE OR MODEL
THESE INSTRUCTIONS APPLY IN THE UK
ONLY AND SHOULD BE FOLLOWED EXCEPT
FOR ANY STATUTORY OBLIGATION
IF YOU ARE IN ANY DOUBT CONTACT
WORCESTER, BOSCH GROUP TECHNICAL
HELPLINE
THIS ACCESSORY MUST BE FITTED BY A
COMPETENT PERSON. FAILURE TO COMPLY
COULD LEAD TO PROSECUTION.
LEAVE THESE INSTRUCTIONS WITH THE
USER OR AT THE APPLIANCE.
ABBREVIATIONS
CH = Central Heating
DHW = Domestic Hot Water
RF = Radio Frequency
DLS = Daylight Saving
BST = British Summer Time
GMT = Greenwich Mean Time
C = Celsius (Centigrade)
IP = Ingress Protection
V = Volt
m = metre
mA = milliAmpere
DEFINITIONS (DLS/BST)
Summer period begins: Last Sunday in March at
1:00 am GMT (Clocks are put forward by 1 hour)
Summer period ends: Last Sunday in October at
2:00 am BST (Clocks put back 1 hour)

TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
PROGRAMMABLE THERMOSTATS . . . . . . . . . . . . . . . . . . .3
DIGISTAT OPTIMISER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
PRE-PROGRAMMED SETTINGS . . . . . . . . . . . . . . . . . . . . .5
PRQGRAMMABLE SETTINGS . . . . . . . . . . . . . . . . . . . . . . . .5
ADJUSTING TIMES AND TEMPERATURES . . . . . . . .5
USER OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
OPERATIONAL CONTROLS . . . . . . . . . . . . . . . . . . . . . . . .11
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
DIGISTAT OPTIMISER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
SETTING THE RF LINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
DIGISTAT OPTIMISER INSTALLER OPTIONS . . . . . . . . . .15
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
CONTENTS
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)
OPERATING & INSTALLATION
INSTRUCTIONS 1

EC Directives:
European Union Law Directive 2000/84/EC
Low Voltage Directive (2006/95/EC)
Electro-Magnetic Compatibility Directive (89/336/EEC)
EC Marking Directive (93/68/EEC)
STANDARD PACKAGE:
Programmable / RF receiver
Remote RF transmitter
Screws (x2)
Wall Plugs (x2)
Instructions
Batteries (x2) AA Alkaline
DESCRIPTION UNITS Receiver Digistat Transmitter
Dimensions mm -- 137 x 96.5 x 31.3
Electrical supply V24 3
Radio frequency MHz 433 433
Radio signal range The range may be affected by the composition / density and
number of walls between the Digistat RF and receiver.
30 metres typically, through two internal plasterboard walls and
a ceiling.
26 metres typically, through three internal plasterboard walls
and a ceiling.
17 metres typically, through two internal plasterboard walls a
ceiling and one external cavity wall.
These distances are provided for guidance only, many factors
can affect the range of the transmitter, including metal
pipework, appliances and even furniture.
Temperature range °C 5 to 32 5 to 32
Ambient operating temperature °C 0 to +50 0 to +40
Ambient storage temperature °C -- -20 to +55
Humidity operating range % non condensing
up to 45°C
30 to 95 25 to 90
Class of operation II II
Degrees of protection IP 24 30
Accuracy at 25°C sec/day -- --
Battery life (with alkaline batteries) years N/A approx. 2
Battery back up time and date years min. -- 10
Shortest switching period minutes -- 1
Hot water pre-heat settings number -- --
Central heating settings number -- 6
Hot water and Central heating programs days -- 7
OPERATING & INSTALLATION
INSTRUCTIONS
2
TECHNICAL DATA
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

What is a programmable room thermostat?
A programmable room thermostat is both a
programmer and a room thermostat.
A programmer allows you to set ‘On’ and ‘Off’
time periods to suit your own lifestyle.
A room thermostat works by sensing the air
temperature, switching on the heating when the
air temperature falls below the thermostat
setting, and switching it off once this set
temperature has been reached.
A programmable room thermostat lets you
choose what times you want the heating to be
on, and what temperature it should reach.
It will allow you to select different temperatures
in your home at different times of the day (and
days of the week) to meet your particular needs.
Turning a programmable room thermostat to a
higher setting will not make the room heat up any
faster. How quickly the room heats up depends
on the design of the heating system, for example,
the size of boiler and radiators.
Neither does the setting affect how quickly the
room cools down.
Turning a programmable room thermostat to a
lower setting will result in the room being con-
trolled at a lower temperature, and saves energy.
The way to set and use your programmable room
thermostat is to find the lowest temperature
settings that you are comfortable with at the
different times you have chosen, and then leave it
alone to do its job.
The best way is to set low temperatures first, say
18°C, and then turn them up by one degree each
day until you are comfortable with the tempera-
tures.
You won’t have to adjust the thermostat further.
Any adjustments above these settings will waste
energy.
If your heating system is a boiler with radiators,
there will usually be only one programmable room
thermostat to control the whole house.
But you can have different temperatures in indi-
vidual rooms by installing thermostatic radiator
valves (TRVs) on individual radiators.
If you don’t have TRVs, you should choose a
temperature that is reasonable for the whole
house. If you do have TRVs, you can choose a
slightly higher setting to make sure that even the
coldest room is comfortable, then prevent any
overheating in other rooms by adjusting the
TRVs.
Programmable room thermostats need a free flow
of air to sense the temperature, so they must not
be covered by curtains or blocked by furniture.
Nearby fires, televisions, wall or table lamps may
prevent the thermostat from working properly.
GENERAL INFORMATION
PROGRAMMABLE THERMOSTATS
OPERATING & INSTALLATION
INSTRUCTIONS 3
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

DIGISTAT OPTIMISER
OPERATING CONTROLS
Digistat Optimiser
Days Temperature
see note
+ or - buttons for
setting adjustment
Clock mode
Right hand button > moves the
pointer to the right, selects and
accepts changes
Day indicator
Flame shows
when calling
for heat
Left hand button < moves
pointer to the left for selection
Holiday, Manual,
Auto, Day mode
Time
mode
indicator
Clock Setting
The Digistat Optimising Programmer is fitted with a real-time clock, which is pre-set at the factory.
You will not have to set the time.
A special feature of this real-time clock is to automatically update the time during the summer/winter time
change removing the need to manually alter the clock.
General Operation
With the unit in Auto mode (the small arrow to bottom of screen will point to Auto) the temperature can be
changed for a short time by using the + or - buttons. Changing the temperature in this way will keep the
Programmer set to your new temperature until the next pre-programmed event (at which time it will revert
to programmed temperature). The temperature you are setting will flash on the screen. Once temperature
is set, the unit will revert to showing the current temperature. The indicator will show on the screen if the
heating is turned on.
NOTE: The temperature displayed is actual room temperature unless adjusting the + or - button
when the set temperature is displayed. Once adjustment is complete and after a 5 second
delay the display will return to the actual room temperature.
Digistat Optimising Programmer
The Digistat Optimising Programmer has factory set programs for ON/OFF periods for central heating
which are described on the following pages.
These factory installed settings can be used without any further programming.
OPERATING & INSTALLATION
INSTRUCTIONS
4DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

The Digistat Optimising Programmer
This is a programmable thermostat 5-2 Day / 7
Day product. 5–2 day allows you to set a program
for weekdays and a program for the weekend.
Full 7-day functionality allows you to set a different
program for every day of the week.
Each program type allows you to set 6 time and
temperature events.
Pre-set Program 1
The following default settings are pre-programmed
for your convenience:
Monday - Friday
DIGISTAT OPTIMISER
PRE-PROGRAMMED SETTINGS
Event 1 2 3 4 5 6
Time 06:30 08:30 12:00 14:00 16:30 22:30
Temp. 20 16 16 16 21 7
Event 1 2 3 4 5 6
Time 07:00 09:00 12:00 14:00 16:00 23:30
Temp. 20 18 21 18 21 7
As shown, at 06:30 , the heating will come on to
raise the temperature to 20°C. At 08:30, the tem-
perature set point is dropped from 20°C down
to16°C, it stays at 16°C throughout the day, until
16:30 when the temperature increases to 21°C.
The temperature then drops down to a night-set-
back temperature of 7°C until 06:30 when the
cycle repeats for the next day. (Monday to Friday)
For changes to weekend setting see below.
Saturday - Sunday
As shown, at 07:00, the heating will come on to
raise the temperature to 20°C. At 09:00, the tem-
perature set point is dropped from 20°C down
to18°C, it stays at 18°C until 12:00 when the
heating comes on to raise the temperature to
21°C. The temperature stays at 21C until 14:00
when it drops down to 18°C.
At 16:30 the heating comes on to raise the tem-
perature to 21°C where it stays until 23:00 when
the temperature then drops down to a night-set-
back temperature of 7°C until 07:00 when the
cycle repeats for the next day. (Saturday and
Sunday) or changes to weekday settings see
above.
Digistat Optimising Programmer -
5-2 Day operation:
1. With the product
operating as normal
in Auto mode press
> once then press +
button until the
display is flashing as
shows.
2. Press > once, the
display will be as
shown. The time will
be flashing, use + or
- buttons to adjust
1st time as required.
3. Once time has
been set, press >
and use + or - but-
ton to adjust
required tempera-
ture (shown flash-
ing).
Press > to confirm
and move to next
time and tempera-
ture periods to be
adjusted confirm
changes by pressing
> button. (max 6
periods).
4. Once the last
weekday tempera-
ture has been set
press > once to con-
firm and allow adjust-
ment of the weekend
program. Use + and
– buttons and > but-
ton to set the 6 peri-
ods for the weekend
program.
5. Once the final
temperature has
been set press > to
confirm. T
o exit press
< or > until you
return to auto mode
with bottom arrow
pointing at Auto.
(* small 1 in lower half of
screen shows time period
is being set e.g. 1=1st
period, 2 = 2nd period etc)
PROGRAMMABLE SETTINGS
ADJUSTING TIMES & TEMPERATURES
OPERATING & INSTALLATION
INSTRUCTIONS 5
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

To change temperature for a short period
(Override):
1. Press + or -
buttons to adjust set
temperature.
Set temperature
shown flashing
2. After 5 seconds
will start controlling
at selected set point
but displays actual
room temperature.
Two chevrons
indicates override
mode.
3. To exit override
press > once or
wait until next
change in the
pre-set program.
Digistat Optimising Programmer -
7-Day operation:
1. With the product
operating as normal in
the Auto mode press
once and then press
the + button until the
display is flashing and
shows.
2. Press the once, the
display will be as
shown. The
time will be flashing,
use the + or - buttons
to adjust the 1st time
as required.
3. Once time has
been set, press > and
use + or - buttons to
adjust required
temperature.
Repeat above steps 2-
3 until the 6 periods
have been set for
Monday
4. Once Monday has
been set, press once.
Repeat steps 2-3 until
all 7 days of the week
have been set.
5. Once the final tem-
perature has been set
press the to confirm
settings. To exit press
or until you return to
auto mode with the
bottom arrow pointing
at Auto.
(* small 1 in lower half of screen
shows time period is being set
e.g. 1=1st period, 2 = 2nd period etc)
1
To set a constant room temperature
(Manual mode):
1. Press > once,
the display shows
temperature
flashing (eg. 20°C)
2. Press + or - but-
tons to adjust the
temperature as
required. The tem-
perature will stop
flashing after 5 sec-
onds and start con-
trolling at this
temperature.
3. Press > once, to return to auto mode.
PROGRAMMABLE SETTINGS
ADJUSTING TIMES & TEMPERATURES
OPERATING & INSTALLATION
INSTRUCTIONS
6DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

To set holiday mode:
1. Press < twice,
the display shows
time flashing
Time periods
between 1 to
23(Hr) hours and
1 to 199(d) days
can be set.
2. Press + or -
buttons to adjust
the count down
time as required.
Press > once to
confirm, the dis-
play will show tem-
perature
flashing.
3. Press + or -
buttons to adjust
temperature and
press > to start
holiday count
down time.
Alternatively after
10 seconds the
temperature will
stop flashing and
holiday count
down time will start.
Display shows count
down time and
ambient room
temperature.
4. To exit the
holiday mode
press the < or >
once, to return to
auto.
To switch the thermostat OFF:
Press the + and – simultaneously for 5 seconds until
the OFF is displayed.
The thermostat and heating system will now be OFF
unless the temperature in the controlled space falls
below 7°C, the frost protection set point.
Please note this does not affect the operation of the
domestic hot water where provided.
To switch ON the thermostat, press any key to return
to auto mode.
PROGRAMMABLE SETTINGS
ADJUSTING TIMES & TEMPERATURES
OPERATING & INSTALLATION
INSTRUCTIONS 7
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

DIGISTAT OPTIMISER
USER OPTIONS
User Options
User Options (shown in table below) can be
accessed from Auto or Man by pressing < and >
simultaneously for 3 seconds.
Once you have
accessed the User
Options Menu press
> to scroll through
selectable options.
The settings for each
option can be
changed by pressing
+ or - as required.
Pressing > accepts the change and moves to the
next option.
NOTE: To exit User Options press < and >
simultaneously for 3 seconds.
Alternatively, not press-
ing any buttons for 2
minutes will cause the
Programmer to return
to Auto.
This figure opposite
shows option “01 24”
(24 hour clock).
Only options that have
been accepted by
pressing > will be changed.
Option Description of Option Min Max Default
01 Change clock 12h/24h 12 24 24
02 Change pre-set program 1 3 1
03 Change number of program
events per day
2,4 or 6 6
04 Switch on/off daylight saving
time change
On Off On
05 Adjust date and time Factory set
06 Change temperature offset C -5 5 0
07 Restore pre-set program On Off Off
08 Disable OFF function On Off On
09 Access protection lockOn Off Off
Option 01 Change from 24hr to 12hr clock.
Enter user options, select option 01 and use + and
– keys to select desired option, 12 = 12hr and 24 =
24hr. Press > to accept change.
Option 02 Change to program 1, 2 or 3.
Enter user options, select option 02 and use + and
– keys to select desired program 1, 2 or 3.
1 = program 1, 2 = program 2 and 3 = program 3.
Press > to accept change.
Preset programs 2 and 3 are shown below:
Pre-set Program 2 (Home for lunch)
Monday to Friday
At 06:30 the heating raises the temperature to 21°C.
At 08:30, the temperature set point is dropped to
16°C, until 12:00 when the heating raises the
temperature to 21°C. The temperature stays at 21°C
until 14:00 when it drops to 16°C. At 16:30 the heat-
ing raises the temperature to 21°C where it stays
until 22:30 when the temperature drops down to a
setback temperature of 10°C until 06:30 when the
cycle repeats the next day.
Saturday to Sunday
At 7:00, the heating raises the temperature to 21°C.
At 9:00, the temperature set point is dropped to
18°C, it stays at 18°C until12:00 when the heating
raises the temperature to 21°C.
The temperature stays at 21°C until 14:00 when it
drops down to 18°C. At 16:30 the heating raises the
temperature to 21°C where it stays until 23:00 when
the temperature drops down to a setback tempera-
ture of 10°C until 07:00 when the cycle repeats the
next day.
Event 1 2 3 4 5 6
Time 7:00 9:00 12:00 14:00 16:30 23:00
Temperature 21 18 21 18 21 16
Event 1 2 3 4 5 6
Time 6:30 8:30 12:00 14:00 16:30 22:30
Temperature 21 16 21 16 21 10
OPERATING & INSTALLATION
INSTRUCTIONS
8DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

Pre-set Program 3 (Home Worker)
Monday to Friday
As you can see, at 06:00, the heating will come on to
raise the temperature to 21°C.
At 08:30, the temperature set point is dropped to
19°C, it stays at 19°C until 12:00 when the heating
comes on to raise the temperature to 21°C. The tem-
perature stays at 21°C until 14:00 when it drops to
19°C. At 17:30 the heating comes on to raise the
temperature to 21°C where it stays until 22:30 when
the temperature drops down to a setback tempera-
ture of 16°C until 06:00 when the cycle repeats the
next day.
Saturday to Sunday
As you can see, at 7:00, the heating will come on to
raise the temperature to 21°C.
At 9:00, the temperature set point is dropped to
18°C, it stays at 18°C until12:00 when the heating
comes on to raise the temperature to 21°C. The tem-
perature stays at 21°C until 14:00 when it drops
down to 18°C. At 16:30 the heating comes on to
raise the temperature to 21°C where it stays until
23:00 when the temperature drops down to a set-
back temperature of 16°C until 07:00 when the cycle
repeats the next day.
Option 03 How to change the number of pro-
gram events per day.
Enter user options, select option 03 and use + and –
keys to select option. 2 = 2 time / temp events per
day, 4 = 4 time / temp events per day and 6 = 6 time
/ temp events per day. Press > to accept change.
Option 04 How to switch on/off the automatic
summer / winter time change.
Twice a year the actual time is automatically changed
to keep it in line with the summer / winter time
change. Default setting is On.
If you wish to disable / enable this feature enter user
options, select option 04 and press – or + key to dis-
play Off or On as desired. Press > to accept change.
Date and time setting.
The DT10RF Optimising Programmer comes with a
pre-set clock, which also automatically adjusts for
daylight saving time changes. It is activated automati-
cally on 1st installation. There should be no need to
change these settings, however, should you wish to,
it can be done in Option 05.
Option 05 How to adjust date and time.
Enter user options,
select option 05
To change the year
press > once
To change the month
press > again
To change the day
press > again
To change the time
press > again
Once you have select-
ed your required dis-
play, to adjust press +
or - and > to accept
change.
To select option 06
press > until option
06 display is shown
Event 1 2 3 4 5 6
Time 6:00 8:30 12:00 14:00 17:30 22:30
Temperature 21 19 21 19 21 16
Event 1 2 3 4 5 6
Time 7:00 9:00 12:00 14:00 16:30 22:00
Temperature 21 18 21 18 21 16
DIGISTAT OPTIMISER
USER OPTIONS
OPERATING & INSTALLATION
INSTRUCTIONS 9
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

NOTE: Option 5 must be completed before
attempting option 6
Option 06 How to change temperature offset.
The temperature displayed on the thermostat may not
match that of other temperature measuring devices in
the controlled space, because of its location.
The displayed temperature may be offset to bring it in
line with other devices.
To adjust the temperature, enter the user options,
select option 06.
The temperature may be offset by +/- 5 degrees by
pressing the + and – keys. Press > to accept the
desired change.
Option 07 How to restore the built in time
temperature programs.
NOTE: Enabling this function will lose any user
changes to the preset programs.
Enter user options, select option 07 and use + and –
keys to select desired option. Off = current programs
retained. On = restore factory program settings.
Press > to select the desired change.
The option 07 display automatically reverts back to
off.
Option 08 How to disable the OFF function.
To disable the OFF function, enter user options,
select option 08 and use + or – keys to select Off.
Press > to accept change.
It is now not possible to switch the Digistat OFF
using the + and - keys as previously described.
To enable the OFF function return to option 08 and
select ON. Press > to accept change.
Option 09 How to lock the key pad -
Access Protection Lock.
The access protection lock allows you to lock the
Digistat Optimiser so that it cannot have any adjust-
ments.
The default is OFF mode allowing you to adjust the
Digistat.
To Lock the Digistat settings enter the User Options
Menu Option 09 and select On and press > to
accept.
Once the User Options Menu is exited all buttons will
be locked.
To switch off the Protection Lock enter the User
Menu and change to OFF. Press > to accept.
Once the User Menu is exited all buttons will be free
to adjust.
NOTE: To exit User Options press < and >
simultaneously for 3 seconds.
Special Note:
The following only applies when the Intelligent
delayed start feature is enabled.
Ask your installer for details
When the delay period is operating indicated by the
flame symbol flashing, pressing any button returns
the DT10RF Programmer/Optimising Programmer to
auto mode allowing normal button operation until the
next time/temperature event, when it will resume the
delay start mode or follows the Holiday, Manual,
Override or Off modes as selected.
Changes to the installer options and pre-set pro-
grammes must be made with the flame symbol not
flashing
What is Intelligent delayed start.
The Intelligent Delayed Start is an energy saving
feature which automatically reduces the warm up
time for the heating system.
As the weather becomes milder, Intelligent Start will
delay the heating start times so that the fuel is not
wasted bringing the room up to temperature earlier
than necessary.
NOTE: See page 15 for further information and set
up details.
DIGISTAT OPTIMISER
USER OPTIONS
OPERATING & INSTALLATION
INSTRUCTIONS
10
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

2 1
HEATING ON
SIGNAL
LEARN
MODE
OVERRIDE
RECEIVER
OPERATING CONTROLS
OPERATING & INSTALLATION
INSTRUCTIONS 11
Learn mode buttons.
Pressing these buttons
together will cause the
receiver to establish an
RF link with the trans-
mitter.
Heating demand light
green LED
The green LED will
be ON when there is
demand for heat.
OVERRIDE button.
The heating can be
manually switched
ON or OFF
Transmitter signal light
red LED.
The red LED will flash
for approximately 7 sec-
ond every 5 minutes.
This confirms the RF
signal is being received.
Small Receiver for:
24i Junior, 28i Junior
and Si Mk II
The heating can be switched ON or OFF at this unit,
overriding the room Programmer.
Pressing OVERRIDE will change the state of the
appliance, turning it OFF if it is ON or ON is it is
OFF.
Small Receiver
The Receiver provides the link with the room
Programmer /Thermostat.
The Receiver indicates when heat is demanded with
a green light and confirms the RF link with a flashing
red light.
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

RECEIVER
INSTALLATION
DANGER: 230 VOLTS
DO NOT TOUCH THE
ELECTRICAL COMPONENTS
OR CIRCUITS
CAUTION:
ISOLATE THE MAINS ELECTRICITY
SUPPLY BEFORE STARTING ANY
WORK AND OBSERVE ALL RELEVANT
SAFETY PRECAUTIONS
OBSERVE ELECTRO-STATIC
DISCHARGE PRECAUTIONS.
DO NOT TOUCH THE PCB CIRCUIT
OPERATING & INSTALLATION
INSTRUCTIONS
12
NOTE: THIS ACCESSORY MUST BE FITTED
BY A COMPETENT PERSON.
FAILURE TO COMPLY COULD LEAD
TO PROSECUTION.
1. Remove the blanking plate from the fascia by
gently pulling the plate towards you to release
the tabs.
2. Present the receiver up to the fascia, plug the
connecter onto the PCB as shown in the figure
below. Ensure the connector is pushed firmly
home.
3. Introduce the receiver tabs into the slots in the
fascia.
Ensure that the lead is not trapped and then
push the receiver into place to secure.
ST5 Receiver connection
Printed Circuit Board (PCB)
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

DIGISTAT OPTIMISER
INSTALLATION
1. Remove the front cover using a flat screwdriver
and separate from back plate.
2. Fix the back plate directly onto the wall using
suitable wall plugs and screws.
3. Replace the front cover by locating in position
and pushing fully onto the back cover.
OPERATING & INSTALLATION
INSTRUCTIONS 13
Location and mounting Mounting the digistat
Location
The Digistat is a radio frequency device and for
best performance should be mounted in an open
space, no closer than 30cm to any metal objects,
including wall boxes.
Mount on a wall, which is not subject to direct
sunlight or draughts. Preferably mount on an inside
wall about 1.5m (5ft) above the floor, away from
the direct influence of radiators or other appliances
giving off heat.
DIGISTAT OPTIMISER
INSTALLATION
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

DIGISTAT / RECEIVER
SETTING UP THE RF LINK
OPERATING & INSTALLATION
INSTRUCTIONS
14
7. The Digistat is now installed and will automatically
start to control the room temperature according to
the pre-set program 1 as shown on page 5.
The display shows the correct time and date
which is automatically set together with the actual
room temperature.
HolMan Auto Day
Digistat +2RF
BOILER
The range may be affected by
composition, density and number of walls
between the Programmer and Receiver
Radio Signal Range:
refer to Technical Data page
4. Remove the battery cover using a coin.
5. Install the 2 AA batteries provided.
6. Replace battery cover.
Digistat Optimiser
Digistat Optimiser Digistat Optimiser
Digistat Optimiser
DIGISTAT OPTIMISER
INSTALLATION
Receiver set up:
To set up the radio frequency (RF) link, the receiver
must be put into the LEARN MODE.
To set up the RF link, proceed as follows:
1. Press the OVERRIDE button until the green light
is ON, the appliance is now running in central
heating mode.
2. To enter the LEARN MODE press and hold both
buttons 1 and 2.
The red light should flash for two seconds and
then go out, this signifies that the receiver is in the
LEARN MODE, release both buttons.
3. The red and green lights should both be ON.
Transmitter set up:
1. Take the Digistat Programmer unit and stand
approximately two metres away from the boiler.
2. Remove the battery cover and fit the batteries.
The red light on the eceiver should flash for seven
seconds, this confirms that the RF signal is being
sent and received. After seven seconds the red
light will stop flashing and the green light will
come ON.
The Digistat Programmer is now linked to the
receiver on the boiler.
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

Installer Options
If you wish to change any of the Installer Options as
shown below, enter the Installer Option Menu from
Auto mode by pressing < and + simultaneously for 5
seconds.
Pressing < and + again for 5 seconds will exit the
Menu and return to Auto mode.
Once the Installer Options screen has been selected,
the < and > buttons allow you to scroll through the
Menu (shown below). The + and - allow you to
change values. Once a value has been changed
pressing > before exiting the Menu will save the new
setting. (The figure below shows Option 02 OFF).
Special Note:
If the Intelligent delayed start feature is
enabled, (Off changed to On in Installer option
06), please inform the end user of this feature.
The following special note has been added to
the user instruction to explain the adjustment
requirement:
When the delay period is operating, indicated by the
flame symbol flashing, pressing any button returns
the Digistat to auto mode allowing normal button
operation until the next time/ temperature event,
when it will resume the delay start mode or follows
the Holiday, Manual, Override or Off modes as
selected.
Changes to the installer options and pre-set
programmes must be made with the flame symbol
NOT flashing.
Installer
Options
Function Select
Option
Default
02 Freeze protection On Off On
04 Low Set Point C 5High
Limit
5
05 High Set Point C Low
Limit
32 32
06 Delayed Start (Energy
saving feature
On Off Off
10 System protection On Off Off
11 System protection
time (Mins)
1 5 3
Option 02 - Freeze Protection
Freeze protection will switch on the heating if the
room temperature falls to 5°C and will then control
the temperature at 7°C even if the Digistat is in OFF
mode.
The Freeze Protection default in ON.
To switch off the Freeze Protection mode enter the
Installer Options Menu (Refer to Installer Options 02)
and change to OFF. Press > to accept.
Option 04 & 05 - Low and High Limit set points.
The user temperature set points defaults are High
32°C and Low 5°C, to change these limits enter the
Installer Options Menu
(Refer to Installer Options 04 & 05).
Option 06 - Intelligent Delayed Start
(Energy saving feature).
The Intelligent Delayed Start is an energy saving fea-
ture which automatically reduces the warm up time
for the heating system.
If enabled, the start time should be set an hour earli-
er than the time you want the property to reach the
set temperature.
Intelligent Start will delay that start time, by an
amount that it has calculated based on the actual
and set temperature.
As the weather becomes milder, the start time is
delayed, so that fuel is not wasted bringing the room
up to temperature earlier than necessary.
The Digistat calculates approximately 10 minutes to
raise the temperature by 1°C, up to a maximum of
6°C.
Note:
Intelligent Delayed Start only applies in Auto mode.
Intelligent Delayed Start default is in OFF mode.
To switch ON Intelligent Delayed Start enter the
Installer Options Menu (see Installer Options 06).
Note:
The Intelligent Delayed start option is not suitable
for underfloor application.
Ensure Installer option 06 is set to OFF before final
commissioning for underfloor application.
DIGISTAT OPTIMISER
INSTALLER OPTIONS
OPERATING & INSTALLATION
INSTRUCTIONS 15
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

Option 10 - System Protection
In some heating systems there may be a requirement
to protect the system by operating it once a day, for a
given period.
If system protection is selected the system will be
operated for a period as shown in system protection
time (mins).
System protection time is every day at 10.00am.
System protection default is OFF.
To enable the system protection mode enter the
Installer Options Menu (Refer to Installer Option 10).
Option 11 - System Protection time (mins).
System protection time can be set between 1 and 5
minutes (default 3 minutes).
To change this once a day on time enter the Installer
Options Menu (Refer to Installer Option 11).
How do I know when to change the batteries.
When the batteries start to run low a battery icon
will flash in the display, to indicate “low battery” dur-
ing this time the Digistat will function normally.
Please replace with 2 x 1.5V (AA) Alkaline batteries.
When the battery icon alone is shown in the display,
the batteries are completely exhausted and the
Digistat will cease to function. Re-activate by
replacing the batteries. The RF link will automatically
be re-established.
How to replace the batteries
Remove the battery cover using a coin. Replace the
spent batteries with 2 x 1.5V (AA) Alkaline batteries
ensuring correct orientation. Replace the battery
cover pressing fully home.
Digistat Optimiser
Digistat Optimiser Digistat Optimiser
Digistat Optimiser
DIGISTAT OPTIMISER
INSTALLER OPTIONS
OPERATING & INSTALLATION
INSTRUCTIONS
16 DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

Maintenance:
The Transmitter requires no maintenance.
The outer casing can be wiped clean using a dry
cloth. DO NOT use polish or detergents.
These units can not be serviced.
Should the existing unit fail to function correctly,
check:
4RF signal link is set up
4Transmitter batteries are the correct type, fitted
correctly and are not exhausted.
Fit new batteries if in doubt.
Hol Man Auto Day
Digistat Optimiser
Small Receiver
Part Number: 8 716 105 129 0
DIGISTAT / DT10RF RECEIVER
MAINTENANCE
Digistat Optimiser Programmer
Part number 8 716 114 462 0
OPERATING & INSTALLATION
INSTRUCTIONS 17
2 1
HEATING ON
SIGNAL
LEARN
MODE
OVERRIDE
DIGISTAT OPTIMISER PROGRAMMER
7 DAY ROOM THERMOSTAT SYSTEM
716 114 519a (09.07)

OPERATING AND
INSTALLATION
INSTRUCTIONS
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. [phone] Fax. [phone]
www.worcester-bosch.co.uk
Worcester Bosch Group is a trading name of BBT Thermotechnology UK Ltd.
8 716 114 519a (09.07) 06515049001
CONTACT INFORMATION
WORCESTER, BOSCH GROUP:
TECHNICAL: 08705 266241
SERVICE: 08457 256206
SPARES: 01905 752571
LITERATURE: 01905 752556
TRAINING: 01905 752526
SALES: 01905 752640
WEBSITE: www.worcester-bosch.co.uk