FITTING THE PROGRAMMER
If surface wiring has been used, remove the knockout/insert from the
bottom of the programmer to accommodate it.
Loosen the two ‘captive’ retaining screws on the bottom of the Backplate.
Now fit the programmer to the Backplate, ensure the lugs on the Backplate
engage with the slots on the programmer .
Swing the bottom of the programmer into position ensuring that the
connection pins on the back of the unit locate into the terminal slots in the
backplate.
Tighten the two ‘captive’ retaining screws to fix the unit securely.
Then switch on the mains supply.
ENDVIEWOFSERVICEPLUSPROGRAMMER
UPON COMPLETION OF INSTALLATION PLEASE RESET THE PROGRAMMER, BEFORE SETTING THE
HEATING AND HOT WATER OPERATIONS.
RESETTING THE PROGRAMMER
On the ServicePlus press SET and CH buttons together:
Then release the buttons and the programmer will
return to preset factory settings.
The Preset factory settings are illustrated on page 2 of
the USER GUIDE.
SET
CH
The unit can now be programmed to suit the User’s requirements.
Please refer to the User’s Guide provided.
GENERAL INFORMATION
Before handing over the installation to the user, always ensure that the system responds correctly on
all control programmes and that other electrically operated
equipment and controls are correctly adjusted.
EXPLAIN HOW TO OPERATE THE CONTROLS AND HAND OVER THE USERS OPERATING INSTRUCTIONS TO THE
USER.
SPECIFICATION S21 - S27
Contact type: Micro dis-connection
Contact rating:3(1)Amps 230-240V AC
Power supply: 230-240V AC 50Hz
Operating Temperature range:0oC to 40oC
Double insulated.
Dirt protection: Normal situations.
Enclosure protection:IP30
Purpose of control:Electronic time switch
Independently mounted control for surface mounting.
Operating time limitation: Continuous
Type 1 Action
Battery Reserve:10 months continuous operation(minimum)
Case material:Thermoplastic, flame retardant
Page 4
Dimensions:150mm x 84mm x 29mm
Display: Liquid crystal
Clock:12 hour AM/PM
Display time adjustment:1Minute steps
Switched time adjustment: 10 Minute steps
Programme selection:Auto, On all day, On constant, Off
Operating periods per day: Three for HW, Three for CH (Separate daily programmes for S27)
Override:1 Hour Boost on Hot water
Instant advance on Central Heating
Backplate: Industry Standard Backplate
LEAFLET No P82506
ISSUE 1
Horstmann ServicePlus - Two Channel service interval Programmers
have been developed to facilitate compliance with the Gas Safety
(Installation and Use) Regulations 1998. The device is not intended
to replace the normal servicing regime already in operation, but is
intended to act as a supplementary aid to enabling compliance.
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON
AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE IEE WIRING REGULATIONS.
WARNING:ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION
FITTING THE BACKPLATE
Once the Backplate has been removed
from the packaging please ensure the
programmer is re-sealed to prevent
damage from dust, debris etc.
The Backplate should be fitted with
the wiring terminals located at the top
and in a position which allows a total
clearance of at least 50mm around the
programmer.
DIRECT WALL MOUNTING
Offer the plate to the wall in the position where the programmer is to be mounted, remembering that
the Backplate fits to the left hand end of the programmer. Mark the fixing positions through the slots
in the Backplate(Fixing centres 60.3mm), drill and plug the wall, then secure the plate in position. The
slots in the Backplate will compensate for any misalignment of the fixings.
WIRING BOX MOUNTING
The Backplate may be fitted directly on to a single gang steel flush wiring box complying with BS4662,
using two M3.5 screws. ServicePlus programmers are suitable for mounting on a flat surface only, they
must not be positioned on a surface mounted wall box or on unearthed metal surfaces.
ELECTRICAL CONNECTIONS
All necessary electrical connections should now be made. Flush wiring can enter from the rear through
the aperture in the Backplate. Surface wiring can only enter from beneath the programmer and must
be securely clamped.
The mains supply terminals are intended to be connected to the supply by means of fixed wiring.
The recommended cable sizes are 1.0mm
2
or 1.5mm2.
Page 1
NEW INSTALLATIONS
Example circuit diagrams for some typical installations are shown below. These diagrams are
schematic and should be used as a guide only.
Please ensure that all installations comply with the current IEE regulations.
For reasons of space and clarity not every system has been included and the diagrams have been
simplified, for instance some Earth connections have been omitted.
Other control components shown in the diagrams i.e. Valves, RoomStats etc are general
representations only. However the wiring detail can be applied to the corresponding models of most
manufactures e.g. Horstmann, Honeywell, Danfoss Randall, ACL Drayton etc.
Cylinder and Room Thermostat Key:
C = Common CALL = Call for heat or break on rise SAT = Satisfied on rise N = Neutral
1. Gravity Hot water with Pumped
Heating
2. Gravity Hot water with Pumped
Heating via RoomStat and
CylinderStat
3. Gravity Hot water with Pumped Heating
via RoomStat and CylinderStat including
Frost protection via double pole FrostStat
ELECTRICAL CONNECTIONS
ServicePlus programmers are double insulated and do not require an Earth connection but an Earth
connection block is provided on the Backplate for terminating any cable Earth conductors. Earth
continuity must be maintained and all bare Earth conductors must be sleeved. Ensure that no
conductors are left protruding outside the central space enclosed by the Backplate.
INTERNAL WIRING DIAGRAM S21 - S27
Your ServicePlus has an integral
connection which makes it only
suitable for mains voltage
applications. No additional linking
is required between terminals.
COMMISSIONING THE PROGRAMMER
Ensure all dust and debris has been cleared away from the work area before removing the
programmer from its packaging.
All ServicePlus programmers are suitable for GRAVITY HOT WATER or FULLY PUMPED systems.
On a FULLY PUMPED or CONTROLLED systems it is possible to programme independent time settings for
Hot water and Heating.
On GRAVITY or PARTIALLY CONTROLLED systems the Hot water and Heating follow a common time
setting. It is not usually possible to have Heating without Hot water.
Correct control of each type of system is ensured by a BLUECIRCUIT LINK located on the rear of the
programmer.
If the programmer is to control a GRAVITY HOTWATER system this link should be removed by simply
pulling it out of the back of the programmer. When used to control a FULLYPUMPED system the link
must remain in situ.
Page 2
4. Gravity Hot water with Pumped
Heating via RoomStat, CylinderStat
and Two Port Zone Valve (with
Changeover Auxiliary Switch) on Hot
Water circuit
6. Fully Pumped System using RoomStat
and Two (2 Port) Spring Return Zone Valve
with Auxiliary Switches
5. Fully Pumped Heating System using
RoomStat, CylinderStat and Three Port
Mid-Position Valve
7. Fully Pumped System using
RoomStat and CylinderStat and Two
(2 Port) Motorised Valve with Auxiliary
Switches
REAR VIEW OF SERVICEPLUS PROGRAMMER
5
1 - RATINGS LABEL
2 - BATTERY
3 - CONNECTOR PINS
4 - PRODUCTION DATE LABEL
5 - BLUE CIRCUIT LINK
BATTERY RESERVE
The Battery must be commissioned prior to fitting the control to the Backplate.
This is achieved by the means of a COMMISSIONING STRIP situated on the back of the unit. Pull out the
battery commissioning strip at the back of the programmer and re-insert the Battery, the reserve is
now activated. When the programmer is running on battery reserve the clock display will disappear.
This is to prolong the life of the battery.
Page 3
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