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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
1. Gravity Hot water with Pumped
2. Gravity Hot water with Pumped
Heating via RoomStat and
Heating
CylinderStat
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
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SAT = Satisfied on rise N = Neutral
3. Gravity Hot water with Pumped Heating
via RoomStat and CylinderStat including
Frost protection via double pole FrostStat
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
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 BLUE CIRCUIT LINK located on the rear of the
programmer.
If the programmer is to control a GRAVITY HOT WATER system this link should be removed by simply
pulling it out of the back of the programmer. When used to control a FULLY PUMPED system the link
must remain in situ.
REAR VIEW OF SERVICEPLUS PROGRAMMER
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.
5
1 - RATINGS LABEL
2 - BATTERY
3 - CONNECTOR PINS
4 - PRODUCTION DATE LABEL
5 - BLUE CIRCUIT LINK
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