Horstmann ServicePlus S21 User Operating Instructions Manual
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Horstmann ServicePlus S21 User Operating Instructions Manual

Two channel central heating and hot water programmer
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ServicePlus S21 and S21R
User Operating Instructions
Two Channel Central Heating and Hot Water Programmer
The Horstmann ServicePlus S21/S21R is a 24 hour programmer allowing
independent timing of hot water and central heating with up to
3 ON/OFF settings per 24 hours and a hot water boost button
and central heating advance override.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
Additionally, the ServicePlus programmer gives an advance warning
of the annual boiler safety check due date.
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Summary of Contents for Horstmann ServicePlus S21

  • Page 1 User Operating Instructions Two Channel Central Heating and Hot Water Programmer The Horstmann ServicePlus S21/S21R is a 24 hour programmer allowing independent timing of hot water and central heating with up to 3 ON/OFF settings per 24 hours and a hot water boost button and central heating advance override.
  • Page 2 The ServicePlus S21 and S21R Programmer The simple instructions contained in this user guide are designed to help with the programming and operation of the unit. 1 15 SET indicator - RUN is the normal position Time of day Switch period symbol SET button Hot Water BOOST or adjust (-) button Central Heating ADVANCE or adjust (+) button...

  • Page 3: Manual Overrides

    Fully Pumped or gravity System The installer will have set the programmer to suit the installed system. This is normally a Fully Pumped system which will allow independent control of the central heating and hot water, however on an old Gravity system the central heating and hot water are linked so that it is not possible to use the central heating independently.
  • Page 4 Channel Override Facilities With the ServicePlus S21/S21R programmer operating in the normal running mode it is possible to alter the functionality of the programme on each individual channel by means of the CH and HW buttons. The options include; aUTO - Programme follows all programmed ‘ON’...

  • Page 5: Setting The Time Of Day

    Setting the Time of day Press the SeT Press the SeT button until Use PLUS and button until    SeT indicator is MINUS buttons SeT indicator Press eNTeR to adjust time is next to RUN next to CLOCK position position 12:00...

  • Page 6: Resetting Programmer

    Resetting the Programmer Electronic equipment can in some circumstances be affected by electrical interference. If the programmer’s display becomes frozen or scrambled; or if you wish to revert back to the default time settings please reset by pressing the SET and CH buttons together as shown below.
  • Page 7 What is a programmer? ... an explantion for householders. 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.
  • Page 8 Email: sales@horstmann.co.uk Website: www.horstmann.co.uk Horstmann Controls Limited, Bristol BS4 1UP Leaflet number P82512 Issue 2...

This manual is also suitable for:

Serviceplus s21r

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