Horstmann ServicePlus S21 User Operating Instructions Manual page 2

The ServicePlus S21 and S21R Programmer
The simple instructions contained in this user guide are designed to help with the
11
3
9
2
programming and operation of the unit.
1
SET indicator - RUN is the normal position
2
Time of day
3
Switch period symbol
4
SET button
5
Hot Water BOOST or adjust (-) button
6
Central Heating ADVANCE or adjust (+) button
7
Hot Water (HW) programme select button or ENTER button
8
Central Heating (CH) programme select button
9
Hot Water ON indicator
10 Central Heating ON indicator
11 SET positions
12 PROGRAMME positions
13 BOOST symbol
14 ADVANCE symbol
15 AM/PM symbol
16 PROGRAMME indicators
1 15 2
4 5 6 7
16
12
13
14
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8