Horstmann CentaurPlus C21 - Manual Overrides and Functions; Boost Function for Hot Water; Advance Function for Central Heating

3
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 current IEE regulations.
For reasons of space and clarity not every system has been included and the diagrams
have been simplified - for example some Earth connections have been omitted.
Other control components shown in the diagrams, i.e. Valves, Room Stats etc are general
representations only. However the wiring detail can be applied to the corresponding
models of most manufacturers, for example 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.
6. Fully Pumped System using Room Stat and
Two (2 Port) Spring Return Zone Valves with
Auxiliary Switches
4. Gravity Hot Water with Pumped Heating
via Room Stat, Cylinder Stat and Two Port
Zone Valve ( with Changeover Auxiliary
Switch) on Hot Water circuit
7. Fully Pumped System using Room Stat and
Two (2 Port) Motorised Valves with Auxiliary
Switches
5. Fully Pumped Heating System using
Room Stat, Cylinder Stat and Three Port Mid-
position Valve
3. Gravity Hot Water with Pumped Heating
via Room Stat and Cylinder Stat including
Frost protection via double pole FrostStat
2. Gravity Hot Water with Pumped
Heating via Room Stat and Cylinder Stat
1. Gravity Hot Water with Pumped
Heating