EHC SLIMJIM - Control Wiring Diagrams; S Plan Wiring (Volt Free Output); Heating Only Wiring (Volt Free Output); Control PCB Protection

16
GB-063C_f.615
CONTROL WIRING
PROGRAMMER
CYL STAT
N L 1 2 3 4 1 2 3
10987654321
L
N
E
240V
SUPPLY
3A Switched
Fuse Isolator
R P
Volt Free Boiler
Control
Connections
Junction
box
1 2 3
ROOM STAT
GRBRBL OR
HW zone valve
GRBRBL OR
CH zone valve
6 Amp
PROGRAMMER ROOM STAT
N L 1 2 3 4 1 2 3
10987654321
L
N
E
240V
SUPPLY
R P
Volt Free Boiler
Control
Connections
Junction
box
3A Switched
Fuse Isolator
6 Amp
Figure 1
Heating & Hot Water Wiring: S Plan (Volt Free Output)
UsedforIndirectPlumbingSystems

!
This S plan wiring schematic will provide a volt free contact across the boilers RP Connections.
No voltage has been taken to the Grey cable of the zone valves therefore creating a volt free contact
across the grey & orange switch wires of the valves when heating or hot water is in demand.
If the boiler is connected to an existing heating control system with 240 Volt switching then the boilers
control board should be setup as mentioned on page 14 (240 Volt control signals).
Figure 2
Heating Only Wiring (Volt Free Output)
UsedforDirectPlumbingSystems

!
The Boilers Control PCB will be damaged if a voltage it put to the RP connections!