11
3.7.4 Torque settings
!
WARNING
Continuous voltage is present at the terminals in
the junction boxes. Before any electrical work is
done, the power supply must be disconnected
and secured against activation while the work
is in progress.
Component
Torque
G 1.1/4” heating element
60 Nm (+/- 5)
Thermostat screws
2 Nm (+/- 0.1)
Screw on the element head
2 Nm (+/- 0.1)
3.7.2 Cylinder thermostat in the upper junction box
The factory fitted cylinder thermostat in the upper
electric junction box is designed for thermostatic
control of an optional external energy source (not
included). See user manual for the external energy
source for wiring plan.
3.7.3 Electrical connections in the lower junction box
A) Live wire (L) is connected to point ‘1’ on the
safety thermostat.
B) Neutral wire (N) is connected to point ‘3’ on
the safety thermostat.
C) Yellow wire with green stripe – Earth – is
connected to the terminal on the heating ele-
ment (hexagonal brass)
D) Internal wires from the element to the ther-
mostat are factory fitted and connected to point
‘4’ on the safety thermostat and point ‘2’ on the
work thermostat. See illustration (right).
3.7.1 Electrical components
Component
Note
Safety cut-out, upper & lower 85°C thermal cut-out
Safety thermostat, upper box 40-70°C adjustable
Work thermostat, lower box
40-70°C adjustable
Immersion heater, lower box
1ph. 230V 1-barrel
Internal wires, lower box
Heat-resistant
3.7 Electrical installation
Fixed electrical fittings must be used for instal-
lation of OGC domestic heating units. Any elec-
tric fittings must be installed by an authorised
electrician. The relevant standards and regula-
tions must be followed.
Wiring diagram
2.8 kW - 1x230V
Lower electric
junction box
RESET
RE
SET
M2
1
2
3
4
THERM-O-DISC
40°C
70°C
60°C
50°C
1
2
L
N
Strain
reliever
Cylinder thermostat
Upper electric junction box
RESET
RE
SET
M2
1
2
3
4
THERM-O-DISC
40°C
70°C
60°C
50°C
1
2
Safety
cut-out
Working
thermostat
