Carbolite HRF 7/45 User Manual
Page 3
HRF
MLF05-1.23
3
2.3 Electrical Connections
Connection by a qualified electrician is recommended.
Model HRF 7/45 may be supplied single phase or 3-phase (star or delta).
Check the furnace rating label before connection. The supply voltage should agree with the voltage
on the label, and that the supply capacity should be sufficient for the amperage on the label.
The supply should be fused at the next size equal to or higher than the amperage on the label. A
table of the most common ratings is also given in section 8.1 of this manual. Where a supply cable
is present there are internal supply fuses; customer fusing is preferred but not essential.
Furnace with supply cable: either wire directly to an isolator or fitted with a line plug.
Furnace without supply cable: a permanent connection to a fused and isolated supply should be
made to the internal terminals after temporary removal of the furnace back panel.
Connection by line plug: the plug should be within reach of the operator, and should be quickly
removable.
Connection to isolating switch: this should operate on both conductors (single phase) or on all live
conductors (three phase), and should be within reach of the operator.
The supply MUST incorporate an earth (ground).
CONNECTION DETAILS
supply type
Supply
Terminal label
Cable colour
Live-Neutral
Reversible or Live-Live
1-phase
L
Brown
To live
to either power conductor
N
Blue
To neutral
to the other power conductor
PE
Green/Yellow
To earth (ground)
to earth (ground)
supply
Terminal label
Cable colour
3-phase
L1
Black
to phase 1
L2
Black
to phase 2
L3
Black
to phase 3
N
Light Blue
to neutral except delta
PE
Green/Yellow
to earth (ground)
2.4 “Universal Wiring”
HRF 7/45 when ordered 3-phase: 2003 onwards.
If the HRF 7/45 model is ordered for a 3-phase supply, it can be easily rewired between 1-phase
and 3-phase supplies. This applies to 3-phase+N and 3-phase delta in the ranges 380/220V–
415/240V and 208-240V, but does not apply to 3-phase star without neutral (e.g 380V).
To alter the configuration, remove the back panel and alter the wiring connections between the
supply terminal block and the EMC filters, using the appropriate diagram from section 7.3.
Models made for single phase only and models before 2003 are not affected and cannot be
converted to 3-phase.
If in doubt, please consult Carbolite.