Carbolite CWF Installation, Operation & Maintenance Instructions Manual page 4

CWF, BWF, RWF
Electrical Connections
Connection by a qualified electrician is recommended
All furnaces covered by this manual may be ordered for single phase A.C. supply, which may be
Live to Neutral non-reversible, Live to Neutral reversible or Live to Live.
The 23 litre models can also be supplied for three phase use: they must only be connected to the
correct type of supply (star or delta at the correct phase to phase voltage). RWF /13 models (and
by special order the CWF & BWF /13) can be supplied for use on two phases out of a three phase
with neutral supply, leaving one phase unused.
Check the furnace rating label before connection. The supply voltage should agree with the
voltage on the label, and 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 fuse 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 fit 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).
ELECTRICAL CONNECTION DETAILS
Supply
1-phase
supply
2- or 3-phase
2.4 "Universal Wiring"
Year 2000: 23 litre 3-phase models only
Year 2001: 23 litre 1-phase and 3-phase
The 23 litre models (CWF, BWF, RWF --/23) 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 7.4.
Models made for single phase only (e.g. before year 2001) are not affected and cannot be
converted to 3-phase.
If in doubt, please consult Carbolite.
3.0
4
Terminal label Cable colour
L Brown
N Blue
PE Green/Yellow
Terminal label Cable colour
L1 Black
L2 Black
L3 Black
N Light Blue
PE Green/Yellow
supply type
Live-Neutral Reversible or Live-Live
To live to either power conductor
To neutral to the other power conductor
To earth (ground) to earth (ground)
to phase 1
to phase 2
to phase 3 except 2-phase
to neutral except delta
to earth (ground)
MF02