Carbolite TZF Series - Manual (Page 4)

1700-1800° Tube
4
MF32 - 3.25
which fit downwards through the roof in holes approximately 10mm diameter. Each hole has a
nearby terminal block.
Fit the sheaths into the holes. For the 1700°C furnace: Fix the sheaths in place using a self-tapping
screw through the wire in the nearby hole. For the 1800°C furnace: Fix the thermocouple and
sheath assembly to the top frame.
Insert the thermocouples and connect them to the terminal blocks. The leg of the thermocouple
with a blue paint mark is the negative. The negative side of the connecting cable is marked with a
double number (e.g. 11).
2.6 Electrical Connections
Connection by a qualified electrician is recommended.
The /300 models are designed only for single phase electrical supplies with or without neutral. The
larger models may be made for 1- or for 3-phase use. The furnace must be connected only to the
type and voltage of supply for which it was ordered.
The voltage or range of voltages on which the furnace may be operated is given on the furnace
rating label. Check that the supply voltage is compatible with the voltage on the label, and that the
current capacity is sufficient for the amperage on the label, before connection to the supply. A
table of the most common ratings is given in section 8.1 of this manual.
The supply point must be within reach of the furnace operator and must incorporate either an
isolating switch which operates on all live conductors, or a quickly removable plug.
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)
2.7 Inserting a Tube
If a work tube is supplied with the furnace, then the hole through the insulation is correctly sized.
Carefully line up the tube and ease it through the chamber. Using a pole such as a broom handle
may help with this operation.
For a tube of customer supply, ensure that there is approximately 1mm of free play sideways and
upwards. If the tube is too tight it will crack when heated. A tight hole can be eased by rotating the
tube, which has a sufficiently abrasive surface.
Remove loose dust with a domestic vacuum
cleaner. Safety note: see section Error!
Reference source not found..
If the holes in the insulation are too large, please
consult Carbolite for technical assistance.
If a long tube is specified, then a pair of
cylindrical end-guards is supplied. Bolt these onto
the furnace ends. The guards incorporate a
hookbolt and strap arrangement for supporting the