CONTENTS
Section page
Installation, Operation &
Maintenance Instructions
Models SNF and VMF/ASTM
This manual is for the guidance of operators of the above Carbolite products
and should be read before the furnace is connected to the electricity supply.
Manuals are supplied separately for the furnace controller
(and overtemperature controller when fitted).
Please read the controller manuals before operating the furnace.
MF31 – 3.06
Instrument switch: when the instrument switch is operated the temperature
control circuit is energised.
Heat Light: the adjacent light glows or flashes to indicate that power is
being supplied to the elements
DANGER of electrical shock– read any warning printed by this symbol.
DANGER – hot surface. Read any warning printed by this symbol.
WARNING: all surfaces of a furnace may be hot.
DANGER – read any warning printed by this symbol.
SNF
1.0 SYMBOLS & WARNINGS
1.1 Switches and Lights
1.2 Warning Symbols
2 MF31 – 3.06
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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)
2.0 INSTALLATION
2.1 Unpacking & Handling
When unpacking or handling the furnace always lift it by its case. Do not apply lifting force to any
protruding part..
Remove any packing material from the furnace lid or chamber before use.
NOTE: This product contains Refractory Ceramic Fibre (better described as Alumino Silicate
Wool) for precautions and advice in handling this material see the ‘Repairs and Replacements’
section.
2.2 Siting & Setting Up
Place the furnace in a well ventilated room, away from other sources of heat, and on a surface
which is resistant to accidental spillage of hot materials. Do not mount the furnace on an
inflammable surface.
Ensure that there is free space around the furnace. Do not obstruct any of the vents in the case:
they are needed to keep the controls and the case exterior cool.
Ensure that the furnace is placed in such a way that it can be quickly switched off or disconnected
from the electrical supply - see below.
The furnace is supplied with a crucible holder (a small component made of wire). Ensure that this
is present.
2.3 Electrical Connections
Connection by a qualified electrician is recommended.
The furnace requires a single-phase A.C. supply with earth (ground). The supply may be Live to
Neutral non-reversible, Live to Neutral with reversible plug, or Live to Live.
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 9 of this manual. Where a supply
cable is present there are internal supply fuses; customer fusing is preferred but not essential.
The furnace is fitted with a supply cable: either wire directly to an isolator or fit with a line plug. A
connection to an isolating switch should operate on both and should be within reach of the
operator. A line plug should be quickly removable, and should be within reach of the operator.
The supply MUST incorporate an earth (ground).
MF31 – 3.06 3
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3.0 OPERATION
The instructions for operating the temperature controller are given in a separate manual.
3.1 Operating Cycle
The furnace is fitted with an Instrument switch. The switch cuts off power to the control circuit.
Switch on the electrical supply.
Operate the instrument switch to activate the temperature controller. The controller becomes
illuminated and goes through a short test cycle.
Adjust the temperature controller – see separate manual supplied.
Overtemperature option only. If the overtemperature controller has not yet been set as required, set
it and activate it according to the instructions in the separate manual supplied.
The furnace starts to heat up according to the controller set point or program. The Heat light glows
steadily at first and then flashes as the furnace approaches the desired temperature or a program
setpoint.
Overtemperature option only. If the overtemperature trip operates then an indicator in the
overtemperature controller flashes, and the heating elements are isolated. Find and correct the
cause before resetting the overtemperature controller according the instructions supplied.
To turn the furnace off, set the Instrument switch to it’s off position; the controller display will go
blank. If the furnace is to be left off unattended, isolate it the electrical supply.
3.2 Notes on the Test
The furnace is intended for use with tests in accordance with BS1016: Part107.1:1991 and
ISO501:1981.
Before commencing the test, the furnace chamber lid should be opened and the temperature
allowed to stabilise for no longer than 2 minutes. The test should be conducted with the furnace lid
open. When the test is completed, close the lid to conserve energy and prolong element life.
3.3 Operator Safety
Ceramic materials used in furnace insulation can become conducting at high temperatures; there is
therefore a potential danger to the operator, as this furnace is designed to be used with the chamber
lid open.
To guard against this danger, the furnace is fitted with a 30mA earth leakage (residual current)
circuit breaker mounted in the back of the case. This trips out in the event of accidental contact
with the heating element or current leakage through the insulation.
The device may be reset after tripping out. From time to time, test it using the integral test button.
4 MF31 – 3.06
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