HST, VST
INTRODUCTION
1.1 VST & HST models
The VST range comprises split tube furnaces designed for use vertically, with several mounting
options: the furnace may be provided with no stand; or with a wall bracket; or it may be fitted to
one of two stand designs – near and far.
The HST range uses the same insulated split case as the VST, fitted inside an outer case designed
for horizontal use – though this may be fitted to an L-stand which allows for both horizontal and
vertical use.
All models have a separate control box connected by electrical conduits or leads.
1.2
Voltage and Power Control
All models in this range, from March 2001, are supplied with heating elements designed for use
over the voltage range 200V-240V or 3-phase equivalents. The Carbolite control system
incorporates a “power limit” which effectively limits the voltage to 208V. It is most important that
any alternative system provided by the customer should be able to limit the power accordingly.
See sections 3.6 and 8.2.
1.3
Switches and Lights
Supply Light: when the furnace is connected to the electrical supply the
light in the adjacent switch glows
Heat Light: the adjacent light glows or flashes to indicate that power is
being supplied to the elements
Heat Switch: the switch disconnects power to the heating elements; unless
this switch is off there is a danger of electric shock when inserting objects
into the furnace
1.4 Warning Symbols
DANGER of electrical shoc
– 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.
2.0
2 MF13
