Introduction - Carbolite GHA Installation, Operation & Maintenance Instructions Manual

G range
1.0 I
NTRODUCTION
1.1 Products Covered
This manual contains installation and operating instructions for the single-zone tube furnaces of
model types GHA and GVA, and the three-zone models GHC and GVC.
The single-zone models use one controller or programmer operating on all elements. The three-
zone models use three controllers, usually linked to achieve and extended uniform temperature
region, but independent controls and extended end zones are available as options.
The horizontal tube furnaces GHA and GHC are supplied with the controls in an integral base (or,
to order, with the base control panel blanked off, and the controls in a separate box). A horizontal
tube support kit, comprising some parts of the versatile stand, is also available.
The "versatile" models GVA and GVC models are supplied with a stand kit for horizontal, vertical
or wall-mounting use, and have the controls in a separate box on a length of flexible conduit.
Optionally the stand foot can be omitted, or the complete stand can be omitted.
All G-range tube furnaces have "modular" heating elements in which resistance wire is partially
embedded in vacuum formed light-weight refractory fibre. The modules are 150mm long. In all
standard models the two end elements (one at each end) are rated at 1170W maximum, while the
other (centre) elements are rated at 780W.
All models are supplied with a pair of "tube adaptors", which can be made to suit any work tube
size up to 170mm outside diameter. Spare or replacement adaptors can be ordered.
This manual may also be issued with custom versions of the above; for example, with elements of
non-standard wattage, with 2-zone or 5-zone models, or other possibilities based on the underlying
design concept.
1.2 Switches and Lights
1.3 Warning Symbols
2
Instrument switch: when the instrument switch is operated the temperature
control circuit is energised.
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
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.
MF48 -1.18