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Gilson Company, Inc.
N. Hold Time: Hold Time means the heat-soaking time
at the end of the segment. The temperature in each
segment can be held for up to 99 hours and 99 min-
utes.
O. Present Status: Present Status shows which seg-
ment the furnace is in while firing. This function is
especially useful for firings that have heat-up and
cool-down segments. To use Present Status, press
the <PRESENT STATUS> key during a firing. The
current segment will display momentarily.
P. Continue: Continue works only during firing. In a
binder ignition program, CONTINUE starts the igni-
tion cycle after the sample has been loaded. In a
Ramp-Hold program it is used to skip to the following
segment of the program by pressing <CONTINUE>
followed quickly by the <ENTER> key.
10.0 MAINTENANCE & TROUBLESHOOTING
WARNING!
ALWAYS disconnect and lockout electrical supply to
the furnace prior to performing maintenance or repair.
NOTE: See Section 11.0 for diagnosis of Controller
problems.
10.1 Electrical Problems
If the furnace stops heating while firing, check fuses or
circuit breakers first. A blown fuse or tripped circuit breaker
is not necessarily an indication of electrical trouble with the
furnace. A short circuit causes a large amount of current
to flow, generating so much heat that the fuse or breaker
opens the circuit almost instantly. If the furnace should blow
a fuse after firing for some time, there is little probability
of a short. Replace the fuse or reset the breaker, and, if
it does not blow again as soon as the furnace is turned
back on, there is no short in the furnace wiring.
A loose or poor connection at the fuse or breaker will
generate heat. If the fuse or circuit breaker panel feels
unusually warm, have an electrician check for loose
connections, particularly at the center screw of the fuse
socket, even in a new fuse box.
Slow Firing:
The furnace should preheat to desired conditions in one
hour or less. If not, the probable cause is a low voltage
supply. A minimum of 200V is required. If the furnace fires
too slowly, have the power company check your voltage
and readjust transformer if necessary.
Hot Plug or Outlet:
If the plug or outlet is hot, the probable cause is a defec-
tive plug or outlet. The remedy is to replace the plug if it
becomes too hot to hold.
WARNING!
DO NOT fire the furnace until the plug is repaired.
10.2 Elements
The elements in the Gilson Furnace will last for many
years of normal use. With time, however, the elements
will gradually draw less and less power, finally reaching
a point where they will not develop enough heat.
High temperature elements are damaged by contact with
silica or silica bearing compounds. If silica touches an
element, the element will burn out during the next firing.
This type of damage is NOT covered by the warranty.
Service life of the elements can be severely shortened
if the furnace is fired with a clogged filter. Filters should
be checked prior to each firing and changed before they
become clogged.
WARNING!
Reduction firing, which removes the oxygen from
the furnace, will ruin the elements. Reduction firing
destroys the coating of oxidation protecting the
elements. Reduction is performed at your own risk,
and elements damaged by reduction are not covered
by warranty.
10.2.1 Reseating
If elements are seated properly before firing the
furnace for the first time, there probably will be no
trouble in the future with an element bulging out of its
groove. However, should an element do this, it must
be reseated immediately as follows:
a. Once an element has been fired, it becomes
brittle and will break if it is bent while cold. Use
the following procedure to heat the element.
WARNING!
Always disconnect and lockout the power supply
before touching an element with anything!
Page 11
Gilson Binder Ignition System: HM-378
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