Limit Timer
The limit timer is a clock motor driven device that causes the Kiln Sitter
® to shut power off to the
kiln after a preset number of hours. It is not a substitute for firing with cones, but a backup to the
Kiln Sitter
® to help prevent severe damage to the kiln caused by Kiln Sitter® failure. The timer
may be set for any period up to 20 hours and may be readjusted during firing. Of course, to be of
use as a backup device, the unit must be set properly for a time great enough to fire your ware,
but for a time less than required to overfire. It should be set ½ hour longer than the estimated
firing schedule. The FIREMATE
® is so repeatable that the timer will have significant value as a
backup device.
WARNING
We cannot extend our warranty to cover damage caused by overfiring for any reason,
since we have no control on proper use of the limit timer. Do not leave any Kiln
unattended while firing. Periodically check pyrometric cones placed behind peepholes to
prevent overfiring.
Limit Timer Operation
1. Use the Kiln Sitter
® instructions and the following steps.
2. Set the indicator knob for the estimated time of firing plus ½ hour. This is required before the
plunger will stay locked-in.
3. The time does not start until the plunger is pushed in. It runs even when the kiln switches are
turned off, if the plunger is pushed in.
4. If the timer shuts the Kiln Sitter
® off before your ware is fired, the firing may be completed
by lifting up the Kiln Sitter
® weight, pushing in the plunger, and letting the weight down
gently. You then fire manually turning all switches off when the witness cone (behind the
peephole) bends.
5. Turn the timer switch to “off,” and the thumbwheel switch to “▲” after every firing even if
the Kiln Sitter
® appears to have operated properly.
[Insert FIGURE 3-7 LID BRACE]
[Insert FIGURE 3-8 LID PROP]
Lid Brace
The lid brace locks the lid in the open position for loading and unloading. Pull lid up until the lid
brace engages the slot on its arm. Then lower until lid is locked. Test by gently raising and
lowering lid to make sure the lid is locked before letting it go. To unlock, gently pull the lid brace
arm up while raising the lid a few inches, then lower the lid past the locking slot and gently lower
the lid. Do not drop the lid, as the firebrick is fragile.
Lid Prop
A self releasing two position lid prop is provided. The highest lid prop position is used for normal
venting at the beginning of the firing cycle, providing approximately a 2” vent. The lowest lid
prop position is used for the later portion of the firing cycle for china, lusters, and gold firing to
obtain the best possible results. It operates simply by rotating the prop to engage the catch
mounted on the lid. To release, raise the lid by the handle, causing the lid prop to swing out of the
way.
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