Keystoker – Schuylkill Haven, PA 17972
Koker, Koker Lite & Econo 90 Stoker Coal Stoves
© June 2019 REV 4
- 8 -
Diagram 1 – Continuous Heating
Depicts what fire should look like when thermostat calls for heat for extended period:
A.
Unburned fresh coal supply from coal hopper
B.
Burning Coals
C.
Ash on end of grate (around 1” to 2”)
The actual length of burning coals will vary as heat demand increases or decreases. If
burning coals fall off grate, reduce coal feed by turning white adjustment nut in a
counter clock-wise direction 1 or 2 full turns. Wait at least 1 hour before making any
more adjustments.
When thermostat is calling for heat, the gear motor will be in continuous run, but if the
fire bed remains small, increase the coal feed by turning white adjustment nut clock-
wise.
Under normal draft conditions, when fire bed has reached its maximum length (with 2”
of ash) flames should be touching top of interior stove plate. If flame is not reaching top
of stove:
1.
Fire bed may be too thick.
2.
Reduce coal feed.
3.
Hopper end of stove is not plumb.
4.
Burrs may be stuck on grate, scrape grate until it is smooth.
5.
Not enough air flow, adjust air intake shutter on combustion motor
(see Check Draft section).
A.
UNBURNED
COAL
B.
FIRE
C.
ASH
DIAGRAM 1
