Keystoker K-2 Instructions for use

K-2 & K-6 Direct Vent
Operating instructions and maintenance enclosed
Thoroughly read and understand instructions
Always leave this manual with stove owner
Follow the instructions within this manual. If instructions are not
followed, a fire may result causing property damage, personal injury, or
even death.
A carbon monoxide detector has been supplied with your stove. You must
plug it in.
Danger risk of fire or explosion. Do not burn garbage, gasoline, drain oil,
or other flammable liquids. Do not use chemicals or fluids to start fire.
Burn rice anthracite coal only
Stoves surfaces may be hot while in operation. Keep children away. Do
not touch during operation
Do not connect this unit to a chimney flue serving another appliance.
Follow all local building and Zoning ordnances

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Through these instructions we will try to guide you on a step by step procedure for installing,
adjusting and operating of your new KEYSTOKER stoker boiler unit.
Selection of location. Keystoker boilers are available with fire door on the right or left side.
When you stand at the stoker end of the boiler and look directly over top of boiler toward stack
end, you may choose to have a fire door on the right or left side of boiler. Selecting a position
to make this door accessible is important. When door side must be placed toward a wall, 30”
clearance is recommended for easy fire and ash door access. Clearance from wall at stack end
should be 18” to permit removal of water heating coil if necessary. Clearance on blank and
hopper sides should be 6”.
Setting up boiler. Place boiler in desired position. We strongly recommend placing steel
shims or bricks under each corner of boiler to allow an air space, to prevent moisture from
accumulating and rusting base of boiler. Using a level, plumb stoker end of the boiler, adding
steel shims as necessary to plumb the stoker end of the boiler. Failure to do this will change
pitch on stoker unit and may have adverse effects when burning coal. Again with level, check
top of boiler from side to side, adding shims as necessary to level boiler. Do not place shims
completely under boiler. Allow 1” to 2” of shims to extend out from under the boiler. Shims
will then be used as a base to rest insulated jacket upon.
Supply & Return piping system. The top of you boiler has at least 4 openings. The largest
opening is the feed line to your radiation. Since this outlet has a drop tube welded inside the
boiler, you must use if for your radiation supply line. Even thou it may be necessary to bush
down to a smaller size, we recommend starting with 1 ¼” pipe and installing a 1 ¼” x 1 ¼” x 1”
tee in supply line to be used for a by-pass loop. (You may now make your piping connections
from feed outlet on boiler to flow valve.
You may use either of the large openings on the bottom of the stack end of the boiler as your
return. Select the side that will allow convenient access to the circulator for future servicing.
Install return piping and circulator, again referring to (Installation Diagram Pg 7) for location
of by-pass loop. Your 1 ¼” x 1 ¼” x 1” tee must be installed below circulator. (See Installation
Diagram Pg 6).
Install by-pass loop as per (Installation Diagram pg 6) with 1” pipe size. Place a tee 1’ x ½” F x
1” in by-pass loop to allow installation of immersion well for the 4006B Honeywell Hi Limit
control to extend into full water flow.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Over 50 years of installation experience has proven to us that the above mentioned by-pass loop
is absolutely necessary for optimum performance of your heating system .
Install a boiler drain valve in the large opening at the bottom of boiler. Install a male adapter in
boiler on opposite side of boiler drain before installing stack end of boiler see diagram pg 6
Boiler feed and domestic water piping. Refer to diagram pg 8
Install ½” male adapter in both fittings on domestic water coil. Install a ½” male adapter in the
½ “ fittings on the top of the boiler to be used for a boiler water feed. Solder a 7” long piece of
pipe into boiler pipe fitting. Before installing stack end of jacket
Note: Before proceeding with connections for piping of boiler return and domestic water
Install stack end of insulated jacket Now. Then you may proceed with completion of domestic
piping and instillation of necessary valves.
Install a domestic water mixing valve, we recommend a Honeywell AM-1 series not included
with boiler install as per manufactures instructions (See Diagram Pg 6).
If an automatic fill valve is desired, install as per manufacture’s instructions.
Install a PH 5 expansion tank on the domestic mixed water line as per manufactures instructions
Installation and piping of accessories: A ¾” 30 lb. AMSE approved relief valve must be
installed in ¾” fitting on top of boiler, turning discharge to the side and hard pipe it to 3” above
floor (See Diagram Pg 6).
Install altitude gauge (temperature/ pressure gauge).
Connect expansion tank directly to remaining fittings on top of the boiler, NOT to any other
part of the heating system. Install a 1/2 ” ball valve in pipe going to expansion tank with
direction marker on valve pointing toward the expansion tank.
Install immersion well for low water cut off, in ¾” fitting on side of boiler above fire door in
lower hole closet to unit end of boiler.
Install immersion well for Triple Aquastat, in ¾’ fitting on side of boiler above fire door in
upper hole.
Place fire door into boiler opening and secure by tightening screws in frame of fire door. Seal
fire door with high temp. Silicone or furnace cement. Install spring handle on fire door handle

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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by bending spring handle open and put it through hole in handle on fire door and squeezing it
closed.
Jacket and stoker installation: Install hopper end of jacket, then blank side, then fire door
side, secure with #8 x 1 sheet metal screws provided. Install jacket top and secure with #8 x 3/8
sheet metal screws.
Stoker units are shipped entirely assembled. Lift stoker into opening, bottom of a stoker has a
¼” rod welded in place which must go inside the stoker opening. Place a thick smear of furnace
cement or high temp. Silicone on flange of stoker and tilt into place, securing with 3/8 x 1 ¼
machine screws, washers, and nuts as provided.
Set hopper into place. The hopper bottom should lap over stoker throat approximately 1”. Since
one hopper is use for several size stokers, it may be necessary to trim the opening. Bend flange
down to fit inside throat of stoker –be sure mechanism is free to operate.
Control installation and electrical wiring: Install triple aquastat into its well being careful
not to kink the thin capillary tube. Install low water cutoff onto its well. Screw timer to jacket
next to the triple Aquastat (See Diagram Pg 6).
Install 4006B hi limit into well in by-pass loop. Your stoker must be on its own circuit. From
main breaker to boiler use 12-2 wire with ground on a 20 amp breaker. Follow wiring diagram
and any applicable UL and local code
If pipe must be run inside of house, we strongly recommend using a tee with cap instead of
elbow at bottom of riser pipe. You must seal all joints using high temperature silicone see page
10 if going through a combustible wall.
Safety inspection of a venting system should be performed before and after installing your new
stove. Procedures to follow are those recommended by National Fuel Gas Code, ANSI Z223.1
or refer to local codes or ordinances.
Plan the vent system layout before installation to avoid possibility of accidental contact with
concealed wiring or plumbing inside walls.
Plumb hopper end of stove with level. Mount hopper in place and fasten securely. Reach down
into bottom of inside hopper and bend flange of hopper into throat of stoker.
After determining location of stove, (if you are going through a frame wall) cut a hole through
exterior wall slightly larger than the 6” black pipe. Put stove into position to determine stove
pipe length needed to have at least 6” of pipe extending past exterior wall.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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From outside of home, insert 4” stainless steel pipe through opening in wall, … through #5
blank plate and through #4 (which is the 6” cap with 4” hole)… and slide pipe over exhaust air
tube. Secure with screw. Seal pipe with high temperature silicone or equivalent. Secure #7
screened plate to outside wall. See pg 11.
It is not necessary to use 6” black pipe if 4” pipe is going through a non-combustible wall, such
as concrete or block. No barometric draft control is required
On outside of home, place 4” stainless steel tee on exhaust pipe. Place 4” stainless steel rain
cap on top of 4” tee. Secure with screws. Leave bottom of stainless tee open.
Depending on location of exhaust venting to outdoors, varying draft and wind conditions may
cause occasional tripping of reset button, causing fire to go out.
Draft and air intake settings are preset at factory and it is usually not necessary to change for
installation going straight out through the wall. It is still recommended to check draft settings
with draft gauge after starting fire.
If extra stove pipe must be added inside home to achieve necessary height to go above outside
grade level, it may be necessary to adjust combustion air intake shutter located on combustion
motor, to achieve proper draft setting of -.02
Initial start up: Fill system by opening boiler feed valve. Open air vents on radiation one at a
time until air is removed from system. Normal operating pressure on most heating systems is
between 10 and 20 PSI. Automatic fill valves are factory set at 12 PSI. If an automatic fill
valve is not used, then boiler feed valve must remain in normally closed position.
Open valve supplying water to domestic hot water coil, this valve must remain in the normally
open position.
Starting coal fire: DO NOT USE ACCELERANT SUCH AS: as gasoline, lighter fluid, or
kerosene, etc. Use dry coal only. Put coal in hopper. By reaching through fire door, pull coal
down to cover entire grate. Crush several charcoal briquettes into smaller pieces, crumble
newspaper and dig it through the coal, so it touches the grate. Lay charcoal on top of
newspaper. Turn switch on. When charcoal turns red, place a few hands full of coal on top of
charcoal. If fire moves toward bottom of grate before fire is established, coal feed can be
slowed down by turning red nut CCW or by flipping feed bolt to a sideward position.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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After starting coal fire: Allow stove to warm up. With air shutter on combustion blower is
about ½ open Insert draft guage through pre-drilled hole in the upper portion of the fire door.
Adjust draft to a -.02 at full fire. Draft is adjusted on venter by opening or closing the t handle
shutter. (see diagram page 10)
To obtain a more complete burn of the coal, the combustion motor is designed for continuous
run.
When there is no demand combustion motor will continue to run and cause the coal already on
the grate to burn. Rather than to allow the coal to smolder and die out in an unburnt condition.
This will achieve a cleaner ash, and allow more heat to be produced and absorbed into heating
system.
During the summer months of operation the small combustion motor will force a small amount
of air going through the grates at all times, which will cause ash to become like powder. It also
prevents the fire from going out. At the same time, it reduces the size of the fire bed to
approximately 1 ½ to 2 which will prevent boiler water from becoming overheated.
Proper size of fire is obtained by turning white feed nut on pusher bar clockwise for more feed
and counterclockwise for less coal feed.
Location and final placement for white nut will be determined by size of coal you purchase.
For rise coal, the white nut might be turned down 5 to 6 turns for maximum setting, whereas,
for buckwheat coal the white nut might be only be turned down 3 to 4 turns for maximum
setting
During winter operation hot coals should never be pushed off the end of grate. This indicates
that the coal feed needs to be reduced or if during winter operation the fire bed is too small
increase coal feed.
After coal feed adjustment is completed, if during the summer the water is too hot..DO NOT
ADJUST THE COAL FEED reduce timer only. If fire goes out DO NOT ADJUST COAL
FEED increase timer only

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Side View

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Top View

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Front View

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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VENT TERMINATOR LOCATION
VENT TERMINATOR MAY NOT BE LOCATED
1. Less than 1 foot above grade.
2. Above or within 3 feet horizontally of oil tank or gas meter.
3. Closer than 3 feet to inside corner of home.
4. Closer than 1 foot from any opening that gasses could re-enter home.
5. Less than 4 feet below windows.
6. Less than 1 foot horizontally of door or window.
7. Less than 3 feet above any forced air inlet located within 10 feet.
8. Less than 7 feet above grade when adjacent to public walkways.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Maintenance
1. Motor: Inspect and oil motor at least once a year, motor should rotate freely
2. Wheel: Inspect venter and exhaust wheel at lease once a year to thoroughly clean soot,
ash, dust or any coating which may inhibit either rotation or air flow
3. Vent System: Inspect all vent connections at least once a year for looseness,
evidence of corrosion and for flue gas leakage. Replace seal or tighten pipe as necessary
It may be necessary to clean exhaust system and stove pipe during heating season. Remove
hanging baffle above 6 inch exhaust outlet inside stove. Brush pipe in circular motion and
vacuum stove pipe. To clean exhaust motor and radial fan blade, remove 4 screws on mounting
bracket of exhaust fan and clean fan housing.
During annual maintenance, the ½ tube on safety fume switch must be cleaned out by
vacuuming or by using a small brush. Vacuum or brush from inside of stove.
It is most important to perform the annual maintenance at the end of heating season. Residue
left on the fan blade and exhaust system may cause rapid deterioration during non use.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Direct Vent Completion Kit
1. Exhaust motor
2. Exhaust system
3. 4 inch stainless steel pipe
4. 6 inch cap
5. Inside plate
6. 6 inch 24 gauge black pipe
7. Outside Plate
8. 4 inch Tee
9. 4 inch Chimney cap

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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A.Unburned fresh coal supply from coal hopper
B.Burning Coals
C.Ash on lower end of grate (around 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:
A. Fire bed may be too thick.
Reduce coal feed.
Hopper end of stove is not plumb.
Burrs maybe stuck on grate, scrape grate smooth.
Not enough air flow, adjust air intake shutter on combustion motor (see check
draft).
DIAGRAM (2)
When thermostat has not called for heat for extended periods:
A. Unburned fresh coal supply from hopper.
B. Burning coal (about 1-1 ½” to 2”) (low flames).
C. Ash on lower end of grate

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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PUSHER BAR: Moves in a reciprocating motion. Activated by cam on gear motor to force
coal from hopper onto grate. Also pushes ashes off bottom grate into ash pan. Length of
stroke is adjustable by turning coal feed adjustment nut.
WHITE COAL FEED ADJUSTMENT: Turn clockwise for more coal feed, Turn
counterclockwise for less coal feed.
NYLON ADJUSTING SCREWS: To eliminate metal on metal contact. There are 8 nylon
screws on the pusher bar, 4 on each side. The 4 nylon screws pictured on diagram are used to
adjust the amount of sideward movement of pusher bar. When nylon screws are properly
aligned, the pusher bar will slide in and out freely and have only a slight sideward movement.
Nylon cam: located on gear motor. To give reciprocating motion to pusher bar shown on next
page
Air Intake Adjustment Shutter: adjusts amount of air flow through fire. Shown above
GEAR MOTOR: The drive shaft turns approximately 1RPM. The nylon cam on drive shaft
will, when moving inward, force coal from hopper onto grate. When withdrawing, will allow
coal to fall in front of pusher bar for preparation of next inward stroke. The gear motor will
only run when activated by a call for heat from thermostat or when timer turns it on.
COMBUSTION MOTOR:Combustion motor will run all the time to force air through holes
in grate to burn coal hotter. The constant running of motor will assure the maximum amount of
heat is gained and will aid in a more complete burning of coal. The motor has an adjustable air
shutter for regulating air flow through fire.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Pusher Bar
TIMER

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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Unless your stove had been a special order, it will be equipped with our patented flat grate
stoker unit and a timer. The timer is shown on the next page.
The purpose of a timer is to maintain a minimum fire when thermostat is not calling for heat.
The timer is factory set to run 1 ½ minutes every 10 minutes. The timer activates the gear
motor, which will cause the pusher bar to move in a reciprocating motion, forcing the coal onto
the grate.
The timer has a large yellow wheel that makes 1 revolution every 30 minutes. Pins can be
inserted or removed from yellow wheel. Each pin equals about 15 seconds, if needed extra pins
can be added to the present group of pins or pins can be inserted anywhere in the yellow wheel
This sections ONLY pertains to periods when thermostat is not calling for heat. If the fire goes
out you will have to add more pins to the timer for increase coal feed.
The burning coals should be the width of the grate and about 1 ½ to 2 inches in length. If the
burning coals get less than 1 ½ inches the fire may go out. Solution increase coal feed. A weak
draft can also cause the fire to go out. If fire appears to be very dull add as many extra pins to
timer as needed, until fire stays lit.
TO REMOVE GEAR MOTOR: FIRST…Pull power cord pug from 115V outlet.
Remove 10-24 machine screw and then remove protective cage. Disconnect both blue wire nuts
marked. Remove both 10-24 machine screws from mounting bracket Slide gear motor out of its
track toward you, pusher bar will also come out with gear motor.
While pusher bar is out of its chute, clean chute area and remove any obstructions. Check nylon
screws on pusher bar (2 on each side) for wear or breakage. (Replace if necessary)
Slide pusher bar in and out of chute (should move freely) check for sideward movement.
Adjust nylon screws on right side to allow only a slight sideward movement.
TO REPLACE GEAR MOTOR: -remove (4) 10-32 machine screws that hold gear motor
onto mounting bracket. Before removing gear motor from bracket, look at position of gear
motor; install new motor in exact same position before reinstalling screws. Then reverse
procedures and reinstall.
When replacing gear motor with a new one, both gear motor wires are black; either wire may go
to black or white wire from power supply.

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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TROUBLE SHOOTING HINTS
PROBLEM
POSSIBLE CAUSE
REMEDY
Stoker doesn’t run
Main circuit breaker tripped
Reset
Main fuse blown
Replace
Lo water level (steam)
Fill boiler to proper water level
Gear Motor Stops
Obstruction in throat of stoker
Empty hopper and clear
Feed mechanism tight or
corroded
Empty hopper and free-soaking
with penetrating oil-Use dry coal
to prevent reoccurrence.
Motor or gear motor defective
Replace
Pressure fluctuates and water out relief
valve
Expansion tank full of water
Relief valve defective
Drain –Close valve in pipe that
goes from expansion tank to
boiler. Drain tank dry. Close
drain in expansion tank. Open
valve in pipe to expansion tank.
Put water pressure in boiler up to
12 to 15 lbs.
Triple Aquastat with High and Low settings

K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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TROUBLE SHOOTING HINTS
PROBLEM
POSSIBLE CAUSE
REMEDY
Stoker runs but
doesn’t feed coal
Feed nut backed off
too far.
Increase feed-see preceding
instructions.
Obstruction in throat
Empty hopper and remove
of stoker.
obstruction.
Feed mechanism tight
Empty hopper –free- use dry
or corroded
coal to prevent reoccurrence.
Broken Nylon Screws
Replace
Defective gearbox
Replace
Feed mechanism out
Throat bar height to be 1-3/4”
of adjustment
to 2” (Part #11). Pusher bar
(Part #12) to be approximately
¾” behind the face (flat part)
of throat bar when in its most
forward position with feed nut
(Part #19)
Circulator
Lo limit setting in
Summer Winter
doesn’t run
Triple aquastat too high
Set Lo at 140 160
Boiler not up to
Set Hi at 160 180
temperature.
Fire bed too small
Increase coal feed to get
bigger fire.
Defective thermostat
Replace
Circulator defective
Replace
Circulator runs
Air in lines
Purge air from radiation
but no heat
Pressure low.
Increase –12 to 15 lbs.
Check for leaks if pressure
drops frequently.

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KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
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