K-2 and K-6 DIRECT VENT with FLATGRATE UNIT
KEYSTOKER BOILER INSTLLATION INSTRUCTIONS
4
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.
