Vacuum loss: Pellet stoves require a clean,
unrestricted flow of combustion air to perform safely and efficiently. Vacuum loss can occur if any of the following circumstances exist:
|The exhaust setup should be done in such a way as to keep the
horizontal length to a minimum, (See Installation
Page) too long a horizontal run will slow the air flow
down to a point where vacuum loss can occur. This is caused by a lack of natural
convective rise in the horizontal section which means that the exhaust blower
has to physically move this exhaust without the help of this natural rise. Two
to three ft. of horizontal will generally work. As for the vertical portion of
mandatory that the vertical must be
at least 3'
but it can be run higher. In this case, if the installation will require more
than 15 ft of total pipe for the exhaust run, the pipe diameter should be
increased to a 4" diameter at the 15 ft mark.
||The unit is designed to handle
a standard through the wall pipe kit which contains two 90 degree elbows. One of
which is a "clean out tee" which is placed at the bottom of the vertical stack
to allow ease in cleaning of the flue pipe itself, and the other is generally
placed at the top of the vertical to turn the flow of exhaust away from the
structure if the flue is not being run above the roofline, before attaching the
horizontal cap. Additional 90 degree elbows to this system can add resistance,
or back pressure, to the flow of exhaust which could compromise the free flow of
air needed for proper function. For "catty corner" installations an additional
elbow is used. This elbow would be a 45 degree and would provide much less
resistance; therefore addition of this piece would generally not compromise
Outside Intake Air source is
with all freestanding England's Stove Works' pellet units! As stated above, the
free flow of air through these units is extremely important to ensure proper
function. Virtually any structure into which a pellet stove would be installed
will not have enough draftiness built into it to allow for the amount of air to
leak back into the structure at the rate a pellet stove will remove it,
the size of the structure is not a factor in this;
therefore, a buildup of "negative pressure" will occur as air is removed from
the structure. This buildup would then restrict the free
flow of combustion air through the unit and will cause a loss of vacuum.
Improper installation of the outside air intake can also cause vacuum loss; the
unit is designed to be connected to a 2" intake pipe which should be installed
in as short and direct a manner as possible. This pipe would have to be less
than 6 ft. in length and may not contain more than two 90 degree elbows. If these
parameters cannot be met, the diameter of the intake must be increased to a 3" pipe for the entire
length of the intake run.
Most basement installations
have to be done in this manner. (See
Basement Installation Page)
The intake pipe should be equipped with a screen to keep any animals, bees or
foreign material from getting into the intake, but the screen used should not be restrictive in
its makeup, and should be installed above the snow drift line in areas where
this could be a problem.
||Vacuum loss can occur at higher
elevations due to the air being thinner, installations above 4,000 ft above sea
level should be done using a 4" pellet vent pipe
rather than 3" and intake should also be done in 3" in most cases.
Failure to properly clean and maintain the unit can cause loss of vacuum
to occur. Proper airflow will not be attained if the unit is not cleaned
out regularly. Areas that must stay clear are:
- The firepot itself,
especially the area
the wear plate, must not be
allowed to become blocked. This area should be cleaned out at a minimum every
few days or daily if the unit is being run on higher heat ranges.
impingement plate (or baffle plate) should be removed weekly and all areas
behind it should be thoroughly cleaned.
- The heat exchangers, which can be
accessed when baffle plate is removed, should also be thoroughly cleaned.
- The flue itself (the pellet vent pipe) should be cleaned monthly or after every
ton of pellets (whichever comes first).
- The entire stove and flue system
should be fully cleaned and serviced annually.
Failures due to neglect in cleaning
or maintenance will not be covered under warranty!
It is recommended that an ash removal system be utilized to perform cleaning on
these units, contact your hearth retailer or England's Stove Works to obtain such
||Other possible causes for
would include; non functional exhaust blower, a loose wire from the flue
blockage vacuum switch to the control board (these wires connect to the control
board near the bottom of the board), a loose hose connection from the flue
blockage vacuum switch to the exhaust chamber, a blocked connection where the
hose connects to the exhaust chamber, or, an improperly positioned baffle plate
which would allow exhaust to bypass the top of the heat exchanger, i.e.. If the
baffle plate is not positioned flat against the back wall of the firebox at the
bottom allowing the fire to get behind it, (this would cause higher exhaust
temperatures that could damage the vacuum hose or cause vacuum loss due to lack
of air density (the hotter air gets the less dense it becomes, this makes it
much harder to sustain vacuum pressure)).
- Using alternative fuels such as
dried corn or cherry pits, which tend to feed faster, have different
burning characteristics and Btu outputs. These fuels tend to burn hotter, and in
the case of corn, the kernels burn slower than pellets do, so they can build up
in the firepot and cause the fire to become hotter than it is supposed to.
have any further questions or concerns, please contact Customer Service at:
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