Enviro 50-1221 - Manual (Page 20)

If the fire should happen to go out and the heat output indicator has been set on the lowest setting, the
Slider Damper should be pushed in slightly, decreasing the air in the firebox.
If, after long periods of burning, the fire builds up and overflows the burn pot or there is a build up of
clinkers, this would be a sign that the pellet quality is poor, this requires more primary air, the slider
damper must be pulled out to compensate. Pulling the slider damper out gives the fire more air.
Installation
S
LIDER
/D
AMPER
S
ET
-U
P
:
This is used to regulate the airflow through the pellet stove. The slider damper should be set
by a trained technician using magnehelic.
The slider damper is located behind the left side panel. To open the left side panel, undo the one screw
Air Intake Box
Exhaust Channel
Slider Damper
Exhaust Blower
Figure 28: Slider/Damper Plate in Unit.
located in the upper front corner of the
cabinet side between the louvers. Also
loosen three screws down the back of the
side panel.
The combustion exhaust blower is a
variable speed blower controlled by the
heat output button. This blower will
decrease the vacuum pressure inside the
stove and as the heat output button is
turned down. The vacuum pressure inside
the firebox will increase as the combustion
exhaust blower increases in speed (higher
heat output setting).
Figure 29: Efficient Flame.
IMPORTANT: Taking a reading of vacuum pressure inside the firebox with a magnehelic gauge should
be used to set the slider for best combustion. The slider damper should be set only on a hot stove
(operating for thirty (30) minutes or more) by using a Magnahelic Pressure Gauge to measuring the
pressure in the firebox. The best settings are a reading of approximately 0.11 0.12 inches of
water column (27.4 - 29.9 Pa) on the high fire setting. Some fuels may require higher or
lower settings. The reading can be taken from the 1⁄8” (3 mm) hole located on the front of the unit
below the ash shelf.
The easiest way to make sure that an efficient flame is achieved is
to understand the characteristics of the fire.
• A tall, lazy flame with dark orange tips requires more air – Open
slider (pull out) slightly.
• A short, brisk flame, like a blowtorch, has too much air – Close
slider (push in) slightly.
• If the flame is in the middle of these two characteristics with a
bright yellow/orange, active flame with no black tips then the
air is set for proper operation (see Figure 29).
SPECIAL NOTES:
Pellet quality is a major factor in how the Pellet stove will operate. If
the pellets have a high moisture content or ash content the fire will
be less efficient and has a higher possibility of the fire building up
and creating clinkers (hard ash build-up).
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