Figure 29: Slider/Damper Adjustment
Damper
Figure 30: Efficient Flame.
Damper Set-up:
DAMPER MUST BE SET AT TIME OF INSTALLATION
This is used to regulate the airflow through the pellet stove, this is
key to an efficient clean burn. See figure 29.
If the pellets being burnt are of poor quality there is a higher
chance of clinker build up and over time the fire may build
up and overflow the burn pot. Poor quality pellets will require
more primary air to help complete the burn, the slider damper
must be pulled out to compensate. Pulling the slider damper
out gives the fire more air. It is crucial to make sure the
burn pot is clean and that no holes are blocked for proper
combustion. It is recommended to get the stove hot then set
the damper at heat level 1, this is the most sensitive setting.
There are two ways to set the damper. You can visually set
the damper if you have experience.
guIDelIneS for fIne-tunIng for fuel QualIty:
Due to fuel quality the slider damper and control board trims may need to be fine-tuned.
1. If the unit builds up on all settings, the slider damper rod should be pulled out in small increments to
give the unit more air.
2. If the unit has excesses ash build-up in the liner on the lower feed settings, the Combustion Blower
Trim should be increased one setting at a time until the problem improves (Factory Setting is #2).
3. If the fire is going out on low because the airflow is too great, the Combustion Blower Trim can be
lowered to the #1 setting.
4. If the stove has excesses ash build-up in the liner on the higher settings the Feed Rate Trim should be trimmed down a
setting at a time until the problem improves (Factory setting is #4).
Figure 31: Magnehelic Test Hole.
• 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, refer to Figure 30.
Preferred Method:
For less experienced installers or owners a magnehelic
gauge can be used to determine the proper Damper setting.
A magnehelic gauge will accurately measure the pressure
in your firebox. There is a small hole on underneath the
door on the right side of the firebox front, see figure 31.
You want a reading of .10-.13 WC (25-32 Pa) depending
on pellet quality.
The combustion exhaust blower is a variable speed blower controlled
by heat level setting. This blower will decrease the vacuum pressure
inside the stove as the heat level output is decreased.
GF40 Freestanding Pellet Stove | 23
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operating instructions
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