Vent Restriction Adjustments - Jøtul GF 370 DV MV Installation And Operation Instruction Manual

130102- 1 GF 370 DV MV 2/22

Vent Restriction Adjustments

The Jøtul GF 370 DV MV features adjustment controls
for both intake air and exhaust to accommodate a variety
of conditions that result from variables inherent in the
vent configuration and environment. Both controls can be
accessed from outside the firebox to allow the burner to be
"dialed-in" under operation. See figures 6.10 and 6.12.
Use the Vent Termination Diagram, fig. 6.13, to
determine which zone your vent termination falls within
and make the appropriate exhaust and air intake setting
adjustments. Use these settings as general guidelines to start
from. The final settings will ultimately be determined by the
individual characteristics of your particular installation.
There are no hard and fast rules.
Exhaust Vent Restriction
Exhaust restriction prevents overly strong draft that can
interfere with pilot function, cause poor combustion or
a weak flame picture. The shutter is set in the fully open
position at the factory. The final position of the restriction
shutter is determined by where the vent termination falls
within the vent window diagram.
For example, if the vent rise is 20 feet and includes one
elbow in a horizontal run of 5 feet, the appropriate exhaust
setting will be Full Restriction.
Top Plate
Pivot Plate
Figure 6.10. The Exhaust Restrictor is located within the vent
adaptor collar.
No
Restriction
Restriction
DO NOT EXCEED THIS SETTING.
OVER-RESTRICTION MAY CAUSE SOOTING.
Figure 6.11. Exhaust Restrictor settings
12
Half Full
Restriction
Exhaust Restrictor Adjustment
1. Remove the Trim Rings from the Top Plate.
2. Loosen the locking screw and turn the restrictor pivot
plate to the appropriate indicator point as specified in the
vent window diagram, figure 6.13. After the burner has
been operating for 15 minutes, make any further adjust-
ment in 1/8" increments until the desired flame picture
is achieved. Do not exceed the fully closed setting as
shown in fig. 6.11.
Operate the burner for 10-15 minutes between addi-
tional adjustments.
3. Tighten the locking screw and replace the Trim Rings.
Intake Air Adjustment
An Intake Air shutter plate allows further burner adjustment
for taller vent runs. It is located under the firebox floor and is
set fully open at the factory. See fig. 6.12.
The shutter has an adjustment range of 1 inch.
To change the setting, loosen the wingnut and slide the
gasketed shutter stem backward to the half or fully closed
positions, depending on which vent zone is appropriate.
Retighten the wingnut before lighting the burner to seal
the gasket. Allow the flame pattern to settle in for 10- 15
minutes between each setting change.
Air Intake Shutter
Stem
Figure 6.12. Air intake shutter location.