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High Altitude Adjustment
Installation at high altitude locations (above 2500'),
makes it necessary to compensate for the thinner air
(less volume of air per cubic foot). Higher altitudes
affect the atmospheric pressure and heat value of
some gaseous fuels. The Allagash DVII requires
adjustment for Propane fuel at high altitude, but not
for Natural gas.
In the U.S.
THE DERATING KIT MUST BE INSTALLED BY AN
AUTHORIZED SERVICE TECHNICIAN IN ACCORDANCE
WITH THE MANUFACTURERS INSTRUCTIONS AND ALL
CODES AND REQUIREMENTS OF THE AUTHORITY
HAVING JURISDICTION. THE INFORMATION STICKER
MUST BE FILLED OUT BY THE INSTALLER AND AD-
HERED TO THE APPLIANCE AT THE TIME OF THE
CONVERSION. THE QUALIFIED SERVICE AGENCY
PERFORMING THIS WORK ASSUMES RESPONSIBILITY
FOR THIS DERATING.
For installations from 610 - 1370 meters (2000-
4500 ft.) the orifice size for natural gas is #38 and for
propane gas #54.
SEE THE HIGH ALTITUDE ORIFICE CHART ON THIS
PAGE.
See the stove Rating Plate for additional informa-
tion. For high altitude installations consult the local
gas distributor or the authority having jurisdiction for
proper rating methods. If the installer must convert
the unit to adjust for varying altitudes, the informa-
tion sticker must be filled out by the installer and
applied to the appliance at the time of the conversion.
In Canada:
This unit has been tested for installation at high
altitudes in accordance with Canadian test standard
CAN/CGA-2.17.
THE DERATING SHALL BE CARRIED OUT IN ACCOR-
DANCE WITH THE REQUIREMENTS OF THE PROVIN-
CIAL AUTHORITIES HAVING JURISDICTION AND IN
ACCORDANCE WITH THE REQUIREMENTS OF THE
CAN1-B-149.1 AND .2 INSTALLATION CODE.
ALWAYS TEST PRESSURES WITH VALVE CONTROL KNOB
SET ON HIGH.
The appliance must be isolated from the gas
supply line by closing its individual manual gas shutoff
valve (gas cock) during any pressure testing of the gas
supply piping system that is equal to or exceeds
pressures of 1/2 psig. (3.5 kPa).
Derating Procedure
To derate this unit, install the appropriate orifice per
the High Altitude chart.
1. Remove the two ¼ hex head screw that holds the
burner tube/log support to the bottom of the
stove.
2. Remove the burner tube/log support to expose the
main burner orifice.
3. Remove the orifice and replace with the appropri-
ate one from the high altitude kit.
4. Be sure to attach the high altitude conversion
sticker provided with the kit to the rating plate on
the appliance.
Figure 17. High Altitude Conversion Label. This sticker is
included in all high altitude kits and must be applied to
the stove when converted for high altitude .
THIS STOVE HAS BEEN CONVERTED FOR USE AT
AN ALTITUDE OF: ___________
Orifice Size: __________ Manifold Press. _____
Input Btu/Hr. _________ Fuel Type __________
Date of Conversion ___________
15
High Altitude Orifice Chart
Elevation Fuel Part No.
0 - 2000 ft. Natural Gas #38 129130
(0 - 610 m) Propane 1.5 mm 129146
2001 - 4500 ft. Natural Gas #38 Do Not Derate
(611 - 1370 m) Propane #54 754517P
Orifice
Size