Jack SUPER SJ125, Owner'S Manual

Page: 35 / 56

Species
Pound
Weight
Per Cord
BTU’s
per Cord
Air Dried
Wood
Equivalent
Value #2
Fuel Oil
Gallons
Hickory 4,327 27,700,000 198
Apple 4,100 26,500,000 189
White Oak 4,012 25,700,000 184
Beech 3,757 24,000,000 171
Red Oak 3,757 24,000,000 171
Sugar Maple 3,757 24,000,000 171
Yellow Birch 3,689 23,600,000 169
White Ash 3,689 23,600,000 169
Tamarack 3,247 20,800,000 149
Paper Birch 3,179 20,300,000 145
Cherry 3,121 20,000,000 143
Elm 3,052 19,500,000 139
Black Ash 2,992 19,100,000 136
Red Maple 2,924 18,700,000 134
Box Elder 2,797 17,900,000 128
Black Spruce 2,482 15,900,000 114
Ponderosa Pine 2,380 15,200,000 109
Aspen 2,290 14,700,000 105
Cottonwood 2,108 13,500,000 96
BEST WOOD TO BURN
All solid fuel, whether it is coal, pine, oak or any grain
has about 12,000 BTU's per pound if its moisture
content is zero. Wood that has been cut, split and air
dried for 2 years has about 8,000 usable BTU's per
pound. Hardwood such as oak or hard maple has
nearly twice the BTU's per cord as pine or aspen
because it is nearly twice as heavy.
Freshly cut wood has about 50% moisture content.
Wood that has been cut and split for 2 years has about
20%. Wood must reach at least 435º to ignite. High
moisture content wood does not allow the gases in
wood to get hot enough to provide complete
combustion, thereby creating smoke and creosote,
which is usable energy, but wasted because of
incomplete combustion.
Our Jack furnaces are designed to wring the most
energy possible from each log. Your furnace is
designed to allow the primary air under the grate to
create the initial burning. As the wood burns, gases,
which contain 40% of the energy in the wood, escape
to the top of the flame. The Cast Iron Spinner Disc on
the firing door, when opened 3 full turns, will provide
secondary air to the top of the fire to burn these gases.
The result is you will use up to 75% less wood than
stoves, furnaces or outdoor boilers without this feature.
Questions? Visit www.yukon-eagle.com or call 1-800-358-0060
Operating Instructions
35