Jack BIG BJ90 Owner's Manual - page 9
REDUCED CLEARANCES
Up to 50% less clearance between combustible walls and chimney
connector to furnace and ducts is allowed if insulated according to
NFPA Standard 90B or your local building code. This copyrighted
book is available from the National Fire Protection Association Inc.
1 Batterymarch Park, Quincy, MA. 02169-7471. Phone orders:
1-800-344-3555. Their internet address is www.nfpacatalog.org.
It is a mistake to assume that sheet metal, masonry, or asbestos-
like board placed directly against a wall protects it. Materials
installed in this manner give very little protection. These materials
are good conductors, so they will be almost as hot on their back-
side as well as on their exposed side. Therefore, the combustible
wall behind it is still a fire hazard.
CAUTION
Do not use any smoke pipes less than 24 gauge between
furnace and chimney.
CONNECTING SMOKE PIPE
Set the smoke pipe end of the furnace as close to the chimney as
possible. For every foot of lateral pipe, the rise of the smoke pipe
toward the chimney must be at least one inch. Do not exceed 10
feet in length. A cleanout tee should be installed for removal of
soot and fly ash.
Do not install the smoke pipe longer than necessary to reach the
chimney for purposes of trapping heat. The smoke outlet temper-
ature is designed so that the heat emitted is needed to carry the
by-products of combustion out through the chimney.
The smoke pipe must not pass through any combustible material.
The smoke pipe entrance into a masonry chimney should be at
least 2 feet above the cleanout. The smoke pipe must not extend
into the chimney beyond the inner face of the chimney liner.
WARNING
Check your chimney. The chimney is a very important part of
your heating system. It must be the right size, properly con-
structed and in good condition. No furnace can function prop-
erly with a bad chimney. The chimney must supply a draft of
.03 Water Column. If possible, use a 15 foot or higher chim-
ney. Add an additional foot to the chimney for each 1,000 feet
of elevation above sea level.
PROPER CHIMNEYS
The National Fire Protection Association (NFPA) requires that all
factory built chimneys be Listed and installed in accordance with
conditions of the Listing in the manufacturers instructions. NFPA
also requires that your chimney extend at least three (3) feet
above the highest point when it passes through the roof and at
least two (2) feet higher than any portion of the building within ten
(10) feet of the chimney.
Factory built chimneys must be what NFPA refers to NFPA 211 1-
5.217.4 as Type HT. HT is an abbreviation meaning High
Temperature.
Masonry Chimneys as referred to in NFPA 211 1-5.2.17.6, a field
constructed chimney of solid masonry units, bricks, stones, listed
masonry chimney units, or reinforced concrete that is lined with
suitable chimney flue liners and built with the provisions of Chapter
4 of this standard.
DO NOT CONNECT THIS FURNACE TO A
CHIMNEY SERVING ANOTHER APPLIANCE
WARNING
Return air MUST NOT be drawn from inside the room
where the furnace is located.
FURNACE CASING
1. The furnace is shipped unassembled in a carton attached to
the furnace.
2. Insert the left and right side panels into the slots at the base
of the furnace.
3. Place top panel over the front edge of the furnace and then
into the side panels.
9
MOUNTING THERMOSTAT & SUB-BASE
Thermostat must be mounted on an interiior, centrally located wall
away from direct sunlight and drafts and approximately 5 feet
above the floor.