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DAKA Furnace Model 621
November 2009 Edition
Revision 2: 7-20-12
2.
Attach each 90
°
sheet metal elbow to one end of straight 8" pipe. Insert elbow
into supply plenum of primary furnace with outlet pointing upward. Slip collar
over straight end of 8" pipe and push up tight against supply plenum for a good
air seal. See FIG. 1 & FIG. 5.
IMPORTANT: The 90
°
elbows within the supply plenum forms a venturi to
extract air from DAKA furnace when primary furnace blower comes on. An
absence of these elbows will cause backpressure down the warm air pipe to
the DAKA furnace, adversely affecting heat distribution, and possibly
damaging the DAKA furnace. If space prohibits installation of 90
°
elbow as
recommended, see FIG. 5 for alternate designs.
3.
Connect cold air retur
n of primary furnace to DAKA filter box using a minimum 10”
diameter pipe.
NOTE: After attaching warm and cold air supply and return pipes to
primary furnace, check entire system to insure that static pressure remains
unaffected. Verify horizontal duct clearances (see FIG. 3).
B.
For Use As A Central Furnace
– See FIG. 2
1. Install a minimum 16" x 16" plenum (PLENUM MUST BE METAL) on air jacket
top with tin snips or sabre saw as needed, using starting collar to attach.
2. Install ductwork with proper clearances to combustibles in accordance with local
building codes.
3. Make sure to connect a cold air return line to the blower that was supplied with
your new DAKA Model 621.
VI. CONNECTING DAKA FURNACE TO CHIMNEY
Mount and secure 6" non-galvanized smoke pipe, 24-ga. or heavier, to rear
smoke outlet on DAKA furnace. Continue same gauge single-wall pipe to
chimney connection, with following safety rules in mind:
1. A barometric regulator should be installed in smoke pipe at least 18" from
furnace, to permit adjustment of chimney draft to a maximum of .06" water
column draft. Barometric Regulator No. 283 with adjustable draft setting is
available through DAKA for this purpose.
2.
Smoke pipe should maintain a minimum 18" clearance to all combustibles
and should never pass through walls or ceilings. Use proper thimbles for
those passages.
3. Heat reclaimers, fins or the like should not be used on smoke pipe, as they tend
to cool flue gases and add to creosote formation on stoves and furnaces of
advanced airtight design.
4. All joints of chimney connector pipe should be secured with a minimum of three No.
7 sheet metal screws & further sealed with furnace cement to maintain good draft.
