Specifications

DAKA 521FB Manual Page 16 of 32 January 2009
Rev. 3, June 2013
IX. ASSEMBLY INSTRUCTIONS
Cast Iron Grate 
INSTALL FIRE BRICK
With everything removed from inside firebox,
install firebrick.
1. To install firebrick, hold firebrick in standing
position and angle top of firebrick toward
outside wall. Slip top edge of firebrick under
retaining angle. Stand firebrick up so bottom of
brick sits evenly on support rail.
2. Center rear firebrick (3) across back of
firebox. Insert sidewall firebrick (5 ea) at front
of furnace. As more are inserted, push brick as
far back as possible towards rear of furnace.
NOTE: There will be a small gap in each back
corner. This is normal and will not adversely
affect operation.
INSTALL CAST IRON GRATE
With reinforcement ribs facing down, insert
grate through fire door opening. Grate must be
held at a 45° degree angle as shown in FIG. 12.
Place one side edge down on support rail.
Drop other side down. Grate should lie flat on
both side support rails.
INSTALL AUTOMATIC DAMPER CONTROL
Remove Automatic Damper Control from
protective wrapping. Remove ¼” bolt and ¼”
nut that were installed in one corner of damper
control for shipping purposes only.
Attach Automatic Damper Control assembly to
front of furnace below the fire door opening with
six (6) No. 12 x ½” screws. Install top corner
screws first. Do not completely tighten until all
six screws have been inserted into holes.
NOTE: To ease installation of screws, use one
drop of motor oil on each screw before
installing. Use a 5/16” nut driver or a 5/16”
socket to install screws. TIGHTEN FIRMLY.
See FIG. 13.
Auto Damper
FIG.
FIG. 12
Grate 
FIG. 13
Auto Damper
Control 