Specifications

DAKA 521FB Manual Page 22 of 32 January 2009
Rev. 3, June 2013
X. INSTALLATION
IMPORTANT: In a Supplementary/Add-on installation, the blower on the DAKA furnace is not used as
a circulation blower for heating the house, but as a lift blower to get the heat into the supply plenum.
From there, the primary blower will turn on as heat is received from the DAKA furnace. A fan control
will have to be installed, wiring it in parallel with the primary blower fan control at the heat exchanger
level. See next page for necessary position of this fan control.
NOTE: After attaching warm and cold air supply and return pipes to the primary furnace, check the
entire system to insure that static pressure remains unaffected. Verify horizontal duct clearances.
A.2. CONNECTING TO DUCTWORK (WHEN USED AS CENTRAL FURNACE)
IMPORTANT: Installation of a cold air return line to the DAKA furnace is mandatory.
1. Install a minimum 13” x 20” plenum on air jacket top. You may want to cut top with tin snips or saber
saw to help free up the air flow out of the DAKA furnace.
2. Install ductwork with proper clearances to combustibles in accordance with local building codes.
3. Connect cold air return to No. 260 filter box provided. A twin blower conversion kit No. 273 is
available to increase airflow to 1100-cfm where necessary. This will provide for better heat distribution.
NOTE: The No. 273 twin blower conversion kit requires a No. 258 dual blower cold air return filter box.
Both are available online at www.dakacor.com.
IMPORTANT: The plenums installed to the furnaces must be of metal construction.