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SUPPLEMENTARY / CENTRAL
WOODBURNING FURNACE MODEL 621
DAKA Corporation • 955 Industrial St NE • Pine City, Minnesota • 55063
Phone (320) 629-6737 • Fax (320) 629-3677 • www.dakacorp.com
INSTALLATION AND OPERATION INSTRUCTION MANUAL
NOTE:
This model has been tested and listed in accordance with Underwriters
Laboratories standard UL 391-2010-March 2010 and Sept. 2010 for Solid
Fuel Central and Supplementary Furnaces by Warnock Hersey
International, Inc. ICBO Report No. TL116; NER Qa219.
PRINCIPLE OF OPERATION:
This furnace model is designed for conventional up flow residential central forced air
heating systems, to be installed in either of the following ways:
Supplementary "Add-On" Furnace Application (See FIG. 1)
1.
As a supplementary furnace, this model is connected in parallel to a conventional
primary furnace system, using present ductwork to distribute wood-heated air
throughout the home. As long as the heat produced by the supplementary furnace
keeps the living area temperature above the setting on the primary furnace wall
thermostat, the primary furnace should not burn any gas, oil or use any electricity
beyond that required to run the primary distribution blower. Should the wood fire
fail to provide sufficient heat, however, the primary furnace will begin operating as
usual.
2.
Central Furnace Application (See FIG. 2)
This furnace also may be used as a freestanding central furnace, with its own
plenums and ductwork. The 550-cfm blower provided with this furnace is often
sufficient to provide air distribution for average size homes with relatively normal
size duct runs. NOTE: A second single No. 273 550-cfm blower can be added to
the back of the DAKA 621 to increase airflow or a No. 218 side mounted, multi-
speed blower may be required for larger homes with longer ductwork. Order online
at www.dakacorp.com or call 1-800-884-3252. As wood burning requires periodic
attention, use of this unit as a central furnace is somewhat inconvenient and re-
quires a second heating system (electric baseboard, vented gas room heaters,
etc.) to act as a backup.
Page 1 of 15
DAKA Furnace Model 621
November 2009 Edition
Revision 2: 7-20-12
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Summary of Contents for DAKA 621
- Page 1 NOTE: A second single No. 273 550-cfm blower can be added to the back of the DAKA 621 to increase airflow or a No. 218 side mounted, multi- speed blower may be required for larger homes with longer ductwork. Order online at www.dakacorp.com or call 1-800-884-3252.
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Page 2: Cautionary Notes
6. This furnace must be installed on a non-combustible floor surface such as concrete or 3/8" asbestos millboard. This surface must extend at least 16" in front and 8" to side of DAKA furnace, under the chimney connector and at least 2" to each side of connector. Clearances to combustible surfaces are: To side wall: 18"... - Page 3 If creosote has accumulated it should be removed to reduce the risk of a chimney fire. Use of a smoke vent thermometer to monitor stack temperature is recommended. Page 3 of 15 DAKA Furnace Model 621 November 2009 Edition Revision 2: 7-20-12...
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Page 4: Installation Instructions
F. Install 550-cfm blower (14) on back of furnace using four No. 12 x ½" screws provided. G. Furnace is shipped with air jacket already fitted and installed. If it has worked loose during shipping or unpacking, do the following: Page 4 of 15 DAKA Furnace Model 621 November 2009 Edition Revision 2: 7-20-12... - Page 5 NOTE: SUPPLY PLENUM MUST BE METAL! A back draft damper must be installed in the warm-air supply plenum of the primary furnace below the point where the warm air ductwork connection from the DAKA furnace enters the plenum. Actual design and installation procedure for such a back draft damper is left to the installer, due to the large number of plenum configurations involved.
- Page 6 DAKA furnace. If space prohibits installation of 90 elbow as recommended, see FIG. 5 for alternate designs. Connect cold air return 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.
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Page 7: Operating Controls
An optional fan control may need to be located in supply plenum to turn primary blower on and off when heat is received from the DAKA furnace. See FIG. 1 for fan control location. IMPORTANT: Normal operation will produce flue gas temperatures in the 300°- 600°F range. - Page 8 5. The air jacket top and side may be removed to provide more radiant heat to help cool the firebox. CAUTION: DO NOT expect the DAKA furnace to keep the house as warm during a power failure as when power is on. Do no attempt to increase heat output by opening ash door or fire door.
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Page 9: Troubleshooting
C. DAKA Furnace Blower The rear blower on your new DAKA Furnace Model 621 has permanently lubricated bearings. Re-lubrication is NOT required. Vacuum away dust and dirt on motor air inlets and also on blower impellers at least once each season. - Page 10 Customer Service Department DAKA Corporation 955 Industrial St. N.E. Pine City, MN 55063 (320) 629-6737 (Monday-Friday 8 AM-4:30 PM CST) LEARN MORE ABOUT DAKA FURNACES BY VISITING WWW.DAKACORP.COM Order Optional Accessories Order Replacement Parts Watch Videos on Installation, Operation & Maintenance...
- Page 11 Minimum 12” Round Cold Air Return Pipe Connected To Filter Box Inlet FIG. 2 – Typical Independent Central Furnace Installation NOTE: Supply plenum must be metal. EXAMPLE Page 11 of 15 DAKA Furnace Model 621 November 2009 Edition Revision 2: 7-20-12...
- Page 12 Flue to sidewall: 27” Furnace to back wall: 32 ½” Flue to back wall: 23” Furnace to front wall: 48” Sides of DAKA furnace to primary furnace: 9” FIG. 4A FIG. 4B Dimensions shown are minimum distances to stay clear from Dimensions shown are minimum combustible walls.
- Page 13 FIG. 5 – Alternative Warm Air Plenum Pipe Insert Designs FIG. 6 – Wiring Schematic Page 13 of 15 DAKA Furnace Model 621 November 2009 Edition Revision 2: 7-20-12...
- Page 14 Hex Nut, ¼ for ash pan door HN14 A = Large Parts Bag #36205 B = Small Parts Bag #36210 All other parts are separate components Page 14 of 15 DAKA Furnace Model 621 November 2009 Edition Revision 2: 7-20-12...
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Page 15: Limited Warranty
DAKA will repair or replace defective components, at our option, at no charge for parts and labor, and will pay freight charge for one-way shipment for warranty claims during first year.
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