Instruction manual

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Page 1 of 15 DAKA Furnace Model 621 November 2009 Edition

Revision 1: June 2011

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 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:

1. Supplementary "Add-On” Furnace Application (See FIG. 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 1580-cfm side mounted

blower may be required for larger homes with longer ductwork. Call 1-800-884-

3252 to order. As wood burning requires periodic attention, use of this unit as a

central furnace is somewhat inconvenient and requires a second heating system

(electric baseboard, vented gas room heaters, etc.) to act as a backup.

Summary of content (15 pages)

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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 for Solid Fuel Central and Supplementary Furnaces by Warnock Hersey International, Inc. ICBO Report No. TL116; NER Qa219.
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CAUTIONARY NOTES: 1. This furnace is designed for use only in conventional up flow systems and must deliver heated air to a supply (warm air) plenum – never to ductwork. The warm air supply from this furnace must never be connected to the cold-air return inlet of a central primary furnace, as a possibility exists of components of the central furnace overheating and causing the central furnace to operate other than as intended. 2.
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9. This furnace has been designed to operate with a maximum warm air duct pressure of 0.2" water column and a maximum warm air duct temperature of 200°F. When used in a supplementary "add-on" mode, check the nameplate on the primary furnace to determine compatibility. 10.
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INSTALLATION INSTRUCTIONS: I. UNPACKING Remove all component parts from firebox for assembly; check piece count against parts list on page 14 of this manual. NOTE: Remove firebrick from carton while still within firebox. Do NOT attempt to lift full carton.) Parts shortage: If carton was sealed when purchased, call or write factory immediately. Provide model number and serial number of furnace, found on front mounted data plate, along with a description and quantity of missing parts.
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1. Remove air jacket top (15) by lifting up from front to back only, not side to side. 2. Ensure that bottom air jacket panel (16) is fully seated between lower bottom support angles. 3. Ensure that channels welded on air jacket sides (17) engage the lower support channels, and that the side panels are pressed tightly onto furnace around the front and back corners. 4. Reinstall the air jacket top from back to front, making sure that all top edges of each of the air jacket sides are inside of top. 5.
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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.
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5. Smoke pipe should normally be installed with male ends leading from chimney to furnace; should runny creosote be formed in chimney connector, it will then return through pipe to furnace without dripping out of joints. 6. Maintain a minimum of 1/4" per foot of pipe rise to chimney connection; the steeper the rise, the more easily draft will be maintained, generally. 7. Avoid the use of 90° elbows in any chimney connector, as they adversely affect draft.
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overheating, which could cause severe warpage or breakage. 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. B. In Case of a Chimney Fire: 1. Call the fire department immediately. 2. Reduce room thermostat to lowest point to shut off auto dampler.
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IX. MAINTENANCE OF YOUR DAKA FURNACE A. Fueling Procedure Fill with cordwood (and/or coal, if applicable) to the top of the firebrick. Before burning coal, you must have a coal burning grate and a fire door equipped with a spin draft (available from dealer or direct from the factory). B. Flue Pipe and Chimney These must be checked frequently during heating season, and deposits of soot and creosote over 1/8" thick removed using stiff-wired brushes designed for the job.
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C. Problem: Paint Discoloration (whitish appearance) Solution: Paint is rated for 900°F surfaces, and overheating of furnace will cause a whitish appearance on outside of combustion chamber surfaces; reduce chimney draft to control overheating. NOTE: To cover discoloration, obtain a high-temperature flat black spray paint from hardware or fireplace shop. If problems persist, or help is needed in installation or operating of furnace, contact: Customer Service Department DAKA Corporation 955 Industrial St. N.
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FIG. 1 – Typical Installation As Supplementary “Add-On” Furnace NOTE: Supply plenum must be metal. Primary Furnace Warm Air Plenum EXAMPLE 6” Minimum Listed Type HT Chimney serving DAKA Furnace Only Cold Air Return 90° Elbows installed inside plenum (See FIG.
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FIG. 3 – Clearances from Horizontal Warm Air Ducts From Sides and Top of Warm Air Plenum – 6” From Horizontal Ducts within 6 Ft. of Plenum – 6” From Horizontal Ducts beyond 6 Ft. of Plenum – 0” FIG. 4 – Clearances to Combustibles & Flooring Wall Clearances to Combustibles: Furnace to sidewall: 18” Flue to sidewall: 27” Furnace to back wall: 32 ½” Flue to back wall: 23” Furnace to front wall: 48” FIG. 4A FIG. 4B Dimensions shown are minimum distances to stay clear from combustible walls.
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FIG. 5 – Alternative Warm Air Plenum Pipe Insert Designs FIG.
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4 7 KEY No. Part Description 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23.
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LIMITED WARRANTY DAKA Corporation warrants the combustion chambers of its supplementary furnaces to be free of defects in material or workmanship for five years from date of sale; all other components, including electronics, gaskets and grates are covered in the same manner for a period of one year. 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.