Page 6 of 17
DAKA Furnace Model 622
2008 Edition
Rev 2B: 11-9-12
IV. WIRING INSTRUCTIONS
– See FIG. 6 & 6A for Wiring Schematic
NOTE: For power supply connections, use No. 14 AWG or larger wires
acceptable for at least 105°C. Shut Off All Power While Installing.
A. Attach approved conduit carrying 3-wire 120V AC 15 amp service to any unused
knockout hole on J-box ring with conduit connector (not included for field wiring
connections).
B. Make all wiring connections per the schematic in FIG. 6 & 6A, making all
connections shown with wire nuts provided. Check all wiring connections for
tightness and electrical safety.
C. Tuck all wires into J-Box Ring, and install Transformer/Relay as J-Box cover.
Reinstall cover plates on blower junction boxes.
V.
CONNECTIONS TO DUCTWORK
A.
For Use As A Supplementary "Add-on" Furnace
– See FIG. 1
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. See FIG. 1 & FIG. 5 for illustration of placement.
1.
Mark and cut out two 8" round holes in the side of the supply (warm air) plenum
of the primary furnace.
IMPORTANT: Verify beforehand that sufficient clearance is available above
air conditioner coils, etc. If sufficient clearance is not available, air
conditioner coil may have to be moved to a second plenum with diversion
baffles for summer use.
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.
