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Two Stage Unitary Range
DU/DUH-LT210_10152019al
INSTALLATION
•
Tighten the cradle loops of the first hanger with the "J-Bolt" found in the burner box, to snugly hold the
combustion tube from rotating see Figure 11.
•
Note:
For all coupling joints, ensure that the tube joint is in the center of the coupling length, and that
the overlap joint of the coupling is above the centerline of the tube. Also ensure that the weld seam on
ALL tubes is facing down.
•
Note:
In order to obtain smoothly sealed coupling, tighten each of the nuts progressively and
alternately. Tightening one nut completely before the other may result in an undesirable wrinkle in the
coupler (refer to Figure 11).
DO NOT over torque the coupling. (Torque coupling to 15-25 lb
f
-ft).
TORQUE TO 15-25 FT.-LBS
WHEN INSTALLING,
ORIENT COUPLING
LOCK BOLTS TO TOP,
AT 10 O'CLOCKOR 2
O'CLOCK POSITION TO
AVOID CONTACT WITH
THE REFLECTOR
REFLECTOR
HANGER
INSTALLATION OF REFLECTOR HANGERS
AND "J" BOLT
TUBE
WELD
SEAM
TUBE
WELD
SEAM
PLACE TUBE IN THE
REFLECTOR HANGER AS
SHOWN
INSTALL "J" BOLT
TO TIGHTEN
CRADLE LOOP AT
FIRST HANGER
ONLY
COUPLING INSTALLATION
MOVING BETWEEN THE
FOUR BOLTS, TIGHTEN
EACH, ENSURING THAT
EQUAL PRESSURE IS
APPLIED TO EACH SET PIN
IN TURN.
INSTALLATION OF TUBE COUPLING
IMPORTANT: COMPLETE ASSEMBLY BY DRILLING AND
SCREWING SELF TAPPING RETENTION ZIP SCREWS.
Figure 11: "J" Bolt and Coupling Installations
•
Continue placing tubes, couplings and reflectors to complete the heater assembly. Ensure heat exchanger
sections line up straight. Couplings should be tightened as the heat exchanger is placed, since it is more
difficult to do so once the reflector is in position.
Note:
It is recommended that the equipment be installed with a downward slope, away from the burner. The rate
of declinations should be 1/4" (6mm) in height per 10' (3m) in length to allow the start-up condensation to drain.
Summary of Contents for DU-100
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