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Modulating Unitary Range
VA-LT206_11292016al
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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.
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•
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.
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•
Note:
In order to obtain smoothly sealed coupling liners, tighten each of the coupling bands
progressively and alternately. Tightening one band completely before the other may result in an
undesirable wrinkle in the liner (refer to Figure 11).
DO NOT over torque the coupling. (Torque coupling to 15-25 lb
f
-ft).
WHEN INSTALLING, ORIENT
BAND CLAMP LOCK BOLTS
TO TOP, AT 10 O'CLOCK
OR 2 O'CLOCK POSITION TO
AVOID CONTACT WITH THE
REFLECTOR
TUBE WELD
SEAM
TORQUE TO 15-25 FT.-LBS
INSTALLATION OF TUBE COUPLING
REFLECTOR
HANGER
INSTALL "J" BOLT AT THE
FIRST HANGER ONLY
TUBE WELD
SEAM
PLACE TUBE IN THE
REFLECTOR HANGER
AS SHOWN
INSTALLATION OF REFLECTOR HANGERS
AND "J" BOLT
Figure 11: “J” Bolt and Coupling Installations
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Continue placing tubes, couplings and reflectors to complete the heater assembly. Ensure heat
exchanger sections line up straight. Couplings should be tightened as heat exchanger is placed, since
it is more difficult to do so once the reflector is in position.
INSTALLATION
