Damper jumpers are supplied regardless of the number of motors specified. If a jumper is fitted and two motors are to be utilized, the failure of one motor may prevent the remaining motor from operating both damper sections correctly, or prevent operation entirely.
Note:
Installing Damper Jumpers
VERIFY DAMPER OPERATION
BEFORE INSTALLATION
- Damper must be installed square.
- Damper is approximately ½" smaller than the specified duct size.
- Ensure that the duct is square and/or large enough to allow the damper to be installed square
- Make a hole in the duct work, if required, to allow extension of the drive rod.
- Verify that the damper is square and then secure the bottom frame to the floor of the duct using a 90° mounting angle. Operate the damper manually to confirm proper sealing.
- As each mounting angle is installed, verify operation to ensure the damper is sealing correctly.
- Caulk all joints.
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JUMPER HALVES SHOULD
NOT LINE UP EXACTLY
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Jumper ready to mount to U-bolts
located on the drive blades.
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DAMPER INSTALLATION PROCEDURE
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Jumper halves can be offset for adjustment purposes.
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- Loosen and remove the hex nuts from the U-bolts on both drive blades. (Take care that the U-bolt does not drop out if the damper is installed horizontally.)
- Install the damper jumper as shown on the drawings. Then, replace and tighten the hex nuts. (Insulated dampers must retain the rectangular spacer between the jumper and the blade.)
- Cycle the damper manually and ensure that both sections seal correctly. (Operate by driving the section which is to be directly connected to the motor.)
- If any adjustment is required, loosen both flanged nuts and offset the halves of the jumper so as to allow the section with the actuator to close fully last.
- Re-tighten the flanged nuts and verify damper closure.
- Repeat the adjustment procedure if necessary.
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