Greenheck HBTR & HCDR Series (469619) - Manual (Page 3)

Damper Troubleshooting
Problem Possible Cause Solution
Damper does not move
No power to actuator Verify presence of correct power to actuator.
Actuator failed Power actuator independently of damper.
Actuator attempting to rotate in
wrong direction Check wiring. Run actuator independent of damper
if necessary.
Linkage/coupling failed Inspect coupling, keys, and connecting linkage for
failed or broken components. Replace as required.
No modulating signal Verify presence of modulating signal.
Verify signal is compatible with actuator.
Verify if signal is driving actuator in the correct
direction.
Obstruction in damper linkage
or inside duct Inspect for projecting mounting bolts, debris inside
damper and remove.
Damper attempts to move
but, does not open fully
Actuator sizing incorrect
(excessive torque required) Verify that correct operating pressures, velocities,
and temperatures were given to manufacturer for
actuator sizing. Replace actuator if necessary.
Obstruction in damper linkage
or inside duct Inspect for projecting mounting bolts, debris inside
damper and remove.
Modulating control not going
full span Verify control signal span from controller.
Actuator travel stops incorrectly
adjusted Some actuators are equipped with mechanical
stops to limit rotation. Adjust as necessary.
Damper with jamb seals
installed with blades vertical Consult factory, for modifications if vertical blade
orientation not specified on damper with seals.
High noise level
Very high velocity/flow Reduce flow through damper.
No seals on dampers Retrofit with blade seals.
Damper not closing fully Readjust actuator or drive linkage to fully close
damper.
The following is a cause and correction list for common concerns with the damper:
Closure Remove foreign materials that may be interfering with blade closure or effective sealing of the
blades with each other or with the frame.
Blade Seals. Inspect annually. Replacement is recommended after 5 years to reduce the
potential of leakage on HBTR series. Damper serial number required when ordering replacement
seal.
Axle Seals. Inspect and adjust as necessary.
Operation While operating the damper through its full cycle, check to see that the blades open and close
properly. If there is a problem, check for loose linkage, especially at the actuator. Tighten the
linkage where required.
Actuator Cycle test actuator per manufacturer’s recommendations.
Damper Maintenance cont....