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Damper Maintenance
Greenheck's dampers are designed to be trouble free and hassle free under normal operation. Dampers are to be
installed square and straight so as to prevent binding during operation. The following annual damper maintenance
suggestions will help ensure proper operation and increase the life expectancy of the damper.
Foreign Matter
Moving Parts
Closure
Operation
Actuator
Damper Trouble Shooting
The following is a cause and correction list for common concerns with the damper
Problem
Damper does not move
Over the course of time, dire, and grime may collect on damper surfaces.
The damper surfaces should be cleaned to prevent hindrance to airflow
Make sure that parts such as linkage, bearings, blades, etc. that are
intended to move freely, can do so. Lubricating these components can
prevent possible rusting and unnecessary friction increase. Use only a
molybdenum spray oil or similar graphite based oil on sleeve bearings as
regular lubricating oil will attract dirt.
Bearings. Synthetic, oil impregnated, carbon sleeve, and ball bearings
(without grease fittings) do not require lubrication. Ball bearings with grease
fittings should be lubricated as follows:
Maximum Duct
Temperature
°F
°C
250
121
600
316
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 yearly and replace as necessary.
Axle Seals. Inspect and adjust as necessary.
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.
Cycle test actuator per manufacturer's recommendations.
Possible Cause
No power to actuator
Actuator failed
Actuator attempting to rotate in wrong
direction
Linkage/coupling failed
No modulating signal
Damper linkage failed
Obstruction in damper linkage or inside
duct
Lubricant
NLGI Grade 2 lithium
12-hydrostearate grease
Hi temperature synthetic,
Mobilith SHC100 or equal
Verify presence of correct power to actuator
Power actuator independently of damper
Check wiring. Run actuator independent of damper if
necessary.
Inspect coupling, keys, and connecting linkage for
failed or broken components. Replace as required.
Verify presence of modulating signal. Verify signal is
compatible with actuator.
Verify if signal is driving actuator in the correct
direction
Inspect damper for failed clevis pins, clevises, or
crankarms and replace as necessary.
Inspect for projecting mounting bolts, debris inside
damper and remove.
Minimum Frequency
twice a year
four times a year
Solution
HTD Series
3
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