COOK Laboratory Exhaust - Manual (Page 16)

7.0 Dampers
With the custom design nature of the Loren Cook equipment, your unit may contain outside air, supply air, return
air, exhaust air, face, by-pass isolation or any other type dampers in various configurations. Be sure to review the
contract submittal and sequence of operation in order to fully understand the operation of your equipment.
Caution: Dampers, operators, controls, and linkage must be checked prior to applying power to the
operators to ensure that nothing will obstruct the operation of the dampers. Do not over-
drive damper operators as this may cause damage to the dampers.
7.1 Fresh Air, Return Air and Exhaust Air Damper Motors
One or more damper motors operate outside air, return air, and exhaust air dampers which function in response
to mixed air thermostat or through mixed air lock-out to minimum position. Spring return on damper motors close
outside air dampers, close exhaust dampers, and opens return air dampers when there is no power to the
motors.
7.2 Damper Maintenance
The damper is a component that is engineered to give years of trouble-free operation, but as with any
mechanical device, some maintenance is required. A regularly scheduled inspection including the following items
should be made to maximize the damper assembly life and keep leakage at a minimum.
1. The motor operates the load properly.
2. The motor responds properly to the controller.
3. The motor returns the damper to the starting position whenever power to the motor is interrupted.
4. There is no binding or stalling of the motor as the motor travels through its entire range.
5. Check all linkage for binding and confirm free travel.
6. Check all bolts on side linkage for tightness.
7. Check side seals for wear and or deterioration, replace if required.
8. Check side seals for build-up of dirt and other matter, clean if required.*
9. Check blade seals for all dirt accumulation, wear and or deterioration, clean or replace if required.**
* Side seals maybe cleaned with soap and water or mineral spirits depending on the composition of the build-
up. "Goof Off" marketed by Atlanta Sundries and available at many hardware stores, is an excellent clearer
for this purpose.
** Blades and seals should be cleaned with soap and water only.
Notes: 1. To simplify checkout procedure, it is suggested that an auxiliary potentiometer be substituted
for the controller. This may be obtained through your local controls supplier.
2. The applicable MSDS sheet should be read and understood prior to using cleaning
chemicals.
3. Items 4 and 5 should be checked during initial run in period, because of the presence of
construction dust and material in the air stream.