United Enertech CR User manual

3 x Duct Dia.
Duct
Dia.
Duct
Dia.
Duct
Dia.
Duct
Dia.
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Model CR
Use and Operation:
The CR damper is a device that responds automatically to duct pressure changes to regulate airflow in supply or exhaust applications.
The damper adjusts the amount of free area thereby controlling constant velocity and airflow.
Installation:
1. CR Dampers may be installed either in horizontal or vertical round duct. If installed horizontally, the BAS marking must face downward.
2. Device to be installed in register boxes, rigid ducts, or duct collars through a friction fit caused by the rubber gasket. The gasket
also creates an air seal. DO NOT USE FASTENERS TO INSTALL THIS PRODUCT.
3. If installed in an intake position, the damper must be set back at least three times the duct diameter from intake grilles. The damper
must also be set back at least three times the duct diameter from duct connections, duct bends, or other places with turbulent air.
4. If installed in an exhaust position, the damper must be set back at least the distance of the duct diameter from exhaust grilles. The
damper must also be set back the distance of the duct diameter from duct connections, duct bends, or other places with turbulent air.
5. Install with future access for removal or inspection.
6. Avoid using fasteners in the duct where the damper is placed to prevent
ineffective operation and damage.
7. Avoid contact between the damper and gypsum board duct.
8. Install in accordance with necessary mechanical and building codes.
9. Install dampers following the correct airflow direction of the duct.
Flex
Duct
Duct Collar / Grille
CR
Damper
Register Box
/ Rigid Duct
CR Damper
Flex
Duct
(Constant Airflow Regulator)
BAS
Marking Down
Airflow
Airflow
3 x
Duct
Dia.
Duct
Dia.
Duct
Dia.
Flex
Duct
Duct Collar / Grille
CR
Damper
Register Box
/ Rigid Duct
CR Damper
Flex
Duct
BAS
Marking Down
Airflow
Airflow

Maintenance:
The CR Damper requires relatively minimal maintenance. However, if the device is installed
in a filterless exhaust application, maintaining access for future cleaning and inspection is
recommended. To clean the damper, remove the damper, wash it with soap and warm
water, dry the damper, and reinstall the product.
Issues and Solutions:
If Airflow is too Low:
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Model CR
(Constant Airflow Regulator)
Damper too close to fan; separate the two with a manual damper to lower pressure
through CR Damper, or move damper further away from fan.
Wrong CR Damper installed; check CFM requirements against damper label, replace
or adjust airflow rate if necessary.
Damper operating incorrectly; check damper for damage and replace if necessary.
Duct pressure too low; increase fan speed or replace fan if necessary.
Duct air leakage too high; seal any gaps with tape.
If Airflow or Noise is too High:
Damper operating incorrectly; check damper for damage and replace if necessary.
Wrong CR Damper installed; check CFM requirements against damper label, replace
or adjust airflow rate if necessary.
Duct pressure too high; decrease fan speed if necessary.
Adjustments:
CR Dampers have an airflow adjustment range, controlled with a bit Torx T10. To change the
airflow rate, unscrew the set screw and slide the damper section of the regulator up or down
as needed.
Lower Airflow Rate
Higher Airflow Rate
Airflow Adjustment