VENCO ES Series User manual

Table of Contents
General Information ......................................2
Pre-Installation Guidelines .........................1-2
Counterbalance Adjustment ......................2-3
• EM/ES/GM-30, 31, 32 ...........................2
• EM/ES-10, 11, 12 .................................. 3
• EM/ES-40, 41, 42 ...............................3-4
Multiple Section Assembly ...........................4
Receiving and Handling
Upon receiving dampers, check for both obvious
and hidden damage. If damage is found, record all
necessary information on the bill of lading and file
a claim with the final carrier. Check to be sure that
all parts of the shipment, including accessories, are
accounted for.
Dampers must be kept dry and clean. Indoor storage
and protection from dirt, dust and the weather is
highly recommended. Do not store at temperatures in
excess of 100°F (38°C).
This manual is the property of the owner and is required
for future maintenance. Please leave it with the owner
when the jobs is complete.
Safety Warning
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, injury
or death. Read the installation, operating, and
maintenance instructions thoroughly before installing
or servicing this equipment.
Pre-Installation Guidelines
The basic intent of a proper installation is to secure the
backdraft damper into the opening in such a manner
as to prevent distortion and disruption of damper
operation. The following items will aid in completing the
damper installation in a timely and effective manner.
1) Check the schedules for proper damper locations
within the building. Visually inspect the damper for
damage.
2) Lift or handle damper using sleeve or frame. Do
not lift damper using blades, linkage, actuators,
or jackshafting. When handling multiple sections
assemblies, use sufficient support to evenly lift at
each section mullion (see drawing). Do not drag, step
on, apply excessive bending, twisting, or racking.
3) Do not install screws in damper frame that will
Spreader Bar
Attachments
Multi section dampers
interfere with unexposed blade linkage and prevent
damper blades from opening and/or closing.
ES EM GM Series 1
Document 483513
ES, EM, & GM Series
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.

Counterbalance Adjustment
Procedure
The following instructions should be followed when
attempting to maximize the counterbalance effect
on the EM or GM model dampers. Be aware that
when the balance setting is highly sensitive, friction
wear, and contamination will have an adverse effect
to the operation of the damper. The sensitivity of
the counterbalance should only be set to meet the
application requirements. The damper must be mounted
square and plumb and operate freely before any weight
adjustments are performed.
Counterbalance Adjustment for EM/
ES/GM-30, 31, and 32 Models: Vertical
Mount - Horizontal Airflow
There are two different adjustments that can be made:
Adjustment #1: affects the balance of the
blades in the open position. Use this adjustment
method if the damper blades do not achieve full
open position under airflow and you want them
to open further or all the way.
Adjustment #2: affects the balance of the blades
in the closed position along with a small change
to the open position balance.
If the airflow through the damper is light and the blades
only slightly move from the closed position, then
Adjustment #1 and #2 are required.
Adjustment #2: Balance the Blades in the Closed
Position
The damper is assembled with the counterbalance
weights and bracket installed such that, when the
blades are closed, the counterbalance weights and
bracket are positioned directly in-line with the blade
pivot points. This position of the weights will provide a
light load that will hold the blades in the closed position.
To reduce this load, the counterweight mounting
brackets can be bent away from the adjacent blade
surface. Bending the counterweight mounting brackets
will move the counterweight stack behind the blade
pivot point and therefore allow the blades to start
opening at lower airflow rates. This adjustment should
be performed in small increments since the blades will
not fully close if the brackets are bent too far.
Adjustment #1:Balance the Blades in the Open
Position
Moving the weight stack along the length of the
mounting bracket slot will affect the full open balance
of the blade assembly. Moving the weights further
away from the blade pivot point will cause the blades
to become more balanced so that at some point, and
with enough weight, the blades would remain open.
Care must be taken to ensure that when the weights
are moved outward from the blade pivot point they will
not interfere with the adjacent blade when the blades
close. Moving the weights back towards the blade pivot
point will allow the blades to close. If the damper blades
do not open completely and Adjustment #1 has been
addressed, then more weight is required.
4) Damper must be installed into duct or opening square
and free of twist or other misalignment. Damper
must not be squeezed or stretched into duct or
opening. Out of square, racked, twisted or misaligned
installations can cause excessive leakage and/or
torque requirements to exceed damper/actuator
design.
5) Damper and actuator must be kept clean, dry and
protected from dirt, dust and other foreign materials
prior to and after installation. Examples of such
foreign materials include but are not limited to:
a) Mortar dust
b) Drywall dust
c) Firesafing materials
d) Wall texture
e) Paint overspray
6) Damper should be sufficiently covered as to prevent
overspray if wall texturing or spray painting will
be performed within 5 feet (1.50m) of the damper.
Excessive dirt or foreign material deposits on
damper can cause excessive leakage and/or torque
requirements to exceed damper/actuator design.
7) ACCESS: Suitable access (actuators maintenance,
etc.) must be provided for damper inspection and
servicing. Where it is not possible to achieve sufficient
size access, it will be necessary to install a removable
section of duct.
Bend counterweight mounting
bracket away from blades.
Bend Here
ES EM GM Series2

Counterbalance Adjustment for EM/ES-
10, 11, and 12 Models: Horizontal Mount-
Vertical Airflow Up
There are two different adjustments that can be made:
Adjustment #1: affects the balance of the
blades in the closed position along with a small
change to the open position balance.
Adjustment #2: affects the balance of the
blades in the open position. Use this adjustment
method if the damper blades do not achieve full
open position under airflow and you want them
to open further or all the way.
If the airflow through the damper is light and the
blades only slightly move from the closed position,
then Adjustment #1 is required. If the airflow through
the damper is light and the blades do not reach full
open position then Adjustment #2 may be excessive
or Adjustment #1 may need to be increased or both
adjustments may need to be addressed.
Adjustment #1:Balance the Blades in the Closed
Position
Moving the weight along the length of the mounting
bracket slot will affect the full closed balance of the
blade assembly. Moving the weights further away from
the blade pivot point will cause the blades to become
more balanced so that at some point, and with enough
weight, the blades would remain open without air
pressure being applied. Care must be taken to ensure
that when the weights are moved away from the
blade pivot point the weights will not interfere with the
adjacent blade when the blades close. Moving some
of the weights back towards the blade pivot point will
allow the blades to return to the closed position.
Adjustment #2: Balance the Blades in the Open
Position
The damper is factory assembled with the
counterbalance assembly installed such that, the
counterbalance weights and bracket are positioned at
a slight angle to the surface of the blade. This angle
will position the weights such that they will provide
a slight load that will cause the blades to rotate from
the full open position toward the closed position.
If for some reason the blades remain in the open
position then you will need to increase this load. To
do this the counterweight mounting brackets should
be bent further away from the blade surface. Bending
the counterweight mounting brackets will move the
counterweight stack away from the blade surface and
therefore the torsion effect will force the blades to start
closing. This adjustment should be performed in small
increments to each weight bracket.
Counterbalance Adjustment for EM/ES-
40, 41, 42: Horizontal Mount - Vertical
Airflow Down
There are two different adjustments that can be made:
Adjustment #1: affects the balance of the
blades in the closed position along with a small
change to the open position balance.
Adjustment #2: affects the balance of the
blades in the open position. Use this adjustment
method if the damper blades do not achieve full
open position under airflow and you want them
to open further or all the way.
If the airflow through the damper is light and the blades
only slightly move from the closed position, then
Adjustment #1 is required.
Adjustment #1:Balance the Blades in the Closed
Position
Moving the weight along the length of the mounting
bracket slot will affect the full closed balance of the
blade assembly. Moving the weights closer to the
blade pivot point will cause the blades to become less
balanced so that at some point the blades would fall
open. Care must be taken to ensure that when the
weights are moved outward from the blade pivot point
the weights will not interfere with the adjacent blade
when the blades close. Moving some of the weights
back towards the blade pivot point will force the blades
to the close properly. If the damper blades do not close
completely and Adjustment #1 has been addressed,
then more weight is required.
ES EM GM Series 3

Multi-Section Assembly
When the finished damper assembly is made up of multiple sections, the sections will require field assembly. Frame
clips are provided for this purpose. The frame clips are a snap fit component that fit over the joint between adjoining
sections. The clips will require the use of a rubber hammer of similar tool to install as shown below. Install frame clips
on the front side and backside of the assembly. For added strength, screws may be used on the backside of the
frames in lieu of or in addition to the frame clip. Do not install screws on the front side of the frame where they could
interfere with the operation of the blades. Note: Used only on EM series dampers.
Frame clip Front side of damper blade
overlaps the frame.
Blade
Use screws here if
necessary
Vertical joint shown. Horizontal joint is similar.
Frame clip
Adjustment #2: Balance the Blades in the Open
Position
The damper is factory assembled with the
counterbalance weights and bracket installed such
that, when the blades are closed, the counterbalance
weights and bracket are positioned directly in-line or
slightly ahead of the blade pivot points. The position of
the weights will provide a slight load that will cause the
blades to rotate from the full open position toward the
closed position. To increase this load, the counterweight
mounting brackets can be bent toward the adjacent
blade surface. Bending the counterweight mounting
brackets will move the counterweight stack which
will force the blades to start closing. This adjustment
should be performed in small increments to each weight
bracket since bending the brackets too much cause
the weight stack to interfere with the adjacent blade
surface.
483513 • ES EM GM IOM, Rev. 1, September 2018 Copyright 2018 © Venco Products4
As a result of our commitment to continuous improvement, Venco reserves the right to change specifications
without notice.
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