Montague GM Installation Manual

Part number 468391

ES, EM & GM series

Installation, Operation, and Maintenance Instructions

This manual is the property of the owner, and is required for future maintenance. Please leave it with the
owner when the job is complete.

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(37ºC).

Due to continuing research, Greenheck reserves the right to change specifications without notice.

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.

SAFETY WARNING:

Pre-Installation Guidelines

The basic intent of a proper installation is to secure the 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 or linkage. 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. (See Figure 1)

3) Do not install screws in damper frame that will interfere with damper blades and prevent them from opening and/or
closing.

Pre-Installation Guidelines continued...

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 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) Drywall/mortar dust

Spreader Bar

Attachments

b) Firesafing materials
c) Wall texture
d) Paint overspray

6) Damper should be sufficiently covered as to prevent overspray if wall texturing or

Multi section dampers

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

Figure 1

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.

EM/ES/GM Damper 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 & 32 Models: Vertical Mount – Horizontal Airflow

Adjustment #1 will effect the balance of the blades in the open position. Adjustment #2 will effect the balance of the
blades in the closed position along with a small change to the open position balance.

If the damper blades do not achieve full open position under airflow and you want them to open further or all the way,
then adjustment #1 will need to be performed. If the damper blades do not open completely and adjustment #1 has
been addressed, then more weight is required.

If the airflow through the damper is light and the blades only slightly move from the closed
position, then adjustment #2 and #1 are required.

Adjustment #1:

Moving the weight stack along the length of the mounting bracket slot will effect 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.

Adjustment #2:

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 inline with the blade pivot points. This position of the weights will
provide a slight 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 to far. Performing adjustment #2
will have a small effect on adjustment #1 therefore, if adjustment #1 is critical, then
adjustment #1 may need to be repeated.

Bend Here