ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS
63-2534—1
5
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After the installation is complete, check out the product
operation as provided in these instructions.
WARNING
Explosion Hazard.
Can result in serious injury or death.
Install the actuator in areas free of escaping gas and
other explosive vapors to prevent a spark from
actuator or attached accessories from igniting
escaping gas or vapors.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Disconnect power before installation.
Disconnect all power supplies before installation.
Motors with auxiliary switches can have more than
one disconnect.
CAUTION
Actuator Damage Hazard.
Deteriorating vapors and acid fumes can damage
the actuator metal parts.
Install actuator in areas free of acid fumes and other
deteriorating vapors.
Location
Choose a location for the actuator that allows enough
clearance for mounting accessories and for servicing.
Mounting
The ML6174/ML7174 Direct Coupled Actuators are designed
to open a damper by driving the damper shaft in either the
clockwise or counterclockwise direction. The actuator has a
mounting tab on the bottom that secures it to a damper box.
When mounted correctly, this tab allows the actuator to
float
without rotating relative to the damper shaft. The tab is sized
for 1/4 in. (6 mm) self-tapping sheet metal screws (not
provided).
CAUTION
Equipment Damage Hazard.
Tightly securing mounting tab to damper housing
can damage actuator.
Do not fully tighten the screw, when mounting, to
allow the actuator to float.
ML6174 and ML7174 Direct Coupled Actuators are shipped in
the fully clockwise [cw arrow] 90
°
position as viewed from the
end of the damper actuator shaft.
CAUTION
Equipment Damage Hazard.
Mounting actuator unevenly with damper housing
can damage actuator.
Mount the actuator flush with the damper housing or
add a spacer between mounting tab and the damper
housing (see Fig. 2).
ADD SPACER BETWEEN
DAMPER BOX AND TAB
DAMPER
SHAFT
ML6174
VAV BOX HOUSING
M10245
Fig. 2. Mounting ML6174/ML7174 to VAV box when
actuator is not flush with box.
Preparation
Before mounting the actuator onto the damper shaft,
determine the following:
1.
Size of the damper shaft (3/8 in. to 1/2 in.).
2.
Direction the damper shaft rotates to open the damper
(cw or ccw). See Fig. 3.
3.
Angle of the damper opening (45
°
, 60
°
, or 90
°
).
If the damper shaft is 3/8 in. round or square, use part
number 201391 Shaft Adapter provided inside the bag
assembly shipped with the actuator. Place the adapter
opposite the setscrews (see Fig. 4).
COOLING
AIR FLOW
COOLING
AIR FLOW
CW TO OPEN, CCW TO CLOSE
CCW TO OPEN, CW TO CLOSE
M2067A
TYPE A DAMPER
TYPE B DAMPER
Fig. 3. Determining direction damper shaft rotates
when opening.
