Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
Page 2.102
8/07
IOM-MLS3N
INSTALLATION AND OPERATION INSTRUCTIONS
POSITION INDICATOR PACKAGE FOR COMBINATION
FIRE / SMOKE AND SMOKE DAMPERS
MODEL: MLS-300. For use with GGD221/121 (electric)
and 331-2961/3060 (pneumatic) actuators
APPLICATION:
• The MLS-300 Position Indicator Package operates as a function
of the damper blade position and provides the ability to remotely
indicate damper blade position.
• The MLS-300 incorporates two SPDT switches and provides a
positive open or closed signal when used in conjunction with
remote indicator lights. MLS-300’s are used in active smoke
control management systems to positively indicate the status of
all combination fire/smoke and smoke dampers in the building.
• The MLS-300 is available only as a factory installed option on
combination fire / smoke and smoke dampers.
Position Indicator Microswitch Data:
Switch Type: Single Pole double throw (2)
15 Amps, 1/3 HP, 125, 250 Vac or 24 Vdc.
1/2 Amp, 125 Vdc. 1/4 Amp, 250 Vdc.
EXTERNAL RIGHT HAND MOUNTING: FRONT VIEW (LESS COVER)
COVER
A
A
2 7/8" (73)
3" (76)
4 1/8" (105)
MS-2
MS-1
BLUE
YELLOW
SECTION A - A
JACKSHAFT /
DRIVESHAFT EXTENSION
CONDUIT
CONNECTION
DUCT OR
SLEEVE
13/16"
(21)
JACKSHAFT
MOUNTING BRACKET
1
6
7
5
4
3
2
3
NAILOR INDUSTRIES INC.
MLS-300
L2
L1
CLOSED
(YELLOW LIGHT)
OPEN
(GREEN LIGHT)
MS2 DAMPER CLOSED
MICROSWITCH
BLU
BLU
YEL
YEL
MS1 DAMPER OPEN
MICROSWITCH
REMOTE CONTROL
STATION
(BY OTHERS)
MOUNTED ON DAMPER
(FACTORY WIRING TERMINATES
AT SPLICE POINTS INDICATED
INSIDE SWITCH BOX)
Typical Combination Fire / Smoke Damper
Installation With UL Listed Actuator
Description:
1. Electrical Junction Box. [and EP switch with pneumatic
actuator(s)]
2. ERL 165, 212, 250, 350 Electric Resettable Link (Heat
Sensor)
3. MLS-300 Position indicator package
4. Actuator (pneumatic illustrated).
5. Silicone Tubing or Flexible Conduit
6. Over-Center Knee Lock
7. Jackshaft
Figure 1.
MLS-300 Wiring Schematic.
Dimensions are in inches (mm).
Page 1 of 2
