PRL • Pneumatic Replaceable Link • For Fire/Smoke Dampers

PRL • Pneumatic Replaceable Link • For Fire/Smoke Dampers
PNEUMATIC REPLACEABLE LINK
FOR COMBINATION FIRE/SMOKE DAMPERS
MODEL: PRL
Application and Operation
The Nailor PRL Pneumatic Replaceable Link is a UL
Classified heat responsive device used in conjunction with
Nailor combination fire/smoke dampers.
1
The PRL is supplied as standard on all combination
fire/smoke dampers ordered with a pneumatic actuator. An
alternative to the PRL would be the Nailor ERL (Electric
Resettable Link) with an EP (Electric/Pneumatic) Switch.
2
The PRL is a factory mounted pneumatic release
valve/replaceable fusible link assembly. The PRL’s
function is to sense an abnormally high temperature, as
caused by a fire, and allow the damper to close in order to
prevent the spread of fire and smoke.
3
4
5
Fire Control Mode: The PRL activates when fire
temperatures in excess of 165, 212 or 280°F (74, 100 or
138°C) are detected. When the fusible link melts, air from
the pneumatic actuator(s) is exhausted and the actuator
spring return mechanism causes the damper to close and
lock.
Smoke Control Mode: When a signal is detected via a
normally closed smoke detector connection, during system
testing or if power failure occurs, the damper will close and
remain closed. When the smoke signal ceases (smoke
detector reset), the test is completed or power is restored,
the damper will automatically reset to the open position.
An EP (Electric/Pneumatic) Switch, by others, must be
present in the system.
All pneumatic actuators are factory mounted with a fail
close (Normally Closed) damper connection.
Typical Combination Fire/Smoke Damper
Detail with UL Listed Pneumatic Actuator
Description:
1.
2.
3.
4.
5.
PRL 165, 212 or 280°F Pneumatic Replaceable Link
Silicone Tubing
Pneumatic Actuator
Over-center Knee Lock
Jackshaft
Notes:
1. The PRL must be installed at the factory and cannot be
added in the field, in accordance with UL requirements.
2. A single PRL may be use to control up to a maximum of
four pneumatic actuators.
SILICONE TUBING
CONNECTION
TO ACTUATOR
DAMPER
SLEEVE
3. Pneumatic actuators are to be field piped per local
codes.
FUSIBLE
LINK
RESTRICTOR VALVE
1/8" (3) MALE NPT
SUPPLY PORT
PRL Top View
SCHEDULE TYPE
PROJECT
ENGINEER
CONTRACTOR
Dimensions are in inches (mm).
DATE
B SERIES
9 - 9 - 08
FD-ACC
SUPERSEDES DRAWING NO.
Nailor Industries Inc. reserves the right to change any information concerning product or pricing without notice.
4 - 15 - 03
PRL
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