LT-10-R CARTRIDGE
The LT-10-R cartridge (Figure 5) is a pressure vessel that is
factory-filled with nitrogen to 1800 psi at 70 °F (12400 kPa at 21
°C). The cartridge provides the pressure required to actuate the
connected fire suppression system. Following operation, the
cartridge must be replaced.
PART NO. 423423
FIGURE 5
000851
MOUNTING BRACKETS
The CHECKFIRE MP-N Detection and Actuation System offers
three types of steel mounting brackets.
The first type, Part No. 423525, is a combined bracket for mount-
ing the control module and the pneumatic actuator together. See
Figure 6.
The second type, Part No. 423528, is an individual bracket for
mounting the control module separate from the pneumatic actua-
tor. Note: When ordering this bracket, it is also necessary to order
the pneumatic actuator bracket, Part No. 416828. See Figure 6.
The third type, Part No. 423531, is a retrofit bracket for mounting
an MP-N module to any existing CHECKFIRE MP bracket.
All brackets can be fastened by either bolting or welding. Brackets
are painted with red enamel paint.
COMBINED BRACKET RETROFIT BRACKET
PART NO. 423525 PART NO. 423531
002756 002757
MODULE BRACKET ACTUATOR BRACKET
PART NO. 423528 PART NO. 416828
002758 008213
FIGURE 6
LINEAR DETECTION WIRE
The linear detection wire consists of two spring steel conductors
which are separated by a heat-sensitive insulator. At the tempera-
ture rating of the wire, 356 °F (180 °C), the insulator melts, allow-
ing the two conductors to make contact. This contact provides
electrical continuity between the two conductors. The linear detec-
tion wire is supplied in lengths of 100 ft. (30.5 m), Part No. 71230,
or 500 ft. (152.4 m), Part No. 71231, and must be ordered sepa-
rately. See Figure 7.
FIGURE 7
000855
THERMAL SPOT DETECTOR
Thermal detectors are normally open, contact closure devices.
The fixed temperature design of these detectors will cause the
contacts to close when the temperature of the surrounding air
reaches the set point temperature of the detector. See Figure 8.
FIGURE 8
000856
Thermal detectors are available in three preset temperatures as
shown below. Each temperature rating is stamped on the detector.
Rated Maximum
Operating Continuous
Temperature Use Temperature Detector
°F (°C)
°F (°C) Color Part No.
270 (132) 234 (112) Blue 416218
325 (163) 280 (137) Red 416219
360 (182) 312 (155) Red 416220
SYSTEM COMPONENTS
PAGE 4 REV. 02 2012-MAY-18
CHECKFIRE MP-N Electric
Detection and Actuation System Manual
SPOT
DETECTOR
CABLE CLAMP
WITHOUT PROTECTIVE
TUBING, PART NO.
416762
CABLE CLAMP WITH
PROTECTIVE TUBING,
PART NO. 416214
MOUNTING
BRACKET,
PART NO.
416221
SAFETY
SHIPPING CAP
CARTRIDGE
INSULATED
SPRING STEEL
CONDUCTORS
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