SECTION 4 – SYSTEM PLANNING
2014-MAY-01 rEV. 01 PAGE 4-3
Detection Circuit Cable (Red Connectors)
Connects input devices to the CHECKFIRE 110 Control
Module such as:
• Electric Manual Actuators (EMA)
• linear Detectors
• spot Thermal Detectors
1. Determine appropriate detection method (linear detectors
or spot thermal detectors) and placement for specific cable
end points. Review specific requirements for each at the
end of this section.
2. Choose a path providing protection for the cable, keep the
cables as far away as possible from vehicle electric cables,
particularly power cables to and from generators and elec
-
tric motors; also avoid:
• Antennas and associated cables
• Fire hazard areas
• Areas exposed to mechanical damage
• Proximity to moving parts
• Areas subject to debris accumulation
• Areas exposed to high temperatures (turbo chargers,
exhaust equipment, etc.)
• Areas requiring access by vehicle service and mainte
-
nance personnel
3. Plan route for the cable from the control module to the
detection component end points (note end points for cable
lengths) using the following rules (see Figure 4-1):
• No Double Branching
• No EOl Devices on end of branch
• Branch must end with Detection Circuit Branch Terminator
or EMA
• If used, EMAs must be first component(s) on circuit
• Each EMA must be on a single use branch
• linear Detector may be used anywhere in the main trunk
after the EMA (if installed)
• Main detection trunk must be terminated with EOl Device
4. Select appropriate cable lengths for area of installation.
Total main detection trunk length must not exceed 50 ft
(15.24 m). see section 2 - Components page 2-4, for avail
-
able sizes. Maximum length for individual branch lines is
25 ft (7.6 m) (length not included with main trunk limit)
FIGURE 4-1
CORRECT DETECTION CIRCUIT INSTALLATION
009192
ElECTrIC MANUAl ACTUATOr (EMA)
If used, connect the EMA to the main detection circuit using a
Detection Circuit Tee (Part No. 439394) and appropriate length
of Detection Circuit Cable to the EMA. surface mount (1/4
in. (6.3 mm) maximum thickness) or bracket mount on a flat
surface that will properly support the EMA for vehicle use and
conditions. EMA Bracket (Part No. 440537).
1. When planning the detection circuit layout, the EMA(s), if
used, MUsT be installed before any other device on the
detection circuit. See Figure 4-2.
2. locate EMA where accessible; preferably in path of egress
accessible from ground level. If intended for vehicle oper-
ator manual actuation, locate in operator’s compartment
easily accessible to operator.
3. Each EMA must be branched off the main detection trunk
utilizing a detection circuit tee and is the only component
allowed on the branch.
FIGURE 4-2
CORRECT EMA INSTALLATION
009193
CHECKFIRE 110
Detection and Actuation System