65
HELIX™ Manual
(P/N 26291)
Chapter 4: System Installation
Rev A (February 2018)
HELIX™ PCU
Fire Suppression System
4.8.1 Detection Circuits
The STRIKE ECS has two dedicated Class B detection circuits which support LHD detection
devices or zone specific Manual Pull Station devices. Each detection circuit may utilize a single
device or multiple devices connected in series. The Detection Lead Cable (P/N 24409
-
XX) is used
to connect a single detection device, or first device in a series, back to the STRIKE Control Unit
enclosure. The Detection Extension Cable (P/N 24410
-
XX) is used between detection devices
connected in series on the same circuit.
An End of Line Module or EOL (P/N 23474) is ALWAYS
required at the end of each detection circuit.
All detection cables and components are color
coded green for reference.
WARNING: Manual Pull Stations installed in a detection circuit are intended for zone specific
actuation only, and only the programmed actuation zones for that detection circuit will be activated
when pulled. Also, Manual Pull Lead Cables (P/N 24412
-
XX) and Extension Cables (P/N 24413
-
XX)
must be used in lieu of Detection Lead and Extension Cables for all connections to a Manual Pull
Station. Reference Figure 4.8.1b for specific instructions for cable connection at the Manual Pull
Station.
For single detection device (LHD) circuit installations (See Figure 4.8.1a):
1.
Route the blunt cut end of the Detection Lead Cable (P/N 24409
-
XX) from the installed LHD
back into the STRIKE Control Unit enclosure through the selected knockout. Any excess length
in the cable should be pulled into the STRIKE Control Unit enclosure and may be trimmed later.
Do not cut, pinch, crush, or chafe any electrical wiring or connectors during installation.
2.
Connect the female LHD connector (F) to the lead cable connector (M). For outdoor
installations, this connection should be housed in an outdoor junction box.
3.
Ensure an EOL Module (P/N 23474) is installed on the male connector (M) at the LHD end.
4.
Termination of the Detection Lead Cable to the STRIKE Control Unit is performed in Section
4.10.
Ensure the device and associated cable are fully installed
and connected before
proceeding to prevent any fault or alarm conditions or accidental discharges!
DETECTION LEAD CABLE
(P/N 24409
-
XX)
EOL (P/N 23474)
FULLY INSTALLED
DETECTION DEVICE
(LHD)
STRIKE CONTROL
UNIT
(F)
(M)
PULL LEAD CABLE
INTO STRIKE CONTROL
UNIT ENCLOSURE
THROUGH SELECTED KNOCKOUT LOCATION. ANY EXCESS
LENGTH MAY BE TRIMMED LATER PER SECTION 4.9.
CONDUIT (AS REQUIRED)
CONNECT
ROUTING DIRECTION
(M)
Figure 4.8.1a
JUNCTION BOX & CONDUIT
(FOR OUTDOOR INSTALLATION)