43
HELIX™ Manual
(P/N 26291)
Chapter 3: System Design
Rev A (February 2018)
HELIX™ PCU
Fire Suppression System
LHD
(P/N 24744
-
XX)
INSTALLED BEHIND
LAST FILTER BANK
(DOWNSTREAM)
STRIKE CONTROL
UNIT (P/N 23826)
C#*
=
CONNECTION
LOCATION
(FOR PRE
-
TERMINATED
CONNECTORS IN
SEQUENTIAL
ORDER)
Figure 3.6.2b
DETECTION
LEAD CABLE
(P/N 24409
-
XX)
AMBIENT AIR TEMPERATURE 250ºF
(121ºC) MAX
P
-
CLAMPS (P/N18720) OR
LHD CLIPS (P/N 23524)
LHD TUBING (P/N 24744
-
XX)
FASTENERS (P/N 24832/20535/20536)
C1*
24” MAX SPACING
BETWEEN SUPPORTS
As a minimum, a single LHD must be routed in a continuous “S” shaped pattern behind the last
(
downstream) filter bank in the PCU, resulting in 3 horizontal runs across the cross
-
sectional area of
the PCU (See Figure 3.6.2b). An LHD Quik Seal (P/N 24737) or Compression Seal (P/N 26427) for
PCU wall penetration shall be located in a corner of the PCU. The EOL shall also be located in a
corner of the PCU. LHD Support Clips (P/N 23524)/Split Tubing (P/N 24539) or P
-
Clamps (P/N
18720
-
R) must be used for support at a minimum of every 24” (0.61 m).
This method provides
detection for up to 3 consecutive filter banks within the PCU. Larger PCUs utilizing more
than 3 consecutive filter banks must have an additional “S” shaped route, positioned
upstream, which can be accomplished using a single LHD routed through the PCU from the
last filter bank to additional upstream filter banks as required.
A Detection Lead Cable (P/N 24409
-
XX) must be used to connect the STRIKE
Unit to the LHD. The
connection location for the Detection Lead Cable and LHD shall be outside of the PCU.
Note: For
outdoor applications, all STRIKE
lead and extension cables must be located within an
enclosure or must be routed through approved outdoor electrical conduit as protection.
EOL
COMPRESSION SEAL
(P/N 26427)
QUIK SEAL (P/N 14204)
(CONDUIT/ JUNCTION
BOX)
DETECTION LEAD CABLE
(P/N 24409
-
XX)
TO STRIKE
OUTDOOR INSTALLATION
(1/2 NPT)
LHD (P/N 24744
-
XX)
C1*
QUIK SEAL
(P/N 24737)
DETECTION LEAD
CABLE (P/N 24409
-
XX)
TO STRIKE
INDOOR INSTALLATION
C1*