50
HELIX™ Manual
(P/N 26291)
Chapter 4: System Installation
Rev A (February 2018)
HELIX™ PCU
Fire Suppression System
4.3 System Actuation Control Head Installation
The Amerex HELIX Fire Suppression System has two different options available for system
actuation including the Electric Control Head and the Pneumatic Control Head. The following
sections describe installation of each of these options.
4.3.1 Electric Control Head (P/N 14032
-
R)
Install per the following (See Figure 4.3.1a):
1.
Remove Shipping Plate (P/N 10099) from top of Agent Cylinder Valve. Retain the (2) 5/16”
-
18
b
olts (See Figure 2.1a).
2.
Verify that the tapered end of the stainless steel piston is loosely captive at bottom of Electric
Control Head.
3.
Locate Electric Control Head on top of Agent Cylinder Valve as shown.
4.
Install (2) bolts retained from Step 1 as shown. Use medium grade thread locking compound
and torque to 10 ft
-
lbs.
5.
Verify that Linear Actuator O
-
ring (P/N 17137) is in place. Install Linear Actuator (P/N 20500
-
R) and tighten hand tight.
Do not over tighten. Do not use PTFE thread tape. Ensure
Linear Actuator body makes full contact with control head.
The Linear Actuator will be
connected to the STRIKE ECS (See Section 4.8.2).
6.
For indoor applications or when Agent Cylinders are within an enclosure
, secure Linear
Actuator lead to the Agent Cylinder Valve body with a cable tie allowing a 1” minimum bend
radius for strain relief of the Linear Actuator lead.
For outdoor applications
, a 3/4” outdoor junction box may be attached to the Electric Control
Head (3/4” NPT) to house the Actuation Lead Cable connection and Linear Actuator, with
outdoor conduit protecting the Actuation Lead Cable back to the STRIKE Unit (See Figure
4.3.1b).
Figure 4.3.1a
ELECTRIC CONTROL
HEAD (P/N 14032
-
R)
(2) 5/16”
-
18
BOLTS
LINEAR ACTUATOR
(P/N 20500
-
R)
CABLE TIE
STAINLESS STEEL
PISTON
O
-
RING (P/N 17137)
TO ACTUATION
LEAD CABLE
(STRIKE UNIT
)
Figure 4.3.1b
LINEAR
ACTUATOR
(P/N 20500
-
R)
ACTUATION LEAD CABLE
(TO STRIKE UNIT
)
(3/4 NPT)
ELECTRIC CONTROL
HEAD (P/N 14032
-
R)
(CONTROL HEAD)
(LINEAR ACTUATOR)
LINEAR ACTUATOR MUST BE
FULLY SEATED TO BRASS
HEAD SURFACE