97
HELIX™
Manual (P/N 26291)
Chapter 6: Recharge
Rev A (February 2018)
HELIX™
PCU Fire Suppression System
Figure 6.2.1a
CONTROL HEAD BODY
(P/N 11669)
SAFETY LOCK WASHER
(P/N 17637)
RETAINING RING
(P/N 10149)
PNEUMATIC PISTON ASSEMBLY
(P/N 17635)
O
-
RING (P/N 10148)
SPRING PLUNGER
INNER BORE
7.
In order to remove the Safety Lock Washer (P/N 17637) from the Pneumatic Piston Assembly
(P/N 17635), use a flat head screwdriver to depress the Spring Plunger located on the piston
shaft.
Control Head Cleaning (See Figure 6.2.1a):
8.
Inspect and clean the inner bore of Control Head Body (P/N 11669). If any scarring or
damage has occurred in the inner bore, replace the Control Head Body (P/N 11669).
9.
Inspect and clean the Pneumatic Piston Assembly (P/N 17635), the O
-
ring (P/N 10148), the
Safety Lock Washer (P/N 17637), and the Retaining Ring (P/N 10149). Inspect the O
-
Ring (P/
N 10148) for any cuts/nicks. Replace any damaged components.
10.
Make sure the Spring Plunger is spring
-
loaded and can be forced in and out of the piston
shaft.
Note: Do not remove Spring Plunger from Piston!
If this part is compromised,
replace the entire Pneumatic Piston Assembly (P/N 17635).
Control Head Reassembly (See Figure 6.2.1a & 4.3.2a):
11.
Lubrication: O
-
Ring (P/N 10148) must be lightly lubricated with Visilox (P/N L0172) or
equivalent silicone style lubricant. Inner bore of the Control Head Body (P/N 11669) is to be
lightly lubricated as well.
12.
Insert Pneumatic Piston Assembly (P/N 17635) with O
-
Ring (P/N 10148) into Control Head
Body (P/N 11669). Make sure piston is fully recessed.
13.
Insert Safety Lock Washer (P/N 17637). Do not insert past Spring Plunger!
14.
Reinstall Retaining Ring (P/N 10149) (Note: Always use eye protection when performing this
step).
15.
Reinstall Vent Check (P/N 10173
-
R).
16.
Test the assembly by using 70
-
90 psi at the inlet of the 1/4” NPT port opposite of the Vent
Check port to force the piston through the Safety Lock Washer. After it is acknowledged that
the piston locks, use a flathead screwdriver to depress the Spring Plunger so that the
Pneumatic Piston Assembly can be fully recessed into the Control Head Body again.
