Post-Discharge Maintenance
06-236115-001 6-1 October 2014
CHAPTER 6
POST- DISCHARGE MAINTENANCE
6-1 INTRODUCTION
Follow these procedures after the Kidde ECS System has been activated and HFC-227ea has
been discharged.
6-2 POST-FIRE MAINTENANCE
6-2.1 HFC-227ea Valve Inspection and Service
Inspect and service the HFC-227ea valve as follows:
Important–Because the HFC-227ea tends to dissolve and wash out lubricant, certain
components in the HFC-227ea valve assembly will have to be inspected and serviced before
recharging the cylinder/valve assembly. Part numbers for items which may require
replacement are listed in Table 6-1.
Note: Whenever the valve is rebuilt, the Safety Disc Assembly must be replaced along with
the O-rings.
6-2.2 Valve Disassembly (1½ in, 2 in and 2½ in Valve)
Refer to Figure 6-1, Figure 6-2, Table 6-1, and Table 6-2.
1. Remove the valve with the siphon tube from the cylinder.
2. Remove the O-ring and replace it, applying a lubricant to the new O-ring.
3. Remove the valve cap, spring and piston assembly.
Note: Remove all internal components of HFC-227ea valve from the top of the assembly.
However, if there is excessive piston O-ring friction, the siphon tube may have to be
removed and the piston assembly pressed out from the bottom.
4. Remove the O-rings and replace, applying lubricant to the new O-rings.
5. Ensure that the O-ring protrudes a minimum or 0.020 in (0.5 mm) above the conical seat-
ing surface of the piston assembly. Replace this O-ring by removing the seat retainer. Be-
fore reassembly, apply a lubricant to the O-ring.
6. Examine the valve core pin for any evidence of bending or other damage. Depress the pin
and make certain it snaps back freely. Replace the valve core if necessary using a standard
Schraeder core wrench. When reinstalling a new Schraeder core element, torque to 1½ to
3 in· lb (0.17 to .34 N-m).
WARNING
Before removing the valve, make sure that all pressure has been relieved from
the cylinder. To relieve any remaining pressure, restrain the cylinder and
depress the pressure switch Schraeder valve until all pressure is relieved.
CAUTION
After reinstalling a Schraeder core, the distance from the top of the core pin to
the control head seating surface must fall between the dimensions of 0.515 in
to 0.565 in (13 mm to 14 mm) when in the “shut” or non-actuated position (see
Figure 6-1).
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