9
5a. If the system contains a Series 746 Dry Accelerator,
close the ¹⁄₄-inch isolation ball valve.
5b. Confirm that the system is charging by observing the
air pressure gauge. If the gauge is not showing an increase
in air pressure, there is a leak or an open line in the release
system. It may be necessary to push down on the upper
chamber seal of the Series 753-A Dry Actuator while the
system is charging.
6. Once the system’s air pressure has been established,
close the fast fill ball valve. Open the slow fill ball valve.
Confirm that the air regulator is set to the proper system
pressure. NOTE: On systems using a Series 746 Accelera-
tor, set the accelerator by following the instructions pro-
vided with the accelerator (I-746).
6a. Observe the system’s air pressure over a 24 hour
period to confirm system integrity. If there is degradation in
the system air pressure, find the leaks and correct. NFPA
requires less than 2 psi leakage in 24 hours.
6b. For electric systems: Confirm that the solenoid is
closed.
6c. For valves equipped with an accelerator: The
accelerator must be set prior to setting up the water sup-
ply (refer to the accelerator’s installation manual I-746).
7. Open the piston charge line ball valve. Allow the system
to pressurize.
8. Remove the red protective cap from the Series 749 Auto
Drain. Pull on the auto drain set screw until the auto drain
is set (approximately 10 psi). Replace the protective cap on
the auto drain.
SERIES 749 AUTO DRAIN ASSEMBLY
SLOW FILL
BALL VALVE
• Make sure you replace the protective cap over the auto drain set screw to avoid ac-
cidental contact. Hitting the set screw will cause the valve to trip.
Failure to do so could result in serious personal injury and/or property damage.
Cap
Set Screw
Seal
Compression
Fitting
Drain
Hose
Body
Spring
Stem
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