12
2.
You must use Victaulic Company’s Air Maintenance
Trim Assembly (AMTA) with a tank-mounted compressor
or shop air (refer to drawing above). The AMTA provides
the proper air regulation to the sprinkler system, which will
ensure the proper operation of the fire safety valve.
3.
Set the air regulator to 10 psi (69 kPa).
Systems Using a Riser or
Base-Mounted Air Compressor
1.
When a riser or base-mounted air compressor supplies
air to a system using a Series 776 Low-Pressure Actuator, it
is not necessary to use the air maintenance trim assembly
with the air regulator. In this circumstance, the airline of
the compressor connects to the valve’s trim at the fitting
where the air maintenance trim is normally installed.
2.
When the valve is used with this setup, it is the engi-
neer’s/system designer’s responsibility to size the com-
pressor so that it brings the entire system to required
pressure within 30 minutes.
3.
The engineer/system designer must not oversize the
compressor to provide more airflow because it will slow
down, or possibly prevent, the operation of the valve.
4.
A base-mounted compressor does not provide any
backup air to the system. Therefore, the system requires
continuous service (24 hours per day, 7 days per week) in
order to prevent the valve from false tripping due to a loss
of air pressure.
5.
Due to the large on/off differential available on pressure
switches that control base-mounted compressors, you
must adjust the compressor pressure switch so that the
“ON” contact of the pressure switch is set to 9 psi (62 kPa)
minimum. Set the “OFF” contact of the pressure switch to
14 psi (97 kPa) maximum.
Pilot Line Heights
1.
Determine wet pilot line heights from the graphs on
pages 7, 8, and 9. Heights are based on
¹⁄₂
" schedule 40
pipe and a
¹⁄₂
" sprinkler head.
PLACING THE SYSTEM
IN SERVICE
When the deluge system is ready to be placed in service,
verify that all equipment is heated and protected properly
from freezing temperatures and physical damage.
1.
Open the system drain valve located above the clapper.
Confirm that the system is drained.
2.
Confirm that the system drains are shut.
3.
For pneumatic systems:
Open the fast fill ball valve
on the air maintenance device. Fill the pilot system to the
appropriate air pressure for the typical water supply pres-
sure in the area.
NOTE:
Confirm that the pilot 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 pilot system.
3a.
While the system is charging, it may be necessary to
remove the protective cap on the Series 776 and pull up on
the auto vent knob. Confirm that this knob remains in this
“up” position. Replace the protective cap.
• Opening the main control valve of the water supply will cause water to flow from all
open system openings.
Doing so may cause personal injury and/or property damage.
• Make sure you always replace the protective cap over the auto vent knob of the Se-
ries 776 to avoid accidental contact. Hitting the auto vent knob will cause the valve
to trip.
Failure to follow this instruction could result in serious personal injury and/or property
damage.
DISCONTINUED
PRODUCT
