TFP1262
Page 2 of 4
FIGURE 1
MODEL TAV-D AIR VENT DRY
ASSEMBLY
Operation
Step 1.
Verify the vent assembly is
equipped with a restricted venting
orifice downstream of the backpres-
sure regulator.
Note:
If the vent assembly is not equipped
with a restricted venting orifice, one will be
provided by TYCO during system commis-
sioning. The restricted venting orifice must
be installed before proceeding with the
steps below.
Step 2.
Determine the low air alarm
pressure and the turn-on pressure of
the nitrogen generator.
Step 3.
Choose a pressure setting
for the backpressure regulator that
is 3 to 5 psig (0,2 to 0,3 bar) above
the low air alarm pressure but below
the turn-on pressure of the nitrogen
generator.
Step 4.
Pull the knob out from the reg-
ulator to adjust the pressure setting.
Turn the knob clockwise to raise the
pressure, counter-clockwise to lower
the pressure.
Step 5.
Close the ball valve and allow
the device to depressurize through
the restricted venting orifice to the
pressure setting. Adjust the pressure
setting using the knob, then open the
ball valve to pressurize the device and
close the ball valve again to check the
pressure setting. Repeat the process
until the desired pressure setting is
achieved.
Note:
This process can only be performed
when the fire sprinkler system is at normal
operating pressure.
Step 6.
Push the knob back into the
regulator until it clicks into place.
Step 7.
Once the TYCO Nitrogen Gen-
erator is commissioned, open the iso-
lation ball valve on the vent assembly.
The Air Vent is now open and actively
venting oxygen from the fire sprin-
kler system. It should remain open
for approximately 14 days or until the
system nitrogen concentration reaches
98% or greater. Use a TYCO Model
THGA Handheld Gas Analyzer to verify
the gas concentration inside the fire
sprinkler system.
Step 8.
Close the isolation ball valve.
Failure to close the manual ball valve
after 14 days or once the fire sprinkler
system nitrogen concentration reaches
98% will result in additional oxygen
corrosion damage to the system and
unnecessary run time of the air com-
pressor and nitrogen generator.
Step 9.
If the sprinkler system actuates
or another event introduces oxygen
to the sprinkler system the manual
ball valve must be opened again for a
period of 14 days to vent oxygen from
the system.
Installation
The TYCO Model TAV-D Air Vent, Dry
must be installed in accordance with
this section.
Step 1.
The Model TAV-D Air Vent is
equipped with a ball valve to be con-
nected to the fire sprinkler riser. The
contractor must install a 1 in. outlet
(welded or mechanical) to connect the
vent assembly to the sprinkler system
on the system side of the main control
valve as shown in Figure 2. The ball
valve must remain in the closed posi-
tion until the TYCO Nitrogen Generator
is commissioned.
Step 2.
Install the vent assem-
bly in a level position. The recom-
mended mounting height is between
5 ft to 10 ft (2 m to 3 m) above the fin-
ished floor.
Note:
Piping to the vent assembly cannot be
installed in a configuration that would trap
water and prevent drainage to the sprinkler
system; a water trap impedes the ability of
the vent assembly to vent oxygen from the
fire sprinkler system.
Step 3.
Inspection of the vent assem-
bly should be performed after installa-
tion and hydrostatic testing of the fire
sprinkler system. Inspection should
be performed periodically thereaf-
ter in accordance with the applicable
NATIONAL FIRE PROTECTION ASSO-
CIATION (NFPA) codes and standards
and/or the authority having jurisdiction.
Note:
Inspection must include the condition
of the in-line filter and checking for blockage
in the “Y” strainer and the restricted venting
orifice.
RESTRICTED VENTING ORIFICE
IN-LINE FILTER
MUFFLER
GAS SAMPLE PORT
BACKPRESSURE REGULATOR
CONNECTION TO
SPRINKLER SYSTEM
ISOLATION
BALL VALVE
QUICK CONNECT
“Y” STRAINER
WITH BALL VALVE
FLOAT
VALVE