© MAHLE
14 | NTF-515B | Nitrogen service
en
3. Nitrogen service
3.1
Preparation
Perform the following preparatory work prior to vehicle nitrogen
service:
m
Inspect hoses for signs of damage prior to performing service.
Use of damaged hoses will result in a loss of pressure during
service. This could cause uneven tire pressure or an error to
display.
t
Follow the vehicle manufacturer's recommendations for tire
pressure.
1.
To fill internal storage tank, connect air supply to inlet connec-
tion on back of unit (Fig. 2, Pos. 9).
2.
Turn purity selector valve (Fig. 2, Pos. 6) to desired setting.
3.
Turn power switch to the On position.
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Tires which have been in service may contain foreign sub-
stances such as leak sealers. It is important that these
substances are not pulled into the NTF-515B unit during the
procedure resulting in possible performance issues and costly
repairs not covered by MAHLE's warranty.
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When servicing a vehicle, first check the valve stems and valve
stem caps for any type of fluid or foreign substance. Install
deflators and allow tires to deflate to 0PSI if there is evidence
of any foreign substance, then connect hoses and reinflate
tires with nitrogen.
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While using the NTF-515B, the automatic drain function of
the filters may activate to remove excess water and oil. This
is normal with the standard operation of the unit.
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When verifying pressure accuracy of the NTF-515B, make sure
the gauges being used are good quality, calibrated gauges.
Low quality pressure gauges, such as "stick" gauges, have
an accuracy of ±2 or 3PSI. This could allow for as much as
3-4PSI difference between the gauge reading and the display.
3.1.1 Over pressure setting (OPS) and nitrogen
purge cycles (N2P)
The Over Pressure Setting can be used to improve the nitrogen
purity in the tire(s). The Over Pressure Setting over inflates the
target pressure on the first inflation by the OPS amount. For ex-
ample, if the OPS is set at 5PSI and the initial target pressure is
set to 30PSI, the N2P will deflate to 3PSI, inflate to 35PSI, deflate
to 15PSI, and then inflate to 30PSI. Inflating to 35PSI during the
first inflation instead of 30PSI will result in higher nitrogen purity
in the tires.
The number of Nitrogen Purge Cycles can be adjusted. One
Nitrogen Purge Cycle consists of deflating, inflating to target
pressure (+OPS if adjusted), deflating to 50% of target pressure,
and inflating to the target pressure. This entire process can be
automatically repeated by changing the number of Nitrogen
Purge Cycles. This will result in a higher nitrogen purity in the tires.
1.
Turn power switch on.
2.
Press
N
2
button once.
3.
Press
+
or
-
buttons to change the Over Pressure Setting
(OPS).
4.
Press
START
button to save the Over Pressure Setting (OPS).
5.
Press
N
2
button.
6.
Press
+
or
-
buttons to select desired number of Nitrogen
Purge Cycles (N2P).
7.
Press
START
button to save the number of Nitrogen Purge
Cycles (N2P).
3.2
Battery charging
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The NTF-515B is powered by an internal 12VDC battery.
Charge the battery for at least 5 hours prior to first use.
Battery charge level is displayed on the top screen during
power up of unit.
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HI indicates the battery is charged. LO indicates low charge
and battery needs to be recharged.
Plug battery charger in wall outlet and insert plug into battery
charging port. Unit can be operated during recharging proc-
ess. Typical recharge time is 3-5 hours, depending on battery
condition.
