1. Who should install the Tigerloop?
Heating systems, as well as system
components like the Tigerloop, must be installed and
maintained by a qualified technician that is familiar
with oil heating systems, equipped with the proper tools
and equipment, and licensed by the proper authority were
applicable. Installation and maintenance by an
unqualified person can result in hazards to that person
and others. These hazards may include spillage of fuel
oil, fire, severe burns, damage to system components,
and other hazards. In short, a Tigerloop, like the other
components on a heating system, is not a do-it-yourself
2. Can I run two burners on one
No. Each burner
needs its own Tigerloop. There are many reasons to use
one Tigerloop per burner. Possibly the most important
reason is that you could exceed the capacity of the
Tigerloop by sending too much oil through it. This could
generate a back pressure that could blow the seals on
the pumps. The Tigerloop is rated for a maximum firing
rate of 20 gph, and a maximum return oil of 30 gph. This
is completely adequate for 1 burner, but you can
approach or exceed the maximum when you add the second
burner. The problem is that with some rebuilt pumps, you
may have a larger gear set inside the pump. Pump
rebuilders do this to compensate for worn pumps. So if
you use a rebuilt pump, you could overflow the Tigerloop.
Also, while you might install 2 brand new pumps which
have never been rebuilt, a different service technician
might come along later and replace that pump with
something else which could then overflow the Tigerloop.
You don't want to set someone up for failure later on.
Also, Tigerholm has designed the Tigerloop for use with
only one burner. Underwriters Laboratories has tested
the Tigerloop and has allowed the Tigerloop to be a UL
Listed product to be used only on one burner. You don't
want to be in a situation where there is some sort of
problem, and you have done something that defies the
written instructions of the manufacturer, and does not
comply with UL's requirement. In addition, the Tigerloop
is a complicated device that is doing a balancing act by
mixing inlet oil with return oil while simultaneously
de-aerating the return oil. You make it a lot harder to
separate the air if you double the velocity of the oil
flow through the unit.
3. Do I need to install the bypass plug?
Yes. The Tigerloop will not work
unless the bypass plug is installed in the pump to set
it to "two pipe" operation. The bypass
plug does not come with the Tigerloop, it comes with the
4. Does the Tigerloop need a filter?
The Tigerloop should have a filter
installed. If an oil filter is used (recommended), it
must be installed in the oil line between the tank and the
center port of the Tigerloop. If you install one of
the "ULTRA" models, the filter is already included.
5. How can I get technical support information on the
OUTSIDE OF THE UNITED STATES:
If you are outside of the United States you need to find
your local distributor by going to:
If you are a homeowner, no technical support is
available. We do not offer technical support to
unqualified persons who are unfamiliar with heating
systems. Call your service technician. He is
familiar with your system and has the necessary
experience, training and skill to service it. For
liability reasons, there is no exception to this policy.
If you are a service technician in the US, you may call
us at 1-800-442-1630. We will validate your status
as a service technician and then answer any questions
6. The Tigerloop is completely filled with oil. Is
As for the fuel level in the bowl of the
1. Original model Tigerloops (old style with only one
chamber) can be almost empty to completely filled and it is
2. Current model Tigerloops (with two chambers, upper and
lower): The lower chamber can be almost empty to completely
filled and it is perfectly normal.
The upper chamber should not have enough oil in it to cause
the upper chamber float to float. If so, the Tigerloop must
With all models, the fuel level can change over time,
especially after an oil delivery which can introduce air
into the dome.
7. Can I service or clean the Tigerloop?
The Tigerloop has no serviceable
parts. It is sealed at the factory and cannot be
opened without destroying it.
The Tigerloop can only be cleaned by wiping with a dry
cloth. USE NO CLEANERS OR ALCOHOL which will
damage the Tigerloop.
8. What additives can be used with the Tigerloop?
CAUTION AGAINST THE USE
OF FUEL ADDITIVES:
Since it would be impractical to identify and test
the many fuel additives that appear on the market,
much less keep abreast of their latest formulas, no
testing or evaluation of additives has been done with
regard to their use with Tigerloops. Therefore, the
decision to use an additive in a system on which a
Tigerloop is installed is not recommended and is solely
the prerogative of the person responsible for that
system, and the consequences of such use rests with them
alone. And while it is hoped that the manufacturers of
fuel additives have formulated them to be compatible
with, and no more harmful to the system than, fuel oil,
it is the responsibility of the person choosing to use
the additive to insure that such is the case.
Introduction of an additive directly into piping,
filters, pumps, Tigerloop, etc. without being first
mixed and diluted in the fuel tank may cause serious
damage to the system and components.
9. What is the maximum lift and run for the Tigerloop?
The Tigerloop has a maximum lift of 13
feet. The maximum run varies according to pipe
size and nozzle size. Refer to this chart for
maximum Lift and Run figures:
Tigerloop Run Lift Chart
10. Can I use a Tigerloop with an overhead line?
Yes, but overhead lines should be avoided
whenever possible as they accumulate air in the overhead
sections and then suddenly pass large amounts of air
into the burner. The instruction sheet which comes
with the Tigerloop has some suggestions on how to pipe a
Tigerloop to feed the air in smaller more
manageable doses through the Tigerloop.
11. What is the maximum firing rate of the Tigerloop?
The Tigerloop has a maximum firing
rate of 20 GPH (or 40 GPH for the Tigerloop Twin
S220-15). The maximum return oil flow cannot
exceed 30 GPH (or 60 GPH for the Tigerloop Twin).
12. I just installed a Tigerloop and I can’t get it to draw
oil from the Tank. What is wrong?
The Tigerloop fills by collecting
return oil from the pump. If the pump is not returning
oil to the Tigerloop it is likely that the “bypass” plug
has not been installed in the pump. If the bypass plug is not
installed, the pump will suck air into the return line
instead of returning oil out of it.
13. Do I have to connect the return line from the pump to
Yes, the Tigerloop uses the return oil
from the pump to operate the floats and diaphragm valve
to determine when to vent air and when to loop the oil
back to the pump. If you don't connect the return
line to the Tigerloop, the burner may fire but the
Tigerloop is performing no function since oil never
reaches the "de-aeration" chamber and oil cannot be
looped back to the pump.