Slant/Fin LX-90 Installation And Operating Instructions Manual page 9

Lynx
Figure 6.
3. The vent termination is in addition to the allowed
equivalent lengths.
4. Minimum vent length is 2 feet of straight pipe, plus one
90˚ elbow that is required.
5. Vent length restriction is for both direct and non-direct
vent installations.
EXAMPLE: The combustion air is provided by air intake
piping directly to the boiler (direct-vent installation). The vent
piping will be PVC and installation location will require the
use of 4 elbows for the vent to run the termination. The air
intake piping will also be PVC, and also will require the use
of 4 elbows.
In this case, the maximum straight pipe vent length that can
be utilized with the 4 elbows would be: 100' - (4 x 5') = 80'.
Since the air intake pipe also is PVC and requires the use of
4 elbows, the maximum straight pipe air intake length that
can be utilized is also 80 feet.
If the air for combustion were taken from the boiler room
(non-direct vent installation), still the maximum straight vent
length would be 80 feet.
Equivalent Length of Various 90-Degree Elbows
Manufacturer
Heat-Fab, Inc. Saf-T Standard
elbow
Heat-Fab, Inc. Saf-T, tight radius elbow
ProTech System, Inc. FasNseal
Flex-L International, Inc. StaR-34
N/A PVC, Schedule 40
N/A CPVC, Schedule 40
Centrotherm Eco Systems Polypropylene
Equivalant length (Ft.)
Type/System
6. The Lynx boiler is equipped with a built-in condensation
drain and trap. The trap must be filled with water. DO NOT
operate the boiler without filling the trap with water to
prevent flue gas discharge into space. The drain must
dispose of possibly large quantities of condensate, which
may require a neutralizing system. Refer to the "Condensate
Drainage" section of this manual. No additional condensa-
tion drain and trap is required on the vent piping
system itself.
7. The horizontal vent pipe must be sloped upward from the
boiler at a pitch of at least 1/4" per 1 foot of run, so that
the condensate from the vent system runs to the boiler
vent adapter pipe, then out the built-in condensation drain
and trap.
8. The horizontal vent and air intake pipes must be supported
with pipe straps, at intervals no greater than 5 feet, when
polypropylene, PVC/CPVC pipe is utilized. This support
spacing applies also to stainless steel vent pipe, unless the
manufacturer's instructions permit otherwise. The vertical
vent and air intake pipes also must be supported, wherever
the building construction provides allowance for it, such as
ceiling or roof passage openings where a firestop and
support or braces can be affixed.
9. Minimum clearances of vent pipes from combustible
constructions must be maintained (see Page 4). No
clearance is required between the vent and air intake pipes
of this boiler.
10. Common venting with other appliances or another Lynx
boiler is not allowed.
11. DO NOT install a vent damper or similar devices in vent
system or on the boiler.
12. DO NOT insulate venting system.
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