Max. Allowable Vent Piping Lengths - Lochinvar WH 55-399 Installation & Operation Manual

3
General venting
Table 3B Approved Stainless Steel Terminations and Adapters
ProTech
FasNSeal
Model
Boiler Flue
Adapter Termination
55 - 85
303005
FSBS3
FSRC3(R.C)
110 -285
303006
FSBS4
399
303007
FSRC4(R.C)
* = This adapter must be used in addition to the boiler adapter for Saf-T vent pipe as shown in FIG. 3-10, unless approved vent
other than standard diameter is used. Consult a Heat Fab representative for questions.
Stainless steel
connections
1. Combustion Air Intake Connector (FIG. 3-10) -
Used to provide combustion air directly to the unit
from outdoors. A fitting is provided on the unit for final
connection. Combustion air piping must be supported
per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2. Vent Connector (FIG.
provide a passageway for conveying combustion gases to
the outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per
the National Building Code, Section 305, Table 305.4 or
as local codes dictate.
Figure 3-10 Near Boiler Stainless Steel Venting
Models 55 - 399
3" S.S. INTERMEDIATE
(FOR SAF-T VENT ONLY)
REPLACE APPLIANCE
SECURED CPVC ADAPTER
WITH APPROPRIATE
STAINLESS STEEL ADAPTER
FROM TABLE 3B
The Knight wall mount boiler uses model specific combustion
air intake and vent piping sizes as detailed in Table 3C.
Increasing or decreasing the size of the
NOTICE
combustion air or vent piping beyond the
sizes listed in Table 3C is not authorized.
(continued)
Intake
Boiler Intermediate
Air
Adapter Adapter
Termination
WH0002
303889 9353BUREZ-1*
WH1003
FSAIH04
WH3004 9454BUREZ-1*
303888
air intake/vent
3-10) - Used to
VENT
Installation & Operation Manual
Heat Fab
Saf-T Vent
Intake
Flue
Air
Termination
Termination
9392
9314TERM
5300CI
9492
9414TERM 2SVAKA04
5400CI
Maximum allowable combustion air and
vent piping lengths are as follows:
Table 3C Maximum Combustion Air and Vent Piping
Lengths
2" Max Vent/
Model
Air
55 *80 feet
85 *50 feet
110 *40 feet
155 N/A
199 N/A
285 N/A
399 N/A
For Models 55, 85, and 110 using 2" venting
*
WARNING
and Model 285 using 3" venting, the first
seven (7) equivalent feet of vent must
be CPVC (field supplied). This includes
any transition piece used to increase or
decrease the vent diameter.
Note: The minimum combustion air and vent piping length is
12 equivalent feet.
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow, 3 feet for each 45° elbow, and 3
feet for the concentric vent kit, see example below.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit = 49 equivalent feet of piping.
Z Flex
Z-Vent
Boiler Flue Intake Air
Adapter Termination Termination
2SVAKA02
2SVSTP03
2SVSTEX0390
2SVSRCX03
2SVAKA03
2SVSTP04
2SVSTEX0490
2SVSRCX04
3" Max Vent/ 4" Max Vent/
Air Air
100 feet N/A
100 feet N/A
100 feet N/A
100 feet N/A
100 feet N/A
*50 feet 100 feet
N/A 100 feet
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