Lochinvar KNIGHT WH 55 - 399 - Manual (Page 19)

3
General venting
(continued)
VENT
3" S.S. INTERMEDIATE
(FOR SAF-T VENT ONLY)
REPLACE APPLIANCE
SECURED CPVC ADAPTER
WITH APPROPRIATE
STAINLESS STEEL ADAPTER
FROM TABLE 3B
Figure 3-10 Near Boiler Stainless Steel Venting
Models 55 - 399
Stainless steel air intake/vent
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. 3-10) - Used to
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.
Maximum allowable combustion air and
vent piping lengths are as follows:
Model
2" Max Vent/
Air
3" Max Vent/
Air
4" Max Vent/
Air
55 *80 feet 100 feet N/A
85 *50 feet 100 feet N/A
110 *40 feet 100 feet N/A
155 N/A 100 feet N/A
199 N/A 100 feet N/A
285 N/A *50 feet 100 feet
399 N/A N/A 100 feet
Increasing or decreasing the size of the
combustion air or vent piping beyond the
sizes listed in Table 3C is not authorized.
NOTICE
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.
Table 3C Maximum Combustion Air and Vent Piping
Lengths
Note: The minimum combustion air and vent piping length is
12 equivalent feet.
The Knight wall mount boiler uses model specific combustion
air intake and vent piping sizes as detailed in Table 3C.
19
Installation & Operation Manual
Table 3B Approved Stainless Steel Terminations and Adapters
Model
ProTech Heat Fab Z Flex
FasNSeal Saf-T Vent Z-Vent
Boiler
Adapter
Flue
Termination
Intake
Air
Termination
Boiler
Adapter
Intermediate
Adapter
Flue
Termination
Intake
Air
Termination
Boiler
Adapter
Flue
Termination
Intake Air
Termination
55 - 85 303005
FSBS3
FSRC3(R.C)
303889
WH0002
9353BUREZ-1*
9392
5300CI
9314TERM
2SVAKA02 2SVSTP03
2SVSRCX03
2SVSTEX0390
110 -285 303006 WH1003 2SVAKA03
399 303007
FSBS4
FSRC4(R.C)
FSAIH04
303888
WH3004 9454BUREZ-1*
9492
5400CI
9414TERM 2SVAKA04
2SVSTP04
2SVSRCX04
2SVSTEX0490
* = 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.
For Models 55, 85, and 110 using 2" venting
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.
* ƽ WARNING