Lochinvar Shield SNR150-100 - Manual (Page 20)

20
2
General venting
3" S.S. ADAPTER
VENT
3" S.S. INTERMEDIATE
(FOR SAF-T VENT ONLY)
Figure 3-11 Near Water Heater Stainless Steel Venting
Stainless steel air intake/vent connections
1. Combustion Air Intake Connector (FIG. 3-11) - 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. 3-11) - 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.
Table 2B Approved Stainless Steel Terminations and Adapters
Model
ProTech Heat Fab Z Flex
FasNSeal Saf-T Vent Z-Vent
Water
Heater
Adapter
Flue
Termination
Intake
Air
Termination
Water
Heater
Adapter
Intermediate
Adapter
Flue
Termination
Intake
Air
Termination
Water
Heater
Adapter
Flue
Termination
Intake Air
Termination
SNR150 -
SNR200
300715
FSBS3
FSRC3(R.C)
303889 KB80210 9353BUREZ-1*
9392
5300CI
9314TERM 2SVSLA03
2SVSTP03
2SVSRCX03
2SVSTEX0390
SNA285 -
SNA500
F303759
FSBS4
FSRC4(R.C.)
FSAIH04
303888
KB285600 9454BUREZ-1*
9492
5400CI
9414TERM 2SVSLA04
2SVSTP04
2SVSRCX04
2SVSTEX0490
* = This adapter must be used in addition to the water heater adapter for Saf-T vent pipe as shown in FIG. 3-11, unless approved
vent other than standard diameter is used. Consult a Heat Fab representative for questions.
The Shield water heater uses model specific combustion air
intake and vent piping sizes as detailed in Table 2C below.
Model Air Intake Vent
SNR150-100 -- SNR200-100 3 inches 3 inches
SNA285-125 -- SNA500-125 4 inches 4 inches
Table 2C Air Intake/Vent Piping Sizes
Increasing or decreasing combustion air
or vent piping is not authorized.
NOTICE
Models SNA400-125 and SNA500-125 will de-rate 1.75% per
25 feet of vent when installed as direct vent or 0.75% per 25
feet of vent when drawing combustion air from the room.
Models SNR150-100 through SNA285-125 will de-rate up to
1% per 25 feet of vent pipe when installed as direct vent, but
will not de-rate when drawing combustion air from the room.
Minimum / Maximum allowable combustion
air and vent piping lengths are as follows:
Vent = 12 equivalent feet minimum / 100 equivalent feet
maximum
Combustion Air (when used) = 12 equivalent feet minimum /
100 equivalent feet maximum
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow and 3 feet for each 45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit (CVK3003) = 49 equivalent
feet of piping.
Installation & Service Manual TM