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6
Installation
4
1
Fig. 32 Vertical concentric venting system (sealed combustion)
[1]
exhaust 4" (100 mm)
[2]
intake 4" (100 mm)
[3]
12" (300 mm) over max. snow level or 24" (600 mm) whichever
is greater
[4]
10"- 0" MIN (250 mm - 0 mm MIN)
Do not exceed the total equivalent venting length of 100 feet (30,480
mm) maximum requirement each for the intake and exhaust piping.
NOTICE
▶ Appliance input rates are based on minimum vent
length operation. Longer vent lengths (up to
maximum) will reduce the input proportionally.
Friction losses
45° elbow 4", PVC, CPVC
90° elbow 4", PVC, CPVC
4" plastic pipe per foot, PVC, CPVC
parallel vent kit
concentric PVC terminal 4"/6" (100/150 mm)
45° elbow 4" (100 mm), PolyPro Elbow
45° elbow 4"/6" (100/150 mm), PolyPro Elbow
90° elbow 4" (100 mm), PolyPro Elbow
90° elbow 4"/6" (100/150 mm), PolyPro Elbow
4" (100 mm) PolyPro Pipe per foot
concentric 4"/6" (100/150 mm), PolyPro Pipe per foot 3.3
4" (100 mm) PolyPro Flex pipe per foot
parallel PolyPro Wall terminal 4" (100 mm)
concentric PolyPro Wall terminal 4"/6" (100/150 mm) 20.3
concentric PolyPro Roof terminal 4"/6" (100/150 mm) 26.0
PolyPro Roof terminal Flex Chimney Cap
Table 8 Friction Loss Equivalent in piping and fittings
22
3
2
6720645916-101.1N
Equivalent
feet
m
4
1.22
7
2.13
1
0.30
2
0.61
20
6.1
7.2
2.2
3.7
1.14
11.8
3.6
5.6
1.72
3.3
1.0
1.0
6.9
2.1
13.8
4.2
6.2
7.9
3.3
1.0
See table 8 for the Friction Loss Equivalent in piping and fittings.
Example:
When you end up using 3 x 45° -elbows and the concentric roof terminal,
then the total venting length may not exceed 68 ft. (20.72 m).
3 × 45°-elbow = 3 x 4 ft. (1.22 m) =
concentric roof terminal 4"/6" =
Total friction loss equivalent =32 ft. (9.76 m)
Total venting length for this example is:
GB162-L.B. 80 kW/100kW = 100 ft. (30.48 m) - 32 ft. (9.76 m) =
68 ft. (20.72 m) each for the intake and exhaust piping.
NOTICE
▶ The minimum covering wall thickness is 1"
(25.4 mm). The maximum covering wall thickness is
16" (406 mm).
▶ For direct venting properly reassemble and reseal
the vent and air-intake systems.
CAUTION:
▶ Vent connectors serving appliances vented by
natural draft shall not be connected into any portion
of mechanical draft systems operating under
positive pressure.
At the time of removal of an existing boiler, the following steps shall be
followed with each appliance remaining connected to the common
venting system placed in operation, while the other appliances
remaining connected to the common venting system are not in
operation:
a) Seal any unused openings in the common venting system.
b) Visually inspect the venting system for proper size and horizontal
pitch and determine there is no restriction, leakage, corrosion and other
deficiencies which could cause unsafe condition.
c) Place in operation the appliance being inspected. Follow the lighting
instructions. Adjust thermostat so appliance will operate continuously.
d) Test for spillage at the draft hood relief opening after 5 minutes of
burner operation. Use the flame of a match or candle, or smoke from a
cigarette, cigar or pipe.
e) Any improper operation of the common venting system should be
corrected so the installation conforms with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and
Propane Installation Code.
When resizing any portion of the common venting system, the common
venting system should be resized to approach the minimum size as
determined using the appropriate tables in Part 11 of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural
Gas and Propane Installation Code.
Logamax plus GB162-L.B. 80 kW / 100 kW – 6720645916 (2014/10)
12 ft. (3.66 m)
20 ft. (6.10 m).
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