Multiple Boiler Installation Venting - Burnham Apex APX399 Installation, Operating And Service Instructions

iV. Venting
G. Multiple Boiler Installation Venting (continued)
G.

Multiple Boiler Installation Venting

1. CPVC/PVC or Polypropylene Venting
a. Multiple Boiler CPVC/PVC or polypropylene
direct venting is shown in Figure 32.
b. Each individual module (boiler) must have own
vent pipe and vent terminal. Refer to Paragraphs
B thru E (as applicable) for individual module
(boiler) venting guidelines and options.
Warning
no common manifolded venting (vent piping and
vent terminals) is permitted.
c. The individual module (boiler) maximum vent
length - see Table 8.
d. For sidewall venting the minimum horizontal
distance between any adjacent individual module
(boiler) vent terminations is twelve (12) inches.
Additional horizontal spacing between any adjacent
individual module (boiler) vent terminations as well
as extending the distance from building surfaces
to vent termination end are recommended to avoid
frost damage to building surfaces where vent
terminations are placed.
CaUTiOn
installing multiple individual module (boiler) vent
terminations too close together may result in
combustion product water vapor condensation
on building surfaces, where vent termination are
placed, and subsequent frost damage. To avoid/
minimize frost damage, extend the distance from
building surfaces to vent termination end and
increase the horizontal distance between adjacent
vent terminations.
e. Individual module (boiler) sidewall vent
terminals must be placed at least twelve (12)
inches above the ground plus the expected snow
accumulation.
f. Multiple individual module vertical vent pipes
may be piped through a common conduit or
chase so that one roof penetration may be made.
The minimum horizontal distance between any
adjacent individual module (boiler) roof vent
terminations is one (1) foot.
2. PVC Pipe Air Intake Piping
a. Multiple Boiler PVC air intake piping is shown
in Figure 32.
b. Each individual module (boiler) must have own
combustion air intake pipe and combustion air
intake terminal. Refer to Paragraphs B thru E
(as applicable) for individual module (boiler)
combustion air intake guidelines and options.
40
c. The individual module (boiler) maximum
combustion air intake pipe length - see Table 8.
d. If possible, locate each individual module
(boiler) both combustion air intake termination
and vent termination on the same sidewall, to
prevent nuisance boiler shutdowns.
However, if same sidewall placement is
problematic, an individual module (boiler) may
be installed using vertical venting and sidewall
combustion air intake termination (or, vice versa)
3. Concentric Combination Venting/Combustion
Air Intake Piping
a. Concentric Combustion Venting and air intake is
shown in Figure 33.
b. Each individual module (boiler) must have
own concentric vent pipe and vent termination.
Follow Section IV "Venting" of this manual for
individual module (boiler) concentric venting
guidelines.
Warning
no common manifolded concentric venting is
permitted.
c. The individual module (boiler) maximum
concentric vent length - see Table 8.
d. For sidewall venting any adjacent individual
module (boiler) concentric vent terminals must
be spaced no closer than 12 inches horizontally
and three (3) feet vertically from each other to
prevent combustion air contamination.
Additional horizontal spacing between any
adjacent individual module (boiler) concentric
vent terminations and increased distance from
building surfaces to concentric vent termination
end are recommended to avoid frost damage to
building surfaces where vent terminations are
placed.
e. Individual module (boiler) sidewall concentric
vent terminals must be placed at least twelve
(12) inches above the ground plus the expected
snow accumulation.
f. For vertical through the roof venting any
adjacent individual module (boiler) vertical
vent terminals, if level with each other, must be
spaced no closer than 12 inches horizontally.
If vertical vent terminals cannot end in one
plane, they must be spaced no closer than three
(3) feet horizontally.
g. Chimney chase concentric venting is permitted
for modules, when stackable, providing
concentric vertical (roof) vent terminals, if level
with each other, are spaced no closer then 12
inches horizontally.