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X. Modular installation
A. General Guidelines
1. Read and follow all venting, combustion air,
water piping, gas piping and electrical instructions
contained in the Installation, Operating and Service
Instructions unless otherwise instructed in this
section.
2. Consult Local Building Codes or National Fuel Gas
Code, NFPA 54/ANSI Z222.3 for restrictions and
instructions on modular boiler installations.
B. Modular Boiler Venting System Arrangements
Using CPVC/PVC pipe for Individual Module Vent
Piping – (See Figure 40)
1. Each individual module (boiler) must have own
vent pipe and vent terminal. Refer to Section IV
“Venting” of these Instructions for individual
module (boiler) venting guidelines and options.
WaRning
no common manifolded venting (vent piping and
vent terminals) is permitted.
2. The individual module (boiler) maximum vent
length is sixty (60) equivalent feet.
3. For side wall 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.
4. Individual module (boiler) sidewall vent terminals
must be placed at least twelve (12) inches above the
ground plus the expected snow accumulation.
5. 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.
Using PVC Pipe for Individual Module Combustion
Air Intake Piping – (See Figure 40)
1. Each individual module (boiler) must have own
combustion air intake pipe and combustion air
intake terminal. Refer to Section IV “Venting” of
these Instructions for individual module (boiler)
combustion air intake guidelines and options.
2. The individual module (boiler) maximum
combustion air intake pipe length is sixty (60)
equivalent feet.
3. If possible, locate each individual module (boiler)
both combustion air intake termination and vent
termination on the same side wall, to prevent
nuisance boiler shutdowns.
However, if same side wall placement is
problematic, an individual module (boiler) may
be installed using vertical venting and side wall
combustion air intake termination (or, vice versa)
Using Concentric Combination Venting/Combustion
Air Intake Piping - Inner Polypropylene Vent
Pipe/Outer Combustion Air Intake Steel Pipe Casing
– (See Figure 40)
1. Each individual module (boiler) must have own
concentric vent pipe and vent termination. Follow
Section IV “Venting” of these Instructions for
individual module (boiler) concentric venting
guidelines.
WaRning
no common manifolded concentric venting is
permitted.
2. The individual module (boiler) maximum concentric
vent length is sixty (60) equivalent feet.
3. 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.
4. Individual module (boiler) sidewall concentric
vent terminals must be placed at least twelve (12)
inches above the ground plus the expected snow
accumulation.
5. 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.