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Page 16

LAARS Heating Systems

Other methods of introducing combustion and ventilation air
are acceptable, providing they conform to the requirements in
the applicable codes listed above.

In Canada, consult local building and safety codes or, in

absence of such requirements, follow CAN/CSA B149.

Ducted Combustion Air

The combustion air can be taken through the wall, or through
the roof. When taken from the wall, it must be taken from

out-of-doors by means of the LAARS horizontal wall

terminal, kit, See Table 7.
See Table 4 to select the appropriate diameter air pipe.

When taken from the roof, a field-supplied rain cap or an

elbow arrangement must be used to prevent entry of rain

water. (See Figure 15)
Use ABS, PVC, CPVC or galvanized pipe for the combustion

air intake. (See Table 4.) The pipe should be sized per Table

2. Route the intake to the boiler as directly as possible. Seal

all joints. Provide adequate hangers. The unit must not support
the weight of the combustion air intake pipe. Maximum linear

pipe length allowed is shown in Table 4. Subtract 5 allowable

linear ft. (1.5m) for every elbow used.

The connection for the intake air pipe is at the top of the unit.

In addition to air needed for combustion, air shall also be

supplied for ventilation, including air required for comfort
and proper working conditions for personnel. Refer to the
applicable codes.

3.3 Venting

The NeoTherm is a Category IV appliance and may be

installed with PVC and CPVC that complies with ANSI/

ASTM D1785 F441, polypropylene that complies with

ULC-S636 Class IIb, or a stainless steel venting system that

complies with UL 1738 Standard. (See Table 6)

The unit’s vent can terminate through the roof, or through an
outside wall.

When using PVC/CPVC for vent material, venting must be

connected to the CPVC section included with NeoTherm sizes

80-850. The CPVC vent section included with the NeoTherm

may be broken by CPVC fittings if necessary, but never

reduced in total length. See Table 4 to select the appropriate

vent pipe diameter. When using polypropylene, all vent
material must be produced by the same manufacturer, and

have a ULC-S636 rating.

All installations should be done following the vent supplier’s

recommended installation techniques. If manufacturer’s

instructions are not available for the material used, follow the
Laars recommendations.

Route vent pipe to the heater as directly as possible. Please see

Table 4 on page 13 for proper diameter vs. length allowed.

NOTE: The vent pipe must pitch upward, toward the vent

terminal, not less than 1/4” per foot, so that condensate

will run back to the NeoTherm and drain out thru the
condensate trap. Horizontal portions of the venting system
must be supported to prevent sagging and may not have any
low sections that could trap condensate. Seal all joints and
provide adequate hangers as required in the venting system

manufacturer’s Installation Instructions. The unit must not

support the weight of the vent pipe.

REMARQUE : Acheminer le tube d’évent à l’appareil de
chauffage le plus directement possible. Veuillez voir le

tableau 4 à la page 13 pour le bon diamètre vs. longueur

autorisée. Le tuyau d’évacuation doit pitch vers le haut, vers

la borne d’évent, pas moins de 1/4 “ par pied, de sorte que les

condensats courir vers l’NeoTherm et écouler thru le réservoir

des condensats. Portions horizontales du système d’aération

doit être soutenu pour empêcher l’affaissement et peut ne pas
avoir de faibles sections qui pourraient piéger des condensats

IMPORTANT NOTE ABOUT COMMON VENTING:

single vent that is shared by multiple NeoTherm units

MUST be engineered by a competent venting specialist,

and involves the selection of draft inducing equipment,

hardware and controls to properly balance flue gas

pressures.

Do not common vent NeoTherm units

unless the vent system meets this requirement.

NeoTherm units are never permitted to share a vent

with Category I appliances.

WARNING

Failure to use polypropylene CPVC or stainless steel

venting for the first 20” (285-600) / 30” (199 / 210)

of vent material or for any part of the venting that is

installed inside a closet may lead to property damage,

personal injury or death. The proper length of this

material is supplied with boiler. Boilers in the U.S. may

use pipe included with the boiler.

Failure to use the appropriate vent material, installation

techniques, glues/sealants could lead to vent failure

causing property damage, personal injury or death.

All venting must be installed according to this manual

and any other applicable local codes, including but

not limited to, ANSI Z223.1/NFPA 54, CSA B149.1,

CSAB149.2 and ULC-S636. Failure to follow this manual

and applicable codes may lead to property damage,

severe injury, or death.

The flue temperature of the NeoTherm changes

dramatically with changes in operating water
temperature. Therefore, it is necessary to assess the
application of the boiler to determine the required

certified vent class. If the NeoTherm is installed in an

application where the ambient temperature is elevated,
and/or installed in a closet/alcove, polypropylene, CPVC
or stainless steel material is required. If the system
temperatures are unknown at the time of installation,
Class IIB or higher venting material is recommended.