LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 10)

LAARS Heating Systems
Page 10
WARNING
Avoid ending boiler vents near air conditioning or air
supply fans. The fans can pick up exhaust flue
products from the boiler and return them inside the
building, creating a possible health hazard, resulting
in serious injury or death.
MISE EN GARDE
Éviter de placer les sorties d’évent près des
appareils de climatisation ou les ventilateurs des
prises d’air. Ces prises d’air peuvent aspirer les
résidus de combustion et les faire pénétrer à
l’intérieur de l’immeuble, ce qui peut représenter
une menace pour la santé et occasionner des
blessures corporelles sérieuses ou même la mort.
Locate unit as close as practical to a chimney or
vent termination. Have horizontal runs sloping
upwards not less than 1/4 inch per foot (21mm/m)
from the boiler to the vent terminal. Support a vent
connector for the design and weight of the material
used to maintain clearances and prevent physical
damage and separate of joints.
Doivent présenter des tronçons horzontaux dont
la pente montante est d’au moins 1/4 po par pied
21mm/m) entre la chaudière et l’évent. Doivent
préciser que les sections horizontales doivent être
supportées pour prévenir le fléchissement.
Always use double-wall or insulated vent pipe
(Type B or equivalent).
WARNING
In cold weather, uninsulated outside vents can chill
the rising flue products, blocking the natural draft
action of the venting system. This can create a
serious health hazard which can ultimately cause
death by spilling flue products into the boiler room.
MISE EN GARDE
Dans les régions froides, les évents non isolés
peuvent occasionner la condensation des résidus
de combustion qui y circulent, ce qui a pour effet de
réduire le tirage naturel du système d’évacuation
des résidus. Cela peut représenter une sérieuse
menace pour la santé, pouvant même provoquer la
mort en causant le refoulement des résidus de
combustion dans la chaufferie.
Avoid oversize vent piping or extremely long
runs of the pipe which may cause too much cooling
and condensation of flue gases.
When the installation of a power vent or draft fan
in the venting system is necessary, qualified personnel
should design the installation following good
engineering practices and all applicable codes. A
suitable draft switch must be wired into the boiler
control circuit at the terminal designated Field
Interlock to keep the boiler from firing unless there is a
positive draft.
2.5.2 Common Venting Systems
Venting Multiple Appliances
When installing venting for a Mighty Therm Lo-
NOx boiler or water heater installed as a Category I
fan-assisted appliance with other Category I appliances
through one shared duct called a “common vent”,
special care must be taken by the installer to ensure
safe operation. In the event that the common vent is
blocked, it is possible, especially for fan-assisted
devices, to vent backwards through non-operating
appliances sharing the vent, allowing combustion
products to infiltrate occupied spaces. If the
appliances are allowed to operate in this condition,
serious injury or death may occur.
WARNING
Operation of appliances with a blocked common
vent may lead to serious injury or death. Safety
devices must be implemented to prevent blocked
common vent operation. If safe operation of all
appliances connected to a common vent cannot be
assured, including prevention of spillage of flue
gasses into living spaces, common venting should
not be applied, and appliances should each be
vented separately.
AVERTISSEMENT
Le fonctionnement des appareils avec un système
d’évacuation bloqué peut provoquer des blessures
graves, voire la mort. Des dispositifs de sécurité
doivent être installés pour éviter le blocage des
systèmes d’évacuation. Si le fonctionnement de
tous les appareils connectés à un système
d’évacuation commun ne peut pas être assuré, y
compris la prévention de la dispersion des gaz
toxiques dans les espaces habités, on ne devrait
pas installer un système d’évacuation commun et
chaque appareil devrait être ventilé séparément.
It is for this reason that, in addition to following
proper vent sizing, construction and safety
requirements from the National Fuel Gas Code, ANSI
Z223.1 or in Canada, from CSA B149.1 as well as all
applicable local codes, it is required that installers
provide some means to prevent operation with a
blocked common vent. It is suggested that a blocked
vent safety system be employed such that if the switch
from one appliance trips due to excessive stack spill or
backpressure indicating a blocked vent condition, that
all appliances attached to the vent be locked out and
prevented from operating. As an additional precaution,
it is recommended that a Carbon Monoxide (CO)
OUT OF
PRODUCTION