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Avoid using long horizontal runs of the vent pipe,
and too many 90° elbows, reductions or restrictions.
Horizontal runs should have at least a
1/4" (6mm) rise per foot in the direction of flow. A
vent connector should be supported for the design and
weight of the material used to maintain clearances and
prevent physical damage and separation of joints.
Avoid terminating heater vents near air
conditioning or air supply fans. The fans can pick up
exhausted flue products from the heater and return
them inside the building creating a possible health
hazard. A minimum of 4 feet (1.2m), in Canada 6 feet
(1.8m), horizontal distance must be maintained from
electrical meters, gas meters, and relief equipment.
Always use double-wall or insulated vent pipe
(Type B or equivalent). In cold weather, uninsulated
outside vents can chill the rising flue products blocking
the natural draft action of the venting systems. This
can create a health hazard by spilling flue products in
the heater room.
When the installation of a draft fan is necessary
in connecting a venting system to this heater, the
installation should be engineered by competent
personnel following good engineering practices. The
draft fan supplier should be consulted for correct
size. The installation should be in accordance with
the latest edition of ANSI Z223.1 and/or, in Canada,
CSA B149.1 and any local codes having jurisdiction.
When a draft fan is installed, a suitable draft switch
must be wired into the heater control circuit at terminal
designated "Field Interlock" to prevent firing of the
heater unless a positive draft has been established.
2.2.3 Common Venting System
Test Procedure
At the time of the removal of an existing
heater, the following steps shall be followed with
each appliance remaining connected to the common
venting system. During the testing of each unit, the
other appliances remaining connected to the common
venting system should not be operated.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch. Determine that there is no
blockage or restriction, leakage, corrosion, or other
deficiencies which could cause an unsafe condition.
3. Insofar as it is practical, close all building doors
and windows. Also close all doors between the
space in which the appliances remaining connected
to the common venting system are located and the
other spaces of the building. Turn on any clothes
dryer and any appliance not connected to the
common venting system. Turn on any exhaust fans,
including range hoods and bathroom exhausts,
so they will operate at maximum speed. Do not
operate a summer exhaust fan. Close all fireplace
dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions for the unit.
Adjust the thermostat so the appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use
the flame of a match or candle, or smoke from a
cigarette, cigar, or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return doors, windows, exhaust fans,
fireplace dampers and any other gas-burning
appliance to their previous condition of use.
7. Any improper operation of the common venting
system should be corrected so the installation
conforms with the
National Fuel Gas Code,
ANSI Z223.1
and/or
CSA B149.1, Installation
Codes
. 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
Appendix G in the
National Fuel Gas Code, ANSI
Z223.1
and/or
CSA B149.1 Installation Codes
.
2.2.4 Instructions
Relatives au Test des Systèmes à
Évent
Commun
Au moment du restrait d’une chaudière existante, les
mesures suivantes doivent être prises pour chaque
appareil toujours reccordé au système d’évacuation ne
fonctionnet pas:
1. Sceller toutes les ouvertures non utilisées du systèmes
d’évacuation.
2. Inspecter de façon visuelle le système d’évacuation
pour déterminer la grosseur et l’inclinaison
horizontale qui conviennent et s’assurer que le
système est exempt d’obstruction, d’étranglement, de
fuite, de corrosion et autres défaillances qui pourraient
présenter des risques.
3. Dans la mesure du possible, fermer toutes les
portes et les fenêtres du bâtiment et toutes les
portes entre l’espace où les appareils toujours
raccordés au système d’évacuation sont installés et
les autres espaces du bâtiment. Mettre en marche
WARNING
Chemicals stored in the equipment room may
cause corrosion. Sodium hypochlorite feeders,
vented tablet containers, pellet salt and other
chemicals may off-gas into the air in the room
and be drawn into the combustion and dilution
air, corroding the pool heater's metalic parts.
Corrosion damage is not covered under the
limited warranty.
LAARS Heating Systems
