LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions - Manual (Page 6)

LAARS Heating Systems
Page 6
direction of fl ow. 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 fl ue
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 fl ue products blocking the natural
draft action of the venting systems. This can create a
health hazard by spilling fl ue products in the boiler room.
When the installation of a draft fan is necessary
in connecting a venting system to a Laars 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
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 fi ring 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
defi ciencies 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, in clud ing
range hoods and bath room ex hausts, so they will
operate at maximum speed. Do not operate a
summer exhaust fan. Close all fi replace dampers.
4. Place in operation the appliance being in spect ed.
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 fl ame 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, fi replace 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, 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
Installation Codes.
2.2.3 Instructions Relatives au Test des Systèmes à
Évent Commun
Au moment du restrait dʼune chaudière existante, les
mesures suivantes doivent être prises pour chaque
appareil toujours reccordé au système dʼévacuation ne
fonctionnet pas:
1.
Sceller toutes les ouvertures non utilisées du
systèmes dʼévacuation.
2. Inspecter de façon visuelle le système dʼévacuation
pour déterminer la grosseur et lʼinclinaison
horizontale qui conviennent et sʼassurer que le
système est exempt dʼobstruction, dʼétranglement,
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
lʼespace où les appareils toujours raccordés au
système dʼévacuation sont installés et les autres
espaces du bâtiment. Mettre en marche les séche-
uses, tous les appareils non raccordés au système
dʼévacuation common et tous les ventilateurs
dʼextraction comme les hottes de cuisinière et les
ventilateurs des salles de bain. Sʼassurer que ces
ventilateurs fonctionnent à la vitesse maximale. Ne
pas faire fonctionner les ventilateurs dʼété. Fermer
les registres des cheminées.
4. Mettre lʼappareil inspecté en marche. Suivre les
instructions dʼallumage. Régler le thermostat de
façon que lʼappareil fonctionne de façon continue.
5. Faire fonctionner le brûleur principal pendant 5 min
ensuite, déterminer si le coupe-tirage déborde à louverture
de décharge. Utiliser la fl amme dʼune chandelle ou la
fumée dʼune cigarette, dʼune cigare ou dʼune pipe.
6. Une fois quʼil a été déterminé, selon la méthode
indiquée ci-dessus, que chaque appareil raccordé
au systéme dʼévacuation est mis à lʼair libre de
façon adéquate. Remettre les portes et les fenêtres,
les ventilateurs, les registres de cheminées et les
appareils au gaz à leur position originale.