AHRI APEX, Installation, Operating And Service Instructions

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ii. Combustion Air Termination
• After penetrating wall, install a 90°
elbow so that the elbow leg is in the up
direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of combustion air pipe as shown
in Figure 6B.
• At top of vent pipe length install another
90° elbow so that the elbow leg is
opposite the building’s exterior surface.
• Install rodent screen (not supplied) and
horizontal vent terminal.
• Brace exterior piping if required.
5. Vertical Vent Termination
a. Standard Two-Pipe Termination
See Figures 7 and 8.
i. Vent Termination
• Use the terminal supplied by the vent
system manufacturer shown in Table
11B. Follow manufacturer’s instructions
to attach terminal to vent system.
ii. Combustion Air Termination
• Install vertical combustion air terminal.
Vertical combustion air terminal consists
of a 180° bend (comprised of two 90°
elbows) as shown in Figure 7.
• Install rodent screen (not supplied) in the
combustion air terminal. Use a screen
having 1/2 in. x 1/2 in. (13 mm x 13 mm)
or larger mesh.
E. Removing the Existing Boiler
When an existing boiler is removed from a common
venting system, the common venting system is likely
to be too large for proper venting of the remaining
appliances. At the time of removal of an existing
boiler, the following steps shall be followed with each
appliance remaining connected to the common venting
system placed in operation, while the other appliances
remaining connected to the common venting system are
not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion, and other
deficiencies which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance
not connected to the common venting system.
Turn on any exhaust fans, such as range-hoods and
bathroom exhausts, so they will operate at maxi mum
speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Place in operation the appliance being inspected.
Follow the Lighting (or Operating) Instructions.
Adjust thermo stat so 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
remain ing connected to the common venting system
properly vents when tested as outlined above, return
doors, win dows, exhaust fans, fireplace dampers and
any other gas burning appliance to their previous
conditions 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/NFPA 54 and/or the Natural Gas and
Propane Installation Code , CAN/CSA B149.1.
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 Part II in the National
Fuel Gas Code , ANSI Z223.1/NFPA 54 and/or the
Natural Gas and Propane Installation Code , CAN/
CSA B149.1.
Au moment du retrait d’une chaudière existante, les
mesures suivantes doivent être prises pour chaque
appareil toujours raccordé au système d’evacuation
commun et qui fonctionne alors que d’autres appareils
toujours raccordés au système d’évacuation ne
fonctionnent pas:
1. Sceller toutes les ouvertures non utilisées du
système d’évacuation.
2. Inspecter de façon visuelle le système d’évcuation
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 les sécheuses, tous les appareils non
raccordés au système d’évacuation commun
IV. Venting
D. Stainless Steel Venting - E. Removing the Existing Boiler - F. Multiple Boiler Installation Venting
(continued)