Innovation Water Heaters
– Edge [i] Controller
Venting and Combustion Air Design Guide
TAG-0090_A
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GF-5056
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2/20/2020
Technical Support
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(800) 526-0288
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The vent system for Innovation-Edge heate
rs must be installed in accordance with AERCO’s
installation instructions described in this guide.
CAUTION
For Category IV and II Heaters, the vents must be installed to prevent accumulation of
condensate, and have means provided for drainage of condensate.
3.1.
Vent Installation
1. The heaters covered in this section are design-certified as Category II and IV for venting, only
when they are installed with manufacturer specified vent system components and installation
practices.
2. Install vent pipe beginning at the water heater exhaust manifold and work toward the vent cap.
The first section (starter section) must be straight for a minimum of 24 inches (61 cm).
Start by cleaning the top surface of the exhaust manifold and the mating flange section of the
duct starter piece with an alcohol swab and then apply a bead of high temperature red silicon
sealant (such as Permatex Hi-Temp Red RTV or Loctite Superflex Red High Temp RTV) to
that surface (see Figure 8, below).
3. Attach the exhaust connector to the exhaust manifold using the screws supplied with the kit.
Use a cross-tip (Phillips) screwdriver at least 12 inches (305 mm) long. See Figure 1 (page 7)
for the list of available exhaust vent connectors.
4. Vent connectors serving appliances vented by natural draft shall not be connected into any
portion of mechanical draft systems operating under positive pressure
5. For Innovation-Edge water heaters, horizontal runs shall be sloping upwards
not less than
1/4 inch per foot (21 mm/m)
from the heater to the vent termination.
6. The instructions for the installation of the venting system shall specify that the horizontal
portions of the venting system shall be supported to prevent dips or sags where condensate
could collect.
7. Rigidly support vent pipe every 5 feet (1.5 m) and at each elbow. Plumber straps may be used.
8. In a multiple unit common venting setup, to prevent internal exhaust gas recirculation when a
unit is disabled/off, allow for at least 10 feet (3.1 m) of common vertical as a rule of thumb
9. Clearances and enclosures. ALL vent pipe and fittings must be installed with appropriate air
space clearances to combustibles, per UL 1738. These air space clearances apply to indoor
or outdoor vents, whether they are open, enclosed, horizontal or vertical or pass through
floors, walls, roofs, or framed spaces. The appropriate air space clearances should be
observed between joists, studs, sub floors, plywood, drywall, or plaster enclosures, insulated
sheathing, rafters, roofing, and any other combustible material. The minimum air space
clearance also applies to electrical wires and any kind of building insulation.
