Innovation Water Heaters
– Edge [i] Controller
Venting and Combustion Air Design Guide
TAG-0090_A
•
GF-5056
•
2/20/2020
Technical Support
•
(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 26 of 39
Figure 12: Transition Vent Sections
The vent system should always be pitched up 1/4 inch per foot (21 mm/m) of run towards the vent
termination (see Figure 13). This will enable condensate to drain back to the unit for disposal.
Low spots in the vent must be avoided. Inspect periodically to ensure correct drainage.
As shown in Figure 13, the unit at the end of the vent main must be connected via an elbow. An
end cap must not be used as it may cause vibration and flue pressure fluctuations.
As discussed previously, the
static regain
method should
NOT
be used for common ductwork,
but rather, the one duct size should be used for the common run.
AERCO Water Heater venting should never be interconnected with other manufacture
rs’
equipment.
Figure 13: Connection of Unit at End of Vent Main
3.6.
Common Vent CONDENSATE DRAINAGE
A condensate drain must be located in the common vent portion of the flue system. The drain
must be located to collect condensate flow from the common duct to prevent backflow into the
first heater, as shown in Figure 13.
