GF-5050
Innovation Series & ReCon Water Heater
TAG-0043_0Q
Venting and Combustion Air Guide
Page
8
of
39
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
12/01/2016
1.7. EXHAUST MUFFLER GUIDELINES
Both Innovation and ReCon units require an exhaust muffler when they are installed in a noise-
sensitive application and
when the exhaust vent ducting is relatively short in length. The following
criteria should be used to determine when to include a field-installed muffler in an Innovation and
ReCon installations:
•
The total linear length from exhaust to termination is less than 25 linear feet (7.5 linear m) in
length and the vent terminates in close proximity to residences, offices, hotel/hospital rooms,
classrooms etc.
For
manifolded exhaust
systems, the total vertical section includes only the common vertical;
individual unit vertical connectors are not included in the determination.
EXAMPLE: If the installation has a 20 foot (6.1 m) common vertical, and each unit has a
10-foot vertical connector, the total vertical section is only 20 feet (6.1 m). Because this length
is less than 25 linear feet (7.5 m), a muffler is required.
If the muffler must be mounted horizontally, add a condensate drain and trap with the drain port
oriented downward.
Contact your local AERCO sales representative for more information on the AERCO exhaust
muffler.
1.8. EXHAUST FANS
If the Innovation or ReCon water heater’s exhaust system incorporates an exhaust fan, the system
designer must size the vent pipe diameters, select the fan and determine the location of the fan
sensor to maintain a -0.1” to +0.25” W.C. (-25 Pa to 62 Pa) pressure range at the outlet of each boiler.
Also, the designer must ensure that the exhaust fan material is acceptable for use with Category IV
appliances.
1.9. ELBOW QUANTITY AND SEPARATION
The quantity and angle of elbows and the distances between them can influence the system’s exhaust
and combustion air pressures, as well as its acoustical behavior. Designers should consider
minimizing the quantity of elbows in the design and the use of angles less than 90°, whenever
possible. Five or fewer elbows are recommended for individual venting/connections; five or fewer are
recommended for common sections.
The minimum distance required between two elbows is 5
feet (1.52 m)
.
