Watts Aerco INN 600N User manual

Heating and Hot Water Solutions
AERCO International, Inc. • 100 Oritani Drive • Blauvelt, NY 10913
USA: T: [phone] • Toll Free: [phone] • AERCO.com
Technical Support • [phone] • Mon-Fri, 8 am - 5 pm EST
© 2020 AERCO
TAG-0090_B •GF-5056 •2/20/2020
Venting and Combustion
Air Design Guide
Applies to models:
•INN 600N
•INN 800N
•INN 1060N
•INN 1350N
Innovation Water Heaters
With Edge [i] Controller
Disclaimer
The information contained in this manual is subject to change without notice
from AERCO International, Inc. AERCO makes no warranty of any kind with
respect to this material, including, but not limited to, implied warranties of
merchantability and fitness for a particular application. AERCO International is
not liable for errors appearing in this manual, not for incidental or consequential
damages occurring in connection with the furnishing, performance, or use of
these materials.

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Table of Contents
1. CODES, SAFETY & VENTING SYSTEMS ................................................... 3
1.1. Introduction.....................................................................................................................3
1.2. Applicable Federal Codes ..............................................................................................3
1.3. Gas Vent Categories ......................................................................................................4
1.4. Certified Venting Materials for Flue Pipe Systems .........................................................5
1.5. Exhaust Vent Connection Components..........................................................................6
1.6. PRESSURE RANGE......................................................................................................7
1.7. EXHAUST FANS............................................................................................................7
1.8. EXHAUST MUFFLER GUIDELINES..............................................................................7
1.9. Elbow Quantity and Separation......................................................................................7
2. COMBUSTION AIR SYSTEM ...................................................................... 8
2.1. Combustion Air Requirements........................................................................................8
2.2. Combustion Air from WITHIN the Building .....................................................................9
2.3. Combustion Air from OUTSIDE the Building................................................................10
1.1.1. Two-Permanent-Openings Method (USA Only).................................................10
1.1.2. One Permanent Opening Method......................................................................12
2.4. Combustion Air Pipe Sizing..........................................................................................14
2.5. Common Combustion Air Systems...............................................................................15
3. VENT SYSTEM ......................................................................................... 18
3.1. Vent Installation............................................................................................................19
3.2. Installation REQUIREMENTS for Venting Through a Wall...........................................21
3.3. Installation REQUIREMENTS for Vertical Venting.......................................................23
3.4. Vent Pipe Sizing ...........................................................................................................24
3.5. Common Vent Pipe Sizing............................................................................................24
3.6. Common Vent CONDENSATE DRAINAGE.................................................................26
3.7. Combustion Air Duct Pressure Drop Tables.................................................................27
3.7.1 Corrections For Altitude ........................................................................................27
3.7.2 Innovation 600N Combustion Air Duct Pressure Drop Tables..............................28
3.7.3 Innovation 800N Combustion Air Duct Pressure Drop Tables...............................31
3.7.4 Innovation 1060N Combustion Air Duct Pressure Drop Tables...........................33
3.7.5 Innovation 1350NCombustion Air Duct Pressure Drop Tables............................35
3.8. Flue Vent Pressure Drop Tables ..................................................................................37

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1. CODES, SAFETY & VENTING SYSTEMS
1.1. Introduction
The AERCO gas-fired water heater is a high efficiency, forced draft, domestic hot water heating
unit with unique venting capabilities. All venting options (which include horizontal and vertical
discharges, direct vent, and manifolded vent breeching), typically exceed the capabilities of
competing combustion equipment. These and other features enable AERCO water heaters to
provide extremely high thermal efficiencies and optimum temperature control under widely varying
conditions. It is therefore critical that the flue gas vent and combustion air system be designed to
maintain these objectives.
The high efficiency is achieved through air/fuel modulation and the release of heat energy from
the moisture condensing in the combustion products. Because condensation can occur in the
exhaust vent system, a means must be provided to remove the moisture accumulation. Each
model should be fitted with the supplied condensate removal trap.
The design guidelines in this bulletin provide broad latitude while meeting the objectives of safety,
longevity and optimum performance.
1.2. Applicable Federal Codes
UNITED STATES:
NFPA 54/ANSI Z223.1……….. National Fuel Gas Code
NFPA/ANSI 211………………. Chimneys, Fireplaces, Vents and Solid Fuel Burning
Appliances
CANADA:
CSA B149.1…………………… Installation Codes for Gas-Burning Equipment
CSA B149.2…………………… Installation Codes for Gas-Burning Equipment
The above listed codes contain information for gas vented appliances requiring Category II, III
and IV, vent sizing, location, air space clearances to combustibles and safe installation practices.
The gas vent installer must be in compliance with the above codes, as well as Local Codes and
Regulations.
WARNING!
ALL INSTALLATIONS OF WATER HEATERS AND VENTING SHOULD BE DONE ONLY BY
QUALIFIED VENTING SYSTEMS PERSONNEL AND IN ACCORDANCE WITH THE
MANUFACTURER’S RECOMMENDATIONS. INSTALLING OR VENTING A HEATER OR
ANY OTHER GAS APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY
RESULT IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATION FROM
POISONOUS GASES (CARBON MONOXIDE IS ODORLESS AND INVISIBLE).

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WARNING!
•FOR CORRECT INSTALLATION OF VENT SYSTEM, READ ALL OF THESE
INSTRUCTIONS AND REFER TO THE VENT PIPE MANUFACTURER’S
INSTRUCTIONS.
•FAILURE TO USE THE VENTING SYSTEM DESCRIBED IN THIS DOCUMENT WILL
VOID THE MANUFACTURER’S WARRANTY AND MAY RESULT IN RAPID
DETERIORATION OF THE VENTING SYSTEM, CREATING A POTENTIAL HEALTH
HAZARD.
•FAULTY VENT INSTALLATION CAN ALLOW TOXIC FUMES TO BE RELEASED INTO
LIVING AREAS. THIS MAY CAUSE SERIOUS BODILY INJURY OR PROPERTY
DAMAGE. IMPROPER ASSEMBLY MAY ALSO AFFECT VENT PERFORMANCE.
•INSTALL SEPARATE VENTS FOR FORCED EXHAUST APPLIANCES AND NATURAL
DRAFT APPLIANCES. A COMMON VENT BETWEEN NATURAL DRAFT AND FORCED
EXHAUST APPLIANCES MAY CAUSE TOXIC GASES TO EXHAUST THROUGH THE
NATURAL DRAFT APPLIANCE RATHER THAN TO OUTSIDE AIR. BREATHING
EXHAUST GASES WILL CAUSE SERIOUS PERSONAL INJURY OR DEATH.
1.3. Gas Vent Categories
Innovation-Edge water heaters are approved for a Category II and Category IV vent configuration
as well as for ducted combustion air installations.
CAUTION!
Provisions for combustion and ventilation air in accordance with Section 5.3, (Air for
Combustion and Ventilation) of the National Fuel Gas Code - ANSI Z223.1, or Sections 7.2,
7.3, or 7.4 of CAN/CSA B149.1, Installation Codes, or applicable provisions of the local building
codes.
Federal Codes have categorized gas appliances by the vented flue gas pressure and temperature
as follows:
•Category I, being a gas appliance that operates with a non-positive vent (or natural drafted
vent) connector with a flue gas pressure and temperature at least 140°F (60°C) above its
dew point.
•Category II, being a gas appliance that operates with a non-positive vent (or natural drafted
vent) connector with a flue gas pressure and temperature less than 140°F (60°C) above its
dew point.
•Category III, being a gas appliance that operates with a positive vent (fan forced vent)
connector with a flue gas pressure and temperature at least 140°F (60°C) above its dew
point.
•Category IV, being a gas appliance that operates with a positive vent (fan forced vent)
connector with a flue gas pressure and temperature less than 140°F (60°C) above its dew
point.
Direct Vent, a gas appliance is constructed and installed so that all air for combustion is derived
directly from the outdoors and all flue gases are discharged to the outdoors.

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1.4. Certified Venting Materials for Flue Pipe Systems
Innovation Water Heaters are a Category II and IV or Type BH appliance, which require special
attention to exhaust venting and combustion air details. The exhaust vent MUST be UL listed for
use with Category II and IV appliances. Consult local codes and authorities prior to installation.
The following vent materials are allowed:
•Category II or IV UL1738 or Type BH under ULCS636 listed Polypropylene and
Stainless-Steel
•Where codes allow, PVC and CPVC may be used.
•AERCO recommends the use of AL29-4C Stainless Steel and Polypropylene as the
preferred venting material for all Innovation Water Heaters.
•Stainless Steel venting thickness should conform to the following requirements:
TABLE 1: Flue System Minimum Thickness for AL29-4C in Inches (mm)
Diameter
3” to 8”
(51 –203 mm)
9” to 16”
(229 –406 mm)
18” to 24”
(457 –610 mm)
26” to 30”
(660 –762 mm)
Material Thickness
in Inches (mm)
0.015
(0.38)
0.020
(0.51)
0.024
(0.61)
0.034
(0.86)
It is the responsibility of the design engineer and installing contractor to ensure all vent system
designs and installations follow industry best practices, including proper pitch, support, and
drainage to prevent failure. While UL is the industry standard guideline for venting, It is highly
recommended that exhaust vent passing through confined or enclosed building spaces be made
of AL29-4C Stainless Steel as the most corrosion resistant vent material currently available.
Proper clearances to combustibles must be maintained per UL and vent manufacturer
requirements. The UL, National Fuel Gas Code (ANSI Z223.1/ NFPA54) and CSA B149.1-10
guidelines are often the basis for state and local codes. AERCO's recommendations follow the
guidelines of these agencies, unless more stringent codes govern the installation site. The venting
and combustion air systems must meet all applicable code requirements.
All Canada installations must comply with CSA B149.1 installation code.
CAUTION!
•The Vent Pipe Systems below are used for venting gas burning Category II and IV
appliances. Do not use these vent pipe systems for venting appliances burning fuels such
as wood, coal, oil or kerosene.
•Maintain clearances from combustible construction for heater, vent connector, and steam
and hot-water pipes.
•Do not use these vent pipe systems for incinerators of any kind.

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1.5. Exhaust Vent Connection Components
Figure 1 shows the components and part numbers for connecting the exhaust vents for the
Innovation-Edge models.
Exhaust Vent Adapters
INN 600N
INN 600N, INN 800N, INN 1060N, INN
1350N
4” (102 mm) (PVC) Kit # 24287
6” (152 mm) (PVC) Kit # 24286
INN 00N
INN 600N, INN 800N, INN 1060N, INN
1350N
6” to 4” (152 to 102 mm) DuraVent®PolyPro
Adapter P/N 39006-1
6” (152 mm) DuraVent®PolyPro Adapter P/N
39006-2
Figure 1: Exhaust Vent Connection Components

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1.6. PRESSURE RANGE
•For individually vented units, the exhaust system must be designed so that pressure
measured at every point is in the range from -0.10” W.C. to +0.81” W.C. (-25 Pa to 202
Pa).
•For common vented units, the exhaust system must be designed so that pressure
measured at every point is in the range of -0.10” W.C. to +0.25” W.C. (-25 Pa to 62 Pa).
•Pressures below -0.10” W.C. (-25 Pa) (more negative) may cause flame instability.
•Pressures above +0.25” W.C. (62 Pa) for common vented units, or +0.81 W.C. (202 Pa)
for individually vented units (more positive), will prevent flue gases from exiting.
1.7. EXHAUST FANS
If the Innovation-Edge 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
unit. Also, the designer must ensure that the exhaust fan material is acceptable for use with
Category IV appliances.
1.8. EXHAUST MUFFLER GUIDELINES
Innovation-Edge 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-Edge
installation:
•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.
1.9. 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).

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2. COMBUSTION AIR SYSTEM
WARNING
AIR OPENINGS TO COMBUSTION AREA MUST NOT BE OBSTRUCTED. USE THE
INFORMATION BELOW TO ENSURE THAT ADEQUATE COMBUSTION AIR IS
MAINTAINED.
2.1. Combustion Air Requirements
Innovation water heaters require the following combustion air volumes when operated at full
capacity:
INNOVATION-EDGE
INN 600N –130 SCFM (2.8 m3/min)
INN 800N –170 SCFM (4.8 m3/min)
INN 1060N –225 SCFM (6.4 m3/min)
INN 1350N –285 SCFM (8.1 m3/min)
These flows MUST be accommodated. Air supply is a direct requirement of NFPA 54, CSA
B149.1-10 (Canada) and local codes that should be consulted for correct design implementation.
NOTES:
1. Intakes must be located to prevent infiltration of chlorine, chlorides, halogens or any other
chemicals that are detrimental to the operation of combustion equipment. Common sources
of these chemicals are swimming pools, degreasing compounds, water softener salts,
plastic processing and refrigerants. This will ensure the longevity of the equipment and
maintain warranty validation.
WARNING:
If the equipment room is in the vicinity of any these types of chemicals, it must be supplied
with clean combustion air. The equipment room must also have a slightly positive room air
pressure, provided by a powered combustion air supply louver or duct, to prevent infiltration
of chemicals into the room.
2. When calculating free area using louvers and grilles, the required size of the openings for
combustion, ventilation, and dilution air shall be based on the total free area of each opening.
•If the free area through a designed louver or grille is known, it shall be used in calculating
the size of opening required to provide the free area specified.
•If the louver and grille design free areas are not known, the following will be assumed: For
wooden louvers a 25 percent free area; for metal louvers and grilles a 75 percent free area
opening.
3. When terminating the combustion air through the roof:
•The combustion air inlet must be 3 ft. (0.9 m) below any vent outlet within 10 ft. (3 m) (see
Figure 10).
•The combustion air inlet must also face away from the vent outlet (see Figure 10).
4. All inlet air ducts must be sealed air tight.

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5. The mechanical room must not be under negative pressure under any circumstances (even
when the combustion air is direct ducted). If necessary, ventilate the room to prevent this
condition from occurring.
WARNING
•Non-motorized louvers and grilles must be fixed in an open position.
•Minimum screens mesh size shall not be smaller than ¼ inch (6.4 mm) mesh.
6. Air intakes must not be located in the proximity of garages, industrial and medical hood
venting, loading docks or refrigerant vent lines. Water Heaters must not be installed in the
proximity of activities that generate dust if that dust can enter the Water Heater intake. Water
Heaters must be located to prevent moisture and precipitation from entering combustion air
inlets.
7. If a Water Heater is used, temporarily, to provide heat during ongoing building construction or
renovation, accumulated drywall dust, sawdust and similar particles can:
•Accumulate in the unit’s combustion air intake and block combustion air flow
•Accumulate over the burner surface and restrict flow of air/fuel mixture
In these situations, AERCO requires that a disposable air intake filter be installed, temporarily,
above the combustion air inlet. Air filters may be required year-round in instances in which
dust or debris can enter the combustion air tube. Consult the Operations and Maintenance
Manual for details.
8. Combustion air temperatures as low as -30°F (-34°C ) can be used without affecting the
integrity of the equipment; however, the combustion settings may require adjustment to
compensate for site conditions.
2.2. Combustion Air from WITHIN the Building
Wherever combustion air originates from in the building, it must be provided to the equipment
room from two permanent openings to an interior room (or rooms). Openings connecting indoor
spaces shall be sized and located in accordance with the following:
•Each opening shall have a minimum free area of 1 inch2per 1,000 BTU/hr (654 mm2/0.29
kW) of total input rating of all appliances in the space, but not less than 100 inch2(0.06
m2).
•One opening shall commence within 12 inches (305 mm) of the top of the enclosure, and
one opening shall commence within 12 inches (305 mm) of the bottom. (See Figure 2).

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Figure 2: All Combustion Air from Adjacent Indoor Spaces through Indoor
Openings
2.3. Combustion Air from OUTSIDE the Building
Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with
the methods described below. The minimum dimension of air openings shall not be less than
3 inches (80 mm). The required size of the openings for combustion air shall be based upon the
net free area of each opening. When the free area through a louver, grille, or screen is known, it
shall be used to calculate the opening size required to provide the free area specified. For
additional details, consult NFPA 54, or in Canada, CSA B149.1-10, paragraphs 8.4.1 and 8.4.3.
1.1.1. TWO-PERMANENT-OPENINGS METHOD (USA ONLY)
Two permanent openings shall be provided; one commencing within 12 inches (305 mm) of the
top of the enclosure and one commencing within 12 inches (305 mm) of the bottom. The openings
shall communicate directly ― or by ducts ― with the outdoors, or spaces that freely communicate
with the outdoors, as show on the following pages:
1. When communicating directly with the outdoors, or when communicating to the outdoors
through vertical ducts, each opening shall have a minimum free area of 1 inch2per
4,000 BTU/hr (654 mm2/1.17 kW) of total input rating of all appliances in the space (see
Figures 4 and 5).
OPENING
OPENING

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Figure 3: All Combustion Air From Outdoors - Inlet Air From Ventilated Crawl
Space and Outlet Air to Ventilated Attic
Figure 4: All Combustion Air from Outdoors –Through Ventilated Attic
TOP OPENING

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2. When communicating with the outdoors through horizontal ducts, each opening shall have
a minimum free area of 1 inch2per 2,000 BTU/hr. (654 mm2/0.59 kW) of total input rating
of all appliances in the space (see Figure 5).
Figure 5: All Combustion Air from Outdoors –Through Horizontal Ducts
1.1.2. ONE PERMANENT OPENING METHOD
One permanent opening shall be provided, commencing within 12 inches (305 mm) of the top of
the enclosure. The opening shall communicate with the outdoors directly or through a vertical or
horizontal duct to the outdoors or spaces that freely communicate with the outdoors (as shown in
Figure 6) and shall have a minimum free area as follows:
•1 inch2per 3,000 BTU/hr (654 mm2/0.88 kW) of the total input rating of all appliances
located in the space.

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Figure 6: All Combustion Air from Outdoors Through Single Combustion Air
Opening
The following table lists the minimum required air openings in square inches (square centimeters)
freely communicating with the outdoors for mechanical room combustion and ventilation air for
each unit. For multiple unit installations, sum the openings for the specific heater sizes.
OPENING

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TABLE 2: Summary of Minimum Required Air Openings
For Mechanical Room Combustion & Ventilation Air
Model
Two Openings
from within the
Building, Each
having an
opening, in2(cm2)
Two Direct or
Vertical Duct
Openings, Each
having an
opening, in2(cm2)
Two Horizontal
Ducts, Each
having an
opening, in2 (cm2)
Single
Permanent
Opening, in2
(cm2)
INN 600N
600 in2(0.39 m2)
150 in2(0.97 m2)
300 in2(0.19 m2)
200 in2(0.13 m2)
INN 800N
800 in2(0.52 m2)
200 in2(0.13 m2)
400 in2 (0.26 m2)
270 in2(0.17 m2)
INN 1060N
1060 in2(0.68 m2)
265 in2(0.17 m2)
530 in2(0.34 m2)
355 in2(0.23 m2)
INN 1350N
1360 in2(0.87 m2)
340 in2 (0.22 m2)
680 in2(0.44 m2)
455 in2(0.29 m2)
2.4. Combustion Air Pipe Sizing
In computing the pressure loading effect of the combustion piping system, an equivalent straight-
length of piping is used. This equivalent length of piping is the combined sum of all equivalent
lengths of piping and piping components used in construction, including:
1. All straight horizontal and vertical pipe sections.
2. All equivalent lengths of fittings, bends and end terminations.
3. All equivalent lengths associated with extrance or transition effects, for example a
sudden expansion or contraction.
Table 3 provides the required combustion pipe size for the Innovation-Edge water heaters along
with some rule-of-thumb guidelines for estimating the equivalent lengths of common piping
components.
TABLE 3: Rule-of-Thumb Maximum Combustion Air Run Lengths
Model No.
Minimum
Pipe
Diameter
Maximum
Length
Equivalent
Ft. (m)
Equivalent Pipe Lengths
Examples
Sharp 90°
Elbow
Equiv. Ft (m)
45° Elbow
Equiv. Ft (m)
INN 600N, INN 800N,
INN 1060N, INN
1350N
6”
(152 mm)
*140 ft.
(42.7 m)
10 ft.
(3.05 m)
5 ft.
(1.5 m)
* NOTE:
The maximum combined pressure drop of the exhaust and intake-air vents is 140 equivalent-
feet (42.7 m) for 6” (152 mm) pipe (all models). For the INN600N using 4” (102 mm) pipe the
maximum combined pressure drop of exhaust and intake-air vents is 80 (24.4 m) equivalent-
feet. See Section 3.4.

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Rule-of-Thumb Examples –Standard North American units of measure:
1. A 40 foot length of combustion air pipe and 1 sharp 90° elbow plus two termination 90°
elbows add up to 40 ft. + 10 ft. + (2 x 10 ft.) = 70 equivalent ft.
2. A 30 foot (9.1 m) length of combustion air pipe and 2 sharp 90° elbows plus two
termination 90° elbows add up to 30 ft. + (2 x 10 ft.) + (2 x 10 ft.) = 70 equivalent ft.
(21.3 m).
Rule-of-Thumb Examples –Metric units of measure:
1. A 12 m length of combustion air pipe and 1 sharp 90° elbow plus two termination 90°
elbows add up to 12 m + 3 m + (2 x 3 m) = 21 equivalent m
2. A 9 m length of combustion air pipe and 2 sharp 90° elbows plus two termination 90°
elbows add up to 9 m + (2 x 3 m) + (2 x 3 m) = 21 m
For more detailed analysis see sections 3.6 and 3.7 and Example.
2.5. Common Combustion Air Systems
In many installations, the combustion air duct can be manifolded for multiple unit applications.
The length and restriction of the ducted combustion duct directly impact the size, length and
restriction of the discharge venting. The direct vent air intake should be located at least 3 feet (1
m) below any vent termination within 10 feet (3.1 m).
A screen with mesh size not smaller than 1” x 1” (25 mm x 25 mm) must be installed at the inlet
of the ducted combustion air duct.
For systems using manifolded ducted combustion, use the longest length of common duct and
the individual branch to the furthest unit to calculate the pressure drop. Figures 7a and 7b
illustrate preferred and acceptable designs.

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Figure 7a: Individual Vents –PREFERRED Installations
NOTE 1:
For high wind, wind blocked sites, a tee may be installed at the fresh air inlet. The leg of the
tee connects to the combustion air intake. The branches of the tee can be in the horizontal or
vertical direction, as determined by the system designer and site conditions.
NOTE 1A:
Flue terminations should never be stacked. Condensate from the upper can freeze over and
block the lower.

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Individually Sealed Combustion Manifolded Sealed Combustion
Located on Different Wall From Exhaust Located on Different Wall From Exhaust
Manifolded Sealed Combustion Individual Sealed Combustion Manifolded Sealed Combustion
Figure 7b: Individual Vents –ACCEPTABLE Installations
NOTE 2
For high wind, wind blocked sites, a tee may be installed at the fresh air inlet. The leg of the
tee connects to the combustion air intake. The branches of the tee can be in the horizontal or
vertical direction, as determined by the system designer and site conditions.
IMPORTANT NOTES:
1. Please consult the AERCO factory for all applications utilizing common ducted combustion
air with common breeching of exhausts.
2. AERCO boilers and AERCO water heaters may share common combustion air and
exhaust breeching. Other configurations, not depicted in this guide, are possible. If you
intend to implement any of these options, please contact your local AERCO representative
or the AERCO factory for project specific venting and combustion air configurations.
VENT
VENT
AIR
AIR
SEE
NOTE 2
SEE
NOTE 2
AIR
AIR
AIR
VENT
VENT
VENT

Innovation Water Heaters –Edge [i] Controller
Venting and Combustion Air Design Guide
TAG-0090_A •GF-5056 •2/20/2020 Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 18 of 39
3. VENT SYSTEM
The heater vent is fundamental for correct operation. Being a condensing heater, combustion
gases are discharged at a very low temperature. It is therefore necessary for the venting system
to be perfectly impermeable to combustion products condensate and to be made of corrosion
resistant materials. Typical Category IV venting and ducted combustion air illustrations are shown
in Figures 3 through 7. The various funnel joints shall be well sealed and/or equipped with suitable
gaskets, in order to avoid any condensate drain and/or air intake. Ensure that the heater’s vent
section and height conform to national and local regulations (see Section 1.2 APPLICABLE
FEDERAL CODES of this guide).
The exhaust vent system must be pitched back toward the water heater unit by a minimum of 1/4
inch per foot (21 mm/m) of duct length to enable condensate to drain back to the unit for disposal.
Low spots in the vent must be avoided to prevent the condensate from collecting.
The condensate trap assembly is located directly below the exhaust manifold. Plastic hose should
be connected to the trap assembly and run to drain. Care should be taken to avoid hose kinks
and to avoid raising the hose above the trap assembly. Condensate should flow freely to drain.
The condensate-to-drain run must not be hard-piped so the trap can be removed periodically for
maintenance purposes.
If the condensate must be lifted above the trap assembly to a drain, it should be drained into a
sump. From there, a pump can lift the condensate away.
Innovation-Edge units will produce the following maximum condensate quantities in the full
condensing mode:
INNOVATION-EDGE
INN 600N
4.5 gallons per hour
0.28 L/min
INN 800N
6 gallons per hour
0.38 L/min
INN 1060N
8 gallons per hour
0.50 L/min
INN 1350N
11 gallons per hour
0.69 L/min
Condensate drain systems must be sized for full condensing mode.
In multiple water heater applications, it is common to manifold these drains together in a plastic
pipe manifold to a floor drain. Condensate manifolds must be large enough to handle the
anticipated flow and must be properly secured and protected. Manifolds are generally located
behind the units so that short runs of plastic tubing into the manifold can be used for the
condensate drain. A base drain must be installed at the bottom of vertical common flue piping.
The pH level of the condensate produced by AERCO water heaters ranges between 3.0 and 3.2.
The installation should be designed in accordance with local codes that specify acceptable pH
limits. If required, any type of commercially available neutralizer may be used. For water heaters
designed for connection to gas vents or chimneys, vent installations shall be in accordance with
Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1, or Section 7,
Venting Systems and Air Supply for Appliances, of the CAN/CSA B149, Installation Codes, or
applicable provisions of the local building codes.

Innovation Water Heaters –Edge [i] Controller
Venting and Combustion Air Design Guide
TAG-0090_A •GF-5056 •2/20/2020 Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 19 of 39
The vent system for Innovation-Edge heaters 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.

Innovation Water Heaters –Edge [i] Controller
Venting and Combustion Air Design Guide
TAG-0090_A •GF-5056 •2/20/2020 Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 20 of 39
Figure 8: Vent Installation onto Water Heater –Innovation Shown
WARNING
DO NOT INSULATE OR OTHERWISE WRAP VENT PIPE OR FITTINGS.
Sections 3.2 and 3.3, below, discuss specific installation regulations for side-wall and vertical
terminations, respectively.
STRAIGHT VENT STARTER PIPE
MINIMUM 24” (61 cm)
WORM-DRIVE HOSE CLAMP
EXHAUST CONNECTOR
1/4" CAP SCREW [4X] (6.4 mm)
1/4" FLAT WASHER [4X] (6.4 mm)
CLEAN BOTH
SURFACES,
THEN APPLY
HIGH TEMP
SILICON
SEALANT HERE
EXHAUST MANIFOLD