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Venting
Model
Category
ADB-751
IV
w/CHX
ADB-1001
IV
w/CHX
ADB-1501
IV
w/CHX
*Contact the manufacturer for details.
**If the boiler is direct vented, a 6 to 8 in. adapter must be installed at the blower inlet.
Vertical Direct Venting System With
Add-on Condensing Heat Exchanger
(Category IV) Installation
These installations utilize the boiler mounted blower to
draw combustion air from outdoors and vent combus-
tion products to the outdoors.
UL 1738 Certified Venting Material (e.g. AL29-4C)
MUST be used. The vent must be installed to prevent
flue gas leakage. Care must be taken during assembly
to ensure that all joints are sealed properly and are air-
tight.
For certain installations, i.e. pool, heat-pump, domes-
tic hot water supply with pre-heat tank, PVC or CPVC
may be used. Contact manufacturer for details.
To prevent the condensation accumulation in the vent,
it is required to install the horizontal portion of vent with
a slight upward slope of not more than 1/4" per foot of
horizontal run and an approved condensate trap must
be installed per applicable codes.
WARNING: For common vent installations, contact
the factory.
WARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
The Stainless Steel non-restricted direct vent cap
must be furnished by the boiler manufacturer in
accordance with its listing.
Certified Venting
Vent Size
Material
(inches)
UL 1738 Certified
Venting Material e.g.
AL29-4C Stainless
Steel PVC*, CPVC*
UL 1738 Certified
Venting Material e.g.
AL29-4C Stainless
Steel PVC*, CPVC*
UL 1738 Certified
Venting Material e.g.
AL29-4C Stainless
Steel PVC*, CPVC*
Table R: Vertical Direct Venting with Add-on
Secondary Condensing Heat Exchanger
Maximum Vent
Length (feet)
35
Subtract 10 ft per
8
elbow, Max. 3
elbows
35
Subtract 10 ft per
10
elbow, Max. 3
elbows
35
Subtract 10 ft per
12
elbow, Max. 3
elbows
Outdoor Installation with Add-On
Condensing Heat Exchanger
Outdoor models are self-venting when installed with
the factory-supplied non-restricted direct vent cap and
require no additional vent piping. This special vent cap
is provided with the boiler in accordance with CSA
requirements. It must be installed directly on the boiler
in a horizontal position. Notching of the vent cap
mounting flange may be necessary to clear outlet pip-
ing on some models.
Care must be taken when locating the outdoor unit
because the flue gases discharged from the vent cap
can condense as they leave the cap. Improper location
can result in damage to adjacent structures or building
finish. For maximum efficiency and safety, the follow-
ing precautions must be observed:
a) Outdoor models must be installed outdoors and
must use the non-restricted direct vent cap sup-
plied by the manufacturer.
b) Periodically check venting system. The boiler's
venting areas must never be obstructed in any
way and minimum clearances must be observed to
prevent restriction of combustion and ventilation
air. Keep area clear and free of combustible and
flammable materials.
c) Do not locate adjacent to any window, door walk-
way, or gravity air intake. The vent should be
located four (4) feet horizontally from such areas.
d) Install above grade level and above normal snow
levels.
39
Combustion Air
Air Inlet
Intake Pipe
Size
Material
(inches)
Galvanized
Steel
6
PVC, ABS
CPVC
Galvanized
Steel
6
PVC, ABS
CPVC
Galvanized
Steel
8**
PVC, ABS
CPVC
Max. Air
Intake Length
(feet)
35
Subtract 10 ft
per elbow,
Max. 3 elbows
35
Subtract 10 ft
per elbow,
Max. 3 elbows
35
Subtract 10 ft
per elbow,
Max. 3 elbows
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