Camus Hydronics DMC 753 Installation, operation and service manual - page 13
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2.2.1
Approved Venting Materials Category IV
1) PVC and CPVC (Chlorinated Polyvinyl Chloride)
Schedule 40 or 80 approved to ULC S636.
2) Manufactured prefabricated UL/ULC listed vent of AL29-
4C or 316L stainless steel. Use of 316L is limited to use in
applications where there is no possibility of contaminants
in the air such as refrigerants, chlorine etc.
3) PVC-DWV approved to comply with ANSI/ASTM D2665
(US Jurisdictions ONLY when permitted).
4) CPVC Schedule 40 approved to comply with
ANSI/ASTM F441. (US Jurisdictions ONLY when
permitted).
Table 7: Maximum Flue Temperature for Various Vent Materials
Vent Material
Maximum Flue Temperature [
o
F]
PVC
149
CPVC
194
AL29-4C
300+, limited only by rating of seals
316L Stainless
Steel
300+, limited only by rating of seals
Air Inlet (Supply Air or Fresh Air) Piping
•
PVC
•
CPVC (Chlorinated Polyvinyl Chloride)
•
ABS (Acrylonitrile-Butadiene-Styrene)
•
Single wall, Galvanized
•
Single wall, Stainless steel
•
Single wall, Aluminium
Single wall air inlet pipes are to be insulated 5 feet from the
wall toward the interior of the building to minimize external
sweating.
The following air intake options shall be utilized:
•
Outside air sealed direct (vertical or horizontal)
•
Outside air ducted to jacket flange
•
Indoor Air
Table 8: Required Vent and Air Inlet Diameters
Equivalent Length of Vent & Air Intake
Pipes at Recommended Diameter
Input
[BTU/hr]
Over 25'
and up to
100'
Over 15'
and up to
25'
Up to 15'
80,000 –
250,000
3"
3"
2"
299,000
4"
3"
3"
399,000
4"
3"
3"
500,000
4"
3"
3"
600,000
5”
4”*
4”*
750,000
5”
4”*
4”*
* Up to 40 equivalent feet
2.3
CATEGORY II VENTING
A category II appliance may be combined into a common
negative pressure venting system designed to ASHRAE
requirements using a proven vent sizing program. Vent
designs are to be certified by a qualified professional
designer acceptable to the authority having jurisdiction.
1)
The DynaMax Floor Mount boiler may be vented as a
Category II appliance using sealed vent suitable for a
condensing appliance.
2.3.1
Approved Venting Materials Category II
1) PVC and CPVC (Chlorinated Polyvinyl Choloride)
Schedule 40 or 80 approved to ULC S636.
2) Manufactured prefabricated UL/ULC listed vent of AL29-
4C or 316L stainless steel. Use of 316L is limited to use
in where there is no possibility of contaminants in the air
such as refrigerants, chlorine etc.
3) PVC-DWV approved to comply with ANSI/ASTM D2665
(US Jurisdictions ONLY when permitted).
4) CPVC Schedule 40 approved to comply with
ANSI/ASTM F441. (US Jurisdictions ONLY when
permitted).
Air Inlet (Supply Air or Fresh Air) Piping
•
PVC
•
CPVC (Chlorinated Polyvinyl Chloride)
•
ABS (Acrylonitrile-Butadiene-Styrene)
•
Single wall, Galvanized
•
Single wall, Stainless steel
•
Single wall, Aluminium
Single wall air inlet pipes are to be insulated 5 feet from the
wall toward the interior of the building to minimize external
sweating.
The following air intake options shall be utilized:
•
Outside air sealed direct (vertical or horizontal)
•
Outside air ducted to jacket flange
•
Indoor Air
2.4
COMBINED COMBUSTION AIR INLET
Both the Category IV Wall Hung and Category II Floor Mount
DynaMax appliances may be installed with a combined
combustion air inlet.
The combined combustion air inlet pipe sizing can be
calculated using the method shown below:
Equivalent pipe diameter = Sq Root [(d
1
)
2
+ (d
2
)
2
+ (d
3
)
2
+ …
+ (d
n
)
2
], where d
n
= individual pipe diameter
•
Example: Find the equivalent pipe diameter of three
air inlet pipes, 3” (7.6cm), 3” (7.6cm) and 4”
(10.2cm)
Equivalent pipe diameter = Sq Root[(3)
2
+ (3)
2
+
(4)
2
] = Sq Root(34) = 5.8”, select 6” (15.3cm)
equivalent diameter pipe.
The air inlet point for multiple boiler air inlets must be
provided with an exterior opening which has a free area
equal to or greater than the total area of all air inlet pipes
connected to the common air inlet. This exterior opening for
combustion air must connect directly to the outdoors. The
total length of the combined air inlet pipe must not exceed a
maximum of 100 equivalent feet (30.5m). Deduct the
restriction in an area provided by any screens, grills or
louvers installed in the common air inlet point. Screens, grills
or louvers installed in the common air inlet can reduce the
free area of the opening from 25 to 75% based on the
materials used. Calculate and compensate accordingly.