M3
CONDENSING WATER BOILER
20
34-1115 12/15
8 VENTING
All M3 models use the positive pressure generated by the burner system blower to push combustion products out of
the vent. Since the vent system is under positive pressure and must be capable of containing condensate, it must be
constructed using schedule 40 solid PVC or CPVC pipe or using a Polypropylene or Stainless Steel venting system
(single or double wall) listed by ETL, UL, ULC or CSA for Category IV positive pressure gas appliance venting. Do
not use ABS pipe and do not use PVC or CPVC pipe with cell/foam type construction (such as “CellCore”) or other
non-solid PVC or CPVC plastic pipe.
Chaudières M3 sont conçus pour fonctionner avec le PVC, CPVC ou en polypropylène ou simple ou double paroi en
acier inoxydable système indiqué par ETL, UL, ULC ou CSA pour la catégorie IV pression positive appareil à gaz
évacuation de ventilation. Ne sélectionnez pas la taille du tuyau de ventilation basée uniquement sur le diamètre
raccord de l'appareil.
WARNING: Use only solid PVC or CPVC pipe or use a Polypropylene or Stainless Steel venting (single or
double wall) system listed by a nationally recognized testing laboratory for Category IV positive pressure
gas appliance venting. Use of ABS pipe, or use of PVC or CPVC pipe with cell/foam type construction or use
of use of venting materials other than specified in these instructions can result in failure of the venting
system and/or exposure to carbon monoxide or other toxic fumes, which can result in property damage,
personal injury or death.
8.1 Vent Material Selection
Condensing boilers like the M3 utilize colder building return water to increase boiler efficiency and lower flue gas
temperatures. Higher building return water temperatures result in higher flue gas temperatures, requiring higher
temperature rated venting system materials. For proper operation, the vent system material selected and installed
must be adequate for the maximum building return water temperature. Once the vent material has been selected,
follow all of the requirements in Section 8.2 Vent Installation – General and all of the requirements for the selected
vent material located in either Section 8.3 PVC Vent Installation or Section 8.4 CPVC Vent installation or Section 8.5
Polypropylene or Stainless Steel Vent Installation.
VENTING MATERIAL SELECTION BASED ON
BUILDING RETURN WATER TEMPERATURE
Vent System Material
Specified**
Maximum Return Water Temperature
(Maximum allowed by boiler Vent Safety Switch)
Other Allowed Vent
System Materials**
PVC Up to and including 100ºF (37ºC)
CPVC, Polypropylene*
or Stainless Steel*
CPVC or
Polypropylene* Up to and including 140ºF (60ºC)
CPVC, Polypropylene*
or Stainless Steel*
Stainless Steel* Return temperatures greater than 140ºF (60ºC) Stainless Steel*
* Polypropylene and Stainless Steel venting systems must be ETL, UL, ULC or CSA listed as Category IV
** The Vent Safety Switch is set to protect the vent system material specified when ordering the boiler. Higher temperature rated vent
materials can be used, but the maximum allowed return water temperature for the vent material specified is unchanged, unless the
Vent Safety Switch is revised and new markings are applied by a factory authorized service agency.
NOTE: The M3 boiler ships with a Vent Safety Switch that will keep the boiler from operating with a flue gas
temperature that exceeds the maximum allowable temperature of the vent material originally specified for use with
the boiler.
If the boiler is installed with a vent material suitable for operation with flue gas temperatures that exceed the original
vent material specified and if a higher maximum boiler return water temperature is needed, the vent safety switch
must be changed by a factory authorized service agency to allow the boiler to operate with the higher flue gas
temperatures resulting from the higher maximum boiler return water temperature. Markings will also be affixed to the
boiler stating that vent materials with lower temperature ratings must not be used.
To Next Page
Loading...
