General Information
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Product Information
Sectional gray cast-iron boiler with triple-pass design.
For operation in closed loop, forced circulation hot water heating systems. This
boiler does not require a flow switch.
The boiler model size selected should be based on an accurate heat loss calculation
of the building. The boiler selected must be compatible with the connected
radiation.
Maximum adjustable high limit setting (Aquastat):
240°F / 110°C
. . . . . . . . . . . . . . . . . . . . . . .
Maximum allowable working pressure
*1
:
45 psig / 3 bar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel:
#2 fuel oil
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*1
Cast iron sections are ASME stamped for 58 psig / 4 bar and maximum allowable
temperature of 250°F / 121°C.
Supply/return bypass for large water content systems
For boilers connected to large water content systems (typically systems with
volume > 1 USG / 3.8 ltr for every 13000 Btu/h of boiler input), such as a previous
gravity system with large free-standing radiators, a bypass line from the supply pipe
to the return pipe must be used to avoid flue gas condensation in the heat
exchanger and the vent system. A bypass can be installed on any system as a
preventative measure.
Viessmann strongly recommends installing a bypass pipe on
all cast iron boilers.
IMPORTANT
This boiler is equipped with an outdoor reset module that saves energy by reducing
the boiler water temperature as the heating load decreases. This feature is equipped
with an override which is provided primarily to permit the use of an external energy
management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE
FOLLOWING CONDITIONS IS TRUE:
- an external energy management system is installed that reduces the boiler water
temperature as the heating load decreases.
- This boiler is not used for any space heating.
- This boiler is part of a modular or multiple boiler system having a total input of
300,000 BTU/hr or greater.
- This boiler is equipped with a tankless coil.
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