System Design Considerations
VITOCROSSAL 300, CT3
11
System Design Considerations
(continued)
Design notes regarding draining
condensate
The condensate drain to the sewer
connection must be able to be inspected.
Route it with a gradient and equip the pipe
with a P-trap; also provide suitable facilities
for taking samples.
The bottom drain should be located below
the anti-flooding level of the flue gas
collector box.
Condensate drains must only be made from
corrosion resistant materials (e.g. fibre
reinforced hoses).
Never use any galvanised
materials or those containing copper or
black iron for pipes, connectors, etc.
Install a P-trap in the condensate drain to
prevent flue gases from escaping.
Ensure that the domestic drainage systems
are made from materials which are resistant
to acidic condensate such as:
H
Stoneware pipes
H
Hard PVC pipes
H
PVC pipes
H
PE-HD pipes
H
PP pipes
H
ABS/ASA pipes
H
Stainless steel pipes
H
Borosilicate pipes
Combustion air supply
The boiler must not be located in areas or
rooms where chemicals containing chlorine,
bromine, fluorine, or other corrosive
chemicals are stored. Examples include
refrigerants, bleach, paint, paint thinner, hair
spray, cleaning solvents, water softener
salt, etc. The combustion air must not be
contaminated with any amount of the above
mentioned chemicals.
Boiler should never be installed in areas
where excessive dust, high humidity, or risk
of frost exist. Ensure adequate ventilation
and supply of fresh combustion air.
Consult your local Viessmann sales
representative with uncertainties in regard
to a suitable boiler installation location.
This boiler/burner unit needs clean fresh air
for safe operation. Provisions for
combustion and ventilation air must be
made at time of installation. For gas or
propane installations, use the “Natural Gas
Installation Code CAN/CSA-B149.1 or
B149.2” (Canada), or “National Fuel Gas
Code ANSI Z223.1” (USA), and/or
provisions of local codes.
The sizing methods outlined in the
aforementioned codes should be used when
installing a round duct to supply combustion
air from the outside.
Warranty
Our warranty does not cover damages
resulting from the following:
–
Operation with contaminated fill and
supplementary feed water.
–
Operation with contaminated combustion
air.
–
Exposing the boiler to pressures and
tempratures higher than its certified rating.
See warranty sheet for details.
System layout
The boiler water temperature limit is factory
set to 167°F / 75°C.
The boiler water temperature limit can be
increased by altering the adjustable high
limit to increase the supply water
temperature.
To minimize piping losses of the system,
however, Viessmann recommends that the
radiation and domestic hot water production
in the system be designed for a 158°F /
70°C boiler supply water temperature.
Water quality
Treatment for boiler feed water should be
considered in areas with known problems,
such as where a high mineral content and
hardness exist. In areas where freezing
might occur, an antifreeze may be added to
the system water to protect the system.
Please adhere to the specifications given by
the antifreeze manufacturer.
Do not use
automotive silicate-based antifreeze.
Please
observe that an antifreeze/water mixture
may require a backflow preventer within the
automatic water feed and influence
components such as diaphragm expansion
tanks, radiation, etc. A 40% antifreeze
content will provide freeze-up protection to
-10°F / -23°C. Do not exceed 50%
antifreeze mix ratio and do
not
use
antifreeze other than specifically made for
hot water heating systems. System also
may contain components which might be
antifreeze manufacturer.
Oxygen diffusion barrier under
floor tubing
The boiler warranty does not cover pressure
vessel failure resulting from corrosion
caused by the use of underfloor plastic
tubing without an oxygen diffusion barrier.
Such systems without oxygen diffusion
barrier must have the tubing separated from
the boiler with a heat exchanger. Viessmann
always recommends the use of underfloor
plastic tubing with an oxygen diffusion
barrier.
Boiler/Burner start-up
Vitocrossal 300, CT3 boilers with
Weishaupt or Riello burners may require
start-up by Viessmann. Please inquire with
your local Viessmann sales representative to
obtain details regarding the necessary
prerequisites of boiler/burner start-up
procedures.
To minimize delivery lead times, please
ensure that critical technical information is
provided at time of order. Viessmann will
not process an order without site-specific
information regarding available voltage and
gas pressure. In addition Viessmann
recommends that gas pressure information
be provided in writing by the local gas
utility.
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