76
5797 340 - 01
Vitoflex 300-RF Installation & Operating
Electrical
Commissioning
Initial start up
Only a Viessmann or another trained specialist may put
a newly installed system into operation for the first time.
Before the system is commissioned, the system must be
filled with water, and the fuel for the commissioning and
the installation itself must be inspected.
Note:
It is mandatory to complete the Viessmann biomass
project pre-commissioning form.
Be absolutely sure to follow the instructions. No warranties
may be claimed for damages in cases of initial start-ups
carried out improperly at one’s own initiative.
First check:
- Is there enough water in the heating system?
- Has the heating system been bled of air?
- Are the valves open for the heating-system’s
supply and return flow?
- Can enough fresh air get into the heating room?
- Is the ash bin empty?
- Are the doors and lids on the boiler closed leak-tight?
- For safety, firing and ashpit doors keep tightly closed.
Filling the heating system
The first filling is usually performed with chemically
untreated filtered water free of any suspended solids.
Ensure that the air is carefully bled out while filling the
boiler. Use appropriate water treatment specific to the
local water conditions.
Note:
The system fill pressure when the system is cold
should be approximately 1.5 psi (0.1 bar) greater
than the supply pressure of the closed expansion tank.
Commissioning and handover
A qualified person from the owner’s side must be present
for the commissioning and handover.
The heat dissipation from the boiler plant has to be assured
by the operating organization or by the heating contractor.
The heating contractor must confirm that the installation
has passed inspection and signed off.
Compliance with these Installation Instructions and the
Operating Instructions will ensure a safe and convenient
heating with wood.
These Installation and Operating Instructions should be
kept near the system on a permanent basis.
CAUTION
Ensure that a Viessmann or another trained specialist
is present for the boiler start-up and that it is done in
a timely manner.
The warranty becomes null and void if this procedure
is not followed.
IMPORTANT
IMPORTANT
Fuel for the commissioning
For the commissioning, sufficient dry fuel (max. W 20%)
should be stored for approx. 10-24 full operating hours:
Vitoflex 300-RF 150
approx. 2640 lb. (1197 kg)
Vitoflex 300-RF 220
approx. 3300 lb. (1497 kg)
Vitoflex 300-RF 300
approx. 4400 lb. (1996 kg)
Vitoflex 300-RF 400
approx. 5500 lb. (2495 kg)
Vitoflex 300-RF 500
approx. 6600 lb. (2994 kg)
Since the boiler plant will be cold, and residual moisture
will be drawn from the refractory concrete during the
initial operation, the material to be burned for the initial
operation has to be at least air dry. For the first three hours,
the heating-up process should be carried out at low output.
To ensure that the silo extraction system is functioning
properly, only place a minimal amount of fuel in the silo
in case there is a problem. This enables the extraction
system to be cleaned out quickly and the problem to be
identified and corrected.
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, it recommended that an antifreeze
be added to the system water for protection against
freezing. 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 back flow 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.
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.
Total output (MBH) Total Hardness (ppm as ca CO
3
)
> 1 Total
[
680
[
200
> 680 to
[
2050
[
150
> 2050
[
2
The pH value of the heating water should be between 8.2
and 9.5
