Steps; S I M 1. Fill And Vent The Heating System - Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual

Steps

Start-up
Fig. 46
CAUTION
Unsuitable fill water increases the
level of deposits and corrosion,
and may lead to damage to the
equipment.
Thoroughly flush the entire
I
heating system prior to filling
with water.
Only use fill water of potable
I
quality.
The water will have to be
I
softened if it is harder than
8.77 grains / 150 ppm total
dissolved solids.
Inhibitors or antifreeze additives
I
suitable for heating systems may
be added manually.
Initial Start-up, Inspection and Maintenance
1. Fill and vent heating system
1. Open system isolation valves (if
installed).
2. Check inlet pressure of the
diaphragm expansion tank.
3. To remove debris and/or sludge
ensure that the system piping
is flushed out. Failure to do so
may cause sediment in the boiler
causing overheating and damage
not covered by warranty.
4. Optional:
Fill the heating system with water
at the boiler filling tap A and
drain air completely from the drain
tap B.
To remove air from the heat exchanger
Connect a hose to the boiler
g
filling tap A and connect the
other end to fresh water supply
(or heating medium).
Open the fresh water supply valve
g
and then open the boiler filling tap
A slowly to fill the boiler with
water. Isolation valves (not shown)
to isolate system components
must be closed during fill/bleed
process.
Flush the boiler heat exchanger
g
via the boiler supply and return (for
at least 10 mins.) until all air has
been removed from the boiler.
When the drain tap B begins to
g
bleed water, close the boiler drain
valve and open system isolation
valves.
Continued on following page.
Note:
Before filling the heating system
with water, check that all necessary
flow check valves are installed.
If the nitrogen pressure of the
precharged expansion tank is
less than the static pressure of the
system, inflate membrane pressure
to slightly exceed pressure of
system. The static pressure
required at the tank is based upon
the static height of the system.
The system fill pressure value must
be equal to the expansion tank
pressure value at approx. 60º F /
15.6º C.
System fill pressure must be
approximately 3 psig higher than
the static head when the system
is cold.
Water treatment should be
considered in areas where it is
known that boiler feed water
contains a high mineral content
and hardness.
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 use antifreeze other than
specifically made for hot water
heating systems. System also
may contain components
which might be negatively affected
by antifreeze. Check total system
frequently when filled with
antifreeze.
45