Steps; Fill And Vent The Heating System - Viessmann Vitodens 100-W WB1B Series Installation And Service Instructions Manual

Vitodens 100-W, WB1B Installation & Service

Steps

Start-up
B
CAUTION
Unsuitable fill water increases the level of deposits and
corrosion, and may lead to damage to the equipment.
Thoroughly flush the entire heating system prior to
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filling with water.
Only use fill water of potable quality.
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Soften fill water harder than 150 ppm temporary
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hardness.
Inhibitors or antifreeze additives suitable for heating
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systems may be added manually.
During fill and removal of air, the boiler pump can be
activated. To activate the pump, in less than 2 seconds
turn selector dial to stand-by position 1 from a control
range (counter-clockwise) and then right back into the
control range 2 (clockwise). The pump will run for 30
minutes and cancel the request automatically or after the
ON/OFF switch is turned OFF.
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1. Filling and bleeding heating system
1. Open system isolation valves (if installed).
Note: Before filling the heating system with water, check
2. Check inlet pressure of the diaphragm expansion tank.
Note: If the nitrogen pressure of the precharged expansion
A
3. To remove debris and/or sludge ensure that the
Note: System fill pressure must be approximately 3 psig
Note: Water treatment should be considered in areas
2
To remove air from the heat exchanger:
g
g
g
g
Start-up, Inspection and Maintenance
that all necessary flow check valves are installed.
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 piping is flushed out. Failure to do so may
cause sediment in the boiler causing overheating
and damage not covered by warranty.
higher than the static head when the system is cold.
4. Optional:
Fill the heating system with water at the boiler
filling tap A and drain air completely from the
drain tap B.
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 30% 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.
Connect a hose to the boiler filling tap A and connect
the other end to fresh water supply (or heating medium).
Open the fresh water supply valve 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 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 bleed water, close
the boiler drain valve and open system isolation valves.
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