System Filling - Vesta VRC-100 Installation Manual

Filling the Condensate Trap
Before operating the boiler, fll the condensate trap with water
through the flue connector. The boiler may be severely damaged
unless filled with water prior to operation. Pour more than 0.1 gallon
(400 ml) of water into the exhaust duct. Defate air sufficiently or
equip the air vent with an outlet pipe prior to flling the condensate
trap with water (there must be no air inside the heat exchanger).

System Filling

Built-in water filling
VESTA DS VRC boiler is designed to fill the system with water.
Therefore, additional water fill connection is not necessary in most
cases. Filling the system with water should be carried out after all
space heating pipes and DHW pipes are connected.
The procedure is as follows.
•
When you turn the makeup water feeding valve shown in the
figure below counterclockwise, the space heating system will be
filed with water.
•
When filling with water after installing it for the first time, it may
operate and stop repeatedly due to the presence of air. Allow
sufficient time to remove air from the pipes completely.
•
After filling with water completely and removing air completely,
close the makeup water feeding valve by turning it clockwise.
•
Fill the system with water to a level at which the pressure inside
the system does not exceed 30psi.
External Water Fill Connection
External water fill connection may be installed on the system piping
if it is required for specific applications. See the following figure for
an example of external water fill installation on the system piping.
Circulator
Air Separator
Make-up water
Expansion Tank
To system
Installing the System Piping
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