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16 COMMISSIONING THE BOILER
First: flushing the boiler with water
After installation of the boiler, before commissioning, the first step is to flush the boiler and the whole heating
installation with fresh water to remove pollution, debris and other material that might cause a blockage. This must
also be done with heating installations, where only the boiler has been replaced.
If a DHW circuit is present, in case of a combi (CO) boiler, the DHW circuit must be cleaned as well.
Existing and new heating systems must be cleaned with a hydronic system cleaner (see additional information in
paragraph 7.17). System cleaner must be drained and thoroughly flushed with clean water to remove any residual
cleaner, prior to installing a new boiler. NEVER leave a system cleaner in the system for longer than recommended
by the cleaner's manufacturer. NEVER put system cleaner inside the boilers heat exchanger.
Second: filling & venting the boiler and the system
After flushing the boiler and the installation, the system can be filled with fresh water. Fill the boiler and the heating
system by using the appropriate filling valve. The water pressure of the system normally lies between 18 and 28
psi (1.2 and 1.9 bar) – see paragraph 7.27.
The boiler has an automatic air vent situated inside the boiler. This vent is always open, and the venting outlet
goes via a plastic tube through the bottom to the outside. Shortly after putting the boiler into operation, check the
water pressure and add or remove some water to obtain the required pressure.
The heat exchanger must be de-aired by means of the manual de-air vent in the boiler (see also paragraph 7.24).
Manual de-airing the heat exchanger
The heat exchanger of the boiler can be manually de-aired by means of the air-vent of the boiler. This air vent is
situated at this top left of the boiler.
To manually de-air the heat exchanger: (see also § 7.24)
•
Use a plastic pvc tube with an inside/outside diameter of 0.27/0.39 inch. Only deairate when the water
and heatexchanger are cold.
•
put a short, fitting drain hose on the air vent;
•
slowly turn the vent open until the air starts flowing out;
NOTICE
(with the air also a small amount of water will stream out; with attached drain hose the drained water can
be easily collected)
•
when all the air is removed, close the air-vent and remove the drain hose.
If a cascade system has been installed, the automatic De-air function must be disabled by means of
parameter 139 - DAir active.
During the commissioning, make sure that no water can enter the boiler and make contact with the electrical parts.
Third: check the water flow
Before starting the boiler ensure that the circulator is operating correctly and that there are no obstructions or
closed valves that could prevent water from flowing through the heat exchanger.
Always ensure the boiler circulator is functioning correctly and that there is flow through
the heat exchanger after working on the boiler or system.
NOTICE
126
Only use your hands when opening and closing this vent NEVER use tools on
this vent.
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
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