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17
COMMISSIONING THE BOILER
First: flushing the boiler with water
After installation of the boiler the first step, before commissioning, is to flush the boiler and the whole heating
installation with fresh water to remove pollution, debris and other materials that might cause a blocking. This must
also be done with heating installations, where only the boiler is replaced.
Existing and new heating systems must be cleaned with a hydronic system cleaner; see additional information in
§ 7.12. 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 for longer than recommended by the manufacturer
of the cleaner. 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 22 and 50
psi (1.5 and 3.4 bar) – see § 7.20 "Water pressure".
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.
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 the circulator is installed and operating correctly and that there are no obstructions
or closed valves that could prevent water flow through the heat exchanger.
Always ensure the boiler circulator is functioning correctly and that there is flow through the heat
NOTICE
Mounting Condensate Trap
When mounting the bottom part of the condensate trap, before commissioning the boiler and/or after maintenance,
it must ALWAYS be completely filled with water.
This is a safety measure: the water in the condensate trap keeps the flue gases
from leaking out of the heat exchanger via the condensate drain.
WARNING
Picture 17. 1
When the boiler receives a heat demand the electronics will start the operation of the boiler. Before the boiler is
used, the boiler must be adjusted and set at the minimum and maximum load.
exchanger after working on the boiler or system.
The condensate trap must always
be filled to the edge with water,
before replacing it to the boiler.
E93.1601EN032.C VGH installation manual
99
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