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2
Commissioning
2
Commissioning
When a boiler starts up there are a couple of things that
happen. Below is a short process description:
When there is a heat demand:
The fan starts up and the glow ignitor turns on.
When there is a DHW request then the three-way-valve
switches from CH operation to DHW operation.
The pump starts up as soon as the three-way-valve is in the
right position.
Once all the requirements are met (glow ignitor is hot enough,
fan is operating at the correct speed and the pump is on) then
the gas valve will open.
Now a flame may or may not develop, but the glow ignitor
extinguishes. A flame will establish and the glow ignitor
extinguishes. The operating controls are released once a
flame is sensed. After a possible check, the boiler will deliver
the requested output.
Should the flow check fail, the boiler will shut down for a short
while and then try to start up again.
If no flame develops then the gas valve closes and the fan
continues to run to post purge. The boiler will try to start up
three times. If there still is no flame developing after three
times, then the boiler will lock-out.
When the heat demand stops:
The gas valve closes.
The fan will keep going for a short while to post purge the
appliance.
The pump will continue for a while to disperse any remaining
heat energy from the boiler to the heating system.
If there has been a heat request then the three-way-valve will
switch back to the central heating setting.
Follow the steps described in this chapter to properly commis-
sion the boiler and fill out the commissioning log book.
NOTE
If a fault occurs, then refer to the servicing
manual or contact Buderus.
2.1
Preparing the boiler for operation
CAUTION
DO NOT operate the condensing gas boiler if
large amounts of dust are present, e.g. due to
building work in and around the place of instal-
lation.
2.1.1
Fill the heating system
WARNING!
The wall-mounted condensing gas system
boiler must not be activated at this stage.
Buderus • http://www.buderus-domestic.co.uk
30
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
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