General Operations; Checking The Flue System Including The Combustion Air Supply, Inlet And Outlet Air Openings; Checking The Heating System Operating Pressure; Measuring The Carbon Dioxide Content - Buderus LOGANO PLUS GB312 Installation Instructions Manual

9.2

General operations

The following operations are not described in any further detail in this
document. They have to be carried out nevertheless:
▶ Checking the general condition of the heating system.
▶ Visual inspection and function check of the heating system.
▶ Checking the air supply and flue pipes for proper functioning and
safety.
▶ Checking all gas and water piping for signs of corrosion.
▶ Replace any corroded pipes.
▶ Checking the charge pressure of the diaphragm expansion vessel.
▶ Check the concentration of possibly used additives in the water
annually.
9.3 Checking the flue system including the combustion
air supply, inlet and outlet air openings
Check the flue system including air supply system and any air inlet/outlet
vents. Immediately rectify any deficiencies identified. Make sure that the
combustion air supply and the air inlet and outlet vents are not blocked
at any point.
9.4

Checking the heating system operating pressure

Establish an operating pressure of at least 15 psi.
▶ Check system pressure.
If the temperature/pressure gauge needle drops below the minimum
pressure marker, the operating pressure is too low. The heating
system must be topped up.
CAUTION: Health risk from contaminated domestic
water.
▶ Observe all regulations and standards applicable in
your country regarding the prevention of drinking
water contamination.
CAUTION: System damage due to frequent topping up.
If you have to top up the heating water frequently, the
heating system may suffer damage from corrosion or
scaling, depending on the water quality (see operator's
log in "Water quality requirements for Logano plus
GB312" manual).
▶ Bleed the heating system while filling.
▶ Check the heating system for leaks.
▶ Check that the expansion vessel functions properly.
Logano plus GB312 – 6 720 647 367 (2012/11)
Heating system inspection
Fig. 53 Pressure/temperature gauge
▶ Replenish with water via the boiler fill & drain valve.
▶ Bleed the boiler by carefully opening the safety valve or an automatic
vent (supplied separately) on the B-kit when the boiler circulation
pump is running.
▶ Bleed the heating system via the purge valves on the heating bodies.
▶ Check the operating pressure again.
▶ Record the amount of water added in the
operator's log.
Read off the operating pressure from the programming
unit (e.g. "P15" means 15 psi).
▶ Refit boiler front panel ( Fig. 5, page 13).
9.5

Measuring the carbon dioxide content

▶ Insert the sensor through the testing hole in the flue pipe into the
centre of the gas flow.
▶ Record the flue gas readings.
If the CO content differs from the specified level by 0,5 %
2
( Sections 7.11 to 7.13, pages 35 to 36), adjust the burner as
described in sections 7.11 to 7.13, pages 35 to 36.
9.6 Determining how dirty the burner and heat exchanger
are and cleaning them
The boiler can be dry or wet-cleaned.
A long and a short blade are available as accessories for dry cleaning.
Cleaning equipment for wet cleaning is also available as an accessory.
Before cleaning the burner or heat exchanger, carry out the following
tasks:
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