Checking The Operating Pressure, Topping Up The Boiler Water, And Purging Air From The System; Checking Heating System Operating Pressure; Topping Up The Heating Water And Bleeding; The System - Buderus Logano G234X User Manual

3
Start-up procedure
Flue gas monitoring switch
The boiler is equipped with a flue gas monitor. The flue gas monitor
responds if the flue gas outlet in the boiler is blocked. The flue gas
monitor is mounted directly on the flue gas collector.
If the flue gas outlet in the boiler is blocked:
▶ Do not try to light the boiler.
▶ Inform a qualified service company.
The flue gas path must be searched for blockages. The flue gas monitor
must be reset. Only then can the boiler be started up again.
3.3 Checking the operating pressure, topping up
the boiler water, and purging air from the system
The water used for filling the heating system loses a substantial amount
of volume in the first few days due to the release of its gas content. This
causes air pockets to form and the heating water starts to make noises.
During the first few days after commissioning:
▶ Check the operating pressure daily.
▶ Top up the boiler water as necessary.
▶ Then bleed the boiler and the radiators.
▶ Afterwards, check the operating pressure monthly. Top up the boiler
water as necessary; bleed the boiler and radiators.
After an extended period following commissioning:
▶ Check the operating pressure monthly.
▶ Top up the boiler water as necessary.
▶ Then bleed the boiler and the radiators.
3.3.1

Checking heating system operating pressure

Your heating contractor will have set the system to the required
operating pressure of  15 psi ( 1 bar) and entered the setting in
Tab. 2.
▶ Read the current operating pressure from the temperature/pressure
gauge.
If the operating pressure displayed is lower than the required operating
pressure of  15 psi ( 1 bar):
▶ Top up the boiler water.
Fig. 6 Pressure/temperature gauge
Operating pressure
Design operating pressure
(optimum setting)
Maximum heating system operating pressure
(standard = 30 psi/2 bar)
Table 2 Operating pressure (entered by heating contractor)
6
3.3.2
▶ Have your heating contractor explain the purging and show you
where the boiler fill and drain valve is located.
▶ Connect the hose to the water tap.
▶ Fill the hose with water.
▶ Push water-filled hose onto the hose connector of the boiler fill and
drain valve.
▶ Secure hose with a hose clamp.
▶ Open the fill and drain valve.
▶ Carefully open the water tap and slowly fill the heating system.
Observe the pressure reading on the pressure/temperature gauge
( Fig. 6).
Once the required operating pressure has been achieved:
▶ Close the water valve and the fill & drain valve.
▶ Bleed the heating system via the purge valves at the radiators.
For this, start with the lowest floor of the building.
7 747 010 720-24.2RS
Fig. 7
_______________ psi
▶ Tighten the air purge screw again.
▶ Check the operating pressure again.
_______________ psi
If the operating pressure has dropped as a result of bleeding the system:
▶ Add water to the system.
Once the operating pressure remains stable:
▶ Remove the hose from the drain & fill valve.
Topping up the heating water and bleeding the system
CAUTION: Risk of system damage from the stress cracks!
If you fill the heating system when it is hot, the resulting
temperature stress can cause stress cracks. The boiler
will then leak.
▶ Only top off the heating system when it is below a
supply temperature of 100 °F (38 °C).
NOTICE: Risk of system damage due to frequent topping
off!
Depending on the water quality, the heating system may
be damaged by corrosion or scaling if you frequently top
up the boiler water.
▶ Ask a certified heating contractor if the local water
can be used untreated or whether it needs to be
treated.
If the boiler water must be treated:
▶ Have a certified heating contractor top up the heating
system.
If the boiler water must be topped up frequently:
▶ Notify a certified heating contractor.
Bleeding a radiator
Logano G234X – 6 720 811 235 (2014/05)