Providing The Fuel Supply; Installing Gas Feed - Buderus Logano plus GB312 Installation And Service Instructions Manual

CAUTION: Risk of system damage from excessively high
temperatures!
If you fill the heating system when it is hot, the resulting
thermal stresses can cause stress cracks. The boiler will
then leak.
▶ Fill the heating system only when it is cold (the
supply temperature should be no more than 104 °F).
▶ When the heating system is in operation, do not fill it
via the boiler fill and drain valve. Instead, use the
filler valve in the heating system pipework (return).
▶ Pay attention to the water quality as specified in the
"7747010721_GB312_Water Quality
Requirements.pdf" and record the volume and
quality of the water used to fill the system.
▶ Open the mixing and shut-off valves on the heating water (primary)
side.
CAUTION: Risk of system damage due to unsuitable
boiler water.
▶ Pay attention to the quality of the water used to fill
the heating system. Poor water quality can damage
heating systems due to scale formation and
corrosion. For further details, please see the
accompanying "7747010721_GB312_Water
Quality Requirements.pdf".
Maximum operating pressure
[psi]
50 with the pressure relief
valve supplied
Table 12 Operating pressure and test pressure
CAUTION: Health risk from contaminated drinking
water!
▶ Observe all country-specific regulations and
standards regarding the prevention of drinking water
contamination.
▶ Connect the hose to the water tap. Push hose onto the hose
connection of the boiler fill and drain valve, fasten with a hose clip,
and fill with water.
▶ Open the fill and drain valve.
Slowly fill the heating system. Observe the pressure gauge
(pressure/temperature gauge) while doing so.
▶ Close the water tap and the boiler fill and drain valve once the
required operating pressure has been reached.
▶ Check the connections and pipework for leaks.
▶ Bleed the boiler by carefully opening the safety valve or an automatic
vent (accessory) on the B-kit when the boiler circulation pump is
running.
▶ Bleed the heating system via the purge valves.
▶ Top with water if the pressure drops as a result of bleeding the
system.
Logano plus GB312 – 6 720 806 273 (2013/01)
Maximum testing pressure
[psi]
75
▶ Remove the hose from the drain & fill valve.
1
Fig. 29 Drain & fill valve on the return
[1] Fill and drain valve
6.11

Providing the fuel supply

DANGER: Risk to life from explosion of flammable
gases!
▶ Work on gas components may only be carried out by
qualified and authorized personnel.

6.11.1 Installing gas feed

For details of the required gas pipe diameter, refer to Table 13 and
Table 14 on page 28. Make absolutely sure that the pipe fittings have the
correct thread size.
▶ Make sure that a sediment trap is installed at the inlet where the gas
supply pipe connects to the boiler.
Install and seal the gas shutoff valve supplied at the
boiler's gas connection.
▶ Securely fasten gas supply lines outside the boiler.
Observe the local regulations or else the requirements the National Fuel
Gas Code, ANSI Z 223.1 or CAN/CSA B149.1 in Canada, when
connecting the gas supply.
Where required by local regulations, the heating system must comply
with the American Code for Controls and Safety Devices for
Automatically Fired Boilers (ASME CSD-1). Accessories to comply with
ASME CSD-1 are available (please see page 84 and 65 in parts list).
DANGER: Risk of explosion from leaking gas lines and
gas connections!
▶ Use soap solution to carry out a proper leak test.
6
Installing the boiler
7 747 010 720-25.1RS
27