Buderus G234X/38, Installation And Service Instructions Manual

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5
Boiler installation
Logano G234X – 6 720 811 233 (2017/02) 13
Leak test
▶ Test the boiler and gas supply connections for leaks (

page 18).
Pressure tests
Disconnect the boiler with the attached manual shutoff valve and
physically separate the boiler from the gas supply piping if the gas supply
piping system is pressure-tested with a test pressure greater than
0.5 psi (34.5 mbar).
If the gas supply piping system is pressure-tested at a test pressure of
0.5 psi (34.5 mbar) or less, it is sufficient to disconnect the boiler from
the gas supply piping system by closing the shutoff valve.
5.4.2 Converting boiler to propane
The boiler is factory-set for operation with natural gas.
5.5 Filling heating system and checking for leaks
The boiler is tested for leaks at the factory. Before putting the heating
system into operation, it must be checked to ensure that no leaks will
occur during operation.
▶ Seal off connection for safety valve in the heating supply and all other
unused connections with plugs.
▶ Isolate the expansion tank from the system by closing the cap valve.
▶ Open the mixing and shutoff valves on the heating water (primary)
side.
DANGER: Risk of explosion!
Leakage from the gas pipes and gas connections may
cause an explosion.
▶ Carry out a proper leakage test using leak detector
fluid.
NOTICE: Risk of system damage due to short-circuits!
▶ Cover the areas at risk before carrying out the
leakage test.
▶ Do not spray leak detector onto cable conduits, plugs
or electrical connecting leads or allow it to drip onto
them.
Use only sealing compound that is resistant to corrosion
by LPG for the pipe connections. The sealing compound
must be applied sparingly to the male thread of the pipe
connections.
Conversion kits for converting the boiler from natural gas
to propane gas can be obtained from Bosch.
Do not attempt to convert the appliance without the
approved Buderus parts and the relevant technical
documentation. The technical documentation is
included with the conversion parts.
For information about the identification of the main gas
orifice and the nominal gas orifice pressure for natural
gas and propane gas, see Section 2.8.3, page 7.
WARNING: Risk of system damage due to excess
pressure when testing for leaks!
Pressure, control and safety equipment may be
damaged by excessive pressure.
▶ When you carry out a leak test, make sure that no
pressure, control or safety device that cannot be
isolated from the boiler's water chamber is installed.
WARNING: Health risk from contaminated domestic
water!
▶ Always observe the regulations and standards
applicable in your jurisdiction for the prevention of
contamination of drinking water (e. g. by water from
heating systems).
NOTICE: Risk of damage to system due to temperature
stress!
If you fill the heating system when it is hot, the resulting
temperature stress can cause stress cracks. The boiler
will then leak.
▶ Only fill the heating system when it is in a cold state.
Maximum permissible supply temperature 100 °F
(38 °C).
Water treatment
▶ Have the water analyzed before filling the heating
system.
▶ Compare the results of this analysis with the
technical documentation on water quality for boiler
water.
▶ Please consult the local water supply company if
there are major differences, such as extremely hard
water or a pH value < 7.0.
Carry out the leak test at 1.5 times the normal operating
pressure (

Tab. 9) and in accordance with the local
regulations.
Maximum
operating pressure Maximum
test pressure
30 psi (2.1 bar)
with the included safety valve 45 psi (3.1 bar)
58 psi (4 bar)
with a different safety valve 75 psi (5.2 bar)
Table 9 Test pressures