Alke Global-10-T Instructions d'installation, de service et d'utilisation - Page 7

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Gas cylinder supply
The gas can also be supplied from LPG gas cylinders. The minimum size is a 11-kg cylinder or larger.
Before buying a cylinder make sure that the connections of the gas regulator and the gas valve of the
cylinder are of the same type. Check with your gas supplier for the correct size of gas regulator. Check
the technical table for the maximum gas consumption and gas pressure.
Store the gas cylinders always on ground level in a well-ventilated place, preferably outside the room
where the heater is. In case the gas cylinder is placed in a cylinder housing, or cover, make sure that
there is enough ventilation as requested by the applicable regulations or standards. Never obstruct these
ventilation holes. Make sure that the gas cylinders are used in upright position only and are secured
again tipping over during use. Gas cylinders laying on their side will give liquid gas. This is very
dangerous and will give a fire ball when it reaches the heaters.
In case the gas cylinder is placed in the same room as the heater is, keep it at a safe distance from the
heater so it will not be over heated. Advisable is at least 2 meters. Make sure that the gas cylinder valve
can easily be reached to close the gas supply in an emergency. Pay special attention how to change
the gas cylinders in a safe way.
For the Global-5 a minimum of 1,5 gas cylinder (11 kg or larger) per heater is needed. For the Global-
10 a minimum of 2 gas cylinders (11 kg or larger) per heater are needed for a guaranteed gas supply.
For a 45-kg gas cylinder a maximum of two Global-5 heaters is recommended. Having more heaters on
the gas cylinders as recommended above will give gas capacity problems, especially when it becomes
colder, due to limited vaporisation of the gas.
Biogas
While biogas can be corrosive under certain conditions it is important that the biogas is clean before
entrance to the appliances. The gas shall be dry and free from dust, oily and greasy particles to avoid
internal blockage of the appliances. Also, halogens, chlorides, H2S and NH3 shall be removed to avoid
corrosion. The tolerance on biogas composition with CH4=60% is +/- 4% CH4.
Gas hose
In most installations, the heaters are not connected directly to the gas system but a gas hose is used.
Keep the hoses always as short as possible, especially for natural gas and low-pressure LPG. For high-
pressure LPG, the maximum length (concerning capacity issues) is 5 meters.
The gas hoses must be inspected frequently and must be changed within the prescribed intervals. Check
the hose at least every 6 weeks. Avoid twisting or stress of the gas hose. Twisting or stress will shorten
the live time of the gas hose. During inspection, check the hose for damage, splitting, ageing and
cracking. Pay special attention to the connections. If a defect is seen directly change the gas hose by a
new one of the same type. Keep the hoses clean from dirt, moisture and dust.
Some countries have regulations that gas hoses must be replaced every 2 or 3 years. Please check with
your gas supplier. Always use official approved gas hoses, suitable for the pressure concerning. Replace
a gas hose always by a type of the same length, internal diameter and equivalent quality. For safety
reasons: never use air hoses or water hoses, these are very dangerous for gas transportation and
will leak soon!
Version: Sept 2017
7
manual number: 0009 0440EN