34
5.5.2 Leak testing
After completion of the installation work, the whole gas line must be tested to a
maximum pressure of
40 mbar (4.0 kPa) for natural gas or 150 mbar (15 kPa) for propane
and checked for leaks using a
commercially available soap solution. The bubbles indicate leaks. All leaks must be eliminated before
the humidifier is put into operation.
Caution! Never use an open flame to check for leaks.
The presence of any leakage is a source
of danger to persons and to property, due to the possibility of fire and explosion.
If the gas circuit must be tested to a pressure of over 150 mbar (15 kPa), the gas supply pipe must be
removed from the unit connection. After the test, the gas line must be depressurized before it is recon
nected to the unit.
Caution!
Non-observance of the above instruction can lead to damage to the gas pressure
regulating valve
. Gas pressure valves overloaded due to high pressure are not covered by the
manufacturer‘s guarantee.
5.5.3 Conversion instructions for operating the humidifier with another type of gas
Ex works the appliance is equipped to operate on one type of gas. To convert an appliance for opera
tion on another type of gas, follow the directions below (see also illustration on the following page).
The conversion shall be carried out by a manufacturer’s authorized representative or
person trained and licenced for such activities, in accordance with the requirements of
the manufacturer or local authorities having jurisdiction in the area of installation.
1. Disconnect the humidifier from the electrical power supply and take precautions against inadvertent
switching on.
2. Turn off gas supply to appliance and secure it against inadvertent open ing.
3. Undo the brackets and open the right side panel(s).
4. Disconnect the hose from the inlet elbow (note the layout). Then, loosen the hose clamp and remove
the inlet elbow.
5. Undo the coupling of the corresponding flexible gas pipe and disconnect gas pipe from the gas
pressure regulating valve.
6. Disconnect electrical cables to the gas pressure regulating valve and the air pressure switch (note
assignment before removal).
7. Undo the two screws that mount the venturi manifold to the combustion air blower, then lift up the
manifold together with the gas pressure re gulat ing valve.
8. Undo the four screws and remove the gas pipe connection of the gas pressure regulating valve.
9. Undo the three screws of the air pressure switch support and remove the pressure switch assembly
from the gas pressure regulating valve.
10. Check the cork gasket and the Oring in the gas pipe connection for damage and replace if neces
sary.
11. Attach the gas pipe connection (with mounted Oring) and the pressure switch assembly to the gas
pressure regulating valve supplied (comes with venturi manifold attached).
Warning!
Make sure the gas type indicated on the label of the venturi manifold corresponds to the
gas you are using.
Do not change the setting of sealed adjustment screw “A”.
12. Fix the new venturi manifold (don’t forget the cork gasket) together with the gas pressure re gulat ing
valve with the two screws to the combustion air blower.
Summary of Contents for GS 120 OC
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