5 Installation Instructions
24
Rev. 09/2022
5.2
Assembly
Risk of destruction!
The stepper motor of the VariFuel is not suitable for carrying or lifting a gas
mixer. There is a danger that the stepper motor could break, and if the gas
mixer were to fall, it could result in injury or property damage.
Always carry or lift the gas mixer by its exterior housing.
The following steps must always be carried out and are specified in more detail in the following:
–
Install flow body
–
Install VariFuel3 into intake section (air and gas inlet plus mixture outlet)
–
Connect stepper motor driver
For optimum performance according to its design, it is important that air and fuel are mixed in
the VariFuel3 at the same pressure. Therefore, only operate the VariFuel3 gas mixer with a bal-
ance or zero pressure regulator. The balance or zero pressure regulator must be connected to
the impulse line connection of the VariFuel3 and it must be installed in the gas train at a suitable
position before the gas inlet of the VariFuel3.
