Setting The Injector Pressure; Setting The 20/25-Mbar Version - DeDietrich DTG 320 Eco.NOx Series Manual

3 Setting the injector pressure

Turn the boiler on.
See: Boiler installation and maintenance instructions
Final checks before commissioning
Commissioning procedure
The pressure must be set by a qualified professional.

Setting the 20/25-mbar version

1. Setting the pressure - 2nd stage
- Connect a manometer to the pressure socket located on the
manifold.
- Run the boiler at 2nd stage, activating the thermostat(s).
- Free the cylindrical split head screw C by around one turn.
- Fully unscrew the setting button D (anti-clockwise).
- Tighten the inhibitor screw C.
- Set the pressure at the injectors by turning the screw on the
regulator B.
By turning to the right, the flow rate increases.
By turning to the left, the flow rate is reduced.
If you find you cannot tighten screw B any further before
reaching the desired pressure, unscrew B again by a quarter
turn and continue the setting by turning D after freeing the
inhibitor screw C.
01/10/07 - 94858180 - 8358-4140fF Adapting to another gas - DTG 320 Eco.NOx - DTG 330 Eco.NOx
2. Setting the pressure - 1st stage
- Run the boiler at 1st stage by activating the burner on selector
switch on the boiler control panel.
- Set the flow in such a way as to obtain pressure at the injectors (0.5
x Pressure - Stage2)
6 Pressure settings and calibrated injector markings (page: 6)
- Set the 1st stage flow with the ring E.
By turning the the right, the flow rate is reduced.
By turning to the left, the flow rate increases.
- Tighten the inhibitor screw C
3. Setting the start-up progressivity (or initial flow)
G : Protective hood
In the factory, the progressivity is set to minimum (low start-up
pressure).
Depending on the installation conditions, adjust the progressivity
setting in order to guarantee optimum boiler start-up.
- Unscrew the protection cap.
Use like a spanner to turn the setting rod H until you obtain the
desired initial flow.
Set the 1st stage flow with the ring E.
By turning the the right, the flow rate is reduced.
By turning to the left, the flow rate increases.
- Put the cap back in place.
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