32
Installation and operation manual
–
DTHR-V9-2020
Air/Gas relation window :
#
Item
Description
-
General
This section allows a qualified technician to adjust the 20 points air
adjustment curve (air/gas relation) for each gas valve position range.
1
Gas feedback
Use ‘’+ ‘’ or ‘’
-
‘’ to select the gas position where you want to modify the
air ratio.
2
Air command*
Use ‘’+ ‘’ or ‘’
-
‘’ to increase or decrease the air for the
specific gas valve
position.
3
Gas
When the unit is in RUN status, the actual value of the gas valve is
displayed in real time.
4
Fan
When the unit is in RUN status, the actual value of the Fan is displayed
in real time.
5
Graphic
Fan modulation curve for each 0.5 V of gas valve position. The vertical
rectangle shows the position you have selected for modification. If the
unit is running, vertical and horizontal dashed lines intersection will
indicate the actual position of the unit modulation on the curve.
6
Home
Go back to Level 1 menu.
*Important:
Adjust fan slowly by 5% step maximum and wait for combustion stabilisation
before adjusting again. Never go lower than 12% fan command.
Warning
All changes in this adjustment window will affect the combustion. Any modification must be
performed by a qualified technician in respect of the gas codes and with the use of a gas analyser and
instruments for combustion adjustments. Improper adjustment can cause serious injury, death or
property damage.
Level 1: Air/Gas relation
1
2
6
5
3
4
