E93.1001EN.C Manual CD
+
102
C
HECKING AND ADJUSTING AT MAXIMUM LOAD
CD+120
/
CD+150
/
CD+180
The water heaters CD+120, CD+150 and CD+180 all have double gas valves, see the drawings on page 99
First connect a manometer to "p-out" = measuring point [4] of the
left
gas valve (see drawing).
•
Now, turn setting screws [2] of both gas valves clockwise until you feel resistance. This means that the
valves are closed, do not try to tighten the screws any further in the closed position.
•
After this, turn screws [2] of both left and right hand gas valve counter clockwise (open), according to the
number of turns in table 2 or 3 for the used water heater and gas type.
From now on
only
use the
right hand
gas valve for adjustments on high fire.
Adjust the right valve at maximum load by carrying out procedure 1 on page 103.
If the burner doesn’t start up in service mode, turn screw [2] a quarter turn counter clockwise further open, and try
again.
C
HECKING AND ADJUSTING AT MINIMUM LOAD
CD+120
/
CD+150
/
CD+180
Adjusting these water heaters at minimum load in case B involves extra measurements, to get both valves bal-
anced:
Use the [▼] button to decrease the actual load of the service (percentage) to the minimum. The following screen
will appear:
Display message
H E A T I N G : S e r v i c e
2 6 %
> > >
1 2 3 . 4 ° C ( 1 2 3 . 4 ° C )
Water heater is activated and operates at service mode at 26% (minimum).
See table 4 for pressure settings "p-out" gas valve for the used water heater and gas type.
Use screw [1] on the
left hand
gas valve to adjust the measured pressure at "p-out" to the right value according
to table 4. Be sure the manometer has been zeroed out prior to making this setting.
Below, the influence of turning screw [1] is described.
Turning counter clockwise
Turning clockwise
→
→
less gas
more gas
→
→
a drop in
CO
2
a rise in CO
2
→
→
a drop in measured pressure at "p-out"
a rise in measured pressure at "p-out"
After "p-out" has been set according table 4, the CO
2
level at low fire has to be set again. Use values of table 1
and/or figures.
Adjust screw [1] of the
RIGHT hand
valve to set the CO
2
at minimum load by carrying out procedure 2 on page
103.
Again, toggle between high fire and low fire to make fine-tuning adjustments (adjusting the minimum setting affects
the maximum setting and contrariwise).
If the valves have been set correctly, "p-out" left should equal "p-out" right. As an additional test, one could check
this by measuring "p-out" at the RIGHT valve, i.e. at measuring point 4 on the right valve (not denoted in the
drawings on page 99).
This pressure should be in the same range of pressure as the left valve, so in accordance with table 4 again.
If, after all setting steps have been carried out properly, the values of left and right "p-out" are still very different,
contact your supplier.
