S-CB
+
Boiler Range Manual
99
14.3.4
C
HECKING AND ADJUSTING AT MAXIMUM LOAD
S-CB
+
120
/
S-CB
+
150
/
S-CB
+
180
The boilers S-CB
+
120, S-CB
+
150 and S-CB
+
180 all have double gas valves, see the drawings on page 94.
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 boiler 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 100.
If the burner doesn’t start up in service mode, turn screw [2] a quarter turn counter clockwise further open, and try
again.
14.3.5
C
HECKING AND ADJUSTING AT MINIMUM LOAD
S-CB
+
120
/
S-CB
+
150
/
S-CB
+
180
Adjusting these boilers at minimum load in case B involves extra measurements, to get both valves balanced:
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 )
Boiler is activated and operates at service mode at 26% (minimum).
See table 4 for pressure settings "p-out" gas valve for the used boiler 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 cf. table 4, use only the
right hand
screw [1] for setting the CO
2
at low fire.
Adjust the
right hand
valve at minimum load by carrying out procedure 2 on page 100.
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 draw-
ings on page 95).
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.
Summary of Contents for S-CB+ Series
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