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7.3
Gas
Valve
Adjustment
Connect the flue gas analyser to the sampling point which is located
on
the turret
of
the air/flue system
Operate the boiler at maximum load (see section 7.4 Service Mode).
Be sure that boiler is running at maximum load
(---+
maximum fan speed).
Wait approximately 4 minutes for the stabilisation
of
the values.
Check the
C02
value against the Setting Values Table below
If the
C02
value is not
in
the range (±0.2), gas valve adjustment
is
necessary.
Turn the flow adjustment screw (see figure below) with 2.5 mm allen key counter-
clockwise (in direction +ve) to increase or clockwise (in direction -ve) to decrease
gas flow
(C02
value) to the burner.
Adjust the required
C02
value (±0.1) according to the setting values table.
Wait for the stabilization
of
the values
Operate the boiler at minimum load (see section 7.4, Service Mode).
Be sure that boiler is running at minimum load (---+minimum fan speed).
Wait approximately 4 minutes for the stabilization
of
the values.
Check the
C02
value against the Setting Values Table below
If the
C02
value is not
in
the range (±0.2) gas valve adjustment is necessary.
Turn the offset adjustment screw with 2.5 mm allen key clockwise (in direction
+ve) to increase or counter-clockwise (in direction -ve) to decrease minimum
C02
value.
Wait for the stabilization
of
the values.
Recheck the values at maximum load and minimum load because each
adjustment changes the previous setting value (See the flow adjustment and
offset adjustment graphs below.
Setting Values
Boiler Model
Natural Gas Propane
Fan Speed (rpm)
C02
(%)
02(%)
Fan Speed (rpm)
C02
(%)
Morco24CPM
1620 8,7 (±0,1) 5,6 (±0,2) 1860
10,0
(±0,1)
4680
9,3 (±0,1) 4,5 (±0,2)
4440
10,8
(±0,1)
Morco 30CPM
1620 8,5 (±0,1)
6,1
(±0,2) 1860
9,7
(±0,1)
4800
9,0 (±0,1)
5,1
(±0,2)
4440
10,8
(±0,1)
32
02(%)
5,7 (±0,2)
4,4 (±0,2)
6,2 (±0,2)
4,4 (±0,2)
32


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