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Siemens Building Technologies Electronic Air / Fuel Ratio Control System CC1P7873.1en
HVAC Products 15 Programming the RVW26... 15.10.2002
Operating mode
0 Load = 0. 0
0 Aux1Pos = 0. 67
1 Aux2Pos = 0. 53
Parameter Meaning
Load
Current burner output in %
Aux1Pos
Position of auxiliary actuator «AUX1»
Aux2Pos
Position of auxiliary actuator «AUX2»
Note:
Deviations of the «Load» value from the RVW25... over a longer period of time is an
indication of a fault of the digital info channel.
Configuring the system
1Aux1Act : 1
9Aux2Act : on
1Aux1Tim: 30
Aux2Ti m : 30
Parameter Meaning
Aux1Act
Number of auxiliary actuators at the first extension channel (refer to chapter «Se-
lection of fuel»)
Setting range: 1 / 2
Factory setting: 1
Aux2Act
Auxiliary actuator at the second extension channel yes / no
If «Aux2Act» has been set to «off», no more «Aux2» parameters will appear on
the other programming levels
Setting range: on / off
Factory setting: off
Aux1Tim
Running time of auxiliary actuator 1 ¹)
Setting range: 30...60 s
Increment: 5 s
Factory setting: 30 s
Aux2Tim
Running time of auxiliary actuator 2 ¹)
Setting range: 30...60s
Increment: 5 s
Factory setting: 30 s
¹)
The running time to be set is the period of time the actuator would require to move the poten-
tiometer from 0 V to 10 V. This means that the running time is defined by the speed of the
actuator and the electrical angle of the potentiometer. The running time is always to be
rounded up to the next higher practical value. The actuator running times of «Aux1 / Aux2»
may differ.
Example 1: actuator: SQM54.482A2 running time: 30 s / 90°
potentiometer: ASZ12.803 R / °: 1000
W
/ 90°
Running time to be set =
90° x 30 s
90°
= 30 s
Example 2: actuator: SQM54.482A2 running time: 30 s / 90°
potentiometer: ASZ12.833 R / °: 1000
W
/ 135°
Running time to be set =
135° x 30 s
90°
= 45 s
Programming level 0
Display
Interpretation
Programming level 1
Display
Interpretation
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