Siemens RVW26.000B27 Basic Documentation page 21

Applications with 1 or
2 auxiliary actuators
«AUX1»
Connection of the
auxiliary actuators
Siemens Building Technologies
HVAC Products
With dual-fuel burners, 2 actuating devices (only «AUX1») can be controlled
· either jointly with 1 actuator, or
·
each with 1 actuator
Which of the 2 choices is used depends on the type of burner construction.
The selected mode must be set on the RVW26... (refer to «Programming»).
Version 1
(1 actuator)
The potentiometer's feedback signal is fed
to terminal «B2».
The auxiliary actuator is automatically po-
sitioned according to the «AUX1(1)» or
«AUX1(2)» curve.
B2
Y3
M
Y4
RVW26
Fig. 13 Connection of the auxiliary actuators
Electronic Air / Fuel Ratio Control System
5 Description of functions
(2 actuators)
The potentiometers' feedback signals are
fed to terminals «B2» and «B3».
Both actuators can be switched externally
with an auxiliary contact of the fuel selec-
tor.
The inactive actuator should be driven to
the end switch position «Fully closed».
P
AUX1
RVW26
78731y01/0601
Version 2
B2
Y3 M
P
P
Y4 M
B3
L
Fuel1
Fuel2
CC1P7873.1en
AUX1(1)
AUX1(2)
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15.10.2002