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Siemens Building Technologies Electronic Air / Fuel Ratio Control System CC1P7873.1en
HVAC Products 9 Assignment of terminals and description of inputs / outputs (I / O) 15.10.2002
9.2 Description of the inputs / outputs
Terminal Input / output Voltage Description
B2 I DC 0...10 V Potentiometer (wiper ) from auxiliary actuator (AUX1(1))
B3 I DC 0...10 V Potentiometer (wiper) from auxiliary actuator (AUX1(2))
B4 I DC 0...10 V Potentiometer (wiper) from auxiliary actuator (AUX2)
F1 I AC 230 V Fuel selection: Fel 1
F2 I AC 230 V Fuel selection: Fuel 2
L I AC 230 V Live for internal power supply, actuator outputs and «Q1»
N I Neutral conductor for internal power supply, reference potential for the mains
voltage inputs (all N-terminal are internally interconnected)
M Reference potential for all low voltage inputs / outputs and for the screening
(all M-terminals are internally interconnected)
Q1 O AC 230 V Acknowledge signal: Indicates to the burner control when certain actuator posi-
tions are reached
Q2 I AC 230 V Signal from burner control: First fuel valve on / off
Q3 I AC 230 V Signal from burner control: Fan on / off
Q4 – Q5 / H O potential free Readiness contact / control loop: Indicates operational readiness of the
RVW26...
TxD O Interface for the RVW25.000B27
RxD I Interface for the RVW25.000B27
GND Reference potential for the interface
U1 I DC 0...10 V Signal input for analog burner output control
U3 I DC 0...10 V Signal input for predefined speed from the RVW25...
U10 O DC 10 V Power supply for potentiometers (all «U10» terminals are internally intercon-
nected)
X1 O DC 0...10 V Burner load signal
X2 I DC 0...10 V Correcting variable signal from O2 trim control of the RPO25...
X3 O DC 0...10 V Predefined speed for the variable speed drive
Y3 O AC 230 V Positioning signal (open) for actuator «AUX1»
Y4 O AC 230 V Positioning signal (close) for actuator «AUX1»
Y5 O AC 230 V Positioning signal (open) for actuator «AUX2»
Y6 O AC 230 V Positioning signal (close) for actuator «AUX2»
Y8 O AC 230 V Positioning signal for the RVW25..: valve «ON / OFF»
Y10 I AC 230 V Signal for prepurging from the burner control
Y20 I AC 230 V Signal for ignition position and «CLOSE» position from the burner control
+5 V O DC 5 V Auxiliary voltage, max. 1 mA
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