Applications; Basic Diagram Of A Plant With A Modulating Burner (One Type Of Fuel) - Siemens RVW26.000B27 Basic Documentation

L
LP
P
W
12 13 14 4 8 5 Q13
LAL2.../LFL1.../
RWF40
Q
20
LGK16.../LOK16...
7 18 9 10 11 Y2
BV
N
Legend
Siemens Building Technologies
HVAC Products
16

Applications

16.1 Basic diagram of a plant with a modulating
burner (one type of fuel)
(Using the LAL..., LFL1..., LGK16... or LOK16... as a burner control and the
RWF40... as a load controller)
EK
1K9
Q14 Q5 Q1 L F1 Q4 TxD RxD GND
RVW25.000B27
Y1 Y20 Y10 Q3A Q3B N H Q2 Y7 B1
AL1
1K8
Fig. 26 Basic diagram with a modulating burner
AL Indication of nonreadiness
BV Fuel valve
EK Lockout reset button
FU Variable speed drive
The following contacts are included in the burner control's start control loop (terminals
4..5):
· Readiness contact «Q4...Q5» of the RVW25... and RVW26...
·
The burner's on / off contact «Q13...Q14» of the load controller
· Limit thermostat «W» or gas pressure switch
In the event of lockout, the RVW25... and the RVW26... can be reset by pressing lock-
out reset button «EK» in the supply line. Fuel selector «F1» is connected to the line.
Terminal «F2» is not used so that the curves and parametes for fuel 1 are permanently
selected. The variable speed drive acts on the fan speed, «SA2» on the fuel valve.
«SA4», «SA5» and «SA7» are optional auxiliary actuators that can be installed if re-
quired. Signal lamp «AL» can be used for indicating faults of the RVW25... and
RVW26... With power ON of the RVW25... and RVW26... (during the self-test) the lamp
lights up for a short moment.
When sensing terminal «H» with a programmable logic controller, it must be taken into
account that with power ON or after a reset of the RVW25... and RVW26..., nonreadi-
ness or a fault of the RVW25... and RVW26... will be signaled for about 2 seconds.
Electronic Air / Fuel Ratio Control System
16 Applications
Q5 Q4 L
M X1 X3 M M U3 U1 Y8 Y20 Y10 Q3 Q2
AGK34 TG
RxD TxD GND F1
RVW26.000B27
N H Q1 U10 B2 M Y3 Y4 U10 B4 M Y5
1 2 1
M M
AUX1 AUX2
SA5 SA7
AL2
1K9
LP Air pressure switch
M Fan motor
SA... Actuator of ... damper
TG Tacho-generator
W Limit thermostat or pressure switch
FU
Y6 X3 M M
1K8
2
M
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CC1P7873.1en
15.10.2002