User Manual

Siemens Building Technologies Application :23 RWD32/23 - 02.2001
HVAC Products RWD32 2
The temperature sensor senses the room conditions and on a fall in temperature
the RWD32 via Q1 digital output energises stage 1 of the electric heater.
On a further fall in temperature, Q2 digital output energises stage 2 of the electric
heater.
Relative supply air control is maintaining maximum and/or minimum difference
between supply air and room temperature setpoint when the temperature
difference drops below or exceeds the limiter setpoints.
The limiter function overrides the standard control function to maintain the limiter
setpoints.
Heating sequences
Q2
Load
Stage 1 Heating Setpoint
OFF
ON
SD SD
2
2
SD
Stage 2 Heating Setpoint
Heating
SD SD
2
2
ON
OFF
SD
Q1
Heating
L
S1
D1
N
BM
X1 X2MM
X1
M
G AC 24 V
Q12 Q14
RWD32
Q11
Q22 Q24
Q21
Q1 Q2
N1
TOOL
PC
G
(L) AC 230 V
Q1
N
GO
Q2
PS
HLT
HR
BM
G
X2
RWD32
N1 RWD32 controllers
X1 Main temperature sensor
X2 Limit temperature sensor
S1 Time clock or switch
Q1 Stage 1 electric heater
Q2 Stage 2 electric heater
PS Pressure switch
HLT High limit thermostat
HR Heater relay
PC Personal computer
Description of operation
Function diagram
Connection diagram