Siemens RWD45U User manual

RWD45U Controller
Installation and
Commissioning Guide
Document No. 129-409
October 5, 2009
Item Number 129-409, Rev. BA
Function RWD45U controllers are intended for HVAC and Refrigeration systems including Heat
Pumps. They are suitable for 1-, 2-, and 3-stage compressors.
Input X1 detects the actual room or space temperature and compares it with the
setpoints. Depending on the deviation, the controller acts accordingly with its outputs to
achieve the desired setpoints. The RWD45U controller has a modulating 0 to 10 Vdc
output for economizer control or an additional independent control loop.
Function Summary •Controller – Stand-alone controller with four two-position (On/Off) outputs, and one
modulating 0 to 10 Vdc output.
•Universal input (X1) for the main temperature sensor.
•Universal input (X2) for the following auxiliary functions:
On/Off (Standby) Setpoint reset
Remote setting unit Sensor averaging
Alarm Winter/Summer setpoint changeover
Filter alarm Sensor select
•Universal input (X3) for the following functions:
−Economizer
−Second independent loop
•Digital input (D1) for the following digital functions:
−Day/night changeover setpoint
−On/Off (Standby)
−Alarm
−Filter alarm
•The RWD45U controller is intended for either DIN rail mounting in a switchboard or
screw mounting with a protective enclosure.
•Desired output configuration and auxiliary function must be entered for initial set-
up. See Initial Program Settings (New Controller).
Application The RWD45U has standard pre-configured applications. There are nine main
configuration loops with combinations of ten auxiliary functions. See Table 1.

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 2 of 13 Siemens Industry, Inc.
Table 1. Application Numbers.
H = Heating
C = Cooling
Cr = Compressor
RV = Reversing valve
Eco = Economy
Main Loop
RV
RV
Auxiliary Loop
#1 × (2H2C + Eco Cool)
#2 × (3Cr
Setpoint reset
+ RV cool +
Eco Cool)
#3 × (3Cr + RV heat + Eco Cool)
#x0 (Standby)
#10
#20
#30
#x1 (Remote setpoint)
#11
#21
#31
#x2 (Alarm)
#12
#22
#32
#x3 (Filter alarm)
#13
#23
#33
#x4 (Setpoint reset)
#14
#24
#34
#x5 (Avg. X1, X2)
#15
#25
#35
#x6 (Win/Sum Digital)
N/A
N/A
N/A
#x7 (Win/Sum Analog)
N/A
N/A
N/A
#x8 (Sensor select)
#18
#28
#38
#x9 (Active input)
#19
#29
#39
H = Heating
C = Cooling
Cr = Compressor
RV = Reversing valve
Eco = Economy
Main Loop
RV
RV
Auxiliary Loop
#4 × (2H2C + Eco Heat)
#5 × (3Cr + RV cool + Eco Heat)
#6 × (3Cr + RV Heat + Eco Heat)
#x0 (Standby)
#40
#50
#60
#x1 (Remote
setpoint)
#41 #51 #61
#x2 (Alarm)
#42
#52
#62
#x3 (Filter alarm)
#43
#53
#63
#x4 (Setpoint reset)
#44
#54
#64
#x5 (Avg. X1, X2)
#45
#55
#65
#x6 (Win/Sum Digital)
N/A
N/A
N/A
#x7 (Win/Sum
Analog)
N/A N/A N/A
#x8 (Sensor select)
#48
#58
#68
#x9 (Active input)
#49
#59
#69
H = Heating
C = Cooling
Cr = Compressor
RV = Reversing valve
Eco = Economy
Ind = Independent
Main Loop
RV
RV
Auxiliary Loop
#7 × (2H2C + Ind Y)
#8 × (3Cr + RV cool + Ind Y)
#9 × (3Cr + RV Heat + Ind Y)
#x0 (Standby)
#70
#80
#90
#x1 (
Remote setpoint)
#71
#81
#91
#x2 (Alarm)
#72
#82
#92
#x3 (Filter alarm)
#73
#83
#93
#x4 (Setpoint reset)
#74
#84
#94
#x5 (Avg. X1, X2)
#75
#85
#95
#x6 (Win/Sum Digital)
#76
#86
#96
#x7 (Win/Sum Analog)
#77
#87
#97
#x8 (Sensor select)
#78
#88
#98
#x9 (Active input)
#79
#89
#99

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
October 5, 2009
Siemens Industry, Inc. Page 3 of 13
NOTE: Three-stage applications are also used for one- and two-stage applications. Compressor stages are
selected during commissioning.
Example: Two-stage compressor with reversing valve on heating, economy cooling, and two averaging
sensors: #35.
Table 2. Input Configurations – X1, X2, X3 and D1.
Applications 10 Through 69
X1 X2 X3
D1 Options
Filter
Alarm
Alarm
Day/Night
Standby
#x0 (Standby)
Main
Standby
Eco
♦ ♦ ♦
–
#x1 (Remote
setpoint)
Main Remote setpoint Eco ♦♦♦♦
#x2 (Alarm)
Main
Alarm
Eco
♦
–
♦ ♦
#x3 (Filter alarm)
Main
Filter alarm
Eco
–
♦ ♦ ♦
#14, 24, 34 (Setpoint
Reset) *
Main Setpoint reset +
Eco (cool)
Standby ♦♦♦–
#44, 54, 64 (Setpoint
Reset)
Main
Setpoint reset
Eco
(heat)
♦♦♦♦
#x5 (Avg. X1, X2) Main Main Eco ♦
♦ ♦ ♦
#x6 (Win/Sum
Digital)
N/A
N/A
N/A
–
–
–
–
#x7 (Win/Sum
Analog)
N/A
N/A
N/A
–
–
–
–
#x8 (Sensor select)
Main
Main
Eco
♦ ♦ ♦ ♦
#x9 (Active input)
Main
Standby
Eco
♦ ♦ ♦
–
* For applications 14, 24, and 34, the X2 sensor (outside air temperature) is used for both economizer and setpoint reset
shift.
Applications 70 Through 99
X1 X2 X3
D1 Options
Filter
Alarm
Alarm
Day/Night
Standby
#x0 (Standby)
Main
Standby
Ind
♦ ♦ ♦
–
#x1 (Remote
setpoint)
Main
Remote setpoint
Ind
♦♦♦♦
#x2 (Alarm)
Main
Alarm
Ind
♦
–
♦ ♦
#x3 (Filter alarm)
Main
Filter alarm
Ind
–
♦ ♦ ♦
#x4 (Setpoint reset)
Main
Setpoint reset
Ind
♦ ♦ ♦ ♦
#x5 (Avg. X1, X2) Main Main Ind ♦
♦ ♦ ♦
#x6 (Win/Sum
Digital)
Main
Win/Sum digital
Ind
♦♦♦♦
#x7 (Win/Sum
Analog)
Main
Win/Sum analog
Ind
♦♦♦♦
#x8 (Sensor select)
Main
Main
Ind
♦ ♦ ♦ ♦
#x9 (Active input)
Main
Standby
Ind
♦ ♦ ♦
–

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 4 of 13 Siemens Industry, Inc.
Table 3. Output Configurations – Q1, Q2, Q3, Q4, and Y1.
Application
Numbers
Q1
Q2
Q3
Q4
Y1
10 through 19
Heating Stage 2 (H2) Heating Stage 1 (H1) Cooling Stage 1 (C1) Cooling Stage 2 (C2) Eco Cool
40 through 49
Eco Heat
70 through 79
Ind
Application
Numbers
Q1
Q2
Q3
Q4
Y1
20 through 29
Reversing Valve (RV)
Cool
Compressor Stage 1
(Cr1) Compressor Stage 2 (Cr2) Compressor Stage 3 (Cr3)
Eco Cool
30 through 39
Reversing Valve (RV)
Heat
50 through 59
Reversing Valve (RV)
Cool
Eco Heat
60 through 69
Reversing Valve (RV)
Heat
80 through 89
Reversing Valve (RV)
Cool
Ind
90 through 99
Reversing Valve (RV)
Heat
NOTE: Application sheets for the listed applications are available on line.

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
October 5, 2009
Siemens Industry, Inc. Page 5 of 13
Display Explanation
Symbol
Description
Setting Range
Symbol
Description
Setting Range
Main Screen
Adjustable setting screen
TOOL
PC communication port
being used
#
10
Application Numbers
10 through 99 (Not
consecutive numbers)
OUT RANGE
The setting is out of range

Daytime operation
Err
Sensor error

Night time operation
Sec
Seconds
X1
Universal (Main) Input X1
Ni 1000
Ω
: -58°F to 302°F
(50°C to 150°C)
(unchangeable)
Pt 1000 Ω: -4°F to 356°F
(-20°C to 180°C)
(unchangeable)
0 Vdc to 10 Vdc: -100 to
2400
X2
Universal (Auxiliary) Input
Ni 1000
Ω
: -58°F to 302°F
(50°C to 150°C)
(unchangeable)
Pt 100 0Ω: -4°F to 356°F
(-20°C to 180°C)
(unchangeable)
0 Vdc to 10 Vdc: -100 to
2400
Variable resistor: the
resistance range should be
within 0
Ω
to 1000
Ω
X3
Universal input X3
Ni 1000
Ω
: -58°F to 302°F
(50°C to 150°C)
(unchangeable)
Pt 1000 Ω: -4° to 356°F-
(-20°C to 180°C)
(unchangeable)
0 Vdc to 10 Vdc: -100 to
2400
Indicates cooling
°C
Celsius scale
Indicates heating
°F
Fahrenheit scale
SP-h
Setpoint on the heating side
for temperature control
----
No unit (e.g., pressure, air
quality and air volume flow)
SP-c
Setpoint on the cooling side
for temperature control
K
Kelvin
Y1
Analog output
0 to 10V
%
Percentage scale
Q
Digital outputs
Output status = Off
ECO
Economy mode
Output status = On
R/V
Reversing valve status = On
Standby mode
OFF
Controller = Off
ON
Controller = on standby
PS 4 – Differentials and Delays
SD
Switching Differential
0.1 K to 50 K
TD1
Time Delay for heat ⇔
cool
0 to 4,096 sec
T
ON
Minimum switch on time
for Q
0 to 4,096 sec
TD2
Time Delay for next
stage ON
0 to 4,096 sec
T
O
FF
Minimum switch off time
for Q
0 to 4,096 sec
PS 3 – Auxiliary Control Loop Set-up
Setpoint reset shift
(Start point, end point and
shift differential)
Y1
Heating or reverse acting
output
Setpoint reset shift
(Start point, end point and
shift differential)
Y1
Cooling or direct acting
output
SUM
Summer changeover point
D1
Digital input function
WIN
Winter changeover point
TN
Integral action time
0 to 4,096 sec
Time delay from Winter
⇔
Summer changeover point
XP
Proportional Band
Ni: 0.5 to 180 K
Pt: 0.5 to 180 K
Active input: depends on the
sensor range
+
-

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 6 of 13 Siemens Industry, Inc.
Display Explanation, Continued
Symbol
Description
Setting Range
Symbol
Description
Setting Range
PS 2 – Unit X1, X2 and X3 Sensor Type and Sensing Range Definition
Unit
Define unit
°F or °C
ΔX1
Calibration offset for X1
(Ni and Pt sensor only)
-9°F to 9°F
-5 K to 5 K or
X1NI 1000
X1 is Ni 1000
Ω
temperature sensor
Ni 1000
Ω
: -58°F to 302°F
(-50°C to 150°C) (unchangeable)
ΔX2
Calibration offset for X2
(Ni and Pt sensor only)
-9°F to 9°F
-5 K to 5 K or
X2NI 1000
X2 is Ni 1000 Ω
temperature sensor Ni 1000 Ω: -58°F to 302°F (-50°C to 150°C) (unchangeable)
ΔX3
Calibration offset for X3
(Ni and Pt sensor only)
-9°F to 9°F
-5 K to 5 K or
X3NI 1000
X3 is Ni 1000 Ω
temperature sensor
Ni 1000 Ω: -58°F to 302°F
(-50°C to 150°C) (unchangeable)
X1L
Start point of the X1
(for 0 to 10 Vdc only)
-100 to 2400
X1Pt 1000
X1 is Pt 1000
Ω
temperature sensor
Pt 1000
Ω
: -4°F to 356°F
(-20°C to 180°C) (unchangeable)
X2L
Start point of the X2
(for 0 to 10 Vdc only)
-100 to 2400
X2Pt 1000
X2 is Pt 1000
Ω
temperature sensor
Pt 1000
Ω
: -4°F to 356°F
(-20°C to 180°C) (unchangeable)
X3L
Start point of the X3
(for 0 to 10 Vdc only)
-100 to 2400
X3Pt 1000
X3 is Pt 1000
Ω
temperature sensor
Pt 1000
Ω
: -4°F to 356°F
(-20°C to 180°C) (unchangeable)
X1H
Stop point of the X1
(for 0 to 10 Vdc only)
-100 to 2400
X1 0-10
X1 is 0 to 10 Vdc input
sensor
0 to 10 Vdc: -100 to 2400
X2H
Stop point of the X2
(for 0 to 10 Vdc only)
-100 to 2400
X2 0-10
X2 is 0 to 10 Vdc input
sensor
0 to 10 Vdc: -100 to 2400
X3H
Stop point of the X3
(for 0 to 10 Vdc only)
-100 to 2400
X3 0-10
X3 is 0 to 10 Vdc input
sensor
0 to 10 Vdc: -100 to 2400
X2SP
Remote setpoint
0 to 10 Vdc or
0 to 1000 Ω
X3
If X3 is independent
control
°C, °F, % ----(no unit display),
X1: 0 to 50°C ⇒Y1: 0 to 10 Vdc **
X2VR
Variable Resistor
0 to 1000 Ω
PS 1 – Application Number Selection:
Standby mode
AVERAGE
Averaging sensor X1 and
X2
REM
Remote setting
WIN/SUM
AnG
Winter/Summer
changeover by analog
input
ALARM
Alarm indication
WIN/SUM
diG
Winter/Summer
changeover by digital
input
FILTER
Filter alarm indication
X2
⇔
X1
Selecting X2 or X1 as the
main sensor
COMP
Setpoint reset function
Act
Active sensor input
** (X1: 32°F to 122°F (0°C to 50°C) ⇒Y1: 0 to 10 Vdc). The independent Y1 is programmed as a 0 to 10 Vdc
output corresponding to a temperature range of 32°F to 122°F (0°C to 50°C) for sensor input X1 (Ni1000,
Pt1000). When this function is selected there is no economizer or a second independent control loop, and input
X3 is not used.
Commissioning
Guide
Commissioning is implemented via push buttons on the controller. The push buttons
have the following functions:
Press Button to enter the PS page OR edit and save the value when the page
appears with the logo
Press
+
Button for viewing the next page OR to increase the value.
Press Button for viewing the previous page OR to decrease the value.
Changing a parameter
1. Press the SEL λbutton.
:
2. Press the + σor –τbutton to increase or decrease the flashing parameter.
3. Press the SEL λbutton to save the value (During PS mode, the values are saved only after exiting the PS mode).
NOTE: A 9-pin port is provided for optional commissioning via Siemens software tool. See Software Tool
(Optional Programming).
SEL
+

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
October 5, 2009
Siemens Industry, Inc. Page 7 of 13
Initial Program
Settings
(New Controller)
There are five levels of parameter setting (PS) modes: PS1 through PS4, and a
setpoint mode. Each PS has a set of default parameters, which can be changed during
commissioning.
When powered the first time, the controller will proceed to PS1 with default
application 10. See below for commissioning steps.
PS 1 – Application Settings
Range/Type
Default
Enter application number
10 through 99
10
Select number of compressor stages
1-, 2- or 3-stage
2-stage
Select reversing valve output – On or Off during no demand
On or Off
Off
After completing PS1, the user has the option to progress to setpoint mode (only for new RWD) by waiting for
two seconds and default parameters will be accepted. If parameters PS2 through PS4 need to be adjusted,
press the +σbutton immediately to the next PS (see Commissioning Flowchart).
PS 2 – Input X1, X2 and X3
Range/Type
Default
Select unit
°F or °C
°F
Select main sensor X1
Ni1000, Pt1000, 0 to 10V
Ni1000
Enter X1 sensor calibration offset (Ni or Pt only)
±
5 K
0 K
Enter X1 active sensor range (0 to 10 Vdc only) -100 to 2400 32°F to 122°F
(0°C to 50°C)
Select auxiliary sensor X2
Ni1000, Pt1000, 0 to 10 Vdc
Ni1000
Enter X2 sensor calibration offset (Ni or Pt only)
±
5 K
0 K
Enter X2 active sensor range (0 to 10 Vdc only)
-100 to 2400
32°F to 122°F
(0°C to 50°C)
Select sensor X3 (for Economizer sensor)
Ni1000, Pt1000, 0 to 10 Vdc
Ni1000
Enter X3 sensor calibration offset (Ni or Pt only)
±
5 K
0 K
Enter X3 active sensor range (0 to 10 Vdc only) -100 to 2400 32°F to 122°F
(0°C to 50°C)
Select unit for X3 (for Independent control sensor) C, F, %, -----, or
X1 32°F to 122°F (0°C to
50
°
C)
⇒
Y1 (0 to 10 Vdc)
F
Select X3 sensor
Ni1000, Pt1000, 0 to 10 Vdc
Ni1000
Enter X3 sensor calibration offset (Ni or Pt only)
±
5 K
0 K
Enter X3 active sensor range (0 to 10 Vdc only)
-100 to 2400
32°F to 122°F
PS 3 – Digital, Auxiliary Function, Eco and Ind. (Y)
Range/Type
Default
Select digital input D1
D/N, Filter Alarm, Alarm, on/off
Depends on #x
Aux. Function = Setpoint reset
Setpoint reset start point, reverse acting
Setpoint reset sensor range
72°F (22°C)
Setpoint reset end point, reverse acting
Setpoint reset sensor range
64°F (18°C)
Setpoint reset shift
Setpoint reset sensor range
4K
Setpoint reset start point, direct acting
Setpoint reset sensor range
82°F (28°C)
Setpoint reset end point, direct acting
Setpoint reset sensor range
90°F (32°C)
Setpoint reset shift
Setpoint reset sensor range
4K
Aux. function = WIN SUM analog
Enter changeover setpoint for winter
Sensor range
72°F (22°C)
Enter changeover setpoint summer
Sensor range
82°F (28°C)
Enter changeover time delay, winter
⇔
summer
00.01 to 23 Hrs 59 min
00.01

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 8 of 13 Siemens Industry, Inc.
PS 3 – Digital, Auxiliary Function, Eco and Ind. (Y) (Continued)
Range/Type
Default
For Economy mode (Eco)
Enter min limit for Eco mode to operate
Sensor range
55°F (13°C)
Enter max limit for Eco mode to operate
Sensor range
64°F (18°C)
Enter P-band for Eco Y1, XP
Sensor range
1 K
Enter min value for Eco Y1 output
0 to 100%
0%
Enter max value for Eco Y1 output
0 to 100%
100%
For Independent Y1
Select control action
Direct or Reverse acting
Direct
Enter P-band, XP
Sensor range
4 K
Enter Integral time (TN)
0 to 4,096 s
256 s
Enter min value for Ind. Y1 output
0 to 100%
0%
Enter max value for Ind. Y1 output
0 to 100%
100%
PS 4 – Differentials and Time Delays
Range/Type
Default
Enter switching differential (SD) for output stage 1, 2, and 3
Sensor range
1 K
Enter min On time for output stage 1, 2, and 3
0 to 4,096 s
0 s
Enter min Off time for output stage 1, 2, and 3
0 to 4,096 s
60 s
Enter time delay TD for next stage On
0 to 4,096 s
30 s
Enter changeover time delay TD, heating
⇔
cooling demand
0 to 4,096 s
120 s
Setpoint Mode
Range/Type
Default
Enter SP-h1
Sensor range
70°F (21°C)
Enter SP-h2
Sensor range
68°F (20°C)
Enter SP-h3
Sensor range
66°F (19°C)
Enter SP-c1
Sensor range
73°F (23°C)
Enter SP-c2
Sensor range
75°F (24°C)
Enter SP-c3
Sensor range
77°F (25°C)
If D1 is set for Day/Night
Enter night SP-h1
Sensor range
64°F (18°C)
Enter night SP-h2
Sensor range
63°F (17°C)
Enter night SP-h3
Sensor range
61°F (16°C)
Enter night SP-c1
Sensor range
79°F (26°C)
Enter night SP-c2
Sensor range
81°F (27°C)
Enter night SP-c3
Sensor range
82°F (28°C)
For remote setpoint – Heating stage 1 is the remote setpoint and the
reference point. A ∆SP is set between the stages.
H2 C1
C2
Remote
Setpoint
H3
C2
Enter
∆
SP H2
Sensor range
-1 K
Enter
∆
SP H3
Sensor range
-2 K
Enter ∆SP C1 Sensor range 2 K
Enter
∆
SP C2
Sensor range
3 K
Enter
∆
SP C3
Sensor range
4 K
After completing the setpoints, press + button for the main display.

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
October 5, 2009
Siemens Industry, Inc. Page 9 of 13
Main Display
(Normal Operation) The controller is active during main display.
The main display shows:
1. Whether Q.. is On or Off (= Off, ν= On).
2. X1 temperature in °F or °C.
3. Y1 output in volts DC.
4. Day/night settings (= day, = night).
5. Reversing valve status (= Off, R/V = On).
Figure 1. Main Display.
Other displays are available by pressing the +▲button and the various displays are listed below.
1. Setpoints
2. Digital input active or inactive
3. X2 sensor reading
4. X3 sensor reading
5. Q… output status
6. Y1 output in volts DC
7. Application #xx
Figure 2. Setpoint Display.
Changing Setpoint in
Main Display On entering any of the setpoint displays, the setpoint on display can be adjusted by
pushing the SEL λbutton. Increase value by pressing the + ▲button, or decrease the
value by pressing the
−
▼button. When the required value is reached, press the SEL λ
button to save the new value.
Time out
For setpoint adjustment during normal operation the controller will exit the setting after 20
seconds, and return to the main screen. However, for setpoint adjustment in PS mode, there is
no time limit. The controller remains in the PS mode until the user completes the entire process.
NOTE:
•Changing the heating setpoints to a lower value, set SP-h3 before setting SP-h2
and SP-h1.
•Changing the cooling setpoints to a higher value, set SP-c3 before setting SP-c2
and SP-c1.
•The controller will display an ‘out range’ message if SP-h3 > SP-h2>SP-h1 and
SP-c1>SP
-c2>SP-c3.

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 10 of 13 Siemens Industry, Inc.
+
Main Display to PS Mode Press both buttons, and hold for five seconds to enter the PS mode. PS4 will appear
first.
Press the button to scroll down to the right PS for editing parameters.
Software Tool
(Optional
Commissioning)
A software tool for the controller application selection and parameter adjustment is
available. It is a user-friendly Windows® 95 (or later) based software tool. The software
tool has the following functions:
Adjusting all available parameters.
Uploading and downloading the program.
Saving parameter settings.
Viewing or providing a print-out of the settings.
Parameters can be hidden from displaying.
Commissioning
Flowchart
Figure 3. Commissioning Flowchart.

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
October 5, 2009
Siemens Industry, Inc. Page 11 of 13
Wiring Terminals
NOTE: Screwed terminals for cables with min
2 × 16 or 1 × 14 AWG.
Figure 4. Wiring Terminals.
G, G0 SELV 24 Vac power supply
D1 Digital input
M Ground (G0) for signal inputs
and universal inputs
Q1 to Q4 Relay outputs Max. rating 24
to 240 Vac
Vac/5A res/5 FLA/30 LRA/
1/2 HP
X1 Signal input (main input: Ni
1000, Pt 1000 and 0 to 10 Vdc)
X2 Signal input (aux input Ni 1000,
Pt 1000, 0 to 10 Vdc, remote
setting unit and digital input)
X3 Signal input (Eco sensor or
2nd loop input: Ni1000,
Pt1000, 0 to 10 Vdc)
Y1 Analog output 0 to 10 Vdc
Tool Communication port for PC
(9-pin plug)
Wiring Diagrams
CR1
CR2
CR3
RV
Y1
X1
X2
X3
S1
PC
NOTE:
Compressor stage 1
Compressor stage 2
Compressor stage 3
Reversing valve relay
Equipment with 0 to 10 Vdc input
(Damper actuators)
Room temperature sensor
Auxiliary sensor or a digital input
Economy or 2nd loop sensor
Switch or time clock
Personal computer
For a single compressor, CR2 and
CR3 are not connected.
For a dual compressor, CR3 is not
connected
Figure 5. Applications 20 through 39, 50 through 69, and 80 through 89.
C1
C2
H1
H2
Y1
X1
X2
X3
S1
PC
Cooling stage 1
Cooling stage 2
Heating stage 1
Heating stage 2
Equipment with 0 to 10 Vdc input
(Damper actuators)
Room temperature sensor
Auxiliary sensor or a digital input
Economy or 2nd loop sensor
Switch or time clock
Personal computer
Figure 6. Applications 10 through 19, 40 through 49, and 70 through 79.
CAUTION:
The TOOL signal ground is galvanically connected to G0 inside the controller. If the signal line of the computer
is gr
ounded to Earth, the G0 line after TOOL connection will be grounded as well. This will change the SELV
to a PELV.

Document Number 129-409 RWD45U Controller Installation and Commissioning Guide
October 5, 2009
Page 12 of 13 Siemens Industry, Inc.
Installation
Mounting Notes
Figure 7. Mounting Options.
The RWD45U can be mounted as follows:
Observe all local installation and mounting regulations.
A On a DIN rail (EN 50 022-35 x 7.5) at least 4.75 inches (120 mm) long for
RWD45U.
B Wall-mounted with two screws. (Minimum length of the screws should be
2.75 inches (70 mm) (φ3.2 mm).
C Front-mounted using standard elements:
•One DIN rail 5.90 inches (150 mm) long for RWD45U
•Two hexagonal placeholders 1.96 inches (50 mm)
•Washers
•Screws
NOTE: (Ensure all terminations are tightened before final mounting to front
panel.)
D Inside the ARG62.21.
WARNING:
There must be a minimum of 0.31 inches (8 mm) distance from
terminations to panel/enclosures to avoid electric shock.
Electrical Installation
Notes •Standard cables can be used for the controller. However, when mounting in an
environment greatly exposed to EMI, use only shielded cables.
•The RWD45U is designed for 24 Vac operating voltage.
•Use safety insulating transformers with double insulation as per EN 60742; they
must be designed for 100% Duty.
•When using several transformers in one system, the connection terminals G0
must be galvanically connected.
•Supplying voltages above 24 Vac to low voltage connections may damage or
destroy the controller or any other connected devices. Additionally, connections
to voltages exceeding 24 Vac endanger personal safety.

RWD45U Controller Installation and Commissioning Guide Document Number 129-409
September 7, 2007
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and
models as design improvements are introduced. . Windows is a registered trademark of Microsoft Corporation. Other product or company
names mentioned herein may be the trademarks of their respective owners. © 2009 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
+ 1 847-215-1000
Your feedback is important to us. If you have
comments about this document, please send them
to SBT_technical.[email protected]om
Document No. 129-409
Printed in the USA
Page 13
Dimensions
Figure 8. RWD45U Controller Dimensions in Inches, (Millimeters).
Figure 6. ARG62.21 Enclosure Dimensions in Inches (Millimeters).