Siemens RWD44U User manual

RWD44U Controller
Installation and
Commissioning Guide
Document No. 129-408
October 5, 2009
Item Number 129-408, Rev. BA
Function RWD44U 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 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.
Function Summary •Controller – Stand-alone controller with four two-position (On/Off) outputs.
•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
•Digital input (D1) for the following digital functions:
−Day/night changeover setpoint
−On/Off (Standby)
−Alarm
−Filter alarm
•The RWD44U 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 RWD44U has standard pre-configured applications. There are three main
configuration loops with combinations of ten auxiliary functions. See Table 1.

Document Number 129-408 RWD44U Controller Installation and Commissioning Guide
October 5, 2009
Page 2 of 10 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 × (2H & 2C)
#2 × (3 stage Cr + RV cool)
# 3 × (3 stage Cr + RV heat)
#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)
#16
#26
#36
#x7 (Win/Sum
Analog)
#17
#27
#37
#x8 (Sensor select)
#18
#28
#38
#x9 (Active input)
#19
#29
#39
NOTE: Three-stage compressor 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, and two averaging sensors: #35
Table 2. Input Configurations – X1, X2, and D1.
Applications 10 Through 39
X1 X2
D1 Options
Filter Alarm
Alarm
Day/Night
Standby
#x0 (Standby) Main Standby ♦
♦ ♦
–
#x1 (Remote setpoint)
Main
Remote setpoint
♦ ♦ ♦ ♦
#x2 (Alarm)
Main
Alarm
♦
–
♦ ♦
#x3 (Filter alarm)
Main
Filter alarm
–
♦ ♦ ♦
#x4(Setpoint reset) Main Setpoint reset ♦
♦ ♦ ♦
#x5 (Avg. X1, X2)
Main
Main
♦ ♦ ♦ ♦
#x6 (Win/Sum Digital)
Main
Win/Sum
♦ ♦ ♦ ♦
#x7 (Win/Sum Analog)
Main
Win/Sum
♦ ♦ ♦ ♦
#x8 (Sensor select) Main Main ♦
♦ ♦ ♦
#x9 (Active input)
Main
Standby
♦ ♦ ♦
–
Table 3. Output Configurations – Q1, Q2, Q3, and Q4.
Application
Numbers
Q1
Q2
Q3
Q4
10 through 19
Heating Stage 2 (H2)
Heating Stage 1 (H1)
Cooling Stage 1 (C1)
Cooling Stage 2 (C2)
20 through 29
Reversing Valve (RV) Compressor Stage 1 (Cr1) Compressor Stage 2 (Cr2) Compressor Stage 3 (Cr3)
30 through 39
NOTE: Application sheets for the listed applications are available online.

RWD44U Controller Installation and Commissioning Guide Document Number 129-408
October 5, 2009
Siemens Industry, Inc. Page 3 of 10
Display Explanation
Symbol
Description
Setting Range
Symbol
Description
Setting Range
Main Screen
Adjustable setting screen
TOOL
PC communication port
being used
#
10
Application No
10 through 39
OUT RANGE
The setting is out of range

Day time 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 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 1000 Ω: -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
°C
Celsius scale
Cooling
°F
Fahrenheit scale
Heating
K
Kelvin
SP-h
Setpoint on the heating side
for temperature control
Q
Digital outputs
SP-c
Setpoint on the cooling side
for temperature control
R/V
Reversing valve status = On
Output status = Off
Standby mode
Output status = On
"OFF"
Controller = Off
"ON"
Controller = on standby
PS 4 – Differentials and Delays
SD
Switching Differential
0.1 K to 50 K
TD
Time Delay from heat
⇔
cool
0 to 4,096 sec
T
ON
Minimum switch on time
for Q
0 to 4,096 sec
TD
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)
Setpoint reset shift
(Start point, End point and
Shift differential)
SUM
Summer changeover point
Time delay from Winter ⇔
Summer changeover point
WIN
Winter changeover point
D1
Digital input function
PS 2 - Unit, X1 and X2 Sensor Type and Sensing Range Definition
Unit
Define unit
°C or °F
ΔX1
Calibration offset for X1
(Ni and Pt sensor only)
-5 K to 5 K or
-9°F to 9°F
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 & Pt sensor only)
-5 K to 5 K or
-9°F to 9°F
X2NI 1000
X2 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 Vdc to 10 Vdc only)
-100 to 2400
X1Pt 1000
X1 is Pt 1000 Ωtemperature
sensor Pt 1000 Ω: -4°F to 356°F (-20°C to 180°C) (unchangeable)
X2L
Start point of the X2
(for 0 Vdc to 10 Vdc only)
-100 to 2400
X2Pt 1000
X2 is Pt 1000 Ωtemperature
sensor
Pt 1000 Ω: -4°F to 356°F
(-20°C to 180°C) (unchangeable)
X1H
Stop point of the X1
(for 0 Vdc to 10 Vdc only)
-100 to 2400
X2SP
Remote setpoint
0 Vdc to 10 Vdc or 0 to 1000
Ω
X2H
Stop point of the X2
(for 0 Vdc to 10 Vdc only)
-100 to 2400
X2Vr
Variable Resistor
0
Ω
to 1000
Ω
+
-

Document Number 129-408 RWD44U Controller Installation and Commissioning Guide
October 5, 2009
Page 4 of 10 Siemens Industry, Inc.
Display Explanation, Continued
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
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).
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 39
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 +▲button immediately to the next PS (see Commissioning Flowchart).
PS 2 – Input X1, and X
Range/Type
Default
Select unit
°F or °C
°F
Select main sensor X1
Ni 1000, Pt 1000, 0 to 10V
Ni 1000
Enter X1 sensor calibration offset (Ni or Pt only)
9°F (5°C)
0°F
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
Ni 1000, Pt 1000, 0 to 10 Vdc
Ni 1000
Enter X2 sensor calibration offset (Ni or Pt only)
±
9°F (+5°C)
0°F (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)
SEL
+

RWD44U Controller Installation and Commissioning Guide Document Number 129-408
October 5, 2009
Siemens Industry, Inc. Page 5 of 10
PS 3 – Digital and Auxiliary Functions
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
65°F (18°C)
Setpoint reset shift
Setpoint reset sensor range
8°F (4 K)
Setpoint reset n start point, direct acting
Setpoint reset sensor range
83°F (28°C)
Setpoint reset end point, direct acting
Setpoint reset sensor range
90°F (32°C)
Setpoint reset shift
Setpoint reset sensor range
8°F (4 K)
Aux. function = WIN SUM analog
Enter changeover setpoint for winter
Sensor range
72°F (22°C)
Enter changeover setpoint summer
Sensor range
83°F (28°C)
Enter changeover time delay, winter
⇔
summer
00.01 to 23 hours 59 minutes
00.01 minute
PS 4 – Differentials and Time Delays
Range/Type
Default
Enter switching differential (SD) for output stage 1, 2, and 3
Sensor range
2°F (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
74°F (23°C)
Enter SP-c2
Sensor range
76°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
62°F (17°C)
Enter night SP-h3
Sensor range
60°F (16°C)
Enter night SP-c1
Sensor range
79°F (26°C)
Enter night SP-c2
Sensor range
80°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
-2°F (-1 K)
Enter
∆
SP H3
Sensor range
-4°F (-2 K)
Enter ∆SP C1
Sensor range
4°F (2 K)
Enter
∆
SP C2
Sensor range
6°F (3 K)
Enter
∆
SP C3
Sensor range
8°F (4 K)
After completing the setpoints, press + button for the main display.

Document Number 129-408 RWD44U Controller Installation and Commissioning Guide
October 5, 2009
Page 6 of 10 Siemens Industry, Inc.
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. Day/night settings (= day, = night).
4. Reversing valve status (= Off, R/V = On).
Figure 1. Main Display.
Other displays are available by pressing the +▲button. The various displays are listed below.
1. Setpoints
2. Digital input active or inactive
3. X2 sensor reading
4. Q… output status
5. 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.

RWD44U Controller Installation and Commissioning Guide Document Number 129-408
October 5, 2009
Siemens Industry, Inc. Page 7 of 10
+
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.
NOTE: When changing from the main display to PS mode, the controller remains
active unless a parameter has been changed. Ensure all outputs are
disconnected before changing an application.
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 printout of the settings.
Parameters can be hidden from displaying.
Commissioning
Flowchart
Figure 3. Commissioning Flowchart.

Document Number 129-408 RWD44U Controller Installation and Commissioning Guide
October 5, 2009
Page 8 of 10 Siemens Industry, Inc.
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:
Siemens Ni 1000, Pt 1000 and
0 to 10 Vdc)
X2 Signal input (aux input Siemens
Ni 1000, Pt 1000, 0 to 10 Vdc,
and remote setting unit)
Tool Communication port for PC
(9-pin plug)
Wiring Diagrams
Figure 5. Applications 10 Through 19.
C1
C2
H1
H2
X1
X2
S1
PC
Cooling stage 1
Cooling stage 2
Heating stage 1
Heating stage 2
Room temperature sensor
Auxiliary sensor or a digital input
Switch or time clock
Personal computer (optional, for
set-up only)
Figure 6. Applications 20 Through 39.
CR1
CR2
CR3
RV
X1
X2
S1
PC
Compressor stage 1
Compressor stage 2
Compressor stage 3
Reversing valve relay
Main temperature sensor
Auxiliary sensor or a digital input
Switch or time clock
Personal computer (optional, for
set-up only)
NOTE: For a single
compressor, CR2 and
CF3 are not
connected. For a dual
compressor, CR3 is
not connected.
CAUTION:
The TOOL signal ground is galvanically connected to G0 inside the controller. If the signal line of the computer
is grounded to Earth, the G0 line after TOOL connection will be grounded as well. This will change the SELV
to a PELV.

RWD44U Controller Installation and Commissioning Guide Document Number 129-408
October 5, 2009
Siemens Industry, Inc. Page 9 of 10
Installation
Mounting Notes
Figure 7. Mounting Options.
The RWD44U can be mounted as follows:
Observe all local installation and mounting regulations.
A On a DIN rail (EN 50 022-35 × 7.5) at least 4.75 inches (120 mm) long for
RWD44U.
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 RWD44U
•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 (single RWD44U).
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 RWD44U is designed for 24 Vac operating voltage.
•Low voltage must comply with the requirements for safety extra-low voltage
(SELV) as per EN 60730.
•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 42 Vac endanger personal safety.

Document Number 129-408 RWD44U Controller Installation and Commissioning Guide
October 5, 2009
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. © 2007 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. 129-408
Printed in the USA
Page 10 of 10
Dimensions
Figure 8. RWD44U Controller Dimensions in Inches (Millimeters).
Figure 9. ARG62.21 Enclosure Dimensions in Inches (Millimeters).