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RWD44U Controller
Function
Function Summary
Application
Item Number 129-408, Rev. BA
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.
•
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)
Remote setting unit
Alarm
Filter alarm
•
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).
The RWD44U has standard pre-configured applications. There are three main
configuration loops with combinations of ten auxiliary functions. See Table 1.
Installation and
Commissioning Guide
Document No. 129-408
Setpoint reset
Sensor averaging
Winter/Summer setpoint changeover
Sensor select
October 5, 2009
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Related Manuals for Siemens RWD44U
Summary of Contents for Siemens RWD44U
- Page 1 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).
- Page 2 Document Number 129-408 RWD44U Controller Installation and Commissioning Guide October 5, 2009 Table 1. Application Numbers. Main Loop H = Heating C = Cooling Cr = Compressor RV = Reversing valve Eco = Economy Auxiliary Loop #1 × (2H & 2C) #2 ×...
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Page 3: Display Explanation
RWD44U Controller Installation and Commissioning Guide Document Number 129-408 October 5, 2009 Display Explanation Symbol Description Setting Range Symbol Description Setting Range Main Screen Adjustable setting screen TOOL PC communication port being used Application No 10 through 39 OUT RANGE... -
Page 4: Commissioning Guide
Press the SEL button 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... - Page 5 RWD44U Controller Installation and Commissioning Guide Document Number 129-408 October 5, 2009 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)
- Page 6 Document Number 129-408 RWD44U Controller Installation and Commissioning Guide October 5, 2009 Main Display The controller is active during main display. (Normal Operation) The main display shows: = Off, ν = On) Whether Q... is On or Off ( X1 temperature in °F or °C.
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Page 7: Commissioning Flowchart
RWD44U Controller Installation and Commissioning Guide Document Number 129-408 October 5, 2009 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. -
Page 8: Wiring Terminals
Document Number 129-408 RWD44U Controller Installation and Commissioning Guide October 5, 2009 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... -
Page 9: Installation
Wall-mounted with two screws. (Minimum length of the screws should be 2.75 inches (70 mm) (φ3.2 mm) 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 •... - Page 10 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.