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RWD Heatpump Controllers

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					                                                     RWD Heat Pump controllers



                                        RWD Heat Pump Controllers




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                  1
                                               Xavier Zabalegui/David Jefferson
                                                           Heat pump Controllers


               Why?

                Rapid growth in the use of heat-pump technology throughout North America

                Sell applications, not components

                Increase sales of valves and damper actuators

                  Wholesalers purchasing competitor’s controllers (T775, A350)

                Increase RWD range

                RWD suitable for commercial applications




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                   2
                                               Xavier Zabalegui/David Jefferson
                                                                         RWD44U




                                                                                  „   Standard RWD design
                                                                                  „   New LCD with clear heat/cool output status
                                                                                  „   New Digital input options
                                                                                  „   Alarm inputs
                                                                                  „   Suitable for Ni1000, Pt1000 or 0-10vdc inputs
                                                                                  „   Heat/cool or reversing valve/compressor config
                                                                                  „   Flexible output delay times
                Our standard solution for commercial heat                         „   Usable defaults
                pumps.
                Easy and flexible settings


January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                                      3
                                               Xavier Zabalegui/David Jefferson
                                                          RWD Heat pump controllers




                RWD44U

                          Standard RWD format with LCD
                          Button or software tool parameter setting
                          (4) digital outputs configurable
                          Air to Air / Air to Water Heat-pumps
                          Suitable for single, dual and triple compressor units
                          Auxiliary functions applicable to Heat-pumps
                          24vac




January 2003   Siemens Building Technologies        RWD heatpump controllers
                                                                                       4
                                                    Xavier Zabalegui/David Jefferson
                                                                       RWD44U Internal diagram




               “Removable terminals are also labeled.                                     G       D1 GND X1    M   X2   M                   TOOL
                 Disconnect when commissioning”                                             RWD44
                                                                                                              Q1            Q2        Q3      Q4


                                                                                         G0              14 11     22 24 21      32 34 31   44 41




               D1                              Digital Input
               G, G0                           AC24V supply
               M                               Ground (G0) for signal inputs and universal inputs
               Q…                              Relay outputs, various voltages permissible
               X1                              Signal input (main input: Ni 1000, Pt 1000 and DC0 …10 V)
               X2                              Signal input (aux. Input: Ni 1000, Pt 1000, DC0 …10 V & remote setting unit)
               Tool                            Communication port with PC (9-pin plug)




January 2003   Siemens Building Technologies                   RWD heatpump controllers
                                                                                                                        5
                                                               Xavier Zabalegui/David Jefferson
                                                   Two-stage heating and cooling




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                   6
                                               Xavier Zabalegui/David Jefferson
                                               Three stage (CR)compressor - (RV)reversing valve




                                                            S1= D/N C/O
                                                            X1= main sensor
                                                            X2= Remote setpoint




January 2003   Siemens Building Technologies          RWD heatpump controllers
                                                                                           7
                                                      Xavier Zabalegui/David Jefferson
                                               RWD44U/45U Aux Functions & Digital Input options



                      Auxiliary Functions                                                         Digital input options
                       Remote setpoint                                                            Standby (on/off)
                       Compensation shift                                                         Alarm
                       Two sensor averaging                                                       Filter alarm
                       Winter/summer setpoint                                                     Day/night setpoints
                      selection
                       Sensor select
                       Active input                                                      # Refer to application chart for
                                                                                                   combinations



January 2003   Siemens Building Technologies           RWD heatpump controllers
                                                                                                                8
                                                       Xavier Zabalegui/David Jefferson
                                                     RWD44U/45U Digital input options


                                  Standby (on/off)
                                                                                            SEH62.1U




January 2003   Siemens Building Technologies         RWD heatpump controllers
                                                                                        9
                                                     Xavier Zabalegui/David Jefferson
                                                  RWD44U/45U Digital input options


                            Alarm
                                                                                                     Alarm
                            External shutdown,
                            Flow switch, smoke,
                            Common alarm from heat pump

               A switch contact between X2M or D1GND is
               used to enable the alarm function. When the                                               +

               contact is closed, all Q outputs are off and the                                          -
               alarm icon flashes on the LCD.
               The alarm function overrides all the other auxil-
                                                                                     3346s04
               iary and digital functions.                                                     Q1 Q2 Q3 Q4   D1 X2     X1
               If X2 is used as an alarm function then D1 can
               be set as a day/night, standby or a filter alarm.                      RWD34 & RWD44
                                                                                                                     Temp.




January 2003   Siemens Building Technologies      RWD heatpump controllers
                                                                                                10
                                                  Xavier Zabalegui/David Jefferson
                                               RWD44U/45U Digital input options


                    Filter Alarm
                    Avoid heat pump breakdowns
                    Warning for maintenance personnel to change filter




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                  11
                                               Xavier Zabalegui/David Jefferson
                                                RWD44U/45U Digital input options



                        Day & Night Setpoints
                                                                                          SEH62.1U
                        Keep internal temperatures within acceptable limits during
                        unoccupied periods


               A switch contact between D1-M can be used to
               implement setpoint changeover for day/night
               operation. When contact is open, the setpoints
               for day operation are selected. When contact is
               closed, the setpoints for night operation are
               selected.
               During night operation, the remote setpoint and
               setpoint compensation functions are not appli-
               cable.



January 2003   Siemens Building Technologies     RWD heatpump controllers
                                                                                     12
                                                 Xavier Zabalegui/David Jefferson
                                                                  RWD44U/45U Aux functions
                                 Remote setpoint
               A remote setpoint transmitter or an integrated
               sensor with setpoint (QAA25U), connected to
               X2-M enables remote adjustment.
                                          “Setpoint adjustment should be
                                                 mechanically limited”


                                                                                                                     3346d08
               Heating stage 1 is the remote setpoint and
               the reference setpoint. A shift setpoint (  ) is set
               between the stages.
               The example shown is the remote setpoint                                         H2         C1
               parameters for a 2-stage compressor.
                                                                                                                C2
                                                                                                Remote
                                                                                                Setpoint




January 2003     Siemens Building Technologies               RWD heatpump controllers
                                                                                                     13
                                                             Xavier Zabalegui/David Jefferson
                                                    RWD44U/45U Aux functions


                        Compensation shift

                        Enhanced comfort and                                      X2=   SP=   X2=   SP=

                          energy savings




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                         14
                                               Xavier Zabalegui/David Jefferson
                                                    RWD44U/45U Aux functions



                Sensor averaging

                In some areas the temperature may vary from one
                location to another.
                                                                                  X1        X2




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                       15
                                               Xavier Zabalegui/David Jefferson
                                                    RWD44U/45U Aux functions


                Sensor Select

                Flexible solution for special applications. Typical
                                                                                     X2
                                                                                     X2                       X1
                                                                                                              X1
                example is a general office area with a seldom used
                meeting room.
                                                                                  Office area             Meeting room
                                                                                                     OR




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                                16
                                               Xavier Zabalegui/David Jefferson
                                                            RWD44U/45U Aux functions


                        Winter/Summer setpoint selection
                        (Digital)
ch contact between X2M or D1GND is
                  Heat function. When the
o enable the alarmpumps for 2-pipe systems (return water               +

                  temperature control)                                                         SP = 76°           SP = 72°
 t is closed, all Q outputs are off and the                            -
 con flashes on the LCD.
arm function overrides all the other auxil-
                                                        3346s04
 d digital functions.                                           Q1 Q2 Q3                  Q4    D1 X2       X1
  used as an alarm function then D1 can
 as a day/night, standby or a filter alarm.               RWD34 & RWD44
                                                                                                          Temp.




        January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                                  17
                                                       Xavier Zabalegui/David Jefferson
                                                    RWD44U/45U Aux functions


                Winter/Summer setpoint selection
                (Analog)

                Heat pumps for 2-pipe systems (return water
                temperature control)                                              SP = 72°   SP = 76°




January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                     18
                                               Xavier Zabalegui/David Jefferson
                                                                                RWD45U




                                                                                         „   Standard RWD44U design
                                                                                         „   Same auxiliary functions
                                                                                         „   LCD with monitoring of all inputs/outputs
                                                                                         „   Three universal inputs
                                                                                         „   New OpenAir™ economizer control
                                                                                         „   No need for hi/low limit thermostats
                                       “OpenAir™ economizer”                             „   A single active O/A sensor can be used for a
                                                                                             group of controllers
                                                or
                          “RWD44U+ 2nd independent universal
                                 modulating loop”.

January 2003   Siemens Building Technologies          RWD heatpump controllers
                                                                                                             19
                                                      Xavier Zabalegui/David Jefferson
                                                           RWD Heat pump controllers




                      RWD45U

                              Standard RWD44U format with LCD
                              Button or software tool setting
                              Air to Air / Air to Water Heat-pumps
                              (4) DO’s and (1) AO configurable
                              Suitable for single, dual and triple compressor units
                              Economizer control or 2nd independent (Y) loop
                              New OpenAir™ economizer sequence
                              24vac


January 2003   Siemens Building Technologies         RWD heatpump controllers
                                                                                        20
                                                     Xavier Zabalegui/David Jefferson
                                                                        RWD45U Internal diagram



                                               G         D1 GND X1 M                         X2 M    X3 M           TOOL
                                                                               Q1                   Q2        Q3           Q4
                                                RWD45

                                               G0       Y1 M              14 11              22 24 21    32 34 31        44 41




               D1                                   Digital Input
               G, G0                                AC24V supply
               M                                    Ground (G0) for signal inputs and universal inputs
               Q...                                 Relay outputs, various voltages permissible
               X1                                   Signal input (main input: Ni 1000, Pt 1000 and DC0 …10 V)
               X2                                   Signal input (aux. Input: Ni 1000, Pt 1000, DC0 …10 V and remote setting unit)
               X3                                   Signal input (Eco sensor or 2nd ind. input: Ni1000, Pt1000, DC0…10V)
               Y1                                   Analog output
               Tool                                 Communication port with PC (9-pin plug)


January 2003   Siemens Building Technologies                    RWD heatpump controllers
                                                                                                                    21
                                                                Xavier Zabalegui/David Jefferson
                                                   RWD45U - OpenAir™ economizer control

                                               Remember the days when you could just open a window?


                  Why use cooling energy when the outside air temperature is suitable for cooling?
                  The OpenAir™ economizer feature simply shifts the 1st cooling stage and replaces it with a 0 -
                  10vdc cooling output. This occurs only when cooling is required and the outside temperature is
                  suitable.



                  Introduce outside air via damper actuators.
                  Economizer control is not a new innovation, however the RWD45U
                  OpenAir™ solution is an easily implemented and understood concept.
                  “Affordable”


January 2003   Siemens Building Technologies          RWD heatpump controllers
                                                                                            22
                                                      Xavier Zabalegui/David Jefferson
                                                RWD45U - OpenAir™ economizer control


                                                       Normal Mode (Economy mode inactiv e)
                      Eco Parameters                                             SD_H2    SD_H1    SD_C1        SD_C2
                      Min X3 limit                                                                                       ON
                                                                                   Q1      Q2        Q3          Q4
                      Max X3 limit
                      Eco - Xp                                                                                          OFF
                                                                              SP_H2      SP_H1     SP_C1        SP_C2                     Q
                      Y min                                                                                                     3347d01

                                                       Economy Mode                                  Xp
                      Y max                    10V                                                             Ymax
                                                                                                     Y1
                                                                                                                                    ON
                                                                                   Q1      Q2                  Q3        Q4

                                               0V                                                                                 OFF
                                                                                                  Ymin
                                                                              SP_H2      SP_H1                SP_C1     SP_C2             Q


                          Economy mode is active only when cooling is required and the X2 temperature is within the
                                                      maximum and minimum limits.

January 2003   Siemens Building Technologies         RWD heatpump controllers
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                                                     Xavier Zabalegui/David Jefferson
                                                      RWD45U - OpenAir™ economizer control


               Main benefits
               Improved air quality
               Reduced compressor running time
               Reduced wear on compressor, condenser fan etc
               Reduce installation costs:
               1. Additional outside air limit thermostats not required
               2. A single active outside air sensor could be used for multiple controllers
               Reduced energy consumption - Save

                                          We can offer our customers a complete package


January 2003    Siemens Building Technologies            RWD heatpump controllers
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                                                         Xavier Zabalegui/David Jefferson
                                                               Two-stage heating and cooling

                             AC 24V                                                            AC 24V
                                                                                                                                 3347g03
                                                                                               (L)

                                                    G                                   G
                                                    B M                                 B M

                                               S1          X1                  X2             X3

                                G      D1 GND X1 M               X2 M                 X3 M               11       21       31    41

                                               RWD45                                          Q
                                G0                  TOOL                 Y1       M                       14 22    24 32    34     44



                                               PC
                                                                                         Y1               H2       H1       C1     C2


                                               ,
                                                                                                   G0
                                     G0
                                                                                                   (N)

January 2003   Siemens Building Technologies               RWD heatpump controllers
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                                                           Xavier Zabalegui/David Jefferson
                                                    Three stage (CR)compressor - (RV)reversing valve


                           AC 24V                                                                  AC 24V
                                                                                                                                     3347g02
                                                                                                   (L)

                                                    G                                 G
                                                    B M                               B       M

                                               S1          X1                X2                   X3

                              G      D1 GND X1 M                X2 M                X3 M                     11       21       31    41

                                               RWD45                                              Q
                              G0                    TOOL               Y1       M                             14 22    24 32    34     44



                                               PC
                                                                                       Y1                     RV      CR1      CR2    CR3


                                               ,
                                                                                                       G0
                                   G0
                                                                                                       (N)

January 2003   Siemens Building Technologies               RWD heatpump controllers
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                                                           Xavier Zabalegui/David Jefferson
                                                      RWD45U - Special applications (example)


                    Packaged water heat pump including supply water control valve via
                    2nd independent loop
                    X1 controls primary heat pump water temp with X3 controlling the
                    supply water temp to the coils
                                                                                                                     Water system

                                                                                              Y1
                                                                                                            Pump    Floor Coil

                                               HP                                                  T
                                                                                                       X3

                                               *
                                                                    Pump
                                                    X1 T


                                                                             Y1 X3
                                                    RWD45


January 2003   Siemens Building Technologies               RWD heatpump controllers
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                                                           Xavier Zabalegui/David Jefferson
                                                    RWD45U - Special applications (example)

                  Rooftop or split heat pump including air quality control via 2nd
                  independent loop
                  X1 controls heat pump room temp with X3 controlling the
                  CO2/VOC level within room
                                                                                                                  Air / AQ
                                               DM
                                                                                               X3
                                                                                               AQ


                                               DM


                                                                                               X1
                                                                                               T
                                               DM




                                                                               *                         AQ processor
                                                     PAC




                                                                    Y1                    X3
                                                                           RWD45


January 2003   Siemens Building Technologies           RWD heatpump controllers
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                                                       Xavier Zabalegui/David Jefferson
                                                 RWD45U - Special applications (example)

                    Rooftop or split heat pump including humidifier control via 2nd
                    independent loop
                    X1 controls heat pump room temp with X3 controlling the
                    humidifier output to room
                                                                                                       Air / humidity
                                                                                             X3
                                                                                             H




                                                                                             X1
                                                                                             T

                                                                                    V   Y1

                                                                     *
                                               PAC




                                                                            Y1     X3
                                                                 RWD45


January 2003   Siemens Building Technologies         RWD heatpump controllers
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                                                     Xavier Zabalegui/David Jefferson
                                                     RWD45U - Special applications (example)

                  Stage control of heat pump including remote monitoring of X1
                  temperature
                  X1 controls heat pump room temp with Y1 supplying the
                  equivalent signal in 0-10vdc format. Could also control remote SP
                  and stop/start                                                                           Air or Water

                                                                                           Y1




                                                                                                          Remote display
                                                                                           X1
                                                                                           T
                                                                                                               DDC
                                                               *                                                PLC
                                               PAC

                                                                                                           Alarm system
                                                                        X1 Y1                        Input to another controller
                                                           RWD45



January 2003   Siemens Building Technologies            RWD heatpump controllers
                                                                                                30
                                                        Xavier Zabalegui/David Jefferson
                                                RWD for commercial applications


               RWD must be recommended for commercial applications




                 Protection against unauthorized adjustment, equipment damage and
                nuisance service calls.

                 Optimum comfort and energy savings

                 MMI should not be available for occupants

                 Fan speed control should only be applied to residential or small room
                applications


January 2003   Siemens Building Technologies   RWD heatpump controllers
                                                                                    31
                                               Xavier Zabalegui/David Jefferson
                                                         RWD heat pump controllers

                                                                                      Inside a typical heat pump




                                               Rooftop packaged unit                                   Indoor packaged unit


January 2003   Siemens Building Technologies       RWD heatpump controllers
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                                                   Xavier Zabalegui/David Jefferson