Siemens Building TechnologiesRWD heatpump controllers Xavier Zabalegui/David Jefferson 1 January...

RWD heatpump controllersXavier Zabalegui/David Jefferson

1January 2003

Siemens Building Technologies

RWD Heat Pump controllers

RWD Heat Pump Controllers


2January 2003


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


3January 2003


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• Usable defaults

Our standard solution Our standard solution for commercial heat for commercial heat pumps.pumps.

Easy and flexible Easy and flexible settingssettings


4January 2003


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


5January 2003


RWD44U Internal diagram

“Removable terminals are also

labeled. Disconnect when

commissioning”

G D1 GND X1 M X2 M

G0 14 11 22 24 21 32 34 31 44 41

TOOL

RWD44Q1 Q2 Q3 Q4


6January 2003


Two-stage heating and cooling


7January 2003


Three stage (CR)compressor - (RV)reversing valve

S1= D/N C/O

X1= main sensor

X2= Remote setpoint


8January 2003


RWD44U/45U Aux Functions & Digital Input options

Auxiliary Functions

Remote setpoint

Compensation shift

Two sensor averaging

Winter/summer setpoint selection

Sensor select

Active input

Digital input options

Standby (on/off)

Alarm

Filter alarm

Day/night setpoints

# Refer to application chart for

combinations


9January 2003


RWD44U/45U Digital input options

Standby (on/off)

SEH62.1U


10January 2003



Alarm

External shutdown,

Flow switch, smoke,

Common alarm from heat pump

AlarmAlarm


11January 2003



Filter Alarm

Avoid heat pump breakdowns

Warning for maintenance personnel to change filter


12January 2003



Day & Night Setpoints

Keep internal temperatures within acceptable limits during unoccupied periods

SEH62.1U


13January 2003


RWD44U/45U Aux functions

“Setpoint adjustment should be

mechanically limited”

Remote setpoint


14January 2003



Compensation shift

Enhanced comfort and

energy savings

X2= SP= X2= SP=


15January 2003



Sensor averaging

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

X1 X2


16January 2003



Sensor Select

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

OR

X2 X1 X2 X1


17January 2003



Winter/Summer setpoint selection

(Digital)

Heat pumps for 2-pipe systems (return water temperature control)

SP = 76° SP = 72°


18January 2003



Winter/Summer setpoint selection

(Analog)

Heat pumps for 2-pipe systems (return water temperature control)

SP = 72° SP = 76°


19January 2003


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• A single active O/A sensor can be used for a

group of controllers

““OpenAir™ economizer”OpenAir™ economizer”

oror

“ “RWD44U+ 2nd RWD44U+ 2nd independent universal independent universal

modulating loop”.modulating loop”.


20January 2003


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


21January 2003


RWD45U Internal diagram

G D1 GND X1 M X2 M

G0 14 11 22 24 21 32 34 31 44 41

X3 M TOOL

Y1 M

RWD45Q2 Q3 Q4Q1


22January 2003


RWD45U - OpenAir™ economizer control

Remember the days when you could just open a Remember the days when you could just open a window?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. “AffordableAffordable””


23January 2003


RWD45U - OpenAir™ economizer control

SP_C1 SP_C2SP_H2

Q3 Q4Q2Q1

SP_H1 Q

SP_C1 SP_C2

Q3 Q4Q2

SP_H1 Q0 V

10V

Normal Mode (Economy mode inactive)

Economy Mode Ymax

YminSP_H2

Q1

Xp

Y1

ON

OFF

ON

OFF

SD_C2SD_C1SD_H1SD_H2

3347d01

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

minimum limits.

Eco Parameters

Min X3 limit

Max X3 limit

Eco - Xp

Y min

Y max


24January 2003


RWD45U - OpenAir™ economizer controlMain 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 We can offer our customers a complete packagepackage


25January 2003


Two-stage heating and cooling

RWD45

MD1

G0

G X2GND

AC 24V

X1 X2S1

G0

X1 M MX3

X3

TOOL Y1 M

,

C1

AC 24V

(N)

G0

11 21 31 41

14 22 24 32 34 44

Q

H2 H1 C2

PC

(L)

Y1

3347g03

B MMB B MMBGG


26January 2003


Three stage (CR)compressor - (RV)reversing valve

RWD45

B M

MD1

G0

G X2GND

AC 24V

X1 X2S1

G0

X1 M MX3

X3

TOOL Y1 M

,

CR2

AC 24V

(N)

G0

11 21 31 41

14 22 24 32 34 44

Q

RV CR1 CR3

PC

(L)

Y1

3347g02

MGB B M

G


27January 2003


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


28January 2003



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

AQ processor


29January 2003



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


30January 2003



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

Remote display

DDC

PLC

Alarm system

Input to another

controller

Air or Water


31January 2003


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


32January 2003


RWD heat pump controllers

Inside a typical heat pump

Rooftop packaged unit Indoor packaged unit

Siemens Building TechnologiesRWD heatpump controllers Xavier Zabalegui/David Jefferson 1 January...

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