RWD heatpump controllers

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RWD Heat Pump controllers
RWD Heat Pump Controllers
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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 competitors controllers
  (T775, A350)
• Increase RWD range
• RWD suitable for commercial applications

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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

Standard model
Our standard solution for commercial heat
pumps. Easy and flexible settings
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RWD Heat pump controllers
Standard model

• 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

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RWD44U Internal diagram
Removable terminals are also labeled. Disconnect
when commissioning
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Two-stage heating and cooling
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Three stage (CR)compressor - (RV)reversing valve
S1 D/N C/O X1 main sensor X2 Remote setpoint
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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
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RWD44U/45U Digital input options
Standby (on/off)
SEH62.1U
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RWD44U/45U Digital input options
Alarm External shutdown, Flow switch,
smoke, Common alarm from heat pump
Alarm
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RWD44U/45U Digital input options
Filter Alarm Avoid heat pump breakdowns Warning
for maintenance personnel to change filter
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RWD44U/45U Digital input options
Day Night Setpoints Keep internal temperatures
within acceptable limits during unoccupied periods
SEH62.1U
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RWD44U/45U Aux functions
Remote setpoint
Setpoint adjustment should be mechanically
limited
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RWD44U/45U Aux functions
Compensation shift Enhanced comfort and energy
savings
X2
SP?
X2
SP?
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RWD44U/45U Aux functions
Sensor averaging In some areas the temperature
may vary from one location to another.
X1
X2
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RWD44U/45U Aux functions
Sensor Select Flexible solution for special
applications. Typical example is a general office
area with a seldom used meeting room.
X1
X2
X1
X2
Office area
Meeting room
OR
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RWD44U/45U Aux functions
Winter/Summer setpoint selection (Digital) Heat
pumps for 2-pipe systems (return water
temperature control)
SP 76
SP 72
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RWD44U/45U Aux functions
Winter/Summer setpoint selection (Analog) Heat
pumps for 2-pipe systems (return water
temperature control)
SP 72
SP 76
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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

Economizer model
OpenAir economizer or RWD44U 2nd
independent universal modulating loop.
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RWD Heat pump controllers
Economizer model

• RWD45U
• Standard RWD44U format with LCD
• Button or software tool setting
• Air to Air / Air to Water Heat-pumps
• (4) DOs and (1) AO configurable
• Suitable for single, dual and triple compressor
  units
• Economizer control or 2nd independent (Y) loop
• New OpenAir economizer sequence
• 24vac

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RWD45U Internal diagram
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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
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RWD45U - OpenAir economizer control
Eco Parameters Min X3 limit Max X3 limit Eco -
Xp Y min Y max
Economy mode is active only when cooling is
required and the X2 temperature is within the
maximum and minimum limits.
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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
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Two-stage heating and cooling
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Three stage (CR)compressor - (RV)reversing valve
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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
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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
AQ processor
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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
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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
Remote display DDC PLC Alarm system Input to
another controller
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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

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RWD heat pump controllers
Thank you !
Inside a typical heat pump
Rooftop packaged unit
Indoor packaged unit