1. Central Processing Unit 0500 with ECO
Mixing  Boiler Staging  Setpoint  Differential Setpoint  Geothermal

2. HBX Controls Head Office, Calgary Alberta
Company Information
HBX Control Systems Inc. Comfort, Control, Innovation
 Privately owned company  Incorporated and manufactured in Calgary, Alberta, Canada  Ease of installation and commissioning are the cornerstones of the HBX design concept.  Simple to wire and easy to program hydronic control ` solutions th Ave SE Calgary, Alberta, Canada T2C 2K2
HBX Controls Head Office, Calgary Alberta

3. CPU-0500
The CPU-0500 is a standalone Outdoor Reset Control capable of operating in one of the following selectable modes:
Boiler Staging  The CPU-0500 operating as a Boiler Control is capable of staging up to two On/Off boilers, or a single modulating boiler with DHW requirements.
Mixing  As a Mixing Control, the CPU-0500 has the capability to run a single On/Off or modulating boiler. Mixing types include modulating mixing, PMIp or floating action.
Setpoint Control  The CPU-0500, when selected as a Setpoint Control, will allow for Dual or Differential Setpoint applications to be managed. A high temperature dump contactor is available for solar thermal applications.
Geothermal Control  In ECO mode, the CPU-0500 manages applications using heat pumps, chillers, or compressors. It can handle reversing valves, 2 stages (2 stages of heat pump, or 1 stage with backup), separate hot and cold tanks, or a single buffer tank.

4. CPU-0500 Specifications
3 x Sensor Inputs 10K Ohm Thermistor 2 x Input Signal Heating / Cooling or DHW Demands 2 x Relay Outputs Dry contacts (240VAC, 10 Amps) 1x Modulating Output / Relay 1-10VDC or 4-20mA / 2 A dry contact Dimensions 100mm (W) x 168mm (H) x 70mm (D) Weight 0.408KG ETL Listings Meets CSA C22.2 No.24 Meets UL Standard 873 ETL Control No

5. Easy to use fully Integrated Single Dial Control
Multi-function Control
Easy to use fully Integrated Single Dial Control
Multi-Colour Backlit Display
Blue  Heat Demand ON and Boiler Satisfied (ECO Cool Mode)
White  No Heat demand
Red  Demand (DHW or HD) & Boiler Running (ECO Heat Mode)
Yellow  Heat demand ON / Boiler Protection Mode
Green  Demand ON/ No Heat Pumps Running

6. Single Dial Operation
The CPU-0500 features an intuitive, easy to use dial for programming and scrolling through status information. To access the different status screens, simply turn the dial to the left or right. The status screen is the default screen for the CPU To enter programming scroll mode, gently push the dial in momentarily, and turn the dial to the left or right to access the different programming menus. To enter programming change mode, press the dial in again and rotate the dial to the desired setting or value. A small triangle appears in the top left corner when in this mode. If the control is left idle in programming (Set) mode the control will automatically return to the Status mode.

7. CPU-0500 On Screen Display Control Mode Screens
Boiler Control Mode
Stage up to 2 off/on boilers
Control a modulating boiler
Control Mode Screens
After the software version screen is shown the mode screens can be accessed. By turning the knob, the user may select the desired type of control mode for the CPU To change the type of control mode later on, the controller must be powered down and restarted.
Setpoint Control Mode
Control 2 separate heat/cool setpoints
Individual differentials
Software Version Screen
The first screen that is shown on the display screen when the CPU-0500 is initially powered-up is the software version screen. The most current version on the CPU-0500 is version 2.10
Differential Setpoint Control Mode
Control solar applications
∆T based modulating pump signal
Mixing Control Mode
Control injection pump and boiler pump
Control floating action / modulating valve
ECO Control Mode
Control heatpumps and chillers
Automatically operates reversing valve

8. CPU-0500 Status Screens Status Screens Status Screen
Boiler Temperature
This is the temperature reading from the boiler sensor
DHW Temperature
This is the temperature reading from the DHW sensor (boiler mode only)
Status Screens
The status screens for boiler and mixing mode are shown to the right. Status screens will differ depending upon the control mode selected. To cycle through the different status screens, simply turn the control dial.
Status Screen
The CPU-0500 operates in either ‘Status’ or ‘Programming’ mode. The status screen will display various sensor readings and setpoints (targets). Some of the targets are predefined by the user, while others are automatically determined by a reset curve.
Low Temp System Temperature
Temperature of low temp system (mixing mode only)
Boiler Target
Boiler setpoint as defined by reset curve parameters
DHW Target
Setpoint for DHW tank (this is a fixed setpoint not affected by the reset curve)
Outdoor Temperature
Outdoor temperature as read by outdoor sensor (required for reset curve)

9. CPU-0500 Programming Screens
Design Boiler Temperature
This is the maximum setting for the boiler, as recommended by the boiler manufacturer and is used for the reset curve calculation
Programming Screen
The programming screen is where the user inputs the relevant information and settings, such as DHW target, differential and outdoor reset parameters, when applicable.
Design Low Temperature System Temperature
This is the design low temperature system setting (mixing mode only) and is used for the reset curve for the low temperature system
Design Room Temperature
Approximate desired room temperature, this is required for the reset curve calculation

10. CPU-0500 Programming Screens
Design Outdoor Temperature
Set this to the outdoor temp at which you would like to hit your max boiler temperature. To override the heat curve, set this to the highest possible value
Programming Screen
The programming screen is where the user inputs the relevant information and settings, such as DHW target, differential and outdoor reset parameters, when applicable.
Minimum Boiler Temp
This setting prevents mixing from occurring before the boiler loop is up to temperature, as defined by the user
Minimum Low Temp System Temperature
This setting is for the desired minimum temperature for the low temperature system, to override the reset curve, set equal to the design low temp system temperature

11. Outdoor Reset Parameters
CPU-0500 Reset Curve Parameters
Outdoor Reset Parameters
The CPU-0500 is an outdoor reset control; the control parameters entered by the user are used to create a reset curve so that the boiler target decreases as the outdoor temperature increases. This is an important energy saving feature for boiler installations. When in mixing mode, the CPU-0500 will operate the high and low temperature systems on separate reset curves. An example of a reset curve is shown below for a high and low temperature system.

12. CPU-0500 Staging Theory
The staging method utilized by the CPU-0500 is load based, and determined by the relationship between actual temperature, target temperature and differential. For all HBX controls, the differential is half above and half below the target – a differential of 10°F would be 5°F above the target and 5°F below.
Actual Temperature
1st Stage Off
2nd Stage Off
Differential
Target
Temperature
2nd Stage On
1st Stage On

13. Example Applications: Single Stage Boiler w/out DHW
This example application shows a single stage boiler being used to provide heat for a heat load, without DHW. The CPU-0500 controls the boiler pump and will adjust the boiler target based on the outdoor temperature (outdoor reset).

14. (pages 11-13 of installation manual)
Example Applications: Single Stage Boiler w/out DHW
Important Programming Parameters
(pages of installation manual)
Boiler Selection
This setting is used to identify the type and number of boilers connected to the CPU For a single stage on/off, select ‘1’. This is the default setting for the CPU-0500.
Design Outdoor Temperature
Set this to the outdoor temp at which you would like to hit your max boiler temperature. To override the heat curve, set this to the highest possible value. The default value is shown .
Minimum Boiler Temp
This setting prevents mixing from occurring before the boiler loop is up to temperature, as defined by the user
Design Boiler Temperature
This is the maximum setting for the boiler, as recommended by the boiler manufacturer and is used for the reset curve calculation

15. Example Applications: Boiler w/ DHW Priority
This example application shows a parallel DHW setup, where the DHW pump is capable of drawing water through the boiler. This application requires the boiler pump to be shut down whenever there is a domestic demand. As can be seen below, the CPU-0500 controls both boiler and domestic pumps.

16. (pages 11-13 of installation manual)
Example Applications: Boiler w/ DHW Priority
Important Programming Parameters
(pages of installation manual)
Boiler Selection
This setting is used to identify the type of boilers connected to the CPU For a modulating boiler, select ‘MOD’.
DHW Priority
Set to ‘ON’ for this application type. The priority time is 60 minutes or until the demand is satisfied. This setting is off by default.
Celsius & Fahrenheit
Use this setting to change the display from ° Celsius to ° Fahrenheit. The default temperature displayed is ° Fahrenheit.
DHW Boiler Setpoint
This setting is used to setup the desired boiler setpoint when there is a DHW demand. The default setting is 180°F.

17. Example Applications: Boiler w/ DHW
For DHW and heating applications involving closely spaced tee’s off of a primary boiler circuit, the boiler pump is required to run whenever there is a boiler demand, and the appropriate demand pump must also be energized.

18. (pages 11-13 of installation manual)
Example Applications: Boiler w/ DHW
Important Programming Parameters
(pages of installation manual)
Boiler Selection
This setting is used to identify the type of boilers connected to the CPU For a 2 stage boiler set to ‘2’ for no rotation.
Warm Weather Shut Down (WWSD)
This setting is used to set the outdoor temperature at which CPU-0500 will go into WWSD. Above this temperature the system will shut off and ignore heating demands.
Heat Demand
Set to ‘ON’ to put a permanent heat demand on the CPU-0500, this may be done instead of using a thermostat. The default setting is off.
DHW Differential
This setting is used to set the Differential for the DHW tank. A 6 differential is 3 above and 3 below the DHW target.

19. Example Applications: Staging 2 On/ Off Boilers
The CPU-0500 will stage boilers based on time delay and load factors. Boiler rotation is also possible when two single stage boilers are connected to the CPU-0500, this feature allows for equal run time of the connected boilers.

20. (pages 11-13 of installation manual)
Example Applications: Staging 2 On/ Off Boilers
Important Programming Parameters
(pages of installation manual)
Boiler Selection
This setting is used to identify the type of boilers connected to the CPU For 2 on/ off boilers set to ‘2RT’ if rotation is desired, otherwise set to ‘2’ for no rotation.
Boiler Minimum Stage Lag Time
When the boiler is set for two stages this setting will determine the minimum lag time between boiler stages.
Boiler Differential
This setting is for the differential for the boiler. A 20°F differential would be 10°F above and 10°F below the target.
Boiler Pump Selection
This setting is used to setup the boiler pump contact, when set to ‘On’, the boiler pump will come on when the boiler is enabled, otherwise it will come on with the demand signal.

21. Modulation Output Pointers
When the modulating output signal is enabled, a 4-20mA or 1-10VDC (use dipswitch on back) signal is used to control the connected device, such as a modulating boiler, a VFD or a modulating valve.
In boiler staging mode, these options are only applicable when configuring a modulating boiler and ‘MOd’ has been selected as the boiler type in the boiler selection menu.
Minimum Modulation Percentage
This setting is used to set the lowest modulation level the boiler or device can go down to. This can also be used to set the minimum positions on valves.
Modulating Step Time & Staging Lag Time
This setting is used to set the desired time (in seconds) between steps when the boiler (needs to increase or decrease firing. For example, if a 20% increase (or decrease) is needed over 1 minute; 1 min = 60 s 60 s / 20% = 3 s/% is the time needed between steps to obtain the desired rate

22. Example Applications: Injection Mixing
For applications involving injection mixing, the CPU-0500 will operate an injection pump in PMIp mode and run the low temp system pump . For this type of application, the boiler usually controls it’s own pump.

23. (pages 8-10 of installation manual)
Example Applications: Injection Mixing
Important Programming Parameters
(pages 8-10 of installation manual)
Boiler Selection
This setting is used to identify the type of boiler connected to the CPU For a modulating boiler, set to ‘MOd.’.
Minimum Modulation Percentage
This setting is used to set the minimum modulation level that the connected device (VFD, valve, etc.) can go down to. It can be used to set the minimum positions on valves.
Mixing Modulating Mode
This setting is used to determine the minimum time between stepping up or down in modulating mode.
Mixing Type
This setting is used to select your mixing type. Set to ‘In’ when using a PMIp injection pump as shown in the previous slide.

24. Example Applications: Floating Action Valve Mixing
The CPU-0500 can operate a floating action mixing valve for mixing purposes. The low temperature system pump can be enabled with the boiler pump by using a relay, or can be setup to energize with the demand signal, as shown below. The low and high temperature systems will operate on separate reset curves.

25. (pages 8-10 of installation manual)
Example Applications: Floating Action Valve Mixing
Important Programming Parameters
(pages 8-10 of installation manual)
Boiler Selection
This setting is used to identify the type of boiler connected to the CPU For a modulating boiler, set to ‘Mod.’.
Minimum Modulation Percentage
This setting is used to set the minimum modulation level that the connected device (VFD, valve, etc.) can go down to. It can be used to set the minimum positions on valves.
Mixing Modulating Mode
This setting is used to determine the minimum time between stepping up or down in modulating mode.
Mixing Type
This setting is used to select your mixing type. Set to ‘FL’ when using a floating action (power open / power close) valve as shown in the previous slide.

26. Example Applications: Dual Setpoints
The CPU-0500 is capable of operating separate contactors for two different setpoints when operating in setpoint mode. Each setpoint has it’s own differential and can be either a heating or cooling setpoint. The setpoint contacts are dry contactors.

27. (pages 14-15 of installation manual)
Example Applications: Dual Setpoints
Important Programming Parameters
(pages of installation manual)
Setpoint Temperature
This setting is used to set the desired temperature for each setpoint.
Setpoint Differential
This setting is used to set the differential for each setpoint. A 10°F differential would be 5°F above and °F below the setpoint.
Setpoint Lagtime
This setting is used to set a lag time for each setpoint relay and allows for a minimum off time to be setup. This can be used to prevent short cycling of the connected device.
Heating / Cooling Setpoint
This setting is used to configure each setpoint as a heating or cooling setpoint.

28. Example Applications: Delta T Pumping
In the example application shown below, the CPU-0500 will maintain a user defined constant temperature differential across a heating load by sending a modulating signal to a pump or VFD. This allows the CPU-0500 to operate as a Delta T pump control.

29. (pages 15-16 of installation manual)
Example Applications: Delta T Pumping
Important Programming Parameters
(pages of installation manual)
Setpoint Differential
This setting is used to set the differential between the two temperature sensors.
Setpoint Lagtime
This setting is used to set a lag time for relay #1, and allows for a minimum off time to be setup. This can be used to prevent short cycling of the main circulation pump.
Minimum Modulation Percentage
This setting is used to set the minimum modulation level that the connected device (VFD, valve, etc.) can go down to. It can be used to set the minimum positions on valves.
Mixing Modulating Mode
This setting is used to determine the minimum time between stepping up or down in modulating mode.

30. Example Applications: Solar Thermal
The CPU-0500 is capable of controlling solar thermal applications, or any other type of application requiring a contactor to close when there is a temperature difference detected. The high temp contact will close when the user defined high temperature has been reached in the primary storage tank, allowing flow to be diverted to another storage tank or a thermal dump.

31. (pages 15-16 of installation manual)
Example Applications: Solar Thermal
Important Programming Parameters
(pages of installation manual)
Setpoint Differential
This setting is used to set the differential between solar storage tank and the solar collector. When the difference exceeds this , relay #1 will engage.
Setpoint Lagtime
This setting is used to set a lag time for relay #1, and allows for a minimum off time to be setup. This can be used to prevent short cycling of the main circulation pump.
Heating / Cooling Setpoint
This setting is used to configure the setpoint as a heating or cooling setpoint. This should be set to ‘on’ for solar applications, such as the one shown in the previous slide.
High Temperature Dump
This setting is used to determine the temperature that the high temperature contact (relay #2) enages.

32. Example Applications: Geothermal - Single Tank
The CPU-0500 is capable of controlling single tank heatpump/chiller applications. The controller operates the reversing valve and maintains the tank at a hot or cold temperature based on the demand signal from a connected thermostat. The outdoor sensor allows the tank temperature to be maintained at a target temperature as prescribed by a reset curve.

33. (pages 16-18 of installation manual)
Example Applications: Geothermal - Single Tank
Important Programming Parameters
(pages of installation manual)
System Temperatures 1 and 2
These settings are used for setting the desired heating and cooling targets. When there is no thermistor connected to terminals 7 and 9, the control assumes single tank operation.
Heating / Cooling Differentials
These settings are used to set the heating and cooling differentials. The heating and cooling differentials can be different values.
Cold / Warm Weather Shutdown
This setting is used to set the minimum and maximum outdoor temperatures that cooling and heating demands will be acknowledged by the control. It is important that the CWSD temperature is greater than the WWSD for single tank applictions.
Use Backup Temperature
If a backup (stage 2) is used this can either be configured to come on based on outdoor temperature or time delay. When set to ‘OFF’ it is based on time delay.

34. Example Applications: Geothermal – 2 Tank
The CPU-0500 is capable of controlling 2 tank heatpump applications. In this example application, a two position valve is actuated with the reversing valve to divert flow to the cold tank when in cooling mode. By using the outdoor sensor, not only will the reset curve be used, but the cold and warm weather shut down feature may be utilized as well. The extra sensor installed on terminals 7 & 9 is how the CPU-0500 determines that it is controlling a 2 tank system.

35. (pages 16-18 of installation manual)
Example Applications: Geothermal – 2 Tank
Important Programming Parameters
(pages of installation manual)
Design Outdoor Temperature
This setting is used for a reset curve calculation for the hot tank. The hot tank target will then vary with outdoor temperature. Set to ‘Off’ to disable this feature.
Heating or Cooling Priority
This setting tells the control what to do in the event of simultaneous heating and cooling demands. This may happen when both hot and cold tanks are off targets, or multiple demand signals are applied.
Minimum Lag Time
This setting is used to set the minimum lag time between stages for multiple stage applications.
Stage Selection
This setting is used to identify the number of stages connected to the CPU For a 2 stage heat pump, select ‘2’.

36. Example Applications: Geo – CPU-0500 to THM-0200
The demand input signal is very important for single tank applications as the CPU-0500 needs to know when the tank needs to be hot and when it needs to be cold. When there is no demand signal applied to the control, the heat pump will not try and maintain a setpoint, which is an important energy saving feature.

37. Cross References
* The above system requirements may vary depending on specific installations

38. End of Slideshow
Questions?
Thank – You!