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Taco iWorx MPU2, Application Manual

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Taco iWorx MPU2 Application Manual Download Page 23

iWorx® MPU2

505-009, Effective: April 28, 2014

23 

© 2014 Taco Electronic Solutions, Inc.

Figure 9: Modulated Staging with 2 Stages; 2nd Stage Modulating

Figure 10: Modulated Staging with 2 Stages; 1st Stage Modulating

Summary of Contents for iWorx MPU2

Page 1: ...ion 8 Connecting Input Devices 10 Connecting Output Devices 11 Other Connections 12 Specifications 13 Electrical 13 Mechanical 14 Application Description 15 Sequence of Operation 18 Operational Mode 18 Occupancy Mode 19 Setpoint Calculations 19 Supply Air Setpoint Reset Curve 19 Heating Sequence 20 Cooling Sequence 24 Economizer Operation 27 Cutoff Temperatures 28 Dehumidification 29 Bypass Damper...

Page 2: ...iWorx MPU2 2 505 009 2 Effective April 28 2014 2014 Taco Electronic Solutions Inc THIS PAGE LEFT BLANK INTENTIONALLY ...

Page 3: ...oring and control applications Features Four stages of cooling or a floating point control valve or a modulated output valve or variable speed circulator Two stages of heating or a floating point control valve or a modulated output valve or variable speed circulator Modulated bypass damper Digital or modulated economizer Economizer enabled based on enthalpy calculations or dry bulb Minimum cycle t...

Page 4: ...cident disaster neglect misuse misapplication inade quate operating environment repair attempted repair modification or alteration or other abuse For further informa tion please refer to the last page of this Document for the company s Limited Warranty Statement which is also issued with the product or available at www taco hvac com APPLICABLE DOCUMENTATION Table 1 Applicable Documentation Descrip...

Page 5: ...al device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference This equip ment can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a par ticular installation ...

Page 6: ...4 Volts AC To calculate power source current requirements add the power consumption of all peripheral devices to that of the controller The controller and sensor power supplies can use the same power source If both are using the same power source the loads must have EMF protection This protection can be integral to the load or installed in the 24 VAC wiring across the load s coil To provide necess...

Page 7: ...e control enclosure and wiring conduit Grounding the Device The ground terminal T40 must be securely connected to earth ground Failure to properly ground this equipment will result in improper operation Improper grounding may also increase the risk of electrical shock and may increase the possibility of interference with radio TV reception For best performance connect the power supply common termi...

Page 8: ...ons Inc WIRING INFORMATION WARNING Terminals 6 9 12 15 18 and 38 are connected internally on all MPU2 controllers Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment damage Figure 2 Typical MPU2 Wiring Example A ...

Page 9: ...iWorx MPU2 505 009 Effective April 28 2014 9 2014 Taco Electronic Solutions Inc Figure 3 Typical MPU2 Wiring Example B ...

Page 10: ...dity RAH To connect the Return Air Humidity sensor to the unit connect the positive wire from the sensor to RAH T19 and the other wire to the adjacent common T18 The sensor must be of the 0 10 Volt type If global indoor air humidity readings are being provided over the network it is not necessary to attach a return air humidity sensor directly to the MPU2 ...

Page 11: ...the digital CO2 level sensor to the unit attach one wire from the sensor to IAQ T10 and the other wire to the adjacent common T9 The sensor must provide a contact closure when the CO2 limit is exceeded For a digital sensor this must be a dry contact normally open switch For an analog sensor it must be of the 0 10V type Static Pressure SPR To connect the static pressure transducer to the analog inp...

Page 12: ...C4 The cooling stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp See preceding figures for details If the load is less than 1 Amp connect to C4 T26 and TC34 T27 Heating Stage 1 or Heating Floating Point Valve Open H1 The heating stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp See preceding figures for details If the lo...

Page 13: ...ir 18 AWG recommended 500 feet max 152 meters Resolution 10 bit Mixed Air Low Limit Filter Status Smoke Detect Local IAQ Alarm Dry Contact Normally Open 5 Volts DC Max Fan Proof Dry Contact Normally Closed Return Air Humidity Static Pressure 0 10 Volts DC Mixed Air Temperature Supply Air Temperature Return Air Temperature Precon Type III 10K thermistor Outputs Fan Start Stop Heating Stage 1 Heatin...

Page 14: ...166 mm wide 1 75 deep 44 mm ABS Weight Controller Weight 0 70 pounds 0 32 kilograms Shipping Weight 1 0 pounds 0 46 kilograms Electronics Processor 3150 Neuron 10 MHz Flash 48 Kilobytes SRAM 8 Kilobytes Termination 0 197 5 0 mm Pluggable Terminal Blocks 14 22 AWG Environmental Temperature 32 F to 140 F 0 C to 60 C Humidity 0 to 90 non condensing Agency Listings UL Listed for US and Canada Energy M...

Page 15: ... stopping of the supply air fan is controlled by the MPU2 The fan is energized when the there is a call for heating or cooling from the Zone Controllers During the occupied periods the fan can be configured to run continu ously The enthalpies of the outside and inside air are calculated periodically A comparison is performed to determine if free cooling is available If free cooling is available th...

Page 16: ...sual If the condition has not been cleared after a programmable delay an alarm is sent to the LCI The MPU2 scans all associated Zone Controllers to collect system demand data The total heating and cooling demands are accumulated The greatest demand determines the control mode When the system cooling demand is greater than the system heating demand the system enters the cooling mode When the system...

Page 17: ... after a pre deter mined time period the heating stages shut down and a heating failed alarm is reported to the LCI As a safety device the controller can optionally monitor the supply air temperature to determine if the heating stages have failed on If the supply air temperature rises above the heating high limit setpoint the fan energizes If the supply air temperature does not drop below the setp...

Page 18: ... primary off indicating no heating or cooling is being provided When there is neither heating nor cooling but the supply fan is on the opera tional mode is set to primary fan only The heating mode can be disabled during warm weather by setting the outdoor air temperature heating lockout Max OAT Heat If the OAT is above the heating lockout temperature the primary heating mode is disabled and the MP...

Page 19: ...value based on the current operating mode The effective setpoint is set to the heating setpoint when the operational mode is heating It is set to the cooling setpoint when the operational mode is cooling Supply Air Setpoint Reset Curve If the Supply Temperature Setpoint Reset Curve is enabled the MPU2 keeps track of the differential between each zone s space temperature and its temperature setpoin...

Page 20: ...d the MPU2 operates with the usual heating and cooling supply air temperature setpoints Figure 7 Supply Air Setpoint Reset Curves Heating Sequence The controller provides support for either two stages of electric heating or one floating point or 0 10V modulating heat ing output valve or variable speed circulator You can specify which type of heat you are using through configuration parameters ...

Page 21: ...uts can be configured for floating point control of a heating valve Floating point control is enabled when heating stages are set to zero and the Heating Valve Travel Time is non zero The heating stage 1 out put is the valve open signal and the heating stage 2 output is the valve close signal After a reset the floating point valve is calibrated by closing the valve for a period of the travel time ...

Page 22: ...tion starts when the selected stage would normally start i e if stage 2 is selected as the modulating stage it starts if stage 1 has been active for the staging interval and the temperature is still below the heating control band If the modulating stage is not the last stage subsequent stages are activated once the Stage Threshold percentage has been met by the modulating output and has remained t...

Page 23: ...orx MPU2 505 009 Effective April 28 2014 23 2014 Taco Electronic Solutions Inc Figure 9 Modulated Staging with 2 Stages 2nd Stage Modulating Figure 10 Modulated Staging with 2 Stages 1st Stage Modulating ...

Page 24: ...l band all of the stages immediately cycle off Figure 11 Staged Cooling Sequence Staged Cooling Sequence 2 Stages Shown Occupied Mode Calculated Cooling Setpoint Cooling Control Band Stage 1 Off Stage 2 Off Stage 1 On Stage 2 On T1 T2 T1 T2 Temperature T1 Stage Cycle Time T2 Stage Cycle Time x 2 Cooling with Floating Point Control The cooling outputs can be configured for floating point control of...

Page 25: ...dulation The controller can combine its staged and modulated modes In the combined mode of operation the modulated out put is considered to be one of the stages The stage to be associated with modulation is selected in the Staged Cooling configuration page Modulation starts when the selected stage would normally start i e if stage 2 is selected as the modulating stage it starts if stage 1 has been...

Page 26: ...iWorx MPU2 26 505 009 Effective April 28 2014 2014 Taco Electronic Solutions Inc Figure 12 Modulated Staging with 2 Stages 2nd Stage Modulating ...

Page 27: ...modulated economizer types You can specify which type of economizer you are using through a configuration parameter Both economizer types are enabled based on the avail ability of free cooling from the outside air Free cooling can be determined by enthalpy comparisons or dry bulb com parison In order to provide maximum energy savings the cooling stages are interlocked with the economizer Figure 14...

Page 28: ...nabled when there is free cooling available as determined by the enthalpy or dry bulb calculations When the economizer is enabled the economizer triac output is energized When the economizer is disabled the economizer output is de energized A configuration parameter is available to optionally dis able the economizer during unoccupied periods When the economizer is enabled a Proportional Integral P...

Page 29: ...ponent from becoming too large there is anti wind up reset protection This protection clamps the integral value when all of the components add up to more than 100 or less than 0 The following equa tions are used for P I control Kp Proportional Gain Ki Integral Gain A separate static pressure setpoint is provided to increase the supply static pressure when an IAQ alarm condition exists The bypass d...

Page 30: ...ancy Mode occupied unoccupied and bypass Alarm Conditions IAQ Mode and Heat Failed On The following information is transferred from the VAVD to the MPU2 controller Zone temperature Calculated Heating Setpoint Calculated Cooling Setpoint IAQ Sensor Status safe alarm Local Alarm VAVD shutdown Occupancy Mode occupied unoccupied and occupied extension Supplemental heat status on off Associating VAVDs ...

Page 31: ...rol to maintain a comfort space temperature Once the space temperature is brought within the calculated setpoints and an IAQ Alarm condition still exists the controller resumes the IAQ mode of opera tion The controller has a configurable alarm delay function This function allows the controller to attempt to clear the IAQ condition with the economizer before triggering an alarm If the IAQ condition...

Page 32: ...unning the backup schedule By default both the unoccupied and occupied times are set to zero which disables the local backup schedule This causes the controller to default to the occupied mode of operation when communications are lost to the LCI for 10 minutes or longer Runtime Accumulations The total runtime is accumulated for the heating cooling and fan outputs The runtimes can be used to indica...

Page 33: ... MPU2 and the meanings and default values for controller parameters For more information on using the LCI see the iWorX LCI Application Guide Inputs The Inputs screen displays the current values of the MPU2 s inputs These values cannot be changed Input Range Description Outside Temp 29 to 230 F 33 9 to 110 C The outside air temperature communi cated through the LCI from the ASM con troller Inside ...

Page 34: ...ioning Structure N A Commissioning Settings Setpoints Structure N A Setpoint Settings Supply Temp Reset Curve Structure N A Reset Settings Pressure Settings Structure N A Static Pressure Settings MPU Settings Structure N A MPU Settings Staged Cooling Structure N A Staged Cooling Settings Modulated Cooling Structure N A Modulated Cooling Settings Floating SP Cooling Structure N A Floating Point Val...

Page 35: ... place the controller into that over ride mode Damper Percentage 0 00 to 100 00 0 00 Damper setting to use when the controller is placed in Damper Percentage override mode Setting Range Default Description Cooling Setpoint 45 0 to 65 0 F 7 2 to 18 3 C 55 0 F 12 2 C Temperature setpoint for the cool ing mode Heating Setpoint 55 0 to 130 0 F 12 8 to 54 4 C 90 0 F 32 2 C Temperature setpoint for the ...

Page 36: ...etpoint for supply air static pres sure IAQ Setpoint 2 50 and 5 00 W C 1 50 W C Setpoint for supply air static pres sure when an IAQ alarm is present Kp 0 00 and 100 0 5 00 Proportional gain of the econo mizer s P I control loop Ki 0 00 and 100 0 0 05 Integral gain of the economizer s P I control loop Minimum Output 0 0V and 10 0V 0 0V Minimum output voltage for the Bypass Damper output Maximum Ou...

Page 37: ...ing cooling setpoints to form the temperature range in which local heating cooling is enabled Stage Time 0 to 255 minutes 5 minutes The rate at which stages are sequenced Setting Range Default Description Kp 0 00 to 100 00 per F 5 00 Proportional gain of the P I control loop Ki 0 00 to 100 00 0 05 Integral gain of the P I control loop Min AO Voltage 0 0 to 10 0 V 0 0 V Minimum output voltage for m...

Page 38: ...ated economizer Kp 0 00 to 100 00 per F 5 00 Proportional gain of the econo mizer s P I control loop Ki 0 00 to 100 00 0 05 Integral gain of the economizer s P I control loop Min AO Voltage 0 0 to 10 0 V 0 0 V Minimum output voltage for modu lated economizer Max AO Voltage 0 0 to 10 0 V 0 0 V Maximum output voltage for modu lated economizer Setting Range Default Description Type Rtn Air Humidity G...

Page 39: ...eating 0 to 65 535 hours 1000 hours Runtime limit for heating after which a maintenance alarm is gen erated Fan 0 to 65 535 hours 1000 hours Runtime limit for fan after which a maintenance alarm is generated Setting Range Default Description Hours 0 23 0 Hour to start occupancy unoccu pied times Minutes 0 59 0 Minute to start occupancy unoccu pied times Setting Range Default Description IAQ Delay ...

Page 40: ...w which additional cooling will not be enabled See Note below Alarm Range Alarm Trigger Alarm Reset Fan Failure Normal Alarm Occurs when the fan input detects that the fan is not running after a 30 second grace period after the fan has been activated The cause of the emergency condition must be resolved and the controller must be reset Smoke Normal Alarm Occurs when the smoke alarm input detects t...

Page 41: ...e emergency condition must be resolved Maintenance Normal Alarm Occurs when the fan heating or cooling operating hours have exceeded their Runtime limit To clear the alarm a user must enter a new value for the alarm limit or reset the accumulated times to zero LED Indication Status Solid green when running and configured by an LCI networking Flashing green when running and NOT configured by an LCI...

Page 42: ... power to the controller Refer to the LCI documentation for more infor mation on resetting the controller using the LCI Can my iWorx system contain multiple MPU2 controllers Yes provided that you do not exceed the maximum number of controllers that can be handled by the Local Control Interface LCI Can I reverse the minimum and maximum val ues for the bypass damper Yes This will result in reverse d...

Page 43: ...m with a unit follow the steps below before contacting your local TES representative or TES technical service 1 Make sure controllers sensors and power supplies are connected and communicating to desired devices 2 Record precise hardware setup indicating the following Version numbers of applications software Controller firmware version number A complete description of difficulties encountered Note...

Page 44: ...covered by this warranty TES products are not intended for use to sup port fire suppression systems life support sys tems critical care applications commercial aviation nuclear facilities or any other applica tions where product failure could lead to injury to person loss of life or catastrophic property damage and should not be sold for such pur poses If in doubt as to whether a particular produc...

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