Taco Electronic Solutions iWorx MPU2 Application Manual Download Page 2

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iWorx® MPU2

505-009-2, Effective: June 30, 2015

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Summary of Contents for iWorx MPU2

Page 1: ...on 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...

Page 2: ...iWorx MPU2 2 505 009 2 Effective June 30 2015 2015 Taco Electronic Solutions Inc THIS PAGE LEFT BLANK INTENTIONALLY...

Page 3: ...ing 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 contro...

Page 4: ...ident 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...

Page 5: ...l 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 inst...

Page 6: ...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 s...

Page 7: ...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...

Page 8: ...ns 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 ele...

Page 9: ...iWorx MPU2 505 009 Effective June 30 2015 9 2015 Taco Electronic Solutions Inc Figure 3 Typical MPU2 Wiring Example B...

Page 10: ...ity 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 typ...

Page 11: ...e 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...

Page 12: ...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 He...

Page 13: ...r 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 Cl...

Page 14: ...6 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...

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 confi...

Page 16: ...ual 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 cool...

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 t...

Page 18: ...rimary 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 b...

Page 19: ...lue 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 coolin...

Page 20: ...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 o...

Page 21: ...immediately cycle off Figure 8 Staged Heating and Cooling Heating with Floating Point Control The heating stage outputs can be configured for floating point control of a heating valve Floating point...

Page 22: ...ed 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 Heating configuration page M...

Page 23: ...orx MPU2 505 009 Effective June 30 2015 23 2015 Taco Electronic Solutions Inc Figure 9 Modulated Staging with 2 Stages 2nd Stage Modulating Figure 10 Modulated Staging with 2 Stages 1st Stage Modulati...

Page 24: ...dditional time period the next available stage is turned off This cycle continues until all available stages have been de energized If the supply air temperature drops below the cooling setpoint minus...

Page 25: ...ontrol Kp Proportional Gain Ki Integral Gain Error CoolingLoopSp SpaceTemp Cooling with Stages and Modulation The controller can combine its staged and modulated modes In the combined mode of operatio...

Page 26: ...iWorx MPU2 26 505 009 Effective June 30 2015 2015 Taco Electronic Solutions Inc Figure 12 Modulated Staging with 2 Stages 2nd Stage Modulating...

Page 27: ...med periodically to determine if free cooling is available from the outside air The out side enthalpy is calculated based on the outside air temperature and humidity The outside temperature and humidi...

Page 28: ...AQ occurred it returns to mechanical cooling When the economizer is disabled it closes completely A configuration parameter is available to optionally disable the economizer during unoccupied periods...

Page 29: ...mable minimum and maximum outputs are provided for the bypass damper These settings can be reversed for reverse action Overrides are provided to assist in system air balancing during commissioning Ana...

Page 30: ...oring The MPU2 monitors the supply air temperature to determine if the heating and cooling stages are operating properly During heating mode if the supply air temperature does not rise above the heat...

Page 31: ...ensors connected to discrete inputs of each zone controller When the local zone IAQ sensor indicates that contaminants are above a preset limit the MPU2 energizes the fan After a preset time delay the...

Page 32: ...ed Air Low Limit Dirty Filter CO2 Alarm Supply Air Temperature Alarms The following alarms can be generated based on supply air monitoring Cooling Failed Heating Failed Heat Stuck On Maintenance Alarm...

Page 33: ...r SMK Fan Status Off On Status of the fan proof switch FNP Low Limit Normal Low Limit Status of the mixed air low limit indication switch MLL Filter Status Normal Dirty Status of the filter switch FIL...

Page 34: ...ructure N A Floating Point Valve Heating Set tings Fan Type Auto On Auto Set to On to enable continuous operation during occupied mode Otherwise fan switches on and off automatically according to the...

Page 35: ...ly air is at its coolest Max Differential 0 0 to 30 0 F 0 0 to 16 7 C 0 0 F 0 0 C Differential at or above which the supply air is at its warmest Cool Setp Low 45 0 to 65 0 F 7 2 to 18 3 C 45 0 F 7 2...

Page 36: ...cooling 0 to 2 heating 4 2 Number of stages controlled Set to zero to disable heating or cooling Control Band 0 to 10 F 0 to 5 6 C 1 0 F 0 6 C Value used to modify the calcu lated heating and cooling...

Page 37: ...On Mod Unocc Off Disabled Type of Economizer Disabled Two State and ON when unoccupied Two State and OFF when unoccu pied Modulated and ON when unoccupied or Modulated and OFF when unoccupied Setpoin...

Page 38: ...ity Setpoint Shutoff Offset 0 0 to 10 0 F 0 0 to 5 56 C 2 0 F 1 1 C Heating setpoint offset to shut off dehumidification Setting Range Default Description Cooling 0 to 65 535 hours 1000 hours Runtime...

Page 39: ...mperature above which economizer is disabled See Note below Min OAT Econ 7 6 to 122 F 22 to 50 C 4 F 20 C Outside Air Temperature below which economizer is disabled See Note below SAT Cooling Limit 45...

Page 40: ...y fan only if the supply air temperature does not drop below 150 F after five minutes The cause of the emergency condition must be resolved Maintenance Normal Alarm Occurs when the fan heating or cool...

Page 41: ...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 no...

Page 42: ...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 product is suitable for use with a TES product or part or for any a...

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