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Taco iWorx MPU2 Application Manual

Air control – pressure dependent multi-zone
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MPU2 Air Control - Pressure Dependent Multi-Zone
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: January 16, 2013
MPU2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . 3
Representations and Warranties . . . . . . . . . . . . . . . . . 4
Applicable Documentation . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
About this Document . . . . . . . . . . . . . . . . . . . . . . . . 5
Inspecting the Equipment . . . . . . . . . . . . . . . . . . . . 5
Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . 6
Selecting a Power Source . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . 6
Routing Cabling to the Device . . . . . . . . . . . . . . . . . 7
Grounding the Device . . . . . . . . . . . . . . . . . . . . . . . 7
Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
© 2014 Taco Electronic Solutions, Inc.
Application Guide

Table of Contents

Heating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 20
Cooling Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 24
Economizer Operation . . . . . . . . . . . . . . . . . . . . . . 27
Cutoff Temperatures . . . . . . . . . . . . . . . . . . . . . . . 28
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Bypass Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Proof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MPU2 and VAVD Communications . . . . . . . . . . . . 30
Associating VAVDs . . . . . . . . . . . . . . . . . . . . . . . . 30
Supply Air Temperature Monitoring . . . . . . . . . . . . 30
Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Mixed Air Low Limit Detection . . . . . . . . . . . . . . . . 31
Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Real Time Clock (RTC) . . . . . . . . . . . . . . . . . . . . . 32
Local Backup Schedule . . . . . . . . . . . . . . . . . . . . . 32
Runtime Accumulations . . . . . . . . . . . . . . . . . . . . . 32
Alarms and Events. . . . . . . . . . . . . . . . . . . . . . . . . 32
Automatic Configuration . . . . . . . . . . . . . . . . . . . . 33
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 33
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 42
505-009-2
EFFECTIVE: April 28, 2014
1

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Summary of Contents for Taco iWorx MPU2

  • Page 1: Table Of Contents

    Setpoint Calculations ..... . . 19 Supply Air Setpoint Reset Curve ....19 © 2014 Taco Electronic Solutions, Inc.
  • Page 2 MPU2 THIS PAGE LEFT BLANK INTENTIONALLY 505-009-2, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 3: Mpu2

    ORKS • Automatic configuration with the LCI • Alarm/Event reporting PURPOSE OF THIS GUIDE The iWorx® MPU2 Application Guide provides application information for the MPU2 Controller. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 4: Representations And Warranties

    REPRESENTATIONS AND WARRANTIES This Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All updates to the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsi- bility to ensure that the latest version of the Document is being used.

  • Page 5: Installation Instructions

    The instructions in this manual are for the MPU2 controller, which supports one multiplexed package unit. Inspecting the Equipment Inspect the shipping carton for damage. If damaged, notify the carrier immediately. Inspect the equipment for damage. Return damaged equipment to the supplier. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 6: What Is Not Included With This Equipment

    3.Using a small drill bit pre-drill the mounting holes. 4.Using two #6 pan head screws, mount the controller to the panel. 5.Wire the controller (See Routing Cabling to the Device). 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 7: Routing Cabling To The Device

    For best performance, connect the power supply common terminal (T38) to the same external point as the ground terminal (T40). 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 8: 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 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 9 MPU2 Figure 3: Typical MPU2 Wiring - Example B 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 10: Connecting Input Devices

    (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. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 11: Connecting Output Devices

    The modulated heating output can be set to 0-10 V max through the control logic. Connect the positive wire from the heating output to ECNM (T35) and the other wire to COM (T36). See preceding figures for details. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 12: Other Connections

    Network wiring must be twisted pair. One network wire must be connected to terminal NETA (T1) and the other network wire must be connected to terminal NETB (T2). Polarity is not an issue since an FTT-10A network is used for commu- nications. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 13: Specifications

    Power Requirements • 24VAC (20VAC to 28VAC), requires an external Class 2 supply Power Consumption • 7.2W with no external loads, maximum limited by the Class 2 supply rating 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 14: Mechanical

    • Humidity: 0 to 90%, non-condensing Agency Listings • UL Listed for US and Canada, Energy Management Equipment PAZX and PAZX7. Agency Compliances • FCC Part 15 Class A 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 15: Application Description

    It is used as the first stage of cooling to take advantage of the energy savings. The two-position economizer output is off when the economizer is disabled. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 16 The cooling and heating demands are continually re-evaluated during the heating mode of operation. The controller is capable of switching to the cooling mode when the temperature demand is greater for cooling. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 17 When the Return Air Humidity rises above the humidity setpoint, dehumidification is enabled by enabling the cooling stages, if modulated cooling is enabled; the cooling output goes to 100%. Dehumidification is disabled, when return air humidity drops below the setpoint by 3%. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 18: Sequence Of Operation

    The current operational mode information is periodically transferred to the VAVD over the communications network. The following information is transferred to the VAVD from the primary air source controller: • Operational Mode (primary cool, primary heat, primary fan only, primary off) 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 19: Occupancy Mode

    When the Temperature Differential is between the Temperature Differential Maximum and Temperature Differential Minimum, the Supply Temperature Setpoint is linearly interpolated between the Supply Setpoint High and Supply Set- point Low. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 20: 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. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 21 The P+I control loop will modulate the output to maintain a constant supply temperature. As the temperature decreases below the heating loop setpoint, the heating output will be modulated open. The heating output will be modulated closed as the temperature increases above the heating loop setpoint. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 22 It forces its interval output to the Staging Interval whenever a subsequent stage is deactivated. This feature prevents large jumps in overall heating output. I = Staging Threshold Modulating Output =(K_p × Error) + I 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 23 MPU2 Figure 9: Modulated Staging with 2 Stages; 2nd Stage Modulating Figure 10: Modulated Staging with 2 Stages; 1st Stage Modulating 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 24: Cooling Sequence

    Cooling with Modulated Output (Valve or Variable Speed Circulator) The calculated cooling loop setpoint is derived from the cooling setpoint and the loop proportional gain. CalcCoolingLoopSp = CalcCoolingSp- ½(Kp) 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 25 It forces its interval output to the Staging Interval whenever a subsequent stage is deactivated. This feature prevents large jumps in overall cooling output. I = Staging Threshold Modulating Output= (K_p × Error) + I 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 26 MPU2 Figure 12: Modulated Staging with 2 Stages; 2nd Stage Modulating 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 27: Economizer Operation

    “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: Economizer Control 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 28: Cutoff Temperatures

    °F above the setting. The economizer will close the dampers to the Minimum fresh air position when the OAT is out- side the Max OAT and Min OAT Economizer temperature limits. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 29: Dehumidification

    During unoccupied period, the fan always cycles off when there is no demand for heating or cooling. During IAQ alarm conditions the fan energizes to provide fresh air to the zones. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 30: Fan Proof

    The MPU2 has provisions for detecting a gas valve that has been become stuck in the open position. The stuck gas valve sequence helps to prevent overheating the HVAC unit. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 31: Indoor Air Quality

    Mixed air Low Limit alarms. If heating and cooling are configured as modulated or floating point, the heating valves open to 100%. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 32: Filter Status

    A MPU2 provides programmable run limits for generating runtime maintenance alarms. When the cooling runtime, heating runtime or fan runtime exceeds these limits, a maintenance alarm is sent to the LCI. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 33: Automatic Configuration

    Static Pressure 0.00 to 5.00” W.C. (0 to 1246 Pa) Static pressure in the supply air duct. 0-4000ppm Reading of the indoor air quality sensor when defined as Analog. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 34: Outputs

    Structure Economizer Settings Free Cooling Structure Free Cooling Settings Dehumidification Structure Dehumidification Settings Runtime Limits Structure Runtime Limit Settings Backup Occ Time Structure Backup schedule settings for Occupied mode. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 35 Cool Setp Low 45.0 to 65.0 °F 45.0 °F Lowest cooling SP when the zone (7.2 to 18.3 °C) (7.2 °C) is at its warmest. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 36 0 to 255 min 5 min Minimum amount of time between heating and cooling. Zone Limit 0 to 32 Minimum number of zone demands required before heating or cooling is enabled. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 37 If set to 0 floating point is dis- abled. Deadband 0.0 to 100.00% The desired setpoint must be this far or greater from the actual posi- tion before modulating the actuator. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 38 Always enabled enforced. Setpoint 0.00 to 100.00% Humidity Setpoint Shutoff Offset 0.0 to 10.0 °F 2.0 °F Heating setpoint offset to shut off (0.0 to 5.56 °C) (1.1 °C) dehumidification. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 39 0 to 4000 ppm 0 ppm Maximum ppm sensor setting Setpoint 0 to 4000 ppm 0 ppm Setpoint Offset 0 to 4000 ppm 0 ppm Offset to the sensor reading 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 40: Alarms

    Occurs when Supply Air tempera- The cause of the emergency condition ture is Supply Heat Limit degrees must be resolved. from the setpoint 10 minutes after entering heating mode. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 41: Troubleshooting

    – Green when there is network activity – Off when there is no network activity Service – Illuminated when the service pin is depressed or when a controller gets configured by the LCI. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.

  • Page 42: Troubleshooting Tips

    VFD instead? Thermistor readings fluctuate rapidly, some- The controller is not properly grounded. The controller’s ground times by several degrees. (GND) pin (T40) must be connected to earth ground. 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 43 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. Notes: 505-009, Effective: April 28, 2014 © 2014 Taco Electronic Solutions, Inc.
  • Page 44 Taco Electronic Solutions, Inc., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360. Taco (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436. Taco Electronic Solutions, Inc. is a subsidiary of Taco, Inc.

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