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MPU2 Air Control - Pressure Dependent Multi-Zone
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: December 19, 2014
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
What is Not Included with this Equipment . . . . . . . . 6
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
© 2015 Taco Electronic Solutions, Inc.
Application Guide
Table of Contents
Heating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 20
Cooling Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 24
Economizer Operation . . . . . . . . . . . . . . . . . . . . . . 27
Cutoff Temperatures . . . . . . . . . . . . . . . . . . . . . . . 28
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Bypass Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Proof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
MPU2 and VAVD Communications . . . . . . . . . . . . 30
Associating VAVDs . . . . . . . . . . . . . . . . . . . . . . . . 30
Supply Air Temperature Monitoring . . . . . . . . . . . . 30
Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Mixed Air Low Limit Detection . . . . . . . . . . . . . . . . 31
Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Real Time Clock (RTC) . . . . . . . . . . . . . . . . . . . . . 31
Local Backup Schedule . . . . . . . . . . . . . . . . . . . . . 31
Runtime Accumulations . . . . . . . . . . . . . . . . . . . . . 32
Alarms and Events. . . . . . . . . . . . . . . . . . . . . . . . . 32
Automatic Configuration . . . . . . . . . . . . . . . . . . . . 32
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 33
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 41
505-009-2
EFFECTIVE: June 30, 2015
1
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Summary of Contents for Taco Electronic Solutions iWorx MPU2
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Page 1: Table Of Contents
Setpoint Calculations ..... . . 19 Supply Air Setpoint Reset Curve ....19 © 2015 Taco Electronic Solutions, Inc. - Page 2 MPU2 THIS PAGE LEFT BLANK INTENTIONALLY 505-009-2, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. - Page 9 MPU2 Figure 3: Typical MPU2 Wiring - Example B 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. - Page 21 Heating with Modulated Output (Valve or Variable Speed Circulator) The calculated heating loop setpoint is derived from the heating setpoint and the loop proportional gain. CalcHeatingLoopSp = CalcHeatingSp- ½(Kp) 505-009, Effective: June 30, 2015 © 2015 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: June 30, 2015 © 2015 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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Page 24: Cooling Sequence
There is a +/- 1 °F (0.55 °C) deadband around the setpoint to prevent the valve from dithering. During mixed air low limit alarms, the cooling valve is driven to 100%. 505-009, Effective: June 30, 2015 © 2015 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
- Page 26 MPU2 Figure 12: Modulated Staging with 2 Stages; 2nd Stage Modulating 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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Page 27: Economizer Operation
When the economizer is enabled, the economizer triac output is energized. When the econo- mizer is disabled, the economizer output is de-energized. A configuration parameter is available to optionally disable the economizer during unoccupied periods. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 28: Cutoff Temperatures
During dehumidification, the operating mode will be displayed as “Dehumid,” the cooling outputs will stage on, and the stage timer is enforced; or, modulating output or floating point valve will be set to 100%. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 29: Bypass Damper
To return the controller to normal operation after the failure condition is resolved, you must reset the controller by removing and reapplying power or by using the controller reset feature on the LCI. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 30: Mpu2 And Vavd Communications
Setup of the analog sensor requires the IAQ sensor settings to be populated. A Min, Max, Setpoint, and Offset can be specified. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 31: Smoke Detection
When the controller detects that the LCI is not available (after 10 minutes without communications), it resorts to the local backup schedule that has been configured. If the local backup schedule is disabled, the controller defaults to the occupied mode. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 32: Runtime Accumulations
If the response fails, an alarm is displayed on the LCI. The LCI also uses the "ping" message to refresh the occupancy mode and other system wide data. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 33: Controller Identification
Fan Output 0.00% or 100.00% Current state of the fan output. Bypass Damper Pos 0.00% or 100.00% Current state of the bypass output. In Alarm? On, Off Alarm indication 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 34: Configuration
Dmp Fully Open, ride mode. Dmp Fully Closed Damper Percentage 0.00% to 100.00% 0.00% Damper setting to use when the controller is placed in “Damper Percentage” override mode. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. - Page 35 Static pressure to report when the analog input receives 0 volts. Press Max -2.50” and 5.00” W.C. 2.00” W.C. Static pressure to report when the analog input receives 10 volts. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
- Page 36 Minimum output voltage for modu- lated heating or cooling. Out Max 0.0 to 10.0 V 0.0 V Maximum output voltage for modu- lated heating or cooling. If set to 0, Modulation is disabled. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
- Page 37 Dry Bulb Offset 0.0 to 20.0 °F 5.0 °F Difference between return temper- (0.0 to 11.1 °C) (2.78 °C) ature and outside temperature that enables or disables the econo- mizer. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
- Page 38 (0 to 8.3 °C) (2.8 °C) comfort temperature during IAQ Alarm conditions. Deadband 0 to 400 ppm 0 ppm Deadband to allow the IAQ to recover from Alarm condition. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc.
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Page 39: Alarms
Indoor Air Quality Normal, Alarm Occurs when the IAQ sensor Automatic when air quality returns detects inadequate indoor air qual- within normal parameters. ity. 505-009, Effective: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 40: 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. -
Page 41: 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: June 30, 2015 © 2015 Taco Electronic Solutions, Inc. - Page 42 Taco Electronic Solutions, Inc. is a subsidiary of Taco, Inc. Visit our web site at: http://www.taco-hvac.com Printed in the USA iWorx® and iView® are registered trademarks of Taco Electronic Solutions, Inc. © 2015 Taco Electronic Solutions, Inc. LON, LONWORKS, & LONMARK are trademarks of Echelon Corporation...
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