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VPU2 Air Control - Pressure Independent Multi-Zone
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: January 16, 2013
Plant ID: 001-4026
VPU2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Application Description . . . . . . . . . . . . . . . . . . . . . . . . 15
Sequence of Operation. . . . . . . . . . . . . . . . . . . . . . . . 17
Occupancy State . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operational Mode . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setpoint Calculations . . . . . . . . . . . . . . . . . . . . . . . 20
Supply Air Setpoint Reset Curve . . . . . . . . . . . . . . 20
Outside Air Temperature Lockouts . . . . . . . . . . . . 21
Heating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 22
© 2014 Taco Electronic Solutions, Inc.
Application Guide
Table of Contents
Cooling Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 25
Economizer Operation . . . . . . . . . . . . . . . . . . . . . . 29
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Static Pressure Control . . . . . . . . . . . . . . . . . . . . . 30
Soft Start Ramping . . . . . . . . . . . . . . . . . . . . . . . . 31
Fan Proof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
VPU2 and VAVI Communications . . . . . . . . . . . . . 31
Power On/Reset Delay . . . . . . . . . . . . . . . . . . . . . 32
Supply Air Temperature Monitoring . . . . . . . . . . . . 32
Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Mixed Air Low Limit Detection . . . . . . . . . . . . . . . . 32
Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Real Time Clock (RTC) . . . . . . . . . . . . . . . . . . . . . 33
Local Backup Schedule . . . . . . . . . . . . . . . . . . . . . 33
Runtime Accumulation. . . . . . . . . . . . . . . . . . . . . . 34
Alarms and Events. . . . . . . . . . . . . . . . . . . . . . . . . 34
Automatic Configuration . . . . . . . . . . . . . . . . . . . . 34
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 34
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 44
505-010-2
EFFECTIVE: April 29, 2014
1
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Summary of Contents for Taco iWorx UCP-1
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Page 1: Table Of Contents
Outside Air Temperature Lockouts ... . 21 Heating Sequence ......22 © 2014 Taco Electronic Solutions, Inc. - Page 2 VPU2 THIS PAGE LEFT BLANK INTENTIONALLY 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 3: Vpu2
The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic L networking and communications. This Application Guide is written for: ORKS • Users who engineer control logic 505-010-2, Effective: April 29, 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 VPU2 controller, which supporst one Variable Air Volume 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. 505-010-2, Effective: April 29, 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). 505-010-2, Effective: April 29, 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). 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 8: Wiring Information
WARNING: Terminals 6, 9, 12, 15, and 18 are connected internally on all VPU2 controllers. Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment damage. Figure 2: Typical VPU2 Wiring - Example A 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 9 VPU2 Figure 3: Typical VPU2 Wiring - Example B 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 10: Connecting Input Devices
To connect the Mixed Air thermistor to the unit, attach one wire from the thermistor to MAT (T17) and the other wire to the adjacent common (T18). The thermistor used must be 10K Precon Type III. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 11: Connecting Output Devices
The modulated cooling output can be set to 0-10 V max through the control logic. Connect the positive wire from the cooling output to CLGM (T34) and the other wire to COM (T33). See preceding figures for details. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 12: Other Connections
Connect one output wire from a 24 VAC power supply to PWR (T39) and the other output wire from the power supply to the adjacent common terminal (T38). T38 must be connected to earth ground. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 13: Protocol
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 505-010-2, Effective: April 29, 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 505-010-2, Effective: April 29, 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 modulating economizer feature is disabled. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 16 As the temperature decreases below the heating setpoint, the heating output will be modulated open. The heat- ing output will be modulated closed as the temperature increases above the heating setpoint. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 17: Sequence Of Operation
The VPU2 operates in one of three occupancy states: extended occupancy, occupied, or unoccupied. A host device on the network determines the active operating mode. An optional backup schedule is provided for cases when the host device is not available. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 18: Operational Mode
The VPU2 enters the occupied state from shutdown, extended occupied, morning warm-up, and emergency heating states. It remains in the occupied state until the VPU2 goes into the unoccupied state and no associated zone control- lers are occupied. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 19 During the emergency state, the air handler package unit is off and there is no control of the static pressure or duct temperature. The VPU2 remains in the emergency state until the controller is reset. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 20: Setpoint Calculations
When the Temperature Differential lies 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. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 21: Outside Air Temperature Lockouts
OAT is below the cooling lockout temperature, the primary cooling mode is disabled and the controller can only be in the primary off or primary heating modes. This feature requires a controller that broadcasts the OAT, such as an ASM2 be installed on the network. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 22: Heating Sequence
When the valve is at its calculated 0% or 100% position, the valve is overdriven for 30 seconds to ensure that the valve is fully closed or open. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 23: 2014 Taco Electronic Solutions, Inc
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 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 24: 2014 Taco Electronic Solutions, Inc
VPU2 Figure 9: Modulated Staging with 2 Stages; 2nd Stage Modulating 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 25: Cooling Sequence
If all zone temperature read- ings are within 0.5 °F of their setpoints, the next stage does not cycle on. This cycle continues until all available stages have been energized. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 26 The cooling output will be modulated closed as the temperature decreases below the cooling loop setpoint. When unoccupied mode is entered, the cooling loop setpoint is set up through a separate unoccupied cooling setpoint. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 27 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 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 28 VPU2 Figure 12: Modulated Staging with 2 Stages; 2nd Stage Modulating Figure 13: Modulated Staging with 2 Stages; 1st Stage Modulating 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 29: Economizer Operation
When the economizer is enabled, a P+I control loop modulates the economizer output. The P+I control loop modulates the economizer position to maintain a constant mixed air temperature. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 30: Dehumidification
0.025" W.C. above the static pressure loop setpoint. When the static pressure is within ±0.025” W.C. of the static pressure setpoint, the damper output remains at its current level. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 31: Soft Start Ramping
The following information is transferred from the VAVI to the VPU2 controller: • Zone temperature • Calculated Heating Setpoint • Calculated Cooling Setpoint • IAQ Sensor Status (safe, alarm) 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 32: Power On/Reset Delay
An input is provided for a mixed air low limit detection device. If a low limit condition is detected, all of the stages and the fan turn off. Once the low limit is corrected, reset the controller to clear this condition. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 33: Filter Status
This causes the controller to default to the occupied mode of opera- tion when communications are lost to the LCI for 10 minutes or longer. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 34: Runtime Accumulation
This section describes the commands available on the LCI for configuration of the VPU2, and the meanings and default values for controller parameters. For more information on using the LCI, see the iWorx® LCI Application Guide. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 35: Inputs
0.00% to 100.00% Current state of the heating output. VFD Output 0.00% to 100.00% Current state of the VFD output. Cool Output 0.00% to 100.00% Current state of the cooling output. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 36: Configuration
Settings for the IAQ alarm IAQ Sensor Structure Settings for the IAQ analog sensor Cutoff Temps Structure Provides entries for cutoff tempera- tures for heating, cooling, and economizer functions. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 37 Heat Setp High 55.0 to 130.0 °F 130.0 °F Highest heating SP when the zone (12.8 to 54.4 °C) (54.4 °C) is at its coolest. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 38 Displays all of the modulated heating or cooling settings and provides access to edit these parameters from a single screen. Setting Range Default Description 0.0 to 100.00% per F 5.00% Proportional gain of the economiz- ers P+I control loop. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 39 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 10.0 V Maximum output voltage for modu- lated economizer. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 40 Displays all the backup schedule settings and provides access to edit these parameters from a single screen. Setting Range Default Description Hour 0 to 23 Hour to start occupied/unoccupied times. Minute 0 to 59 Minute to start occupied/unoccu- pied times. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
- Page 41 SAT Cooling Limit 45 to 65 °F 55 °F Supply air temperature below (7.22 to 18.3 °C) (12.8 °C) which additional cooling will not be enabled. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc.
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Page 42: Alarms
To clear the alarm, a user must enter cooling operating hours have a new value for the alarm limit or reset exceeded their Runtime limit. the accumulated times to zero. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 43: Troubleshooting
– Off when there is no network activity Service – Illuminated when the service pin is depressed or when a controller gets configured by the LCI. Figure 15: VPU2 Controller LEDs Status Network Service 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. -
Page 44: Troubleshooting Tips
1.Make sure controllers 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. 505-010-2, Effective: April 29, 2014 © 2014 Taco Electronic Solutions, Inc. - Page 45 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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