Taco iWorx SMZ1 Application Manual
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Taco iWorx SMZ1 Application Manual

Hydronic snow melt controller
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Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: November 19, 2013
Plant ID: 001-4165
SMZ1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . 3
Representations and Warranties . . . . . . . . . . . . . . . . . 3
Applicable Documentation . . . . . . . . . . . . . . . . . . . . . . 4
Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
About this Document . . . . . . . . . . . . . . . . . . . . . . . . 5
Inspecting the Equipment . . . . . . . . . . . . . . . . . . . . 5
Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . 5
Selecting a Power Source . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . 6
Routing Cabling to the Device . . . . . . . . . . . . . . . . . 7
Grounding the Device . . . . . . . . . . . . . . . . . . . . . . . 7
© 2015 Taco Electronic Solutions, Inc.
Application Guide
SMZ1 Hydronic Snow Melt Controller

Table of Contents

Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Input Devices . . . . . . . . . . . . . . . . . . . 13
Connecting Output Devices . . . . . . . . . . . . . . . . . . 14
Other Connections. . . . . . . . . . . . . . . . . . . . . . . . . 15
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application Description. . . . . . . . . . . . . . . . . . . . . . . . 17
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 17
Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . 17
Additional Features . . . . . . . . . . . . . . . . . . . . . . . . 18
Automatic Configuration . . . . . . . . . . . . . . . . . . . . 19
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 20
Network Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 26
505-048-2
EFFECTIVE: March 10, 2015
1

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Summary of Contents for Taco iWorx SMZ1

  • Page 1: Table Of Contents

    Grounding the Device ..... . . 7 Troubleshooting Tips ..... . . 26 © 2015 Taco Electronic Solutions, Inc.
  • Page 2 SMZ1 THIS PAGE LEFT BLANK INTENTIONALLY 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 3: Smz1

    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 4: Applicable Documentation

    SMZ1 Taco Electronic Solutions, Inc. will not be responsible for any product or part not installed or operated in conformity with the Document and instructions or which has been subject to accident, 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...

  • Page 5: Static Electricity

    Optimally, the equipment should be installed within a secure enclosure. The equipment must be installed indoors unless contained within a protective enclosure. The enclosure must maintain internal temperature and humidity within the ranges specified for this equipment. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 6: Selecting A Power Source

    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). 505-048-2, Effective: March 10, 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). 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 8: Wiring Information

    WARNING: Terminals 12, 15, 18 and 38 are connected internally on all SMZ1 controllers. Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment dam- age. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 9 SMZ1 Figure 2: SMZ1 - Power Sourcing 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 10 SMZ1 Figure 3: SMZ1 Power Isolated 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 11 SMZ1 Figure 4: SMZ1 Global Snow Melt - Four Zones - Power Sourcing 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 12 SMZ1 Figure 5: SMZ1 - Global Snow Melt - Four Zones - 5 Wire Sensor - Power Sourcing 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 13: Connecting Input Devices

    This input uses a snowmelt sensor (individual zone snowmelt mode set as “Zone Sense” or “Zone Sense With Idle”). To connect the snowmelt sensor, attach one wire to the SMS2 (T16) and the other to the associated COM (T15). 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 14: Connecting Output Devices

    The Primary Circulator output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preced- ing figures for details. If the load is less than 1 Amp, connect it to PC (T29) and TC12 (T30). 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 15: Other Connections

    TV reception. SPECIFICATIONS Electrical Inputs • Cabling: twisted shielded pair, 18 AWG recommended—500 feet max. (152 meters) • Resolution: 10 bit ZoneSlab 1/2/3/4 Temperature • Precon Type III 10K thermistor 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 16: Mechanical

    • 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 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 17: Application Description

    When operating in Zone Sense mode, the SMZ1 activates any zone when that zone's local Snowmelt Sensor input is active and the zone's slab temperature is below the slab melt setpoint temperature. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 18: Additional Features

    °C]), this alarm is sent to the LCI. An alarm of this type is most likely due to a wiring fault causing the input to be shorted or open. An open sensor results in a reading of -60 °F (-51 °C), while a short appears as 230 °F (110 °C). 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 19: Communication With Associated Devices

    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. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 20: Controller Identification

    °F relates to an open sensor Slab 2 Temp -60 to 230 °F (-51 to 110 °C) 230°F relates to a shorted sensor Slab 3 Temp Slab 4 Temp 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 21: Outputs

    Current setpoint for each zone. Zone 3 Setpoint Zone 4 Setpoint Runtimes 0 to 65535 hours Actual number of run hours for the output Z1, Z2, Z3, Z4, G1, G2, P 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 22: Configuration

    Dry Contact Describes type of Global Snow Melt Sensor. Can be Five Wire Dry Contact type or five-wire type with unregulated heating element (requires wiring connections to SHT and HT). 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 23 Limit at which a unit maintenance alarm is generated. 0 to 65535 hours 1000 Limit at which a unit maintenance alarm is generated. 0 to 65535 hours 1000 Limit at which a unit maintenance alarm is generated. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 24: Alarms

    Sensor Reading is within the specified is Open or Short Sensor range or faulty sensor gets replaced Unit Maintenance Alarm Normal, Alarm Any of the output runtimes Runtimes are reset. exceeds the specified limit. 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 25: 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 7: SMZ1 Controller LEDs Status Network Service 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.

  • Page 26: Troubleshooting Tips

    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 application software. Device and/or firmware version number. A complete description of difficulties encountered. Notes: 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 27 SMZ1 505-048-2, Effective: March 10, 2015 © 2015 Taco Electronic Solutions, Inc.
  • Page 28 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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