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Johnson Controls TEC3620 Series - User Manual

Johnson Controls TEC3620 Series
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TEC3000 Series Proportional Fan Coil and Individual Zone Thermostat
Controllers with Dehumidification Capability Installation Instructions
1
Refer to the QuickLIT website for the most up-to-date version of this document.
Applications
The TEC3000 Series Proportional Fan Coil and Individual Zone Thermostat Controllers are stand-alone and
field-selectable BACnet® MS/TP or N2 networked devices that provide control of the following:
• local hydronic reheat valves
• pressure-dependent variable air volume (VAV) equipment with or without local reheat
• two- or four-pipe fan coils
• cabinet unit heaters
• other individual zone equipment using a proportional 0 to 10 VDC control input
The networked models feature a field-selectable Building Automation System (BAS) BACnet MS/TP or N2
communication capability that enables remote monitoring and programming for efficient space temperature control.
All models include a USB port configuration that reduces installation time by allowing simple backup and restore
features from a USB drive, which enables rapid cloning of configuration between like units.
Some models have occupancy sensing capability built into the device. These thermostat controllers maximize up to
30% energy savings in high-energy usage commercial buildings, such as schools and hotels, during occupied
times by using additional standby setpoints.
All models feature an intuitive onboard touchscreen UI with backlit display that makes setup and operation quick
and easy. Multiple fan configurations are supported for fan coil equipment types:
• single-speed
• multi-speed (two or three discrete speeds)
• variable-speed/EC motors (0 to 10 VDC control)
Some models support dehumidification on two-pipe fan coil units with reheat, and four-pipe fan coil units with or
without reheat. When no heating is required, the thermostat controller monitors space humidity and activates
dehumidification control as necessary. Heat and/or reheat is used as required to maintain the space temperature.
For optimal dehumidification performance, use a fan coil unit that has a multi-speed or variable-speed fan (VSF).
TEC3000 Series Proportional Fan Coil and Individual Zone
Thermostat Controllers with Dehumidification Capability
Installation Instructions
TEC3320-xx-xxx, TEC3321-xx-xxx, TEC3322-xx-xxx, TEC3323-xx-xxx,
TEC3620-xx-xxx, TEC3621-xx-xxx, TEC3622-xx-xxx, TEC3623-xx-xxx
Part No. 24-10788-0, Rev.
E
Issued July 2018
(barcode for factory use only)
*24107880E*
24-10788-0, Rev. E

Table of Contents

Questions and Answers

  • C
    christina90Aug 25, 2025
    How to troubleshoot a 'Supply Temp Fail' error on a Johnson Controls TEC3620 Controller?
    • C
      Caitlin CampbellAug 26, 2025
      If your Johnson Controls Controller displays 'Supply Temp Fail', the external supply temperature sensor is either disconnected or has failed. You can try these steps: First, check the sensor wiring. If intentionally disconnected, reset the sensors by going to the menu, then Control Setup, and selecting Inputs. If the problem continues, order replacement units and return the affected devices to Johnson Controls under the RMA program.
  • J
    James CollinsAug 26, 2025
    Why is the TEC3000 zone temperature not changing fast enough on my Johnson Controls TEC3620 Controller?
    • R
      Ryan RiversAug 26, 2025
      If the TEC3000 zone temperature on your Johnson Controls Controller isn't changing fast enough compared to a calibrated sensor, it might be because the TEC3000 is set up for larger spaces by default when a proportional device is active. To resolve this, go to Control Setup > Tuning > Equipment Size and select 'Oversized'.
  • K
    kristinroseAug 27, 2025
    What does 'Changeover Fail' mean on my Johnson Controls TEC3620 and how to fix it?
    • K
      Kayla WiseAug 27, 2025
      If your Johnson Controls Controller displays 'Changeover Fail', it indicates that the Supply Temperature Sensor is either not installed, has failed, or has been disconnected. As a result, the TEC can't detect the changeover mode for cooling or heating. You can follow the same troubleshooting steps as for a 'Supply Temp Fail' alarm.
  • M
    Monica CoxAug 27, 2025
    How to resolve a 'Board Mismatch' error on my Johnson Controls Controller?
    • A
      Anthony WhiteAug 27, 2025
      If your Johnson Controls Controller displays 'Board Mismatch', it means the baseboard and CPU board are not correctly paired. The TEC will show an error message with the model numbers of both boards. To fix this, match the baseboard to its corresponding CPU board.
  • J
    Jacob CarsonAug 28, 2025
    What causes 'Humidity Unreliable' on a Johnson Controls Controller?
    • J
      Janice GarnerAug 29, 2025
      If the zone humidity reading on your Johnson Controls Controller was reliable but has now failed, and if the source of zone humidity was the onboard sensor, contact Johnson Controls product sales and support. If the source was a BAS, check the BAS to ensure it's online and providing the TEC with the humidity reading. If you intentionally removed the BAS mapping, reset the sensors through the menu.
  • B
    Brenda HuertaAug 29, 2025
    How do I fix a 'Firmware Mismatch' error on my Johnson Controls Controller?
    • M
      malonereginaldAug 29, 2025
      If your Johnson Controls Controller displays 'Firmware Mismatch', it means a previous upgrade or downgrade hasn't completed. If it's due to an incomplete upgrade, upgrade the TEC3000 to the latest released version, then upgrade it to the current version again. If it's an incomplete downgrade because the previous version is no longer supported, reboot the TEC3000 to clear the fault.
  • P
    Peter WilliamsAug 30, 2025
    What to do if my Johnson Controls TEC3620 Controller shows 'Open Window'?
    • T
      Tracy BarryAug 30, 2025
      If your Johnson Controls Controller displays 'Open Window' and control has shut down, it means the switch connected to the BI configured for Open Window is sensing that a window is open. To solve this: First, close the window. If the problem persists, check the sensor functionality with an ohmmeter and verify the wiring to the TEC. If needed, order replacement units and return the affected devices to Johnson Controls under the RMA program.
  • S
    Sean DawsonAug 23, 2025
    What to do if the touchscreen is unavailable on my Johnson Controls TEC3620?
    • T
      tinaharrellAug 23, 2025
      If the touchscreen components on your Johnson Controls Controller have failed to initialize, try rebooting the controller. If the problem continues, you may need to order replacement units and return the affected devices to Johnson Controls under the RMA program.
  • T
    Tony ReillySep 1, 2025
    Why is 'Dehum Unavailable' on my Johnson Controls TEC3620 Controller?
    • M
      Michael BellSep 1, 2025
      If your Johnson Controls Controller displays 'Dehum Unavailable', it means dehumidification is unavailable because the zone humidity sensor has either failed or the humidity reading isn't reliable. If the zone humidity source was a BAS, check the BAS to ensure it's online and providing the TEC with the humidity reading. If you intentionally removed the BAS mapping, reset the sensors through the menu. If the problem continues, you may need to order replacement units and return the affected devices to Johnson Controls under the RMA program.
  • R
    rgarciaSep 2, 2025
    What does 'USB Malfunction' mean on my Johnson Controls TEC3620 Controller?
    • B
      bowenchaseSep 2, 2025
      If your Johnson Controls Controller displays 'USB Malfunction', it means a USB drive has malfunctioned and drawn too much current. First, try inserting the USB drive again. If that doesn't work, try a different USB drive. If the problem persists, you might need to order replacement units and return the affected devices to Johnson Controls under the RMA program.

Johnson Controls TEC3620 Series Specifications

General IconGeneral
ModelTEC3620 Series
TypeController
Controller TypeProgrammable
SeriesTEC3620
Input Voltage24 VAC/VDC
Output Voltage24 VAC/VDC
DisplayLCD
Enclosure RatingIP20
Communication ProtocolBACnet, Modbus
Humidity Range95% RH
Operating Temperature-40 to 150°F (-40 to 66°C)

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