Johnson Controls TEC3320 Series - User Manual

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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

S
Sean JohnsonSep 1, 2025
What does 'USB Malfunction' mean on my Johnson Controls TEC3320 Controller?
- H
  Heather PriceSep 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.
J
Jesus SantiagoSep 14, 2025
What does 'Zone Temp Unreliable' mean on my Johnson Controls Controller?
- B
  Bryan ChangSep 14, 2025
  If your Johnson Controls Controller displays 'Zone Temp Unreliable', it means all sources of zone temperature, including the onboard sensor, are unreliable. You will need to order replacement units and return the affected devices to Johnson Controls under the RMA program.
P
phensleyAug 31, 2025
Why does my Johnson Controls Controller show 'Fan Lock'?
- T
  Tammy GoodAug 31, 2025
  If your Johnson Controls Controller displays 'Fan Lock' and control has shut down, it means the switch connected to the BI configured for Fan Lock didn't sense airflow within 10 seconds of starting the fan. Here's how to address it: First, inspect the equipment to ensure the fan functions. Next, check the sensor functionality with an ohmmeter and verify the wiring to the TEC. Then, reset the fault by going to the menu, selecting Fault Status, and choosing Fan Lock. If the problem persists, you may need to order replacement units and return the affected devices to Johnson Controls under the RMA program.
M
Mark BellSep 16, 2025
Why can't my Johnson Controls Controller access a USB drive?
- I
  Isaac BatesSep 16, 2025
  If the Johnson Controls Controller is unable to access a USB drive, the drive might be formatted as NTFS or another unsupported format. The TEC supports FAT and FAT32 formats only. Reformat the USB drive, or try a different USB drive with a supported format. Alternatively, the USB drive may be defective, so try a different one.
J
John MillerSep 15, 2025
Why does my Johnson Controls TEC3320 show an error when restoring settings from a backup?
- M
  Ms. Vanessa Richards DVMSep 15, 2025
  If the controller provides an error when trying to restore settings from a backup on your Johnson Controls Controller, the USB drive may be defective, the restore file may be corrupt, or the restore file may be from an incompatible model TEC. Try a different USB drive, try restoring a different backup file, and ensure that the backup file being restored was from the same model TEC.
C
cindyfrancisSep 23, 2025
Why is the temperature displayed lower than actual on my Johnson Controls TEC3320?
- R
  rperrySep 23, 2025
  If the temperature displayed on your Johnson Controls Controller is lower than the actual room temperature, cold air drafts may be entering the back of the TEC, or air may be forced through the TEC from a nearby vent. To fix this, seal any holes behind the TEC to reduce drafts, or move the location of the TEC or change the venting to prevent air from being forced through the TEC.
J
jamesperezAug 27, 2025
How to resolve a 'Board Mismatch' error on my Johnson Controls Controller?
- A
  Andrew CookAug 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.
M
Melissa PopeAug 27, 2025
What does 'Changeover Fail' mean on my Johnson Controls TEC3320 Controller and how to fix it?
- J
  James Snyder DVMAug 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.
G
gravessummerAug 26, 2025
Why is the TEC3000 zone temperature not changing fast enough on my Johnson Controls TEC3320?
- S
  Sarah FreemanAug 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'.
R
robinsmithAug 26, 2025
How to troubleshoot a 'Supply Temp Fail' error on a Johnson Controls TEC3320 Controller?
- A
  Amanda CarsonAug 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.

Johnson Controls TEC3320 Series Specifications

General

Model	TEC3320 Series
Type	Controller
Input Voltage	24 VAC/VDC
Number of Analog Outputs	2
Display	LCD
Operating Temperature	32 to 122°F (0 to 50°C)
Storage Temperature	-40 to 70 °C
Relative Humidity	5 to 95% (non-condensing)
Enclosure	Plastic
Communication Protocol	BACnet MS/TP, Modbus RTU
Controller Type	Programmable Controller
Power Consumption	5 VA maximum

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