INSTALLATION INSTRUCTIONS
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Copyright © 2022 Honeywell Inc. • All Rights Reserved
31-00576-01
TB3 Series Communicating Thermostats
FOR 2-PIPE AND 4-PIPE FAN COIL UNITS
APPLICATION
TB3 Series Fan Coil Thermostats are used in individual
rooms or zones in buildings. It is designed for two and
four-pipe fan coil units. TB3 Series has one universal
input as an external sensor (NTC10k) or open/close
contact input, three relay fan outputs, two relay valve
outputs (TB3140), two analog valve outputs (TB3240),
and one EIA-485 (BACnet MS/TP). It controls the fan
coil unit depending on the internal room sensor or
external return sensor temperature.
The following NTC10K sensor and flange are
recommended: VF10-3B65NW and LF-MF
CAUTION
CAUTION
• The authorized service must do assembly,
maintenance, diagnostic, and repair. The device's
power supply is 220 VAC (TB3140) and 24V
AC/DC (TB3240), and it has no internal fuse.
• External protection with max C10A (TB3140)
and C5A (TB3240) circuit breakers are required
in all cases.
• Disconnect the power supply before separating
the front plate.
INSTALLATION
• Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
• Check the ratings in the instructions and the product
to ensure the product is suitable for your application.
The Installer must be a trained, experienced service
technician.
• After installation is complete, check out product
operation as provided in these instructions.
• All wiring must agree with applicable codes,
ordinances, and regulations, as specified in
installation wiring diagrams.
• TB3 Series thermostat safety rules are in accordance
with the latest technological developments designed
and manufactured. Adhere to the safety precautions
to avoid injury and property damage.
CAUTION
CAUTION
Power off the supply at circuit breaker or fuse
before installation to avoid fire, shock, or death!
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