Only trained and qualified personnel should design, install, repair and service HVAC systems and equipment. All national standards and safety codes
must be followed when designing, installing, repairing and servicing HVAC systems and equipment. It is the responsibility of the Dealer to ensure local
codes, standards, and ordinances are met.
© Carrier Corporation 2023
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TECHNICAL INFORMATION
COMMUNICATION
Number: TIC2023-0007 Date: 6/30/2023
Title: FJ4DNXA Fan Coil – White Wire (Heating)
Product Category: Fan Coils
Products Affected
FJ4DNXA18 Fan Coils
Situation
The 018 fan coils will be redesigned to be like the rest of the product fan coil family. Starting week 24
of 2023 the 018 fan coils will include a white wire in the harness between “W” and motor tap 4 which
will call for the fan to operate without a call for “G” from the thermostat. Most thermostats energize “G”
when “W” is energized or can be programmed to function this way.
Technical Information
On units built prior to week 24, 2023; use a thermostat that can be programmed to initiate a “G” call
with either “Y” or “W” or add a wire from “W” to the motor tap 4 connection.
Design through week 23, 2023 Design after week 23, 2023
Quality and Continuous Improvement
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