• Single-stage cooling and heating with dedicated fan speed relays
(Locally purchased)
Max.
16 units
Indoor unit
Fan
Thermostat convertor
AC 208/230 V
AC 24 V
Thermostat controller
Transformer*
AC 24 V
*: Install the transformer as necessary, per building code and manufacturer’s installation instruc-
tions. (Maximum power: 5.0 VA)
Terminal name Application
TC Common (In) from transformer
C Common to the thermostat controller
TR Power supply from transformer
R Power supply to thermostat controller
G3 Airflow High
G2 Airflow Medium
G1 Airflow Low
Y2 Cooling stage 2
Y1 Cooling stage 1
W2 Heating stage 2
W1 Heating stage 1
G Fan
NOTES:
•
For remote controller cable, 2-wire type and 3-wire type are available depending on the device
to be connected.
• All wiring shown should be performed with 18 AWG thermostat wire.
• Terminals to thermostat controller on Thermostat convertor support AC 20 to 30 V.
• HIGH/MED/LOW fan signals are optional, and may not be available on all thermostat con-
trollers.
• Signals for stage 2 are optional. W2 and Y2 terminals may not be used in single-stage ther-
mostats. To use the stage 2 signals, turn on the DIP switch SET3-1 on each convertor.
• Up to 16 indoor units be controlled with a single thermostat controller. Multiple indoor units con-
nected to one Thermostat convertor are operable by the same operating setting.
• Two or more types of VRF system, single model, or multi systems cannot be mixed together.
3-5. Thermostat convertor (UTY-TTRX) - (05-138) - 3. Adaptor/Convertor units
CONTROL
SYSTEM
CONTROL
SYSTEM
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