En-4
The names of terminal connected to thermostat have the following mean-
ings.
TC
Common (In) from transformer
C
Common to thermostat controller
TR
Power supply from transformer
R
Power supply to thermostat controller
G3
Air
fl
ow High
G2
Air
fl
ow Medium
G1
Air
fl
ow Low
Y2
Cooling Stage 2
Y1
Cooling Stage 1
W2
Heating Stage 2
W1
Heating Stage 1
G
Fan
NOTES:
・
Up to 16 indoor units may be controlled with a single thermostat control-
ler, Multiple indoor units connected to convertor operate by the same
operating setting.
・
Two or more types of VRF1 system, VRF2 system, single model or
multi systems cannot be mixed together.
5. 2.
Unit wiring
5. 2. 1 Thermostat cable and Remote controller cable
1-5/16 in
(33 mm)
1/4 in
(7 mm)
Thermostat cable
Remote controller cable
For 2-wire type
For 3-wire type
9/16 in
(15 mm)
1/4 in
(7 mm)
9/16 in
(15 mm)
No polarity
1/4 in
(7 mm)
Y1:Red
Y2:White
Y3:Black
WARNING
Tighten the terminal screws to the speci
fi
ed torques, otherwise,
abnormal overheating may be occurred and possibly cause heavy
damage inside the unit.
Tightening torque
M2 screw
Remote controller / Y1, Y2, Y3
Thermostat input / G, W1, W2,
Y1, Y2, G1, G2, G3, R, TR, C, TC
1.9 to 2.2 lbf·in
(0.22 to 0.25 N·m)
(2.2 to 2.5 kgf·cm)
CAUTION
To peel the sheath from the cables, use a dedicated tool that will not
damage the conductor of the cable.
When installing a screw on the terminal block, do not cut the cable
by overtightening the screw. On the other hand, a loosen screw can
cause faulty contact, which will lead to a communication failure.
6. INSTALLING THE THERMOSTAT CONVERTOR
WARNING
Always use the accessories and speci
fi
ed installation work parts. Check
the state of the installation parts. Not using the speci
fi
ed parts will cause
units to fall off, electric shock,
fi
re, etc.
Install at a place that can withstand the weight of the unit and install
positively so that the unit will not topple or fall.
When installing this product, make sure that there are no children
nearby.
Otherwise, injury or electric shock could result.
CAUTION
Do not set the DIP switch of this product except as speci
fi
ed in this instal-
lation manual or the instruction manual supplied with the air conditioner.
Setting the switches other than speci
fi
ed will cause an accident or
trouble.
Use an insulated screwdriver to set the DIP switches.
Before opening the cover of this product, completely discharge static
electricity charged on your body. Otherwise, failure or malfunction could
result.
Do not touch the circuit board and circuit board parts directly with your
hands.
Otherwise, injury or electric shock could result.
Tightening the mounting screws too tight will damage the body of this
product.
• When using the indoor unit without Fan mode, do not
connect G (Fan), G1, G2, and G3 signals. Otherwise air
conditioner might operate incorrectly.
• If the air conditioner system is a heat pump type, please
select “ Priority on Administrative Indoor Unit” in the setting
of priority mode by PUSH SWITCH of outdoor unit (refer to
installation manual of outdoor unit). Furthermore, please
complete “Administrative Indoor Unit Setting” for indoor unit
which is connected to this Thermostat Convertor by using
the wired remote controller (refer to installation manual of
remote controller.)
NOTES:
When this product is used, do not use the remote controller because
indoor unit is controlled centrally by thermostat controller.
However, the remote controller connecting is temporarily required for the
initial setting. During the initial setting by remote controller do not con-
nect Thermostat Convertor to indoor unit.
After when all initial setting is completed, disconnect the wired remote
controller. Then connect Thermostat Converter to indoor unit at
fi
rst time.
6. 1.
Connecting the cables
(1) For thermostat cable, use the single wire of 18AWG thermostat wire.
(2) Power-supply voltage of thermostat (TC, TR) is 20 to 30VAC.
(3) Insert the cable to the connected terminal and
fi
x with screw using
screw driver.
(4) For remote controller cable, 2 kinds of 2 kinds of type, which are
2-wire type and 3-wire type are available depending on the device to
be connected.
(5) The number of connected thermostat cable is different the type of
thermostat controller.
(6) For details of connection method, refer to Case 1 to Case 3 of “5.
Wiring”.
Summary of Contents for UTY-TTRX
Page 9: ......
