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Ensure the operating temperature is within the allowable range, as stated in diagram below:
Cooling
52
50
43
40
30
20
10
0
-10
10
20
14
19
23
Indoor WB temperature (°C)
The unit is equipped with a controller main board, and a wired remote controller is connected to the controller main
board.
All the setting in the unit is preset by the manufacturer. It is not recommended to change the setting unless necessary or
mentioned below.
a) Remote Controller Location
The remote controller is located on a metal bracket behind the service panel. It is packed together with installation
manual.
UATYQ250
CONTROL
BOX
b) LED Display (Controller Main Board)
The LED will blink when power up the unit.
c) LCD Display (Remote Controller)
During normal operations, the LCD displays compressor on/off status, mode, set temperature and so on. Refer to
Operating Manual for the details of operation guide. The LCD will display the main screen upon power-up. When
malfunctioning occur, a pop-up message will appear on the LCD with backlight blinking and 'beep' sound.
d) Optional Configurations
The controller main board can be used as the interface for thermostat control and BMS system.
(i) Thermostat control (TB_THM-I)
ü
To use this control, set Dip Switch Setting: SW1-ON (default is OFF).
ü
Follow the method below for thermostat control inputs:
G
Y1
Y2
W1
0
0
0
0
1
0
0
0
X
1
0
X
X
1
1
X
X
0
X
1
X
0
X
1
Remark: X = Don't care.
OPERATING RANGE
Heating
20
18
10
0
-10
-15
-20
10
20
15
30
Indoor DB temperature (°C)
CONTROL OPERATION GUIDE
Remove
panel
W2 Mode
Operation
0
-
Unit off
0
Fan
Indoor fan on
X
Cool
1 stage compressor
X
Cool
2 stage compressor
0
Heatpump/Heater
1 stage compressor
1
Heatpump/Heater
2 stage compressor
The use of the air conditioner outside the range
of working temperature and humidity can
result in serious failure.
Refer Operating Range for unit with
economizer option in part (E) (vi) in chapter
"OPTIONAL ACCESSORY".
DB = Dry Bulb
30
27
WB = Wet Bulb
UATYQ350, 450, 550, 600, 700 & 900
CONTROL
BOX
ON
OFF
CAUTION
23
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