For all units
Power/Operation LED light (both green)
Unit on
Operation LED On, Power LED Off
Unit in standby
Power LED On, Operation LED Off
For all units - Operation LED light (Green)
Blink
LED Display
Item
Reason
Remedy
Green LED blinks 4
times, stops for 3s
E4
Indoor coil sensor 1 failure
Ti1 sensor connection is
unplugged or damaged.
1.
Check if Ti1 plug is connected or not.
2.
Check if sensor’s resistance is correct or not.
Green LED blinks 9
times, stops for 3s
E9
EC motor failure
No EC motor feedback
1.
Check if EC motor’s wires are connected.
2.
Check the EC motor.
Green LED blinks 11
times, stops for 3s
E11
Anti-frozen protection
When unit is standby,
Ti1<35.6°F (2°C)
Turn on unit to keep Ti1 higher than 41°F (5°C)
LED DISPLAY AND ERROR DESCRIPTION
CONTROL LOGIC SPECIFICATION
POWER ON SETTING
1. When any fan speed is selected or the modulating
signal is more than 2 VDC, the unit is turned on.
2. When all of the fan speed inputs (G2/G1/G0) are OFF
and modulating signal is less than 2Vdc, the unit is
turned OFF.
ALARM PROTECTION AND ERROR DISPLAY
If EC motor fails, EH relay is turned OFF at once.
LOUVER
1. When the unit is turned on, the louver will open
to the largest angle at 100°, then move to the
operating angle at 87°.
2. When the unit is turned off, the louver will close.
SIGNAL INPUT
1. When Auto speed is turned ON, the unit is turned on
and the motor runs at 200 RPM.
2. EC motor RPM will be changed by the signal voltage.
ELECTRICAL HEATER OPERATION
1. After unit is turned ON, EH relay will be ON when EH
signal is powered ON and EC motor RPM>500.
2. If EC motor fails or EC motor RPM<500, EH relay is
turned OFF at once and an error code is reported.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
IN WINTER
This is frost protection when the unit is off to prevent
water in the coil and the unit from freezing.
UNIT IS IN STANDBY MODE
If Ti1≤ 35.6°F (2°C) for 2 minutes, the unit will report an
error code and an audible sound will alarm.
Table 7: LED display - for all units
UNIT INSTALLATION
1. Pass the piping through the hole in the wall and hook the indoor unit on the mounting plate by the upper hooks.
2. Move the body of the unit from side to side to verify if it is securely fixed.
3. While pushing the unit toward the wall, lift it slightly from beneath to hook it up on the mounting plate by the
lower hooks.
4. Make sure the unit firmly rests on the hooks of the mounting plate.
DRAIN HOSE INSTALLATION
1. Install the drain hose so that it slopes downward slightly for free drainage. Avoid installing it as shown in the below
illustrations marked with an “X”.
2. Put water in the drain pan and make sure that the water drains outdoors.
3. If the flexible drain hose provided with the indoor unit is not long enough, please extend it by joining it to an ex-
tension hose (not provided). Be sure to insulate the connecting part of the extension drain hose with a shield pipe
as shown.
4. If the attached drain hose passes through an indoor area, insulate it with heat insulation material.
Hook
Putty
Slope
downward
Do not
lift up
It waves
Do not push the
drain hose end in
the drainage ditch
Do not put the
drain hose end
into water
1-15/16in
(50mm)
or more
Shield Pipe
Drain Hose
Extension Drain Hose
Inside the Room
Figure 6: Unit installation
Figure 7: Drain hose installation
Figure 7: Joining to extension hose
(All dimensions are approximate within 1/16 of an inch of those indicated.)
1 9
1 8
