INNOVAIR DC INVERTER NEXXOS
SERVICE MANUAL
1. Operation Modes and Functions
1.1 Abbreviation
Unit element abbreviations
Abbreviation
Element
T1
Indoor room temperature
T2
Coil temperature of evaporator
T3
Coil temperature of condenser
T4
Outdoor ambient temperature
TS
Set temperature
TP
Compressor discharge temperature
1.2 Safety Features
Compressor three-minute delay at restart
Compressor functions are delayed for up to one minute
upon the first startup of the unit, and are delayed for up
to three minutes upon subsequent unit restarts.
Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds 115°C
for five seconds, the compressor ceases operation.
Automatic shutoff based on fan speed
If the indoor fan speed registers below 300RPM for an
extended period of time, the unit ceases operation and the
corresponding error code is displayed on the indoor unit.
Inverter module protection
The inverter module has an automatic shutoff mechanism
based on the unit’s current, voltage, and temperature.
If automatic shutoff is initiated, the corresponding error
code is displayed on the indoor unit and the unit ceases
operation.
Indoor fan delayed operation
• When the unit starts, the louver is automatically
activated and the indoor fan will operate after a period
of 7 seconds.
• If the unit is in heating mode, the indoor fan is
regulated by the anti-cold wind function.
Compressor preheating
Preheating is automatically activated when T4 sensor is
lower than 3°C.
Sensor redundancy and automatic shutoff
• If one temperature sensor malfunctions, the air
conditioner continues operation and displays the
corresponding error code, allowing for emergency use.
• When more than one temperature sensor is
malfunctioning, the air conditioner ceases operation.
Refrigerant leakage detection
This function is active only when mode is selected. It will
detect if the compressor is being damaged by refrigerant
leakage or by compressor overload. This is measured
using the coil temperature of evaporator T2 when the
compressor is in operation.
1.3 Display Function
Unit display functions
Function
Display
Temperature
Set temperature value
Temperature
(fan and Drying
mode)
Room temperature
Activation of Timer
ON, Fresh, Swing,
Turbo, or Silent
(3s)
Cancellation of
Timer OFF, Fresh,
Swing, Turbo, or
Silent
(3s)
Defrost
Warming in heating
mode
Self-clean (available
on select units only)
Heating in room
tempurature
under 8°C
WiFi control
(available on select
units only)
ECO function
(available on select
units only)
set temperature
gradually illumninates to
in
one second interval
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