INNOVAIR DC INVERTER NEXXOS
SERVICE MANUAL
w w w . i n n o v a i r . c o m
1.4 Fan Mode
When fan mode is activated:
• The outdoor fan and compressor are stopped.
• Temperature control is disabled and no temperature
setting is displayed.
• The indoor fan speed can be set to high, med, low, or
auto.
• The louver operations are identical to those in cooling
mode.
• Auto fan: In fan-only mode, AC operates the same as
auto fan in cooling mode with the temperature set at
24°C.
1.5 Cooling Mode
Cooling temperature compensation (
∆
t5) is a well-
setting parameter of EEPROM. The default value is 0. The
compressor ceases operation when
T1-Ts<-2
.
1.5.1 Compressor Control
∆
T is the programmed parameter of temperature
compensation.
• When T1-Ts <
∆
T-2
℃
, the compressor ceases
operation.
• When T1-Ts >
∆
T-0.5
℃
, the compressor continues
operation.
• When the AC is operating in mute mode, the
compressor operates at a low frequency.
• When the current exceeds the preset value, the current
protection function activates and the compressor
ceases operation.
1.5.2 Indoor Fan Control
• In cooling mode, the indoor fan operates continuously.
The fan speed can be set to high, medium, low, or
auto.
• If the compressor ceases operations when the
configured temperature is reached, the indoor fan
motor operates at the minimum or configured speed.
1.5.3 Outdoor Fan Control
• The outdoor unit will be run at different fan speed
according to T4.
• For different outdoor units, the fan speeds are
different.
1.5.4 Condenser Temperature Protection
• When TP3<T3< TP3+5, the compressor frequency will
decrease to the lower level until to F1 and then runs at
F1.If TP3-3<T3< TP3, the compressor will keep running
at the current frequency.
• When T3< TP3-3, the compressor will not limit the
frequency and resume to the former frequency.
• When T3> TP3+5 for 5 seconds, the compressor will
stop until T3< TP3-3.
1.5.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured
value, the compressor ceases operations.
1.6 Heating Mode (For heat pump models)
Heating temperature compensation (
∆
t3) is a well-setting
parameter of EEPROM. It's value ranges from -6°C to 6°C.
1.6.1 Compressor Control
• When T1-Ts>-
∆
T, the compressor ceases operation.
• When T1-TS<
∆
T-1.5°C, the compressor continues
operation.
• When the AC is operating in mute mode, the
compressor operates at a low frequency.
• When the current exceeds the preset value, the current
protection function activates and the compressor
ceases operation.
1.6.2 Indoor Fan Control:
• When the compressor is on, the indoor fan can be
set to high/med/low/auto. And the anti-cold wind
function has the priority.
• The indoor fan speed will adjust according to the value
of T1-TS.
1.6.3 Outdoor Fan Control:
• The outdoor unit will be run at different fan speed
according to T4.
• For different outdoor units, the fan speeds are
different.
1.6.4 Defrosting mode
• The unit enters defrosting mode according to changes
in the temperature value of T3 and the value range of
temperature change of T3 as well as the compressor
running time.
• In defrosting mode, the compressor continues to run,
the indoor and outdoor motor will cease operation,
the defrost light of the indoor unit will turn on, and
the “
” symbol is displayed.
• If any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
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