Fan Mode; Cooling Mode; Heating Mode - Kaisai FLY INVERTER Series Service Manual

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, medium, 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

1.5.1 Compressor Control
T means the temperature compensation.
• When T1-Ts < T-2℃, the compressor ceases
operation.
• When T1-Ts > T+3℃, 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 and compressor frequency.
• For different outdoor units, the fan speeds are
different.
1.5.4 Condenser Temperature Protection
When condenser temperature is more than setting value,
the compressor ceases operations..
1.5.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured
value, the compressor and outdoor fan cease operations.

1.6 Heating Mode

1.6.1 Compressor Control
T means the temperature compensation.
• 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/medium/low/auto. And the anti-cold wind
function has the priority.
• When indoor unit coil temp. is low, the anti-cold air
function will start and indoor fan motor will run at low
speed, the speed can't be changed ,when the temp.
is lower than setting value, the indoor fan motor will
stop.
• When the indoor temp reaches the setting temp., the
compressor will stop, the indoor fan motor will run at
the minimum speed or setting speed.(The anti-cold air
function is valid).
1.6.3 Outdoor Fan Control:
• The outdoor unit will be run at different fan speed
according to T4 and compressor frequency.
• For different outdoor units, the fan speeds are
different.
1.6.4 Defrosting mode
• The unit enters defrosting mode according to the
temperature value of T3 and T4 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:
• T3 rises above TCDE1°C.
• T3 maintained above TCDE2°C for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
1.6.5 Evaporator Temperature Protection
When the evaporator temperature exceeds a preset
protection value, the compressor ceases operations.
Page 15