Operation Modes And Functions; Abbreviation; Safety Features; Display Function - Kaisai FLY INVERTER Series 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.
Zero crossing detection error protection
If AC can not detect zero crossing signal for 4 minutes or
the zero crossing signal time interval is not correct, the unit
will stop and the LED will display the failure. The correct
zero crossing signal time interval should be between
6-13ms.
Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds 108°C
for a period of time, 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.
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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 cooling 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 Room temperature
mode)
Activation of Timer
ON, Fresh, Swing,
Turbo, or Silent
Cancellation of
Timer OFF, Fresh,
Swing, Turbo, or
Silent
Defrost
Warming in heating
mode
Self-clean (available
on select units only)
Heating in room
temperature
under 8°C
(3s)
(3s)