Product Features
Page 83
2. Operation Modes and Functions
2.1 Abbreviation
Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2
Coil temperature of evaporator
middle
T2B
Coil temperature of evaporator
outlet(It is located in outdoor unit)
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
T5 Compressor discharge temperature
TS Setting temperature
2.2 Safety Features
Open Circuit/Disconnection Sensor Protection
Automatic shutoff based on fan speed
For A6 Duct type,
If a fault occurs on the air volume regulator or the
regulator enters protection mode, it sends the error
message CF and an instruction to reduce fan speed to the
master. The message and the instruction can be inquired
with the remote controller or the wired controller. (Fault
and protection information are displayed for one minute).
After a fault occurs, the master unit shows the error code
E3 and the fault count for one minute.
If the fault occurs three times, then the fan is unable to
resolve the problem independently. External shutdown by
a remote controller, wired controller, or central controller
must be used to clear the fan fault and fault count. The
fan runs normally for 5 minutes while clearing fault count.
For other types,
If the indoor fan speed registers below 300RPM for an
extended period of time, it shuts off and restarts in 30
seconds. If this happens 3 times, the unit ceases operation
and the corresponding error code is displayed on the
indoor unit.
If outdoor fan speed registers below 100RPM or higher
than 2400RPM for an extended period of time, the unit
ceases operation and the corresponding error code is
displayed on the indoor unit and outdoor unit.
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.
Zero crossing detection error protection(For Forest
series)
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.
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.
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.
Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds a certain
level for a period of time, the compressor ceases operation.
Oil return
Running rules:
1. If the compressor frequency keeps lower than setting
frequency for setting time, the AC will rise the frequency
to setting frequency for setting time and then resume to
former frequency.
2. The EXV will keep 300p while the indoor units will keep
the current running mode.
If the outdoor ambient is higher than setting frequency
during the oil return, the AC quit oil return.
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