Brief Description Of Modes And Functions - Gree GWH09KF-K3DNA5G Service Manual

Service Manual

6.2 Brief Description of Modes and Functions

1.Temperature Parameters
●Indoor preset temperature (Tpreset)
●Indoor ambient temperature (Tamb.)
2. Basic Functions
Once energized, in no case should the compressor be restarted within less than 3 minutes. In the situation that memory function is
available, for the first energization, if the compressor is at stop before de-energization, the compressor will be started without a 3-minute
lag; if the compressor is in operation before de-energization, the compressor will be started with a 3-minute lag; and once started, the
compressor will not be stopped within 6 minutes regardless of changes in room temperature;
(1)COOL mode
① The condition and process of cooling
If Tamb≥Tpreset COOL mode will act, the compressor and outdoor fan will run, and the indoor fan will run at the set speed.
If Tamb≤Tpreset-2°C, the compressor will stop, the outdoor fan will delay 30 seconds to stop, and the indoor fan will run at the set
speed. If Tpreset-2°C≤Tamb ≤Tpreset , the unit will keep running in the previous mode. In this mode, the reversal valve will not be
powered on and the temperature setting range is 16 ~30°C.
② Protection function
●Overcurrent protection
If total current is high, the compressor will run in limited frequency. If total current is too high, the compressor will stop, the outdoor fan
will delay 30 seconds to stop, indoor unit will display E5 and outdoor yellow light will blink 5 times.
●Antifreezing protection
When the antifreezing protection is detected, the compressor will stop, the outdoor fan will stop after 30 seconds, and the indoor fan
and swing motor will keep running in the original mode. When antifreezing protection is eliminated and the compressor has stopped for
3 minutes, the compressor will resume running in the original mode.
(2) Dehumidifying mode
① Working conditions and process of dehumidifying
If Tamb.>Tpreset, the unit will enter cooling and dehumidifying mode, in which case the compressor and the outdoor fan will operate
and the indoor fan will run at low speed.
If Tpreset -2°C≤Tamb.≤Tpreset, the compressor remains at its original operation state.
If Tamb.< Tpreset -2°C, the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will operate at low
speed.
② Protection function
Protection is the same as that under the cooling mode.
(3) HEAT mode
① The condition and process of heating
If Tamb≤Tpreset+2°C, HEAT mode will act, the compressor, outdoor fan and reversal valve will run, the indoor fan will delay 3min to
stop at the latest.
If Tpreset +2°C≤Tamb≤Tpreset +5°C,the unit will keep running in the original mode.
If Tamb≥Tpreset +5°C, the compressor will stop, the outdoor fan will delay 30sec to stop and indoor fan will blow 60S at low speed, the
fan speed cannot be shifted within blow residual heat.
●In this mode, the temperature setting range is 16 ~30°C.
●The air conditioner will adjust the running frequency of the compressor automatically according to the change of ambient temperature.
●When the unit is turned off in HEAT mode, or switched to other mode from HEAT mode, the four-way valve will be powered off after
the compressor stops.
② The condition and process of defrosting
When frost is detected in the condenser, the system will enter into defrosting state. When defrosting starts, the compressor and indoor
fan will stop, and the outdoor fan and four-way valve will delay 30 seconds to stop. The compressor will start after 15 seconds and
then defrosting will be started. When the compressor has run for 7 minutes or defrosting is finished, the compressor will stop. After 30
seconds the four-way valve opens and after another 60 seconds, the compressor and outdoor fan resume running. The indoor fan will
delay 3 minutes to run at the latest and heating indicator on indoor unit OFF 0.5s and ON 10s.
③ Protection function
●Anti-cold-wind protection
In HEAT mode, in order to prevent the indoor unit from blowing out cold wind, each time the compressor starts, the indoor fan will delay
3 minutes after the compressor to run at the latest and it can adjust fan speed automatically when temperature is low.
●Overcurrent protection
Overcurrent protection is the same with that in COOL mode.
●Cold air prevention
The unit is started under heating mode (the compressor is ON):
Installation and Maintenance
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