Basic Functions - 30K & 36K 230 Volt; Temperature Parameters - Gree Neo GWH09MA-A3DNA3A Installation, Service & Troubleshooting

Basic Functions - 30K & 36K 230 volt

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 lage; 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) Cooling Mode
a. Working conditions and process of cooling
When Tamb > Tpreset, the unit will enter cooling operation, in which case the indoor fan, the outdoor fan and the
compressor will work and the indoor fan will run at preset speed.
When Tamb < Tpreset -3.6ºF, the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the
indoor fan will run at preset speed.
When Tpreset -3.6ºF < Tamb. < Tpreset +1.8ºF, the unit will remain at its previous state.
• Under this mode, the four-way valve will be de-energized and temperature can be set within a range from 61
to 86ºF.
If the compressor is shut down for some reason, the indoor fan and the swing device will operate at original state.
b. Protection
• Antifreeze protection
Under cooling and dehumidifying mode, 6 minutes after the compressor is started:
If Tevap < 35.6ºF, the compressor will operate at reduced frequency.
If Tevap < 30.2ºF is detected for durative 3 minutes, the compressor will stop, and after 60 seconds, the outdoor fan
will stop; and under cooling mode, the indoor fan and the swing motor will remain at the original state.
If Tevap > 42.8ºF and the compressor has remained at OFF for at least 3 minutes, the compressor will resume its
original operation state.
• Total current up and frequency down protection
If Itotal < 16A, frequency rise will be allowed; if Itotal > 17A, frequency rise will not be allowed; if Itotal > 18A, the
compressor will run at reduced frequency; and if Itotal > 20A, the compressor will stop and the outdoor fan will stop
with a time lag of 60s.
(2) Dehumidifying Mode
a. Working conditions and process of dehumidifying
If Tamb > Tpreset +1.8ºF, 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.
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Product Introduction