Gree GVA24AL-K3NNC7A/I Service Manual page 31

Service Manual
status. Timer setting range is 0.5 ～ 24hr in 30-minute increments.
Timer OFF: Timer OFF can be set at unit ON. If selected OFF time is reached, the unit will stop. Timer setting range is 0.5 ～ 24hr in
30-minute increments.
(7) Memory function
① Power failure when the unit is ON
◆ Memory content: ON status, mode, up&down swing, light, set temperature, set fan speed, timer.
◆ Timer can be memorized. Time of timer is calculated again from energization.
② Power failure when the unit is OFF
◆ Memory content: OFF status, mode, up&down swing, light, set temperature, set fan speed, timer.
◆ Timer can be memorized. Time of timer is calculated again from energization.
4. Special function
Health function (for the model with health function)
① If there is health button on the remote controller, the unit defaults health function ON when turning on the unit; press health button
on the remote controller or turning off the unit to stop health function.
① If there is not health button on the remote controller, the unit defaults health function ON when turning on the unit and turning off
the unit to stop health function.
5.Protection function (more details please refer to maintenance section)
(1) Freeze protection (applicable for cooling, drying and auto mode)
During operation, when controller detected that Ttube≤ － 2℃ , the system enters into freeze protection. In that case, the compressor
and the ODU fan motor stop operation, while the IDU fan motor and swing motor operates at previous status. If Ttube≥10℃ and the
compressor has been out of operation for 6 mins, the unit will resume its previous operation status.
Freeze protection period
6 min
Compressor
Outdoor fan motor
Indoor fan motor Set fan speed
(2) Overcurrent protection (applicable for cooling, heating, drying and auto mode)
During operation process, if controller detected that system current exceeds the limit value for 3s consecutively (overcurrent), the
system stops operation. About 3 mins later, if overcurrent is released, the system will resume original operation. If overcurrent
protection occurs for 6 times consecutively, and resume operation time won't exceed 6 mins every time, E5 will be displayed on
indoor unit. After turning off the unit and then turn it on, overcurrent malfunction will be eliminated.
(3) High temperature protection of discharge pipe (for the unit below 24000Btu/h, the software of this function is reserved
while hardware is shielded) (applicable for cooling, heating, drying and auto mode)
When the system just starts and Tdischarge ＞ 130 ℃ , the system will stop operation after internal temperature of system
decreases. When the system has stopped for 3 mins and Tdischarge ＜ 90℃ , the system will resume operation. If this protection
occurs twice consecutively, the system can not resume operation and E4 will be displayed. After turning off the unit and then turn it
on, overcurrent malfunction will be eliminated.
(4) Noise silencing protection (applicable for heating and auto mode)
When turning off the unit or during mode switchover, the 4-way valve is closed. In order to decrease noise, the 4-way valve will delay
2 mins to be closed.
(5) System high pressure protection (applicable for cooling, heating, drying and auto mode)
When system high pressure protection is detected by the controller, all loads stop except IDU fan motor in cooling and drying mode;
all loads stop in heating mode; button and remote control signals are shielded and E1 is displayed. When system high pressure
protection is eliminated, button and remote control signals are available.
(6) Compressor low pressure protection (applicable for cooling, heating, drying and auto mode)
When compressor low pressure protection is detected by the controller, the system stops; button and remote control signals are
shielded and E3 is displayed. When compressor low pressure protection is eliminated, button and remote control signals are
available.
Technical Information
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