Air Conditioner Service Manual
21
Note: The function setting:
Within 3 min while power on unit, set the unit on cooling mode, set temperature 30
℃
, and mid fan speed, press the
ECO button 10 times within 8s, the AUTO-RESTART will be activated.
6.2.10 Protection
6.2.10.1 Overload protection
1. Overload protection for Cooling or Dry mode
1). if:
a. OPT≥62
℃
, unit stops working for overload protection.
b. OPT
＜
55
℃
, after compressor stopped for 3 min, can the unit be started to operate.
2). When OPT≥55
℃
, the compressor will be frequency limited/reduced for over load protection.
3). If unit have 6 times of over load stop-working protection continuously,
this protection can’t be recovered unless
press ON/OFF button, and unit will show failure code.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of over load
stop-working protection will be reset to zero and start a new counting process.
The failure and times for protection will eliminate immediately once the unit to be switched off, on fan mode or
changed to be heating mode from others.
Note: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed.
2. Overload protection for Heating mode
1). If:
a. IPT≥62
℃
, unit stops working for overload protection.
b. IPT
＜
55
℃
, after compressor stopped for 3 min, can the unit be started to operate.
2). When IPT≥55
℃
, the compressor will be frequency limited/reduced for over load protection.
3). If unit have 6 times of over load stop-
working protection continuously, this protection can’t be recovered unless
press ON/OFF button, and unit will show failure code.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of over load
stop-working protection will be reset to zero and start a new counting process.
The failure and times for protection will eliminate immediately once the unit to be switched off, on fan mode or
changed to be heating mode from others.
Note: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed.
6.2.10.2 The compressor discharge temperature protection
1. If ODT≥115
℃
, unit stops working for over temperature protection;
While ODT
＜
100
℃
, & after compressor stopped for 3 min, the unit can be started to operate.
2. If ODT≥100
℃
, the compressor will be frequency limited/reduced for over temperature protection.
3. If unit have 6 times of
discharge over temperature stop working protection
continuously, this protection can’t
be recovered unless press ON/OFF button, and unit will show failure code.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of discharge
over temperature stop working protection will be reset to zero and start a new counting process.
The failure and times for protection will eliminate immediately once the unit to be switched off, or changed to fan
mode.
N
ote: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed.
6.2.10.3 The current protection
1. If the unit A/C working current more than
Limited current (I
LC
)
, the compressor will be frequency limited /
reduced for over current protection.
2. When unit A/C working current more than
Stopped current (I
SC
)
, AC unit stops working. Only when the
compressor stops for 3 min can the unit be recovered operation.
3. If unit have 6 times of
over current stop-working protection
continuously, this protection can’t be recovered
