24
Installation and Maintenance
Service Manual
●
Outdoor Unit
1. Input parameters compensation function
Under cooling mode, indoor ambient temperature that involved in control operation =(T indoor amb. –
⊿
T0
℃
indoor amb. compensation of
cooling).
Under heating mode, indoor ambient temperature that involved in control operation = (T indoor amb. –
⊿
T3
℃
indoor amb. compensation of
heating ).
2. Valid judgment control of parameter
For stable operation of the complete unit, please insert outdoor discharge temperature sensor into the corresponding temperature sensor
bushing of discharge pipe to let the control system can detect discharge temperature of system accurately. Otherwise, the unit will stop
operation and the unit will display that outdoor discharge temperature sensor is invalid (hasn’t inserted tightly). Press ON/OFF button on
remote controller can resume the operation.
3. Cooling mode
3.1 Working conditions and process of cooling
3.1.1: (T indoor amb. –
⊿
T indoor amb. compensation of cooling) – T set≥0.5
℃
, the unit operates under cooling mode;
3.1.2: (T indoor amb. –
⊿
T indoor amb. compensation of cooling) – T set≤-2
℃
, or (T indoor ambient temperature –
⊿
T indoor amb.
compensation of cooling) – T set
＜
-1
℃
and last for 6 minutes and the frequency has dropped to the lower limit, that means the unit will
stop operation at the designated temperature;
3.1.3 Otherwise, keep the original operating status.
3.2 Temperature setting range:
3.2.1: If T outdoor amb.≥
【
T low-temperature cooling temperature
】
, the temperature setting range is 16~30
℃
(cooling under normal
temperature);
3.2.2: If T outdoor amb.
＜【
T low-temperature cooling temperature
】
, the temperature setting range is 25~30
℃
(cooling under low
temperature), that is, the estimated lowest setting temperature of outdoor unit is 25
℃
.
4. Dry mode
4.1 Working condition and process for drying: the same as cooling mode:
4.2 The temperature setting range is the same as cooling mode;
5. Fan mode
5.1 Compressor, ODU fan motor and 4-way valve are all be turned off;
5.2 The temperature setting range is 16~30
℃
.
6. Heating mode
6.1 Working condition and process for heating: (T indoor amb. is the actual temperature detected by indoor ambient temperature sensor;
⊿
T indoor amb. compensation of heating is indoor ambient temperature compensation during heating process)
6.1.1: T set – (T indoor amb. –
⊿
T indoor amb. compensation of heating) ≥0.5
℃
, the unit operated under heating mode;
6.1.2: T set – (T indoor amb. –
⊿
T indoor amb. compensation of heating) ≤-2
℃
, or T set – (T indoor amb. –
⊿
T indoor amb. compensation
of heating)
＜
-1
℃
and last for 6 minutes, and the frequency has decreased to the lower limit, the unit will stop operation when reaching to
temperature point;
6.1.3: Otherwise, the unit operates at the original operating status.
7. Defrosting control (heating mode)
7.1 After entering the defrosting time condition, if it is detected that it satisfies the condition of entering into defrosting temperature condition
for 3 minutes successively, the unit will enter into defrosting.
7.2 Defrosting-starting: the compressor stops operation and is restarted up after being delayed for 55s;
7.3 Defrosting-ending: the compressor stops operation and is restarted up after being delayed for 55s.
7.4 When defrosting-ending condition satisfied any one of conditions as below, defrosting operation will be exited:
7.4.1: T outdoor tube≥
【
T defrosting exit temp. 1
】
;
7.4.2: T outdoor amb.<-5
℃
, and T outdoor tube≥
【
T defrosting exit temp. 2
】
continuous time exceeds 80 seconds;
7.4.3: Defrosting time reaches
【
T the longest defrosting time
】
.
8. Compressor control
8.1 Frequency of compressor is fuzzy controlled according to the relationship between ambient temperature and set temperature, and the
change speed of ambient temperature;
8.2 Turn on the unit under cooling, heating or drying mode, compressor will be started up after ODU fan motor is started up for 15s;
8.3 When turn off the unit, stop operation due to protection of mode switchover, compressor will stop operation immediately.
8.4 Under every mode: once compressor is started, it can be allowed to stop operation after operating for 7 minutes (Notes: including the
closedown condition at temperature point; not including the error protection, closedown by remote controller, mode switch and related
conditions that require the compressor to stop operation).
8.5 Under every mode: once compressor is stopped, compressor can be restarted up after delayed for 3 minutes (Notes: for the indoor unit
with power-off memory function, after closing down and re-energizing, it can be restarted without time delay).
9. ODU fan motor control
9.1 When turn off the unit with remote controller, stop operation due to protection or stop operation when reaching to temperature point,
ODU fan motor stops operation after compressor is stopped for 1 minutes;
9.2 Under fan moor: ODU stops operation.
9.3 Defrosting-starting: enter into defrosting condition. ODU stops operation after compressor stops for 50s;
9.4 Defrosting-ending: exit defrosting condition. Compressor starts to heat again, and ODU will start operation 15s in advance.
10. 4-way valve control
10.1 4-way valve is close under cooling, drying and fan mode.
10.2 When the unit is started up under heating mode, 4-way valve is energized immediately.
。
