12-47
CONTROL SYSTEM
Revision Y06-01
Service Manual - LEX
12B.3.15 Protection
x
When all relays meet their function requirements at the same time, there
should be an interval of 0.5 second between every two relays. The action
procedures are as follows:
ON state:
AHEAT
Æ
RV
Æ
OFAN —> COMP
OFF state:
AHEAT
Å
RV
Å
OFAN
Å
COMP
12B.3.16
Compressor delay protection
x
At startup if the operation mode is not change, compressor will keep on
running during the first 5 minutes, and it will delay for 3 minutes for a re-start
once it was turned off.
x
Compressor starts at 3 minutes delay unless:
x
Power is on for the first time or power off lasts for 3 minutes, COMP has no 3
minutes delay protection;
12B.3.17 RV control
x
In cooling or drying mode or fan mode, RV is off.
x
In heating mode, RV will turns on.
x
Switching between heating mode to other modes, or shutting off in heating
mode, RV delays 2 minutes before turning off.
12B.3.18 5 Diagnostic
x
If MCU detect that one of the sensors RT, ICT or, OCT is blow -40ºC or over
85ºC, the sensor is invalid and will be indicated (see 3.13).But the air-
conditioner operates continuously.
x
In Cooling or Heating mode, COMP turns on for 20 minutes and turns off for 5
minutes, it is continuously cycle by cycle. In Dry mode, COMP turns on for 10
minutes and turns off for 6 minutes.
x
If RT is invalid, system runs at cycle by cycle mode.
x
If OCT and ICT are invalid, system runs at cycle by cycle mode too.
x
For cooling only unit’s type, if ICT is wrong, system runs at cycle by cycle
mode.
