12b-16
CONTROL SYSTEM
Revision 0
12B.4.15 Protection
• 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 RV OFAN —> COMP
OFF state:
AHEAT RV OFAN COMP
12B.4.16 Compressor delay protection
• 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.
• Compressor starts at 3 minutes delay unless:
• Power is on for the first time or power off lasts for 3 minutes, COMP has no 3 minutes
delay protection;
12B.4.17 RV control
• In cooling or drying mode or fan mode, RV is off.
• In heating mode, RV will turns on.
• Switching between heating mode to other modes, or shutting off in heating mode, RV
delays 2 minutes before turning off.
12B.4.18 Diagnostic
• 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.
• 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.
• If RT is invalid, system runs at cycle by cycle mode.
• If OCT and ICT are invalid, system runs at cycle by cycle mode too.
• For cooling only unit’s type, if ICT is wrong, system runs at cycle by cycle mode.
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