YKEQ-YCNQ 251~671 GR Air Conditioners Service Manual
10
Defrosting time chart
Outdoor Fan ON OFF ON
Revering Valve ON OFF ON
Compressor Relay ON OFF ON OFF ON
39S 5S Defrost Count MAX 12min 19S 15S t
6. “FAN” mode operation
The indoor fan motor always turns on at the set speed and the vane motor turns on at the set fettle.
7. 4-way Valve control
HEATING ON
COOLING/DRY OFF
The 4-way valve reverses for 5 seconds right before start-up of the compressor as following chart:
COOLING/DRY TO HEATING HEATING TO COOLING/DRY
Compressor
4-way Valve
5s 2min
Outdoor Fan
8. “SLEEP” mode
When the SLEEP button is pressed, the SLEEP mode is selected as following:
The indoor fan speed is set at the low speed, the power lamp and the sleep lamp is on, the temperature off
after 5 minutes.
When selecting COOLING/DRY operation with SLEEP mode, the set temperature will be raised by 1
℃ 1
hour later and by 2℃ 2 hour later.
When selecting HEATING operation with SLEEP mode, the set temperature will be dropped by 1℃ 1
hour later and 2℃ 2hour later.
After the System operates in SLEEP mode for 8 hours, it will stop automatically.
9. Fan motor control
(1) Rotational frequency feedback control
The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the
microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the
target rotational frequency, the microprocessor adjusts fan motor electric to make the current rotational
frequency close to the target rotational frequency. With this control, when the fan speed is switched, the
rotational frequency changes smoothly.
(2) When the rotational frequency feedback signal has not output for 5 seconds (or when the microprocessor
can’t detect the signal for 5 seconds), the fan motor is regarded locked-up. Then the electric current to the fan
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