YMGI WMMS-30CH-V2B(59)5, Руководство по обслуживанию, Страница: 32 / 81

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3.2 Stop in heating operation:
3.2.1 When all the indoor units reach the stop condition, the compressor stops and the outdoor fan stops after 1min
3.2.2 Some of the indoor units reach the stop condition
The compressor reduces the frequency immediately and operates according to the required frequency.
3.2.3 Heating mode transfers to cooling mode (dry mode), fan mode
a. The compressor stops.
b. The power of 4-way valve is cut off after 2min.
c. The outdoor fan stops after 1min.
d. The status of 4-way valve: energized.
3.3 Outdoor fan control in heating mode
The outdoor fan starts before 5s of the starting of compressor and then it will run in high speed for 40s.
The fan shall run at every speed for at least 80s.
When the compressor stops, the outdoor fan stops after 1min.
3.4 Defrosting function
When the defrosting condition is met, the compressor will stop
The electronic expansion valve of all indoor units open
The outdoor fan stops 40s after the of the stop of compressor
Meanwhile, the 4-way valve reverses the direction
After the 4-way valve reverses the direction, the compressor will start, then begin to calculate the time required for defrosting,
the frequency of the compressor will increase to reach the needed defrosting frequency.
3.5 Oil-returned control in heating mode
3.5.1 Oil-returned condition
The whole unit is operating in low frequency for a long time.
3.5.2 Oil-returned process in heating mode
The indoor unit displays “H1”
3.5.3 Oil-returned finished condition in heating mode.
The duration reaches 5min
Fan Mode
4.1 The compressor, the outdoor fan and the 4-way valve are closed; temperature setting range is 16~30OC.