YMGI WMMS-30CH-V2B(59)5, Руководство по обслуживанию, Страница: 33 / 81

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2. Protection Functions
2.1 Mode Conflict Protection of indoor unit
When the setting mode is different of different indoor unit, the unit runs in below status:
a. Check to see if the mode of the first operating indoor unit is set to heating or cooling. Check the mode of the
other indoor units to see if there is a conflict. Cooling mode (or dehumidify mode) is in conflict with heating
mode.
b. Fan mode conflicts with heating mode, and the heating mode is the basic mode. No matter which indoor unit
operates first, the unit will run in heating mode.
2.2 Overload protection function
When the tube temperature is measured as a low, the compressor raises the operation speed; when the tube temperature
is a high, the compressor speed is restricted or slows down the operation speed; when the tube temperature is too high,
the compressor protection stops running.
If the discharge temperature protection is triggered 6 times, the compressor will shut down and will not resume running. The
compressor will resume running after shutting off power to the unit, and then turning the power back on. If the compressor
can continuously run for longer than 7min, the protection time record will be cleared.
2.3 Discharge Protection Function
When the discharge temperature is a low, the compressor raises the operation speed; when the discharge temperature is
a high, the compressor speed is restricted or slows down the operation speed; when the discharge temperature is too
high, the compressor protection prevents the compressor from running.
If the discharge temperature protection is triggered 6 times, the compressor will shut down and will not resume running. The
compressor will resume running after shutting off power to the unit, and then turning the power back on. If the compressor
can continuously run for longer than 7min, the protection time record will be cleared.
2.4 Communication malfunction
Detection of the quantity of installed indoor units:
After 3 min of energizing, if the outdoor unit does not receive any communication data of each indoor unit, the outdoor unit
will decide that indoor unit is not installed and will treat it as it is not installed. If the outdoor unit receives the communication
data from that indoor unit later, the outdoor unit will treat that unit as it is installed.
2.5 Overcurrent Protection
Overcurrent protection will be triggers under the following conditions
a. Overcurrent protection of complete unit
b. phase wire current protection
c. compressor phase current protection
2.6 Compressor high-pressure protection
2.6.1 When the high-pressure switch is detected as cut off for 3s continuously, the compressor will enter high-pressure
protection and stop running when it reaches a
set temperature. Meanwhile, the outdoor unit will send the signal of “high-
pressure
protection” to the indoor units.
2.6.2 High-pressure protection is triggered when the high-pressure switch is detected closed for 6s continuously. The
compressor can only resume operation after the power to the unit is shut down, and then turned back on again.