V5 X VRF 50/60Hz
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1.2.2 Priority mode setting
Priority mode can only be set on the master unit. When an indoor unit is in mode conflict with the outdoor units the unit
displays the mode conflict error. If the indoor unit has a digital display, it will display error code E0; if the indoor unit
display board has LED indicators, the “DEF./FAN” LED will flash rapidly.
Figure 4-1.3: Indoor unit digital displays and LED indicators
There are five priority mode options:
1. Heating priority mode (default):
a) During cooling operation: If an indoor unit requests heating, the outdoor units stop and then restart in heating
mode after 5 minutes. Indoor units requesting heating then start in heating mode and indoor units requesting
cooling display the mode conflict error.
b) During heating operation: If an indoor unit requests cooling, the outdoor units ignore the request and continue
to run in heating mode. The indoor unit requesting cooling displays the mode conflict error. If all the indoor units
requesting heating are later turned off and one or more indoor units are still requesting cooling, the outdoor
units restart in cooling mode after 5 minutes and any indoor units requesting cooling then start in cooling mode.
2. Cooling priority mode:
a) During heating operation: If an indoor unit requests cooling, the outdoor units stop and then restart in cooling
mode after 5 minutes. Indoor units requesting cooling then start in cooling mode and indoor units requesting
heating display the mode conflict error.
b) During cooling operation: If an indoor unit requests heating, the outdoor units ignore the request and continue
to run in cooling mode. The indoor unit requesting heating displays the mode conflict error. If all the indoor units
requesting cooling are later turned off and one or more indoor units are still requesting heating, the outdoor
units restart in heating mode after 5 minutes and any indoor units requesting heating then start in heating
mode.
3. VIP priority mode or voting priority mode: 63 is the VIP address. If the VIP indoor unit is operating, the outdoor units
operate in the mode of the VIP indoor unit. Indoor units that are in a mode different to that of the VIP unit display the
mode conflict error. If there is no unit with address 63 or the unit at address 63 is in standby, the outdoor units
operate in voting priority mode. In voting priority mode, the outdoor units operate in whichever of heating and
cooling modes is being requested by the larger number of indoor units.
4. Heating only mode: The outdoor units only operate in heating mode. Indoor units requesting heating operate in
heating mode. Indoor units requesting cooling or in fan only mode display the mode conflict error.
5. Cooling only mode: The outdoor units only operate in cooling mode. Indoor units requesting cooling operate in
cooling mode; indoor units in fan only mode operate in fan only mode. Indoor units requesting heating display the
mode conflict error.
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