Explanation; Heating Priority Mode; Cooling Priority Mode - Midea MDV-D22Q1/N1-D Technical Manual

3.2.5 Explanation

There are five priority mode options, which are set on the outdoor units. If an indoor unit's operating mode
conflicts with that of the outdoor units, the indoor unit displays the mode conflict error. The five priority modes
are:
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.
34