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1.2 Modes Set on Main PCB
1.2.1 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. The digital display on indoor main PCB will display error code E0.
Figure 4-1.2: Indoor unit digital displays
There are five priority mode options:
1. Auto priority mode (default): In auto priority mode, the outdoor unit will operate in heating priority mode or cooling
priority mode according to the outdoor ambient temperature.
a)
When the outdoor ambient temperature is below 13
heating priority mode does not change until the outdoor ambient temperature is above 18
b)
When the outdoor ambient temperature is above 18
cooling priority mode does not change until the outdoor ambient temperature is below 13
c)
When the outdoor unit restarts under the outdoor ambient between 13
same priority as before the last stop.
d)
When the outdoor unit is initial startup under outdoor ambient temperature between 13
outdoor unit runs in heating priority mode.
1.1. Heating priority mode:
a)
During cooling operation: If an indoor unit requests heating, the outdoor unit stops and then restarts 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 unit ignores the request and continues
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 unit
restarts in cooling mode after 5 minutes and any indoor units requesting cooling then start in cooling mode.
1.2. Cooling priority mode:
During heating operation: If an indoor unit requests cooling, the outdoor unit stops and then restarts in cooling
a)
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 unit
restarts in heating mode after 5 minutes and any indoor units requesting heating then start in heating mode.
2. Cooling priority mode: refer to above "1.2. Cooling priority mode" descriptions.
Digital display
Figure 4-1.3: Auto priority mode control
Outdoor ambient temperature
Cooling priority
18
o
C
13
C
o
C, the outdoor units run in heating priority mode. The
o
o
C, the outdoor units run in cooling priority mode. The
o
Heating priority
56
Digital display
C.
o
o
C.
C and 18
C, the outdoor unit runs the
o
o
C and 18
o
C, the
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