Fujitsu AUXB04GALH Service Manual page 45

(3) Priority mode
The purpose of the priority mode is to restrict operation commands (heating, cooling) from the
connected outdoor air units. There are 3 priority modes of Neutral, Cooling Priority, and Heating Priority.
The operation modes restricted by each of these modes are as follows:
Priority mode
Neutral
Cooling priority
Heating priority
1. Priority mode decision methods
Method 1. (Default value)
The initial priority mode is made Neutral and is shifted to Cooling Priority when cooling and to Heating
Priority when heating depending on which operation mode (cooling, heating) was input first.
After shifting to Cooling Priority or Heating Priority, the priority mode shifts to Neutral only when there
was a Stop input from all the indoor units.
Cooling priority
Method 2. (Management by Outdoor unit)
Operation mode management is made "Management by Outdoor unit" by Outdoor unit PUSH-SW
(field setting).
The priority mode shifts to Cooling Priority or Heating Priority in accordance with input from the Outdoor
unit regardless of the current mode.
Cooling priority
Method 3. (Management by indoor unit)
Operation mode management is made "Management by indoor unit" by Outdoor unit PUSH-SW
(field setting).
Then the master indoor unit is set by wired remote controller.
Thereupon the priority mode shifts to Cooling Priority or Heating Priority in accordance with input
from the master indoor unit regardless of the current priority mode.
The priority mode is fixed at either cooling or heating even if the master indoor unit stops
Cooling/Heating switching can be performed by the master indoor unit only.
Cooling priority
(4) Opposite operation mode
When the operation mode commanded from an indoor unit (remote controller) and the operation mode
allowed by the system (cooling and dry operation for cooling only type and operation mode allowed by
priority mode for heat pump type) do not match, it is indicated by blinking of an LED.
Timer lamp: 3 secs ON/1 sec OFF repeated
Restricted operation mode
No restrictions
Heating
Cooling
Neutral
Heating priority
Heating priority
Heating priority
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