Fujitsu UTB-GCA Operating Manual page 37

Notes
* Cannot be set in HEAT PUMP TYPE refrigerant system.
** Cannot be set in COOLING ONLY TYPE refrigerant system.
When a group is comprised of indoor units which are in different types of refrigerant systems (HEAT
RECOVERY TYPE / HEAT PUMP TYPE / COOLING ONLY TYPE), it is still possible to do an operating
mode setting for the group. However, the newly set operating mode will be conducted only by those
remote control groups in the group, when the newly set operating mode can be conducted by them.
When a heating operation mode is attempted on a cooling only type refrigerant system, the central
control number will flash and the set operating mode will not be conducted. This occurs when a group
comprised of indoor units with different types of refrigerant systems (heat recovery type / cooling &
heat pump type / cooling only type). Actually, the operating command is sent to the relevant indoor
units, but the command will not be conducted by those indoor units when the set operating mode is not
permitted by the type of refrigerant system where they exist.
About operating modes
AUTO ..COOLING MODEL
• When the room temperature is 2 °C higher than the set tempera-
ture, the operating mode will switch between Cooling and Drying.
• During the Drying mode operation, the FAN setting should be
switched to LOW for a gently cooling effect during which the fan
may temporarily stop rotating.
• If the mode automatically selected by the unit is not satisfactory,
see above and change the mode setting (COOL , FAN).
AUTO (AUTO CHANGE OVER) ..HEAT&COOL MODEL (Reverse cycle)
• When AUTO CHANGE OVER is selected, the air conditioner selects the appropriate operating
mode (Cooling or Heating) according to the real room temperature.
• When AUTO CHANGE OVER is first selected, the fan will operate at very low speed for about one
minutes while the unit determines the current conditions of the room and accordingly selects the
proper operation mode.
• When the air conditioner has adjusted the room temperature to near the thermostat setting, it will
being monitor operation. In the monitor operation mode, he fan will operate at low speed. If the
room temperature subsequently changes, the air conditioner will select the appropriate operation
(Heating, Cooling) once again to adjust the temperature to the value set with the thermostat. (The
monitor operation range is ±2 °C relative to the thermostat setting.)
• If the mode automatically selected by the unit is not satisfactory, see above and change the mode
setting (HEAT, COOL, FAN).
• Do not select AUTO CHANGE OVER if the difference in the environmental temperature of the
master and slave units is over 2 °C. (Otherwise, the indoor fan may not be controlled correctly.)
Heating
• Use to warm your room.
• When Heating mode is selected, the air conditioner will operate at very low fan speed for about 3
to 5 minutes, after which it will switch to the selected fan speed setting. This period of time is
provided to allow the indoor units to warm up before a full operation.
• When the room temperature is very low, frost may form on the outdoor unit, therefore, the perfor-
mance of the outdoor unit will decrease. In order to remove such frost, the unit will automatically
enter the defrost cycle from time to time. During defrosting, the heating mode will be temporarily
interrupted
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will be shown on the remote controller display.
Cooling Operation
Dry Operation
Thermostat control
2 °C
Setting temperature