-
103
-
'17 • PAC-T-256
(25) Fan control at heating startup
(a) Starting conditions
At the start of heating operation, if the difference of setting temperature and return air temperature is 5°C or higher after
the end of hot start control, this control is performed.
(b) Contents of control
(i) Sampling is made at each minute and, when the indoor unit heat exchanger temperature (detected with Thi-R) is
37°C or higher, present number of revolutions of indoor unit fan speed is increased by 10 min
-1
.
(ii) If the indoor unit heat exchanger temperature drops below 37°C at next sampling, present number of revolutions of
indoor unit fan speed is reduced by 10 min
-1
.
(c) Ending conditions
Indoor fan speed is reduced to the setting airflow volume when the compressor OFF is established and at 30 minutes after
the start of heating operation.
(26) Room temperature detection temperature compensation during heating
With the standard specification, the compressor is turned ON/OFF with the thermostat setting temperature. When the thermostat
is likely to turn OFF earlier because the unit is installed at the ceiling where warm air tends to accumulate, the setting can be
changed with the wired remote control indoor unit function “
”. The compressor and the heater are turned ON/OFF at
one of the setting tempe3, +2 or +1°C in order to improve the feeling of heating. The setting temperature, however, has
the upper limit of 30°C.
Compressor
Compressor
Standard
Operation
Stop
Setting temperature
-1
+1
Room temperature (deg)
Operation
Stop
Setting temperature
+2
+4
Room temperature (deg)
When it is set at +3°C
(27) Return air temperature compensation
This is the function to compensate the deviation between the detection temperature by the return air temperature thermistor and
the measured temperature after installing the unit.
(a) It is adjustable in the unit of 0.5°C with the wired remote control indoor unit function “RETURN AIR TEMP”.
• +1.0°C, +1.5°C, +2.0°C
• -1.0°C, -1.5°C, -2.0°C
(b) Compensated temperature is transmitted to the remote control and the compressor to control them.
Note (1) The detection temperature compensation is effective on the indoor unit thermistor only.
(28) High power operation (RC-EX3 only)
It operates at with the set temperature. fixed at 16
°C for cooling, 30°C for heating and maximum indoor fan speed for 15
minutes maximum.
(29) Energy-saving operation (RC-EX3 only)
It operates with the setting temperature fixed at 28°C for cooling, 22°C for heating or 25°C for auto. When fan control in
cooling/heating thermo-OFF setting is "Set fan speed", fan speed during thermo-OFF is changed to "Low"(Maximum capacity
is restricted at 80%.)
(30) Warm-up control (RC-EX3 only)
Operation will be started 5 to 60 minutes before use according to the forecast made by the microcomputer which calculates
when the operation should be started in order to warm up the indoor temperature near the setting temperature at the setting time
of operation start.
(31) Home leave mode (RC-EX3 only)
When the unit is not used for a long period of time, the room temperature is maintained at a moderate leval, avoiding extremely
hot or cool temperature.
(a) Cooling or heating is operated according to the outdoor temperature (factory setting 35°C for cooling, 0°C for heating)
and the setting temperature. (factory setting 33°C for cooling, 10°C for heating)
(b) Setting temperature and indoor fan speed can be set by RC-EX3.
