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57
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9.3 Operation control function by the indoor control
(1) Auto operation (Heat recovery 3-pipe combination systems only)
Notes (1) Temperature range of switching cooling/heating mode can be changed by RC-EX3 from ±1.0 ±4.0.
(2) Room temperature control during auto cooling/auto heating is performed
according to the room temperature setting temperature. (DIFF: ±1 deg)
(3) If the indoor heat exchanger temperature rises to 59°C or higher during
heating operation, it is switched automatically to cooling operation. In
addition, for 1 hour after this switching, the heating operation is not
performed, regardless of the temperature shown at right.
Room temperature (Setting temperature)
+3 -3
Cooling operation
Room temperature (detected with Thi-A) [deg]
5956
Heating operation stopped (cooling)
Heating OK
Indoor heat exchanger temperature (°C)
Indoor return air temperature (℃)
Outdoor air temperature (℃)
24 2612 14 16 18 28 3020 22
12
26
24
22
20
18
16
14
30
28
Heating
Cooling
Forced thermostat OFF
Forced thermostat
OFF
Forced
thermostat OFF
Outdoor temperature/Heating
Outdoor temperature/Cooling
Cooling select temperature Heating select temperature
Setting temperature
(a) If “Auto” mode is selected by the remote control, the heating and the cooling are automatically switched according to
the difference between outdoor air temperature and setting temperature and the difference between setting temperature and
return air temperature. (When the switching of cooling mode heating mode takes place within 3 minutes, the compres-
sor does not operate for 3 minutes by the control of 3-minute timer.) This will facilitate the cooling/heating switching
operation in intermediate seasons and the adaptation to unmanned operation at stores, etc (ATM corner of bank).
(b) The following automatic controls are performed other than (a) above.
(i) Cooling or heating operation mode is judged according to the conditions of the "Judgment based on Setting temperature
+ Cooling select temperature and Indoor return air temperature" and the "Judgment based on Outdoor temperature".
1) In "Setting temperature - Cooling select temperature < Indoor return air temperature" and "Outdoor temperature/Cooling
< Outdoor return air temperature" ⇒ Operation mode: Cooling
2) "Setting temperature + Heating select temperature > Indoor return air temperature" and "Outdoor temperature/Heating
> Outdoor air temperature" ⇒ Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
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