Automatic Heating / Cooling Control - Panasonic U-4LE2E5 Service Manual & Test Run Service Manual

6. Automatic Heating / Cooling Control

6. Automatic Heating / Cooling Control

This function is only valid as long as one indoor unit is installed within one refrigerant system or all indoor
units are controlled within a group control.
When operating in a group control, the sub-indoor units become the same operation mode of the main unit.
As for the indoor units in a group control, install them in the same air conditioning circumstances.
Use the temperature sensor which is built-in sensor of the indoor unit.
1 When operation starts, heating or cooling is selected according to the set temperature and the room temperature.
Room temperature
Set temperature – 1 < Room temperature
Room temperature < Set temperature – 1
*1: If the difference between the room temperature and set temperature is small when operation starts, the cooling
thermostat remains in standby status (OFF) until the temperature difference increases. When the temperature
difference increases, either cooling operation or heating operation is selected. This standby status is known as
"monitoring mode."
2 After operation starts in the selected operating mode, the set temperature is automatically shifted by +2°C (*3) (cooling
operation) or –2°C (*3) (heating operation).
Example: Temperature set on the remote controller is 20°C.
Control temp. for cooling
Remote controller display
Control temp. for heating
3 Operating mode changes (heating
temperature changes are handled as shown below.
Heating cooling: Room temperature
Cooling heating: Room temperature
Example: Temperature set on the remote controller is 20°C.
Operating mode change
1 Heating → Cooling
2 Cooling → Heating
*2: Dur ing heating operation when the body sensor is used, a temperature shift is applied to the intake temperature
detected by the sensor, in consideration of the difference in temperature at the top and bottom of the room.
(Refer to the "Room Temperature Control" item.) If this intake shift temperature is 4°C, then the heating
change occurs when the temperature detected by the body sensor is 26.5°C or higher.
4 Cooling (heating) operation does not change if the room temperature changes from area C
minutes after the compressor turns OFF. (Monitoring mode is excepted.)
5 When the heating/cooling change
occurs, the 4-way valve switches
approximately 30 to 50 seconds
after the compressor turns ON.
*3: Correction temp. is different depending on the model.
See the right column [ Indoor item code "1E" ] under the section "14. Parameter".
Set temperature + 1 Cooling
Set temperature + 1
Heating
22˚C
20˚C
18˚C
cooling, cooling
Shifted set temperature (set temperature + 2°C (*3)) + 0.5°C
Shifted set temperature (set temperature – 2°C (*3)) – 1.0°C
Shifted set temp.
20 + 2 (*3) + 0.5 = 22.5°C or higher (*2)
20 – 2 (*3) – 1.0 = 17°C or lower
Selected operating mode
Control temp. for cooling
Remote controller display
Control temp. for heating
Selected operating mode
Control Functions - Indoor Unit
Monitoring mode (*1)
* 20°C (temperature set) + 2°C (*3)
* 20°C (temperature set) – 2°C (*3)
heating) which occur during operation as a result of
A
+3 deg
+2.5 deg
+2 deg
+1 deg
B
–1 deg
–2 deg
–3 deg
C
Thermostat ON
OFF ON
Heating
2 - 7
Mini VRF SYSTEM
cooling
A (or A C) within 10
OFF ON OFF ON OFF ON OFF ON
Cooling Heating
2