4-2
4
4
4-1. Control Functions
1. Indoor Air Temperature Control
The thermostat is switched on and off in accordance with T shown below.
T= (Indoor air temperature) - (Temperature set with the remote controller)
In the body thermostat mode
(setting at factory shipment)
Indoor air temperature = (Body sensor) - (Shift temperature *)
In the remote controller thermostat mode Indoor air temperature = (Remote controller sensor)
* Shift Temperature
Only valid during heating operation. Set at 0 °C during cooling operation.
The settings at factory shipment during heating operation are as follows:
Wall-Mounted type : 2°C
Floor Standing type : 0°C
All other types (4-Way types, Concealed types, etc.) : 4°C
This function acts as the coefficient for adjusting differences in temperature caused by the height of the living
space from the floor to the ceiling (the temperature at ceiling height is higher) during heating operation.
The setting can be modified between 0°C and 6°C with mode [06] (Simple Settings Function) on the remote
controller.
(1) Once the thermostat has been switched on, it cannot be switched off again by indoor air temperature control for
a period of 10 minutes.
(2) Once the thermostat has been switched off, it cannot be switched on again for a period of 3 minutes.
(3) When in the test run operation mode, the thermostat will not be switched off by indoor air temperature control
and the operation will continue.
2. Compressor Frequency Control
The frequency of the compressor's inverter is limited by either of the following controls depending on whether the
cooling or heating mode is in operation.
Cooling Mode :
∙ Indoor air temperature control
∙ Maximum and minimum frequency control
∙ Current control
∙ Cooling high-load prevention control
∙ Cooling freeze prevention control
∙ Discharge temperature control
Heating Mode :
∙ Indoor air temperature control
∙ Maximum and minimum frequency control
∙ Current control
∙ Heating high-load prevention control
∙ Discharge temperature control
: Thermostat ON
: Thermostat OFF
Cooling Mode
Heating Mode
T
+ 1.0
- 1.0
0
T
+ 1.0
- 1.0
0
2) Maximum and Minimum Frequency Control
* There is a case in which the frequency set at maximum and minimum may sometimes decrease in accordance
with ambient temperature and indoor loads.
3) Current Control
Maximum Frequency (Hz)
Cooling
U-200PZH2E8
U-250PZH2E8
Heating
70
95
13
13
15
90
110
15
Minimum Frequency (Hz)
Cooling
Heating
Is (A)
Cooling
Heating
1) Indoor Air Temperature Control
By the control method, not only the thermostat is switched on and off, as explained section “1. Indoor Air
Temperature Control ”, but also the frequency of the compressor's inverter is controlled in accordance with
T and fluctuations in indoor air temperature. Inverter frequency is controlled as follows:
· Maximum and Minimum Frequency
When T is high (not yet reached the temperature set
with the remote controller).
Controlled so that the inverter frequency is increased.
When T is low (approxi1.0 or less in the
cooling mode or approximately -1.0 or more in the
heating mode).
Controlled so that the inverter frequency is decreased
or kept.
The compressor's inverter frequency is controlled in accordance with the model and operation mode.
The maximum and minimum frequencies for each model are shown in the table below.
* There are cases in which frequency is limited with other control functions depending on operational conditions,
so operations are not always carried out in accordance with the maximum frequencies listed below.
The inverter frequency is controlled so that the current value for the inverter compressor is less than the figure
listed in the table below in order to prevent abnormal increases in the inverter circuit located within the outdoor
unit's electrical box.
Current control with primary current : The limited values are modified in accordance with ambient temperature.
U-200PZH2E8
U-250PZH2E8
12.5
13.5
15.5
18.5
SM830276-00_欧州向け R32シングル TD＆SM.indb 2
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