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* Depending on the maximum requirement level of the indoor unit, the judgement
temperatures for each area may vary as shown in the figure.
(1)
(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
(3)
(4)
(5)
(6) When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min-
utes, even if the horsepower is the minimum value within the range where capacity control is possible (opera-
tion with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.
3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode
51.9
51.8
41.1
41.0
35.6
35.4
Horsepower decrease
Horsepower increase
prohibited
Horsepower increase
permitted
Horsepower increase
permitted
Area A
Area AB
Area B
Area C
60.8
53.6
51.8
45.5
41.0
35.6
Maximum requirement level [L]
0
15
30
For indoor units that are operating in Cooling Mode, if one unit is selected for a test run mode, the room temper-
ature control by the set temperature cannot be performed. Areas B and C are assumed to be area A for control
purposes, instead. By this reason, the compressor continues its operation regardless of the low evaporation
temperature (This is used for additional charging of refrigerant, test run checking etc.) Vapor may be discharged
if the test run continues for a long time. However, this does not indicate problems.
If the thermostat turns OFF while Te is within area C, the next time the compressor starts it may restart from a
lower capacity.
For 6 minutes after the compressors start, area C is considered to be area B for control purposes.
During special control, control of the compressor capacity according to Te is not performed.
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3. Compressor Control
W-2WAY ECO-i SYSTEM
Control Functions