3-WAY SYSTEM
Control Functions
1
- 6
1
3. Compressor Control
3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode
11.1
11.0
6.1
6.0
2.0
1.9
16.0
11.0
6.0
7.5
2.0
12.0
0
15
30
c
(1) For indoor units that are operating in Cooling mode, if one unit is selected for a test run, then the air
intake temperature difference (difference between the room temperature setting and indoor unit air intake
temperature) is ignored, and areas B and C are considered to be area A for control purposes. (This is used for
additional charging, test run checks, etc.)
For this reason, vapor may be discharged if the test run continues for a long period of time, however this does
not indicate a problem. In addition, the test run is canceled automatically after 1 hour.
(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
(3) For 6 minutes after the compressors start, area C is considered to be area B for control purposes.
(4) During special control, control of the compressor capacity according to Te is not performed.
(5) If the thermostat turns OFF while Te is within area C, the next time the compressor starts it may restart from a
lower capacity.
(6) When the area changes to area C, area C is considered to be area B for control purposes for the first 6
minutes, even if the horsepower is the minimum value within the range where capacity control is possible
(operation with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.
Horsepower increase
permitted
Horsepower decrease
Horsepower increase
permitted
Horsepower increase
prohibited
Area A
Area AB
Area B
Area C
Maximum requirement level [L]
* Depending on the maximum requirement level of the indoor unit, the judgment
temperatures for each area may vary as shown in the fi gure (example).
SM830188-00̲3WAY.indb 6
SM830188-00̲3WAY.indb 6
2011/03/01 11:55:16
2011/03/01 11:55:16
