Sanyo CHDXR09663* Service Manual page 11

3. Compressor Control
3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode
°F
51.9
51.8
1
41.1
41.0
35.6
35.4 Horsepower decrease
* Depending on the maximum requirement level of the indoor unit, the judgement
temperatures for each area may vary as shown in the figure.
(1) 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.
(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 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.
Horsepower increase
permitted
Area A
Horsepower increase
Area AB
permitted
Horsepower increase
Area B
prohibited
Area C
60.8
53.6
51.8
45.5
0 15
Maximum requirement level [L]
1 - 6
W-2WAY ECO-i SYSTEM
Control Functions
41.0
35.6
30