MXS Service Manual
Table Of Contents
Control Specification SiUS121736EA
105 Functions and Control
Details The following are the examples of electronic expansion valve control which function in each
operation mode.
1: When all the indoor units are operating, liquid pipe temperature control is conducted.
2: SC (subcooling) control is conducted for the operating indoor units, when some of the units are not operating.
3: Liquid pipe temperature control for stopped room is conducted for the non-operating indoor units.
Fully closed when power is turned on
Open control when starting
(Control of target discharge pipe
temperature)
Control when the operating room is
changed
(Control of target discharge pipe
temperature)
Pressure equalizing control
Open control when starting
(Control of target discharge pipe
temperature)
Control when the operating room is
changed
(Control of target discharge pipe
temperature)
(Defrost control)
Pressure equalizing control
Open control when starting
Continue
Pressure equalizing control
Operation pattern
(R21181)
When power is turned on
Cooling, 1 room operation
Cooling, 2 rooms operation to
Cooling, 4 rooms operation
Stop
Heating, 1 room operation
Heating, 2 rooms operation
Stop
Heating operation
Discharge pipe thermistor
disconnection control
Stop
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+2
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+2
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+2
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+1
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+1
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+3
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+3
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+3
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Gas pipe isothermal control
SC (subcooling) control
Control when the frequency changes
Control for abnormally high discharge
pipe temperature
Oil recovery control
Indoor freeze-up protection control
Liquid pipe temperature control
Liquid pipe temperature control for
non-operating units
Dew prevention control for indoor rotor
z : Available
— : Not available