Si30-408 Control of Indoor Unit
Basic Information 29
4.1.2 Thermostat-control in Normal Operation
As to VRV system, remote controller thermostat is set to use when shipped from factory.
Normally thermostat differential is set to setting temperature –1°C at cooling, while set to setting
temperature +1°C in heating when shipped from factory.
However, the unit can be controlled only by body-thermostat when using 1 group remote
controller. For cassette type indoor unit, the unit is controlled with compensation value of –2°C
against body-thermostat detection value in heating operation. (Thermostat - differential can be
changed from 1°C to 0.5°C with field setting. Refer to page 43 and page 44 for changing.)
4.1.3 Thermostat - control in Dry Operation
In dry operation, control is made based on suction temperature at the time of operation start.
Fan is driven with L flow rate during dry operation, and turned off for a period of 6 minutes
during thermostat-off, and then with L flow rate. (In order to prevent humidity from rising in the
room during thermostat-off.)
In cooling operation
Tr : Temperature detected by suction
air thermistor (R1T)
In heating operation
Normal operation Thermostat OFF
Tr < Preset temperature –1°C
Normal operation Thermostat OFF
Tr > Preset temperature +1°C
When Tro ≤ 24.5°C Tro : Suction air temperature at dry operation start
When Tro > 24.5°C Tr : Temperature detected by suction air thermistor (R1T)
In dry operation
Thermostat OFF
In dry operation
Thermostat OFF
Tr<Tro –1°C
Tr<Tro –1.5°C
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