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Mini VRF SYSTEM

Control Functions

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8-2. During Special Control

9. Indoor Special Control

9-1. Indoor Unit Thermostat ON/OFF Delay Timer

9-2. Indoor Unit Refrigerant Oil Self-recovery Control

This control is performed constantly during Cooling mode operation only.

When an indoor unit thermostat turns ON, the thermostat cannot be turned OFF by the room temperature

thermostat discharge temperature thermostat for 3 minutes.

However, if the condensation temperature (refrigerant temperature detected at the condenser) reaches PX

temperature or higher, the thermostat may turn OFF in order to prevent excessive loads.

When an indoor unit thermostat turns OFF, it will not turn ON again for a minimum of 3 minutes.

The electronic control valve at indoor units that are stopped, or are in Fan mode or in Cooling mode with ther-

mostat OFF, opens for 1 – 2 minutes.

At indoor units that are in Cooling mode with thermostat ON, the electronic control valve opens from its current

position by approximately 20 pulses.

Control type Operating mode Target indoor units Electronic control valve position (pulses)

Cooling

All indoor units

Thermostat ON

Thermostat OFF

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