Panasonic U-4LE1E5, Service Manual, Page: 20 / 133

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1
Mini VRF SYSTEM
Control Functions
(1)
(2)
*
(1)
(2)
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
All indoor units
All indoor units
Thermostat ON
Thermostat OFF
Fixed pulses for cooling, corresponding to
the indoor unit capacity
480
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Fixed pulses, corresponding to the indoor
unit capacity
Thermostat OFF
Thermostat ON
Heating
4-way valve
switching control
Reverse cycle
start control
Heating
Heating
Heating
Cooling / Heating
Heating
Inter systems
refigerant oil
recovery control
Reverse cycle
defrost control
OFF
Fan
OFF
Fan
8. Indoor Unit Electronic Control Valve (Motor Valve) Control
9. Indoor Special Control
SM830195-01̲Mini VRF SYS.indb 14 SM830195-01̲Mini VRF SYS.indb 14 2011/12/20 16:31:04 2011/12/20 16:31:04