Indoor Special Control - Panasonic U-4LE1E5 Service Manual

8. Indoor Unit Electronic Control Valve (Motor Valve) Control

9. Indoor Special Control

8-2. During Special Control
Control type Operating mode
4-way valve
switching control
Reverse cycle
start control
Inter systems
refigerant oil Cooling / Heating
recovery control
Reverse cycle
defrost control

9. Indoor Special Control

9-1. Indoor Unit Thermostat ON/OFF Delay Timer
(1) 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.
(2) When an indoor unit thermostat turns OFF, it will not turn ON again for a minimum of 3 minutes.
9-2. Indoor Unit Refrigerant Oil Self-recovery Control
* This control is performed constantly during Cooling mode operation only.
(1) 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.
(2) At indoor units that are in Cooling mode with thermostat ON, the electronic control valve opens from its current
position by approximately 20 pulses.
Target indoor units
Thermostat ON
Cooling
Thermostat OFF
Cooling
OFF
Fan
Heating All indoor units
OFF
Fan
Heating
Thermostat ON
Heating
Thermostat OFF
All indoor units
OFF
Fan
Heating
Thermostat ON
Heating
Thermostat OFF
Electronic control valve position (pulses)
Performs SH control
20
20
20
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
1 - 15
Mini VRF SYSTEM
Control Functions
1