Indoor Special Control - Panasonic U-10MF1E8 Service Manual

12. Indoor Special Control

12-1. Switching Control (EC control)
If the settings indicate that an RAP valve kit is present (for type E1, the setting on initial shipment from the factory
is "present"), then the thermostat does not turn ON for 3 minutes after the indoor unit operating mode is changed
from any mode other than heating (including stopped) to heating with thermostat ON. This is done in order to bal-
ance the pressure within the heat exchanger.
* With type E1, this control is activated after defrost control is completed, turning the thermostat OFF for 3 minutes.
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12-2. Indoor Unit Thermostat ON/OFF Delay Timer
(1) After the thermostat turns ON at an indoor unit, the thermostat will not be turned OFF by the room temperature
thermostat or discharge temperature thermostat for a period of 3 minutes.
However, if the condensation temperature reaches or exceeds the PX temperature, the thermostat turns off in
order to prevent overload.
(2) After the thermostat turns OFF at an indoor unit, the thermostat will not turn ON again for a minimum of 3 minutes.
12-3. Indoor Unit Refrigerant Oil Self-Recovery Control
This control is performed periodically only during cooling operation.
(1) At indoor units which are stopped, operating in fan mode, or where the thermostat is OFF, the electronic control
valve is opened for 1 – 2 minutes.
(2) At indoor units where the thermostat is ON, the electronic control valve position is opened by 10 pulses from
the current position.
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3-WAY SYSTEM
Control Functions