Indoor Units Control From The Ccu - Panasonic U-8MF2E8 Service Manual

6. Indoor Units Control from CCU
6-2. Solenoid Valve Kit Control [SVK]
This device connects the solenoid valve kit which is used to switch between indoor unit cooling/heating for 3-WAY
types.
In case of special controls, solenoid valve kit performs special operation.
For detail, refer to the section "7. Tube Refrigerant Recovery Control, 8. Oil Control, 9. Defrost Control".
6-2-1. SVK of each Indoor Unit Operation Mode
1
Mode of Outdoor unit
indoor unit
Operating
Stop
Operating
Operating
Operating
Fan
Operating
Operating
Cooling Operating
Operating
Operating
Heating
Operating
Operating
*1 When the outdoor unit is stopped, all valves of indoor units' solenoid valve kit in the heating mode are closed.
Next, when the cooling or heating operation is resumed, the valves will be opened.
*2 Function when a common use solenoid valve kit is used and there are more than one (1) indoor unit in the cooling
mode within the same solenoid valve kit.
*3 Function when a common use solenoid valve kit is used and there are more than one (1) indoor unit in the heating
mode within the same solenoid valve kit.
*4 Only for High Static Pressure Ducted Type Indoor Unit (Type E1)
Checker software shows DSBE as the solenoid valve kit status of "0" and "1" instead of "OFF" and "ON" individually.
0 : OFF
1 : ON
6-3. Indoor Fan Speed Control
CCU intervenes in fan control of the indoor unit according to the state at the operating mode below.
The priority order of fan control by CCU is higher than that of indoor unit's.
In case of special controls, indoor fan performs special operation.
For detail, refer to the section "7. Tube Refrigerant Recovery Control, 8. Oil Control, 9. Defrost Control".
6-3-1. Stop
When the outdoor unit is operating and cooling or heating thermostat ON is changed to OFF, the indoor unit fan
stops after 1 minute drive with air speed "L".
Thermostat
(system) ON/OFF
Stop -
-
*2 (Cooling)
*3 (Heating)
Stop -
-
*2 (Cooling)
*3 (Heating)
Stop -
ON
OFF
Stop -
ON
OFF
OFF *4
Discharge Suction
valve valve
(D) (S)
OFF OFF
OFF OFF
OFF ON
ON OFF
OFF OFF
OFF OFF
OFF ON
ON OFF
OFF OFF
OFF ON
OFF ON
OFF OFF
ON OFF
ON OFF
OFF OFF
1 - 24
3WAY SYSTEM
Control Functions
Balance EP
valve valve
(B) (E)
ON/OFF *1 OFF
ON OFF
ON ON
OFF OFF
ON OFF
ON OFF
ON ON
OFF OFF
ON OFF
ON ON
ON ON
ON/OFF *1 OFF
OFF OFF
OFF OFF
OFF OFF