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

6. Indoor Units Control from CCU
6-1. MOV of Indoor Unit
6-1-1. MOV of each Indoor Unit Operation Mode
Mode of Outdoor unit
indoor unit (system)
Stop
Stop
Operating
Stop
Fan
Operating
Stop
Cooling Operating
Operating
Stop
Operating
Heating
Operating
Operating
* The meaning of outdoor unit "Operating" is functioning as a cooling or heating system at least more than one
compressor operating simultaneously.
*1 SH control adjusts the difference between the liquid temperature and gas temperature in indoor unit.
SH = gas temperature (E3) - liquid temperature (E1)
Target SH is 1 - 3 degrees when required level of indoor unit is "30" or "31(test run)".
Note: When the refrigerant amount in the system is adjusted, it is necessary to select test run that the required
level becomes "31".
*2 SC control adjusts the difference between the liquid temperature in indoor unit and condensation temperature
in a system (Tc).
SC = Condensation temperature (Tc) - liquid temperature (E1)
Target SC is 5 - 15 degrees according to operating condition.
*3 MOV pulse changes to 55 for 1 minute when valve pulse continues to be 55 or more 5 minutes.
The purpose is to decrease the flow volume of the refrigerant so that room temperature can be detected with
less influence of heat from the refrigerant.
*4 Only for High Static Pressure Ducted Type Indoor Unit (Type E1)
In case of special controls, MOV performs special operation. For detail, refer to the section "7. Tube Refrigerant
Recovery Control, 8. Oil Control, 9. Defrost Control".
Thermostat
ON/OFF
- 20 pulses
- 20 pulses
- 20 pulses
- 20 pulses
- 20 pulses
ON 60 - 480 pulses
OFF 20 pulses
- 20 pulses
ON 65 - 480 pulses
OFF 55 - 80 pulses
OFF *4 20 pulses
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Control Functions
(SH control *1)
(SC control *2)
(Accumulation prevention of refrigerant *3)
3WAY SYSTEM
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