Indoor Units Control From The Ccu - Panasonic U-8ME1E81 Service Manual

6. Indoor Units Control from the CCU

Some components of indoor unit are under CCU's control.
6-1. MOV of indoor unit
6-1-1. Indoor unit without RAP valve kit
Mode of Mode of
indoor unit outdoor unit
Stop Cooling
Heating
Fan (only) Cooling
Heating
Cooling Cooling
Heating Heating
*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 deg when required level of indoor unit is "30" or "31(test run)".
Target SH will be increased up to 20 deg when required level of indoor unit is small.
*When the refrigerant amount in the system is adjusted, it is necessary to select test run that the required
level becomes "31".
*2 MOV pulse changes to 55 for 1 minute when valve pulse continues to be 55 or more for 10 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.
*3 SC control adjusts the difference between the liquid temperature in indoor unit and high-pressure sensor
temperature in outdoor unit.
SC = high-pressure sensor temperature (HPS) - liquid temperature (E1)
Target SC is 5 - 15 deg according to operating condition.
6-1-2. Indoor unit with RAP valve kit (Mainly Type E1)
Mode of Mode of
indoor unit outdoor unit
Stop Cooling
Heating
Fan (only) Cooling
Heating
Cooling Cooling
Heating Heating
In case of special controls, MOV performs special operation. For details, refer to Special Controls section.
Compressor Thermostat
ON/OFF
Stop -
Operation -
Stop -
Operation -
Stop -
Operation -
Stop -
Operation -
Stop -
Operation OFF
ON
Stop -
Operation OFF
ON
Compressor Thermostat
ON/OFF
Stop -
Operation -
Stop -
Operation -
Stop -
Operation -
Stop -
Operation -
Stop -
Operation OFF
ON
Stop -
Operation OFF
ON
Control Functions-Outdoor Unit
MOV pulse of indoor unit
20
20
85
65- 80 pulses (Accumulation prevention of refrigerant)
20
20
85
65- 80 pulses (Accumulation prevention of refrigerant)
20
20
60 - 480 pulses (SH control
85
55- 80 pulses (Accumulation prevention of refrigerant,
Occasional room temperature detection control
65 - 480 pulses (SC control
MOV pulse of indoor unit
20
20
20
20
20
20
20
20
20
20
60 - 480 pulses (SH control)
20
20
65 - 480 pulses (SC control)
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