1 - 23
3WAY SYSTEM
Control Functions
1
6. Indoor Units Control from CCU
* 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
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”.
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)
6-1. MOV of Indoor Unit
6-1-1. MOV of each Indoor Unit Operation Mode
Mode of
indoor unit
Stop
20 pulses
20 pulses
Fan
20 pulses
20 pulses
Cooling
20 pulses
60 - 480 pulses (SH control *1)
20 pulses
Heating
20 pulses
65 - 480 pulses (SC control *2)
Outdoor unit
(system)
Stop
Operating
Stop
Operating
Stop
Operating
Operating
Stop
Operating
Operating
Operating
Thermostat
ON/OFF
-
-
-
-
-
ON
OFF
-
ON
OFF
OFF *4
55 - 80 pulses
20 pulses
(Accumulation prevention of refrigerant *3)
SM830226-003WAYECO-iSYSTEM.in2323SM830226-003WAYECO-iSYSTEM.in2323 2013/02/1311:52:262013/02/1311:52:26
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