Mini VRF SYSTEM
Control Functions - Outdoor unit
1 - 16
1
5. Outdoor Unit CCU (command controller
unit) Control
6. Outdoor Unit CCU (command controller unit) Control
2WAY VRF SYSTEM
Control Functions
When the refrigerant amount in the system is adjusted, it is necessary to select test run mode that the
required level becomes “31”.
Operating
mode of
indoor unit
Operating
mode of
outdoor unit
Operating
mode of
compressor
Thermostat
ON/OFF
MOV pulse of indoor unit
Stop
Cooling
Stop
Operation
Stop
Operation
Stop
Operation
Stop
Stop
Stop
OFF
OFF
ON
ON
Operation
20
20
85
65 ~ 80
(prevent remaining refrigerant )
20
20
85
20
85
20
55 ~ 80 (prevent remaining refrigerant,
suction temperature control*
2
)
60 ~ 480 (SH control*
1
)
65 - 480 pulses (SC control*
3
)
65 ~ 80
(prevent remaining refrigerant)
Operation
Operation
Fan (only)
Cooling
Heating
Heating
Cooling
Cooling
Heating
Heating
Some actuators of indoor unit are controlled by CCU.
(1)
1-1. Indoor unit without RAP valve kit
*1 SH control adjusts the difference between the liquid temperature and gas temperature in indoor unit.
unit : pulse
MOV of Indoor Unit
SH = gas temperature (E3) - liquid temperature (E1)
Target SH is 3 degrees Celsius when the load level of indoor unit is “30” or “31 (test run)”.
*3 SC control adjusts the difference in temperature between the liquid temperature in indoor unit and
high-pressure saturated temperature in outdoor unit.
SC = high-pressure sensor temperature (HPT) - liquid temperature (E1)
Target SC is 5 - 15 degrees Celsius according to the operating condition.
Target SH will be increased up to 17.5 degrees Celsius when the load level of indoor unit is low.
*2 MOV pulse changes to 55 for 1 minute when the MOV pulse continues to be 55 or more for 10 minutes.
The purpose of this control is to decrease the flow volume of the refrigerant so that room temperature can
be detected with less influence of heat from the refrigerant.
2WAY VRF SYSTEM
Control Functions
6. Outdoor Unit CCU (command controller unit) Control
Operating
mode of
indoor unit
Operating
mode of
outdoor unit
Operating
mode of
compressor
Thermostat
ON/OFF
MOV pulse of indoor unit
Stop
Cooling
Stop
Operation
Stop
Operation
Stop
Operation
Stop
Stop
Stop
OFF
OFF
ON
ON
Operation
20
20
20
20
20
20
20
20
20
20
20
60 ~ 480 (SH control*
1
)
65 - 480 pulses (SC control*
3
)
20
Operation
Operation
Fan (only)
Cooling
Heating
Heating
Cooling
Cooling
Heating
Heating
1-2. Indoor unit with RAP valve kit
Go to previous page and see the comments with asterisks *1 and *3.
In the case of special controls, the MOV performs a special operation.
For details, see “3. Special Control” under this section.
unit : pulse
SM830258-01_欧州向け_1fan_mini_VRF.indb 16 18/03/06 9:09:50
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