2WAY VRF SYSTEM
Control Functions
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6. Outdoor Unit CCU (command controller unit) Control
6. Outdoor Unit CCU (command controller unit) Control
2WAY VRF SYSTEM
Control Functions
RAP valve kit state (ON/OFF) is displayed on "D" in DSBE column when the Checker software is used.
0
：
OFF
1
：
ON
Indoor unit fan operated in the dry mode is controlled from the CCU as shown in the figure below.
In the case of special controls, the MOV performs a special operation.
For details, see “4. Output of PCB” under this section.
(2) RAP Valve Kit
(3) Indoor Fan Speed Control
Operating
mode of
indoor unit
The CCU intervenes in fan control of the indoor unit according to the status of the operating mode.
The priority order of fan control by the CCU is higher than that of indoor units.
Operating
mode of
outdoor unit
Operating
mode of
Compressor
Thermostat
ON/OFF
RAP valve kit ON/OFF
Stop
Cooling
Stop
Operation
Stop
Operation
Stop
Operation
Stop
Stop
Stop
OFF
OFF
ON
ON
Operation
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
Operation
Operation
Fan (only)
Cooling
Heating
Heating
Cooling
Cooling
Heating
Heating
3-1. Dry mode
Preset fan speed by remote controller
DTi
* DTi = ( Air intake temperature of indoor unit) - (Preset temperature by remote controller)
In the case of thermostat ON : “L”
Fan speed
In the case of thermostat OFF : “LL”
+ 1.8 deg F
(+1 deg C)
2WAY VRF SYSTEM
Control Functions
6. Outdoor Unit CCU (command controller unit) Control
3-2. Heating mode
The indoor unit fan in heating mode is stopped from the CCU in the following condition.
Discharge air temperature of indoor unit ≤ 68°F (20°C)
High pressure saturated temperature (HPT) in outdoor unit
≤ 77°F (25°C)
Liquid temperature (E1) in indoor unit ≤ 68°F (20°C)
EEPROM setting in main outdoor unit
CODE: 0C
Indoor unit
operation mode
Setting No.
0
1
2
4
6
7 (Factory
preset mode)
3
5
Movement of drain pump
Invalid
DP operates for 20 minutes and stops for 2 hours
DP operates for 20 minutes and stops for 20 minutes
DP always operates
DP operates for XX minutes when indoor unit's operation changes;
from thermostat ON or thermostat OFF → operation stopped.
DP operates for XX minutes when indoor unit's operation changes;
from thermostat ON → thermostat OFF or operation stopped.
All mode
Cooling mode
Dry mode
Heating mode
Cooling mode
Dry mode
Both Setting No. 4 and 5 functions.
DP operates for XX minutes when indoor unit's operation changes
from thermostat ON or thermostat OFF → operation stopped.
In the case of special controls, the MOV performs special operation.
For details, see “4. Special Control” under this section.
(4) Drain Pump Control
The CCU intervenes in drain pump control of the indoor unit according to the setting in EEPROM in the
outdoor unit.
The drain pump operates from the CCU control at the following condition.
DP counter ≥ 5
* The DP counter counts each oil recovery control, and 4-way Valve Adjustment Control in cooling operation.
Liquid temperature (E1) in the indoor unit which selected cooling mode < 32°F (0 °C)
* Regardless of operating / stopped mode
*
To activate this function, it is necessary to set EEPROM on the main outdoor unit PCB.
*
When any of setting No. 4 – 7 is selected, this function works only for the type of F2, M2, E1.
Low Silhouette Ducted type indoor unit
In Low Silhouette Ducted types, dirt might be accumulated when water collects in the drain pan for a long
term.
Therefore, the drain pump works longer to drain water surely.
SM830237-07_北米向け2WAY_VRF.indb 24
18/06/19 18:55:33
