2WAY SYSTEM
Control Functions
-
Outdoor Unit
1 - 20
1
6. Indoor Units Control from the CCU
6-2. RAP valve kit
The RAP valve kit connection might be required on the Type E1 indoor unit.
Mode of
indoor unit
Mode of
outdoor unit
Compressor Thermostat
ON/OFF
RAP valve kit
Stop Cooling Stop - OFF
Operation - OFF
Heating Stop - OFF
Operation - OFF
Fan (only) Cooling Stop - OFF
Operation - OFF
Heating Stop - OFF
Operation - OFF
Cooling Cooling Stop - OFF
Operation OFF OFF
ON OFF
Heating Heating Stop - OFF
Operation OFF OFF
ON ON
*RAP valve kit state (ON/OFF) is displayed on "D" in DSBE column when the Checker software is used.
0：OFF
1：ON
In case of special controls, RAP valve kit performs special operation. For details, refer to Special Controls
section.
6-3. Indoor Fan Speed Control
CCU intervenes in fan control of the indoor unit according to the state at the operating mode below.
The priority order of fan control by CCU is higher than that of indoor units.
6-3-1. Dry mode
Indoor unit fan operated in the dry mode is controlled from CCU as shown in the below figure.
+1
Fan speed is “L” when thermostat ON
Fan speed is “LL” when thermostat OFF
Fan speed set by remote controller
DTi = (Intake temperature of indoor unit) - (Preset temperature in remote controller)
2WAY SYSTEM
Control Functions-Outdoor Unit
6. Indoor Units Control from the CCU
6-4. Drain Pump control
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 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 < 0°C
* Regardless of operating / stopped.
- 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.
* To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB.
EEPROM setting of drain pump in main outdoor unit
CODE: 0C
Indoor unit under this controlSetting No.
0Invalid
All units
(Mode, Operation / Stop
Thermostat ON / OFF
doesn't concern)
1 DP operates for 20 minutes and stops for 2 hours
2 DP operates for 20 minutes and stops for 20 minutes
3 DP always operates
4 DP operates for XX minutes when indoor unit's operation
changes;
from thermostat ON → thermostat OFF or operation
stopped.
Cooling mode
Dry mode
Heating mode
5 DP operates for XX minutes when indoor unit's operation
changes;
from thermostat ON or thermostat OFF → operation
stopped.
6 Both Setting No. 4 and 5 functions.
7
(Factory
preset
mode)
DP operates for XX minutes when indoor unit's operation
changes
from thermostat ON or thermostat OFF → operation
stopped.
Cooling mode
Dry mode
*When setting No. 4 – 7 is selected, this function works only for below indoor unit types.
Types : F1, F2, M1, E1
*Operating time mentioned “XX” above is able to set in EEPROM of the main outdoor unit
Indoor unit fan run in the heating mode is stopped from CCU at the following conditions.
6-3-2. Heating mode
Discharge air temperature of indoor unit ≤ 20°C
Liquid temperature (E1) in indoor unit ≤ 20°C
High pressure sensor temperature (HPS) in outdoor unit ≤ 25°C
SM830204-05_2WAY SYS.indb 20 2015/01/21 17:00:01
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