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2WAY SYSTEM
Control Functions-Outdoor Unit
1
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
indoor unit
Mode of
outdoor unit
Compressor Thermostat
ON/OFF
MOV pulse of indoor unit
Stop
Cooling
Stop
-
20
Operation
-
20
Heating
Stop
-
85
Operation
-
65- 80 pulses (Accumulation prevention of refrigerant)
Fan (only) Cooling
Stop
-
20
Operation
-
20
Heating
Stop
-
85
Operation
-
65- 80 pulses (Accumulation prevention of refrigerant)
Cooling
Cooling
Stop
-
20
Operation
OFF
20
ON
60 - 480 pulses (SH control
*1
)
Heating
Heating
Stop
-
85
Operation
OFF
55- 80 pulses
(Accumulation prevention of refrigerant,
Occasional room temperature detection control
*2
)
ON
65 - 480 pulses (SC control
*3
)
*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
indoor unit
Mode of
outdoor unit
Compressor Thermostat
ON/OFF
MOV pulse of indoor unit
Stop
Cooling
Stop
-
20
Operation
-
20
Heating
Stop
-
20
Operation
-
20
Fan (only) Cooling
Stop
-
20
Operation
-
20
Heating
Stop
-
20
Operation
-
20
Cooling
Cooling
Stop
-
20
Operation
OFF
20
ON
60 - 480 pulses (SH control)
Heating
Heating
Stop
-
20
Operation
OFF
20
ON
65 - 480 pulses (SC control)
In case of special controls, MOV performs special operation. For details, refer to Special Controls section.
5-2-3. Silent Mode
This unit includes 2 types of silent modes.
See the table under the section “5-2. Fan mode” for maximum fan mode in silent mode.
Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve
restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
CODE : 05
Silent mode
Setting No.
0
1
2
3
4
5
6
7
8
9
10
11
12
Mode
Invalidity (Factory preset mode)
Silent priority
Capacity priority
Controlled in moderation
External input to PCB
-
Necessary
Unnecessary
Unnecessary
Necessary
Unnecessary
Necessary
-
Silent mode Mode 1
Silent mode Mode 2
Silent mode Mode 1
Silent mode Mode 2
Silent mode Mode 1
Silent mode Mode 2
Silent mode Mode 1
Silent mode Mode 2
Silent mode Mode 1
Silent mode Mode 2
Silent mode Mode 1
Silent mode Mode 2
* The compressor capacity (frequency) is not limited.
However, the capacity of the compressor decreases by road map control because of the pressure caused by the
decreased fan speed of rotation.
* To activate this function, it is necessary to set it to each outdoor unit.
* When the setting is "external input to PCB necessary", this function works by short circuiting "SILENT" pins.
* When the setting is "external input to PCB unnecessary", this function always works.
* When the setting is "silent priority", max. fan mode is decided in the following formula.
* When the setting is "capacity priority", this function works excluding the following conditions.
* When the setting is "controlled in moderation", this function controls both "silent priority" and "capacity priority".
* When the setting is "controlled in moderation", this function controls both "silent priority" and "capacity priority".
Condition that silent mode interrupts
This function will be useful for nighttime in summer.
Thereof, “silent priority” fan mode is set within the temperature range of “capacity priority”.
Max. fan mode = 13 - ( 35 – Ambient temperature) / 2
Heat exchanger [condenser] of outdoor unit: Ambient temperature ≥ 38°C
Heat exchanger [evaporator] of outdoor unit: Ambient temperature ≤ 2°C
2WAY SYSTEM
5. Outdoor Fan Control
Control Functions-Outdoor Unit
SM830204-05_2WAY SYS.indb 19
2015/01/21 17:00:01
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