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W-2WAY ECO-i SYSTEM
Control Functions
4-3-3. Frost detection
(A) Frost detection does not occur for 5 minutes after operation starts.
(B) Frost is detected when either condition 1 or 2 below is met.
Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is
operating.
Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating.
4-3-4. Outdoor units where defrost occurs
Even if the total time has not reached 35 minutes, if there is 1 or more outdoor units that fulfills the defrost detec-
tion conditions, all operating outdoor units perform defrost control at the same time.
* Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as an
evaporator (such as stopped outdoor units).
4-3-5. Reverse Cycle Defrost
If there is 1 outdoor unit and no thermal storage tank in a refrigerant system, a reverse cycle defrost will be carried out.
• Defrost flow
E: Evaporator operation
C: Condenser operation
E
→
C: Switching from evaporator operation to condenser operation
C
→
E: Switching from condenser operation to evaporator operation
–25
–23
–10
The frost detection area is
located under the thick lines
L2
L1
–3
–21.4
–8
–1
10
10
External temperature
°
C
Heat exchange liquid temperature
°
C
Defrosting operation
end temperature
(The end temperature
is different from the
above detection
temperature.)
Cooling mode
indoor units
E
E
E
E
E
E
E
E
E
E
EE
C
E
→
CE
→
C
E
→
C
E
→
C
E
→
C
E
→
C
E
→
C
E
→
C
C
→
E
C
→
E
C
→
E
C
→
E
C
→
E
C
→
E
C
→
E
Outdoor unit status
Stopped indoor units
Indoor units where fan is operating
Heating mode
indoor units
Compressor
Time
Defrost preparation
Defrost in progress
Defrost end
Defrost
end
judgment
Stopped
Stopped
Operating
Operating
1 min
1 min
1 min
Max. 10 min
Thermostat ON
Thermostat ON
Thermostat OFF
Thermostat OFF
4. Special Controls
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