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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
* 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).
• 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
–13
–9
14
L2
L1
26
–6.5
17
30
50
50
Heat exchange liquid temperature °F
Defrosting operation
end temperatur
e
(The end temperature
is different from the
above detection
temperature.)
E
E
E
E
E
E
E
E
E
E
C
Stopped Stopped
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.
External temperature °F
The frost detection area is
located under the thick lines
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.
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.
Outdoor unit status
Stopped indoor units
Indoor units where fan is operating
Cooling mode
indoor units
Heating mode
indoor units
Thermostat ON
Thermostat OFF
Thermostat ON
Thermostat OFF
Compressor
Time
Operating
Operating
Max. 10 min
Defrost
end
judgment
Defrost preparation
Defrost in progress
Defrost end
1 min
C E
E
E
C E
C E
C E
C E
C E
E C
C E
E C
E C
E C
E C
E C
E C
1 min
1 min
E C
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W-2WAY ECO-i SYSTEM
Control Functions
4. Special Controls