Panasonic U-8MF2E8 - Reverse Cycle Defrost

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3WAY SYSTEM
Control Functions
1
9. Defrost Control
9-3. Frost Detection
9-4. Reverse Cycle Defrost
(1)
9-4-1. Start of Reverse Cycle Defrost
9-4-2. Simplified Flow of Reverse Cycle Defrost
Reverse cycle defrost is performed in systems where only 1 outdoor unit is connected to the refrigerant system.
Frost detection does not occur for 5 minutes after operation starts.
(2) 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.
–25.5
–27.5
–10
The frost detection area is
located under the thick lines
L2
L1
–3
–25
–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.)
When conditions of section “9-2” and “9-3” contents are satisfied, defrost control is started.
Whole process
Reverse cycle defrost shall be performed as the flow mentioned below.
(0) Normal operation
(1) Pre-processing time of reverse cycle defrost for 2.5 minutes
(2) Reverse cycle defrost processing time*
1
(3) Post-processing time of reverse cycle defrost for 2 minutes
(4) Normal operation
Special control : Reverse Cycle Defrost features one of the functions of special control.
SM830226-003WAYECO-iSYSTEM.in3333SM830226-003WAYECO-iSYSTEM.in3333 2013/02/1311:52:282013/02/1311:52:28