Panasonic WU-216MF2U9 - Service Manual - Page 42

Frost Detection, 4. Reverse Cycle Defrost, Whole process

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99..DDeefrforostsCt oCnotrnotlrol 3WAY3WVRAFY SSYYSSTTEEMM Control Functions 9-3. Frost Detection (1) 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. Heat exchange liquid temperature °F (°C) Defrosting operation (The end temperature 59 (15) end temperature is different from the above detection temperature.) 1 -13 (-25) 50 (10) External temperature °F (°C) 30.2 (-1) L1 26.6 (-3) L2 2 17.6 (-8) 14 (-10) The frost detection area is located under the thick lines 3 4 -13.9 (-25.5) -17.5 (-27.5) 9-4. Reverse Cycle Defrost 5 Reverse cycle defrost is performed in systems where only 1 outdoor unit is connected to the refrigerant system. Special control : Reverse Cycle Defrost features one of the functions of special control. 9-4-1. Start of reverse cycle defrost When conditions of section "9-2" and "9-3" contents are satisfied, defrost control is started. 6 9-4-2. Simplified flow of reverse cycle defrost Whole process Reverse cycle defrost shall be performed as the flow mentioned below. 7 (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 8 (4) Normal operation 9 1 - 34

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3WAY VRF SYSTEM
Control Functions
1
- 34
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.
-13.9 (–25.5)
-17.5 (–27.5)
14 (–10)
The frost detection area is
located under the thick lines
L2
L1
26.6 (–3)
-13 (–25)
17.6 (–8)
30.2 (–1)
59 (15)
50 (10)
External temperature °F (°C)
Heat exchange liquid temperature °F (°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.