Technibel CAFP 124 R - Page 86

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Defrost control
(1) Frost detection
1. Outdoor heat exchanger temperature (C1) method
(15-minute mask after operation start)
2. Outdoor air temperature is –13°C or above and outdoor heat
exchanger temperature (C1) of –18°C or below is detected continu-
ously for 20 seconds.
3. Outdoor air temperature is below –13°C and outdoor heat exchang-
er temperature (C1) of below (outdoor air temperature – 5)°C is
detected continuously for 20 seconds.
(2) Defrost cancel
• Defrost end conditions
1. Outdoor heat exchanger temperature (C1) rises to 12°C or higher.
2. Outdoor heat exchanger temperature is 7°C or higher continuously
for 1 minute.
3. Defrost time of 10 minutes has elapsed.
(3) Startup operation
After defrost ends, the compressors and outdoor unit fan stop for approxi-
mately 40 seconds, then operation begins in heating mode.
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3
Defrost control
Defrost sequence
Heating operation
(25-minute mask)
Frost detection
Defrost start
(reverse cycle defrost)
Defrost in progress
Defrost cancel
Start-up operation
Operating frequency: 61.8 Hz
Outdoor unit fan: OFF
Electronic control valve: step 300
4-way valve: OFF
Indoor unit fan: OFF
Temperature in defrost condition area is detected
continuously for 3 minutes or for 60 minutes in total.
Outdoor heat exchanger temperature (C1) (°C)
Outdoor air
temperature (TO) (°C)
–13.7 0 10
–3
–8
–18
X
Defrost condition area
04-309 Sanyo-2 10/27/04 1:45 PM Page 4