Technibel CAFP 124 R Technical Data & Service Manual page 86

Defrost control
Defrost control
Defrost sequence
Heating operation
(25-minute mask)
1
Frost detection
Defrost start
(reverse cycle defrost)
Defrost in progress
2
Defrost cancel
2
3 Start-up operation
(1) Frost detection
1. Outdoor heat exchanger temperature (C1) method
(15-minute mask after operation start)
Outdoor heat exchanger temperature (C1) (°C)
–13.7
Temperature in defrost condition area is detected
continuously for 3 minutes or for 60 minutes in total.
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.
• Operating frequency: 61.8 Hz
•
Outdoor unit fan: OFF
•
Electronic control valve: step 300
•
4-way valve: OFF
•
Indoor unit fan: OFF
Outdoor air
temperature (TO) (°C)
0 10
–3
–8
Defrost condition area
–18
X
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