II - 5
Processes and Functions
SM830052
2
¶ Defrost is accomplished through a compressor reverse-cycle.
¶ During defrost operation, the outdoor fan is stopped and the indoor fan is either stopped or run at L or LL.
2-1. Frost detection
(1) Frost is not monitored for the first 5 minutes of operation.
(2) The frost detection conditions are:
Condition 1 = heat exchanger liquid temp. is 8 minutes continuously below the L2 line
Condition 2 = heat exchanger liquid temp. is 60 minutes, cumulative, below the L1 line
2. Reverse Cycle Defrosting
2-2. Defrost execution condition
(1) 35 minutes or less, cumulative, for heating operation
2-3. Defrost end conditions
(1) Outdoor heat exchanger liquid temperature ] 15 ˚C
(2) Defrost operation is 12 minutes maximum.
(3) Reverse-cycle defrost control
1 minute 12 minutes max. 1 minute
P/C compressor OFF Compressor capacity control OFF
AC compressor OFF
↑
OFF
4-way valve ON OFF OFF ON
Outdoor fan STOP STOP H
Low-pressure valve ON Compressor capacity control ON
High-pressure valve OFF
↑
OFF
Save valve ON Save valve control ON
–25
–23
–10
The area below the heavy lines is
the frost detection area.
L2
L1
–3
–21.4
–8
–1
15
10 Outdoor temperature °C
0330_M_I
Heat exchange liquid temperature °C
Defrost
end temperature
This end temperature differs
from the frost detection
temperature above.
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