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Time Chart for Defrosting<br />
COMPRESSOR<br />
SOLENOID COIL<br />
(4 WAY VALVE)<br />
OUTDOOR FAN<br />
(H or M)<br />
INDOOR FAN<br />
(SET SPEED)<br />
“STANDBY”<br />
INDICATOR<br />
1 MINUTE<br />
ON<br />
ON<br />
ON<br />
Defrosting<br />
Start<br />
MAX. 9 MINUTES 1 MINUTE<br />
OFF OR LL<br />
❑ During the defrost cycle, STANDBY appears on the remote controller.<br />
❑ *......Cold Draft Prevention may operate occasionally<br />
II - 12<br />
2. Processes and functions<br />
2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating)<br />
When the outdoor temperature is low, frost may form on the outdoor heat exchanger coil.<br />
When this occurred, the defrosting system operates. The microprocessor in the outdoor<br />
unit monitors the relationship between the temperature of the outdoor heat exchanger coil<br />
and the outdoor temperature so it can defrost when necessary.<br />
Flow of Defrosting<br />
Heating operation<br />
No counting time for detecting<br />
frost : 15 minutes<br />
Detecting the frost<br />
Stand by time for defros:<br />
25 minutes<br />
Defrosting<br />
Release of defrosting<br />
Refer to time chart.<br />
*Minimum continuous operating time by defrosting is 48 minutes (= 15 + 8 + 25).<br />
Occurs either when the temperature of C1 (the outdoor<br />
heat exchanger coil) has reached 10°C or above,<br />
or when the maximum defrosting time (9 minutes)<br />
has elapsed.<br />
ON ON<br />
“STANDBY” APPEARS<br />
OUTDOOR COIL<br />
TEMP. C1 (°C)<br />
Y “RELEASE OF<br />
DEFROSTING”<br />
10 RANGE<br />
OUTDOOR AIR TEMP.<br />
(°C)<br />
-13.7 10<br />
X<br />
-3<br />
-8<br />
The area below the heavy line<br />
is the frost detection area.<br />
-20<br />
Either continuous 8 minutes or cumulative 60 minutes<br />
are required to detect frost in the “Frosting” range.<br />
OFF<br />
OR LL<br />
Release of<br />
Defrosting<br />
ON<br />
ON<br />
1575_M_S<br />
0441_M_S<br />
Fig. 13<br />
Fig. 14