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SM830082
1
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4
Section
5
2. Processes and functions
2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating)
When the outdoor temperature is low, frost may form on the outdoor heat exchanger coil.
When this occurred, the defrosting system operates. The microprocessor in the outdoor unit
monitors the relationship between the temperature of the outdoor heat exchanger coil and the
outdoor temperature so it can defrost when necessary.
Fig. 13
Fig. 14
COMPRESSOR
OFF OR LL
OFF
OR LL
Release of
Defrosting
Defrosting
Start
SOLENOID COIL
(4 WAY VALVE)
OUTDOOR FAN
(H OR L)
INDOOR FAN
(SET SPEED)
“STANDBY”
INDICATOR
MAX. 9 MINUTES 1 MINUTE1 MINUTE
ON ON
ON
ON
ON
ON
ON
“STANDBY” APPEARS
0442_M_S
Time Chart for Defrosting
❑ During the defrost cycle, STANDBY appears on the remote controller.
❑ *......Cold Draft Prevention may operate occasionally
Occurs either when the temperature of C1 (the outdoor
heat exchanger coil) has reached 50°F or above,
or when the maximum defrosting time (9 minutes)
has elapsed.
Refer to time chart.
*Minimum continuous operating time by defrosting is 48 minutes (= 15 + 8 + 25).
Release of defrosting
Defrosting
Stand by time for defros:
25 minutes
Flow of Defrosting
Heating operation
No counting time for detecting
frost : 15 minutes
Detecting the frost
OUTDOOR COIL
TEMP. C1 (°F)
Y
“RELEASE OF
DEFROSTING”
RANGE
50
7.3 50
OUTDOOR AIR TEMP.
(°F)
X
27
18
The area below the heavy line
is the frost detection area.
–4
Either continuous 8 minutes or cumulative 60 minutes
are required to detect frost in the “Frosting” range.
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