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■ Defrost Control
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below 21°F after 60 minutes passed from
starting of heating operation and more than 10 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation or when the outdoor fan operates within 4
minutes after the outdoor pipe temperature rises over 54°F even if before 12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below 21°F after 60 minutes passed from
ending of the first defrost and more than 10 minutes operation of compressor.
OUTDOOR
PIPE TEMP.
More than 60 minutes of
heating operation
More than 10 min.
running of compressor
More than 60 minutes of
heating operation
More than 10 min.
running of compressor
Within
12minutes
Defrost
Defrost
HOT-
START
Within
4 minutes
54°F
(DEFROST OFF)
21°F
(DEFROST ON)
INDOOR FAN SPEED ON OFF ON OFF
COMPRESSOR ON ON ON ON
4-WAY VALVE ON OFF ON OFF
OUTDOOR FAN ON OFF ON OFF
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