3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
35sec later 4WAY valve : OFF
41sec later Compressor : ON
Heating operation start : Compressor ON
Outdoor HEX temp. : Over 15
°
C
Compressor ON time : Maximum 15 minutes
Defrost end
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost start
Tn < -17°C
Ta > -10°C
Tn < 0.8
×
Ta - 11.6
Tn < -24°C
=
=
Tn - Tn-1 < -2°C
and Sn = Sn-1
=
Ta < -20°C
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N
(Integrating OFF count defrost)
-20°C < Ta < -10°C
Tn < -6°C
More than 210 minutes
( For continuous operation )
or
Tn < -3°C
(and after 30 minutes,
if the Tn < -3°C
(and after 3 minutes,
if the Tn < -5°C
Tn < -5°C
or
=
=
Tn < 0.8
×
Ta - 11.6
Tn < -28°C
=
=
=
Compressor OFF count :
40 times
(Less than 10 minutes)
or
or
Tn
Ta
Tn-1
Sn
Sn-1
: Outdoor heat exchanger temp.
: Outside air temp.
: Before 5 minutes detected Tn
: Number of operation indoor units
: Before 5 minutes detected Sn
01-30
