-
66
-
'11 • KX-T-166
(5)
Defrost control
(a)
Temperature condition of defrosting
1)
Start conditions
(Standard
specification o
r c
o
ld
region specificatio
n can be selected by switching the jumper
wire J15.)
Defrost operation
will start, when
outdoor
unit
whose compressor
is
operating
under heating
mode
has
satisfied
all
the
following conditions.
(i)
When 33 minutes
of
cumulative
compressor operation
time has passed since heating
operation
started.
(ii)
When 33 minutes
of
cumulative
compressor operation
time has passed since the
previous defrosting
ended.
(iii)
When 8 minutes has passed since the
compressor
turned ON
from
OFF status.
(iv)
When 8minutes has passed since
one outdoor
fan turned ON
from
OFF status.
(v)
After all above conditions have been met, when any of the following conditions is satisfied.
When the
outdoor
heat exchanger temperature (sensed by
Tho-R)
and the
outdoor
air temperature (sensed
by
Tho-A) dropped below
the
defrosting
start temperature in Fig. 1
for
30
seconds continuously
When the
suction
pressure saturated temperature calculated by the
low
pressure (sensed by PSL) and the
outdoor
air temperature (sensed by
Tho-A) dropped below
the
defrosting
start temperature in Fig. 2
for
3
minutes
continuously
TR:
Heat e
xchanger temperature
.(°C)
TA: Outdoor air temperature. (°C)
TA: Outdoor air temperature. (°C)
Fig. 1
Cold region
Standard
(Factory setting)
Defrost start zone
-2
-6
-15
-19
-21
-25
-20
-15
6
Without J15
Cold region specification
With J15
SST
:Suction pressure saturated temperature
.(°C)
Fig. 2
Cold region
Standard
(Factory setting)
Defrost start zone
-6
-10
-19
-23
-25
-29
-20
-15
6
Without J15
Cold region specification
With J15
2)
End conditions
