SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
421 08 9204 00
43
Function and Controls
Description of Each Control Operation
Temperature Parameters
Indoor preset temperature (T
preset
)
Indoor ambient temperature (T
amb
.)
Basic Functions
Once energized, in no case should the compressor be restarted
within less than 3 minutes. In the situation that memory function
is available, for the first energization, if the compressor is at stop
before de
−
energization, the compressor will be started without a
3
−
minute lag; if the compressor is in operation before
de
−
energization, the compressor will be started with a 3
−
minute
lag; and once started, the compressor will not be stopped within
6 minutes regardless of changes in room temperature;
Cooling Mode
Working Conditions and Cooling Process.
When T
amb
≥
T
preset
, the unit will enter cooling operation, in which
case the indoor fan, the outdoor fan and the compressor will work
and the indoor fan will run at preset speed.
When T
amb
T
preset
−
3.6
°
F , the compressor will stop, the out-
door fan will stop with a time lag of 60s, and the indoor fan will run
at preset speed.
When T
preset
−
3.6
°
F < T
amb
. < T
preset
+1.8
°
F, the unit will remain at
its previous state.
Under this mode, the four
−
way valve will be de
−
energized and tem-
perature can be set within a range from 61
°
F to 86
°
F. If the com-
pressor is shut down for some reason, the indoor fan and the swing
device will operate at original state.
Figure 16
-
Cooling Mode
Total Current Table
Unit Size - V
Variables
A
B
C
D
9
k
115
V
10
A
12
A
14
A
16
A
12
K
115
V
14
A
16
A
18
A
20
A
12
K
230
V
6
A
7
A
8
A
9
A
18
k
230
V
8
A
9
A
10
A
11
A
24
K
230
V
10
A
11
A
12
A
13
A
30
K
230
V
16
A
17
A
18
A
20
A
36
K
230
V
16
A
17
A
18
A
20
A
PROTECTION
Antifreeze Protection
Under cooling and dehumidifying mode, 6 minutes after the
compressor is started:
If T
evap
35.6
°
F, the compressor will operate at reduced
frequency.
If T
evap
30.2
°
F is detected for duration of 3 minutes, the
compressor will stop, and after 60 seconds, the outdoor fan will
stop; and under cooling mode, the indoor fan and the swing
motor will remain at the original state.
If T
evap
. 42.8
°
F and the compressor has remained at OFF for at
least 3 minutes, the compressor will resume its original
operation state.
Total current up and frequency down protection
If I
total
A, frequency rise will be allowed; if I
total
≥
B, frequency
rise will not be allowed; if I
total
≥
C, the compressor will run at
reduced frequency; and if I
total
≥
D, the compressor will stop and
the outdoor fan will stop with a time lag of 30s.
Lag will be 60s for
size 30 and 36 units.
Dehumidifying Mode
Working Conditions and Dehumidifying Process
If T
amb
>T
preset
, the unit will enter cooling and dehumidifying
mode, in which case the compressor and the outdoor fan will
operate and the indoor fan will run at low speed.
If T
preset
−
3.6
°
F
T
amb
T
preset
, the compressor remains at
its original operation state.
If T
amb
.< T
preset
−
3.6
°
F, the compressor will stop, the outdoor fan
will stop with a time lag of 60s, and the indoor fan will
operate at low speed.
Protection
Protection is the same as that under the cooling mode.
Heating Mode
Working Conditions and Heating Process
If T
amb
.
T
preset
+3.6
°
F , the unit enters heating mode, in which
case the four
−
way valve, the compressor and the outdoor fan
will operate simultaneously, and the indoor fan will run at preset
speed in the condition of preset cold air prevention.
If T
amb
.
≥
T
preset
+9
°
F , the compressor will stop, the outdoor fan
will stop with a time lag of 60s, and the indoor fan will stop after
60
−
second blow at low speed
If T
preset
+3.6
°
F < T
amb
. < T
preset
+9
°
F , the unit will maintain its
original operating status.
Under this mode, the four
−
way valve is energized and
temperature can be set within a range of 61
°
F
−
86
°
F. The
operating symbol, the heating symbol and preset temperature
are revealed on the display.
Defrost Mode
Condition and Defrost Process
When T
outdoor
amb.
≥
41
°
F
and the compressor has run for 3 hour,
if T
outdoor
tube
< 0
°
F
is continuously detected for 1 minute, the
unit will enter defrost. [Note: the accumulated time is cleared if
one of the below condition is met. T
outdoor ambient
> 41
°
F, the
compressor starts up after switching to cooling or dry mode,
when defrosting is finished; for other situations besides above
conditions, the accumulated time will not be cleared (including
the unit stops when reaching the temperature point, the unit
stops for protection, switching to fan mode, et. )]
When duration of successive heating operations is more than 45
minutes, or accumulated heating time IS more than 90 minutes,
and one of the following conditions is reached, the unit will enter
the defrost mode after 3 minutes.
a.
T
outdoor amb
.
>41
°
F
,
T
outdoor tube
28.4
°
F
;
b. 28.4
°
F
T
outdoor amb
.
<
41
°
F
, T
outdoor tube
21.2
°
F
;
c.
23
°
F
T
outdoor amb
.
<28.4
°
F
C, T
outdoor tube
17.6
°
F
;
