SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
44
421 08 9204 00
d.
14
°
F
T
outer amb
.
<
23
°
F
, T
outer tube
−
T
compensatorys
(T
outdoor
amb.
−
5.4
°
F)
e. T
outdoor amb
.
>14
°
F
T
outer tube
−
Tcompe
n
satorys
(T
outdoor amb.
−
5.4
°
F)
After energization, for the first defrost, T
compensation
=0
°
F; if it is
not the first defrost, T
compensation
will be determined by T
outdoor
pipe when defrost ends.
a. T
outdoor pipe
>
35.6
°
F; T
compensation
= 0
°
F;
b. T
outdoor
pipe
35.6
°
F; T
compensation
= 5.4
°
F;
During defrosting, if operation time for compressor doesn’t reach
3 minutes, the condenser will not defrost in the next 2 hours. At
the time of defrost the compressor stops operation, and 30
seconds later, the outdoor fan stops operation. In an additional
30 seconds, the 4
−
way valve will stop operation. 30 seconds
later, compressor will increase it’s frequency to 85 Hz for
defrosting. Defrost will last for 450 seconds, or until the outdoor
pipe
≥
50
°
F. When defrost is complete the compressor will
decrease its frequency. 30 seconds later the compressor will
stop operation. In 30 seconds the 4
−
way valve will be started up.
60 seconds later the compressor and outdoor fan will operate.
Protection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
In the case of T
indoor amb
. <75.2
°
F : if T
tube
107.6
°
F and
the indoor fan is stopped, the indoor fan will begin to run at low
speed with a time lag of 2 minutes. Within 2 minutes, if T
tube
>104
°
F, the indoor fan also will run at low speed; and after
1
−
minute operation at low speed, the indoor fan will be ramped
to operation at a preset speed. Within 1
−
minute of low speed
operation or 2
−
minutes of non
−
operation, if T
tube
>108
°
F, the fan
will run at preset speed.
In the case of Ti
ndoor amb
.
≥
75
°
F: if T
tube
108
°
F, the indoor
fan will run at low speed, and after one minute, the indoor fan will
be ramped to preset speed. Within one
−
minute low speed
operation, if T tube>107.6
°
F, the indoor fan will be ramped to
preset speed.
Note: T
indoor amb
. indicated in
and
refers to, the indoor
ambient temperature before the command to start the
compressor is performed, or after the unit is withdrawn from
defrost and the defrost symbol is cleared.
Total current up and frequency down protection
If the total current I
total
≤
W, frequency rise will be allowed; if I
total
≥
X frequency rise will not be allowed; if I
total
≥
Y, the compressor
will run at reduced frequency; and if I
total
≥
Z, the compressor will
stop and the outdoor fan will stop with a time lag of 30s.
Fan Mode
Under the mode, the indoor fan will run at preset speed and the
compressor, the outdoor fan, the four
−
way valve and the electric
heater will stop.
Under the mode, temperature can be set within a range of 61
°
F
−
86
°
F.
AUTO Mode
Working conditions and Auto mode process:
Under AUTO mode, standard cooling temperature T
preset
is 77
°
F
and standard heating temperature T
preset
is 64.4
°
F.
Once energized, if T
amb
≤
68
°
F, the unit will be started under
heating mode; if 68
°
F < T
amb
.< 77
°
F, the unit will run under fan
mode and the run indicator will be bright; and if T
amb
≥
77
°
F, the
unit will be started under cooling mode.
Under AUTO mode, if T
amb
.
T
preset
is detected, the unit will
select to run under cooling mode, in which case the preset
temperature is 77
°
F; if T
amb
.
T
preset
−
3.6
°
F, the compressor will
stop, the outdoor fan will stop with a time lag of 1 minute, and the
indoor fan will run at preset speed. If T
preset
–(
−
3.6
°
F)
<
T
amb
.<
T
preset
,
the unit will remain in its original state.
Under AUTO mode, if T
amb
.
T
preset
+3.6
°
F is detected, the unit
will select to run under heating mode, in which case the preset
temperature is 64.4
°
F; if T
amb
.
T
preset
+9
°
F, the compressor will
stop, the outdoor fan will stop with a time lag of 1 minute, and the
indoor fan will blow residual heat; and if T
preset
+3.6
°
F < T
amb
. <
T
preset
+9
°
F, the unit will remain in its original state. The
cooling
−
only unit will run under fan mode.
Under AUTO mode, if 68
°
F
<
T
amb
. <
77
°
F, the unit will remain in
its original state.
Protection
In cooling operation, protection is the same as that under the
cooling mode;
In heating operation, protection is the same as that under the
heating mode;
When ambient temperature changes, operation mode will be
converted preferentially. Once started, the compressor will
remain unchanged for at least 6 minutes.
(6) Common Protection Functions and Fault Display under
COOL, HEAT, DRY and AUTO Modes
Overload protection
T tube : measured temperature of outdoor heat exchanger under
cooling mode; and measured temperature of indoor heat
exchanger under heating mode.
1) Cooling overload
a. If T
tube
125.6
°
F, the unit will return to its original operation
state.
b. If
T
tube
131
°
F, frequency rise is not allowed.
c. If T
tube
136.4
°
F, the compressor will run at reduced
frequency.
d. If T
tube
143.6
°
F, the compressor will stop and the indoor fan
will run at preset speed.
2) Heating overload
a. If T
tube
125.6
°
F, the unit will return to its original operation
state.
b. If T
tube
131
°
F, frequency rise is not allowed.
c. If T
tube
w136.4
°
F, the compressor will run at reduced
frequency.
d. If
T
tube
143.6
°
F, the compressor will stop and the indoor fan
will blow residual heat and then stop.
Exhaust temperature protection of compressor
If exhaust temperature
208.4
°
F, frequency is not allowed to
rise.
If exhaust temperature
217.4
°
F, the compressor will run at
reduced frequency.
If exhaust temperature
230
°
F, the compressor will stop.
If exhaust temperature
194
°
F and the compressor has stayed
at stop for at least 3 minutes, the compressor will resume its
operation.
Communication fault
If the unit fails to receive correct signals for 3 minutes, a
communication fault will be registered and the whole system will
stop.
Module protection
Under module protection mode, the compressor will stop. When
the compressor remains at a stop for at least 3 minutes, the
compressor will resume its operation. If module protection
occurs six times in succession, the compressor will not be
started again.
