53
Installation and Maintenance
Service Manual
6. Function and Control
36K
1. Temperature Parameters
Indoor preset temperature(Tpreset)
Indoor ambient temperature (Tamb.)
2. Basic Functions
Once energized, in no case should the compressor be restarted
within less than 3 minutes. In the situation that memory functionis
available, for the first energization, if the compressor is at stop
before de-energization, the compressor will be started withouta
3-minute lag; if the compressor is in operation before de-
energization, the compressor will be started with a 3-minute lag;
andonce started, the compressor will not be stopped within 6
minutes regardless of changes in room temperature;
(1) Cooling Mode
①
Working conditions and process of cooling
When Tamb. ≥ Tpreset, the unit will enter cooling operation, in
which case the indoor fan, the outdoor fan and the compressor
willwork and the indoor fan will run at preset speed.
When Tamb.≤Tpreset+28.4°F, the compressor will stop, the
outdoor fan will stop with a time lag of 60s, and the indoor fan will
run atpreset speed.
When Tpreset+28.4°F < Tamb.< Tpreset, the unit will remain at its
previous state.
Under this mode, the four-way valve will be de-energized and
temperature can be set within a range from 61°F~86°F. If the
compressor is shut down for some reason, the indoor fan and the
swing device will operate at original state.
②
Protection
Antifreeze protection
Under cooling and dehumidifying mode, 6 minutes after the
compressor is started:
If Tevap ≤ 35.6°F, the compressor will operate at reduced
frequency.
If Tevap ≤ 30.2°F is detected for durative 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 Tevap. ≥ 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
≤ 16A, frequency rise will be allowed; if I
total
≥ 17A, frequency
rise will not be allowed; if I
total
≥ 18A, the compressor will run at
reduced frequency; and if I
total
≥ 20A, the compressor will stop and
the outdoor fan will stop with a time lag of 60s.
(2) Dehumidifying Mode
①
Working conditions and process of dehumidifying
If Tamb. > Tpreset, 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 Tpreset+28.4°F ≤ Tamb. ≤ Tpreset the compressor remains at
its original operation state.
If Tamb.< Tpreset , the compressor will stop, the outdoor fan will
stop with a time lag of 60s, and the indoor fan will
operate at low speed.
②
Protection
Protection is the same as that under the cooling mode.
(3) Heating Mode
①
Working conditions and process of heating
If Tamb. ≤ Tpreset+35.6°F(T
indoor ambient
≤ T
setting
+ 2
℃
, start with
heating mode)
,
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 Tamb. ≥ Tpreset+37.4°F(T
indoor ambient
≥T
setting
+3
℃
, it stops when
reaches temperature point), 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 Tpreset < Tamb.<Tpreset+37.4°F(T
setting
＜
T
indoor ambient
＜
T
setting
+3
℃
, maintain heating mode), 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 operatingsymbol,
the heating symbol and preset temperature are revealed on the
display.
②
Condition and process of defrost
When duration of successive heating operation is more than 45
minutes, or accumulated heating time more than 90 minutes,
andone of the following conditions is reached, the unit will enter
the defrost mode after 3 minutes.
a. Toutdoor amb. ≥ 41°F, Toutdoor pipe ≤ 28.4°F;
b. 28.4°F ≤ Toutdoor amb. ≤ 41°F,Toutdoor pipe - Tcompensation≤
23°F
c. 23°F < Toutdoor amb. ≤ 28.4°F, Toutdoor pipe - Tcompensation≤
17.6°F;
d. 14°F < Toutdoor amb. < 23°F, Toutdoor pipe- Tcompensation ≤
Toutdoor amb.+26.6°F;
e. Toutdoor amb. < 14°F, Toutdoor pipe- Tcompensation ≤
Toutdoor amb.+26.6°F;
After energization, when defrosting for the first time
Tcompensation=0°F. If it is not the rstly time for defrosting, the
Tcompensation is determined by the Toutdoor pipe of last time
quitting defrosting.
a.Toutdoor pipe > 35.6°F, Tcompensation=32°F; b. Toutdoor pipe
≤ 35.6°F, Tcompensation=33.8°F.
At that time, the indoor fan stops and the compressor stops, and
after 60 seconds the outer fan will stop, and then after 30seconds,
the four-way valve will stop. After 30 seconds, the compressor is
initiated for raising the frequency to defrost frequency.
Tpreset
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original working state
≥ 6 min.≥ 3 min. ≥ 6 min.
Set fan speed
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