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◆ When compressor is running (not including each malfunction and protection):
a.When outdoor ambient temperature≥20°C(68°F) and indoor fan speed is low or medium, the fan speed will turn to high; if indoor fan speed
is high or super high, it will keep the same.
b.When outdoor ambient temperature≤18°C(64.4°F) , the fan speed will resume set fan speed.
c. When 18°C<outdoor ambient temperature<20°C(68F), it will run at present fan speed (set fan speed or high fan speed); but when first
exiting cold air prevention after entering heating mode, it will run in set fan speed.
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, and one of the
following conditions is reached, the unit will enter the defrost mode after 3 minutes.
(1). T outdoor ambient ＞ 5°C(41°F), T outdoor tube≤-2°C(28.4°F);
(2) 0°C≤T outdoor ambient ＜ 5°C(41°F), T outdoor tube≤-6°C(21.2°F);
(3) -5°C≤T outdoor ambient ＜ 0°C(32°F), T outdoor tube-T compensatory ≤ (T outdoor ambient-5°C(23°F)),T outdoor tube≤-6°C(21.2°F);
(4)-10°C≤T outdoor ambient ＜ -5°C(23°F); T outdoor tube-T compensatory ≤ (T outdoor ambient-5°C(23°F))
(5)T outdoor ambient ＜ -10°C(14°F), T outdoor tube-T compensatory ≤ (T outdoor ambient-5°C(23°F))
(after energizing, T compensatory=0°C(32°F) during the first defrosting; if it is not the first defrosting, T compensatory is confirmed by T out-
door tube of quitting last defrosting: a. when T outdoor tube ＞ 2°C(35.6°F), T compensatory=0°C(32°F); b. when T outdoor tube ≤ 2°C(35.6°F),
Tcompensatory=3°C(37.4°F))
At that time, the indoor fan stops and the compressor stops, and after 30 seconds the outer fan will stop, and then after 30 seconds,the four-
way valve will stop. After 30 seconds, the compressor is initiated for raising the frequency to defrost frequency.When the compressor has
operated under defrost mode for 7.5 minutes, or T outdoor ambient ≥ 10°C, the compressor will be converted to 46Hz operation. After 30
seconds, the compressor will stop. And after another 30 seconds, the four-way valve will be opened, and after 60 seconds, the compressor
and the outer fan will be started, the indoor fan will run under preset cold air prevention conditions, and H1 will be displayed at temperature
display area on the display panel. Defrost frequency is 70Hz.
③ Protection
◆ Cold air prevention
The unit is started under heating mode (the compressor is ON):
① In the case of T indoor amb. <24°C(75.2°F): if T tube≤40°C(104°F) and the indoor fan is at stop state, the indoor fan will begin to run at
low speed with a time lag of 2 minutes. Within 2 minutes, if T tube>40°C(104°F) , the indoor fan also will run at low speed; and after 1-min-
ute operation at low speed, the indoor fan will be converted to operation at preset speed. Within 1-minute low speed operation or 2-minute
nonoperation,if T tube>42°C(107.6°F) , the fan will run at present speed.
② In the case of T indoor amb. ≥24°C(75.2°F): if T tube≤42°C(107.6°F), the indoor fan will run at low speed, and after one minute, the indoor
fan will be converted to preset speed. Within one-minute low speed operation, if T tube>42°C(107.6°F), the indoor fan will be converted to
preset speed.
Note: T indoor amb. indicated in ① and ② refers to, under initially heating mode, the indoor ambient temperature before the command to start
the compressor is performed according to the program, or after the unit is withdrawn from defrost, the indoor ambient temperature before the
defrost symbol is cleared.
(5) 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 16~30°C(60.8~86°F).
(6)AUTO Mode
① Operation way of AUTO mode
a.When Tambient≥26°C(78.8°F), it will run in cooling mode. The implied set temperature is 25°C(77°F) (note: the set temperature sending to
outdoor unit is 25°C(77°F)).
b.For heating and cooling unit, when Tambient≤22°C(71.6°F), it will run in heating mode. The implied set temperature is 20°C(68°F);
for cooling only unit, when Tambient≤22(71.6°F)°C, it will run in fan mode and the displayed set temperature is 25°C(77°F).
28
+5
T
preset
+2
T
preset
T
.
amb
6min.
3min.
Compressor
30s
Outdoor fan
60s
Indoor fan
<2 min.
preset
wind
Reversing
valve
Run
Stop heating
Original operating status
Start heating
6min.
30s
60s
<2 min.
preset
wind
Stop
Service Manual
Installation and Maintenance
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