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Technical Information

Service Manual

◆

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) -2°C≤T outdoor ambient

＜

5°C(41°F),, T outdoor tube≤-6°C(21.2°F);

(3) -5°C≤T outdoor ambient

＜

-2°C(28.4°F), T outdoor tube≤-8°C(17.6°F);

(4)-10°C≤T outdoor ambient

＜

-5°C(23°F);, T outdoor tube-T compensatory ≤ (T outdoor ambient-3°C(5.4°F))

(5)T outdoor ambient

＜

-10°C(14°F), T outdoor tube-T compensatory ≤ (T outdoor ambient-3°C(5.4°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 85Hz.

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).

preset

Stop heating

Original operating status

Start heating

Run

Indoor fan

valve

Outdoor fan

Compressor

Stop

3min.

6min.