21
Function and Control
Stop heating
Original running state
Start heating
Compressor
Outdoor Unit
Indoor Unit
Reversal valve
6min
3min
6min
+5
+2
3min
Set fan speed
Set fan speed
3min
Run
Stop
T
amb
T
preset
T
preset
The condition and process of defrosting
When frost is detected in the condenser, the system will enter into defrosting state. When defrosting starts, the compressor and
indoor fan will stop, and the outdoor fan and four-way valve will delay 30 seconds to stop. The compressor will start after 15 seconds
and then defrosting will be started. When the compressor has run for 7 minutes or defrosting is finished, the compressor will stop.
After 30 seconds the four-way valve opens and after another 60 seconds, the compressor and outdoor fan resume running. The
indoor fan will delay 3 minutes to run at the latest and temperature on the display panel shows H1.
Protection function
Anti-cold-wind protection
In HEAT mode, in order to prevent the indoor unit from blowing out cold wind, each time the compressor starts, the indoor fan
will delay 3 minutes after the compressor to run at the latest and it can adjust fan speed automatically when temperature is low.
Overcurrent protection
Overcurrent protection is the same with that in COOL mode.
Four-way valve
Compressor
Outdoor Unit
Indoor Unit
Run
Stop
7min
The period of defrosting
3min Set fan speed
(3) HEAT mode
The condition and process of heating
If T
amb
≤T
preset
+2
, HEAT mode will act, the compressor, outdoor fan and reversal valve will run, the indoor fan will delay
3min to stop at the latest
If T
preset
+2
T
amb
T
preset
+5
,the unit will keep running in the original mode.
If T
amb
≥T
preset
+5
, the compressor will stop, the outdoor fan will delay 30sec to stop and indoor fan will blow 60S at low
speed, the fan speed cannot be shifted within blow residual heat.
In this mode, the temperature setting range is 16
~30
.
The air conditioner will adjust the running frequency of the compressor automatically according to the change of ambient
temperature.
When the unit is turned off in HEAT mode, or switched to other mode from HEAT mode, the four-way valve will be powered
off after the compressor stops.
3.Protection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
In the case of T
indoor amb.
<24
: if T
tube
40
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
, the indoor fan also will run at low speed; and after
1-minute operation at low speed, the indoor fan will be converted to operation at preset speed. Within 1-minute low speed
operation or 2-minute non-operation, if T
tube
42
, the fan will run at present speed.
In the case of T
indoor amb.
24
: if T
tube
42
, 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
, the indoor fan will be converted
to preset speed.
