27
Technical Information
Service Manual
6.3 Brief Description of Models and Functions
1.Summary
Temperature parameter
◆
Indoor set temperature (Tpreset)
◆
Indoor ambient temperature (Tamb.)
◆
Inner tube temperature of indoor evaporator (Ttube)
2. Introduction of basic mode function
Once the compressor is energized, there should be a minimum
interval of 3 mins between two start-ups.
If the unit is with memory function and is off before power failure,
the compressor can be restarted without an interval of 3 mins; if
the unit is on before power failure, the compressor will be restarted
with an interval of 3 mins.
Once compressor is started, it won’t stop within 6 mins according
to the change of room temp.
(1) Auto mode
①
Operation condition and process
Under auto mode, the system will automatically select operation
mode (cooling, dry, heating and fan) according to indoor ambient
temperature.
◆
When Tamb.
＞
26
℃
, the system operates under cooling mode;
Ex-factory set temperature is 26
℃
.
◆
When 20
℃
≤Tamb.≤26
℃
, the system operates under drying
mode; Ex-factory set temperature is 24
℃
.
◆
Heat pump unit: when Tamb.
＜
20
℃
, the system operates
under heating mode; Ex-factory set temperature is 20
℃
.
◆
Cooling only unit: when Tamb.
＜
20
℃
, the system operates
under fan mode; Ex-factory set temperature is 20
℃
.
②
Protection function is same as that under cooling, drying and
heating mode. (See function protection of this section)
(2) Cooling mode
①
Operation condition and process
◆
When Tamb.≥Tset+1
℃
, the system operates under cooling
mode. In this case, the compressor and the ODU fan motor
operate, and the IDU fan motor operates at set speed.
◆
When Tset-1
℃＜
Tamb.
＜
Tset+1
℃
, the system will maintain
its previous operation status.
◆
When Tamb.≤Tset-1
℃
, the compressor and the ODU fan motor
stop, while the IDU fan motor operates at set speed.
In cooling mode, the 4-way valve is de-energized (4-way valve is
not available for cooling only unit). Temperature setting range is
16
～
30
℃
.
Indicates operation
Indicates stop
Tpreset +1 ˚C
Tpreset –1 ˚C
Compressor
Indoor fan motor
Graphic instruction:
(Same as below)
Tamb.
Stop cooling
Start cooling
Original operating status
6 min. 3 min. 6 min.
Set fan speed
②
Protection function (See function protection of this section)
(3) Drying mode
①
Operation condition and process
◆
When Tamb.
＞
Tset+2
℃
, the system starts drying and cooling.
In this case, the compressor and the ODU fan motor operate, and
the IDU fan motor operates at low speed.
◆
When Tset-2
℃
≤Tamb.≤Tset+2
℃
, the compressor and the
ODU fan motor operate for 6 mins and stop for 4 mins in cycle; the
IDU fan motor operates at low speed.
◆
When Tamb.
＜
Tset-2
℃
, the compressor and the ODU fan
motor stop, while the IDU fan motor runs at low speed.
In drying mode, the 4-way valve is de-energized (4-way valve is
not available for cooling only unit); Temperature setting range is
16
～
30
℃
. Fan speed can’t be adjusted.
②
Protection functions (See function protection of this section)
(4)Heating mode(heating mode is not available for cooling
only uni)
①
Operation condition and process
◆
When Tamb.≤Tset-1
℃
, the system starts heating operation. In
this case, the 4-way valve is energized. The compressor and the
ODU fan motor operates simultaneously; The IDU fan motor will be
started up after delayed for a period of time to make sure the air
conditioner won’t blow out cold wind.
◆
When Tpreset-1
℃＜
Tamb.
＜
Tpreset+1
℃
, the system keeps
previous operation status.
◆
When Tamb.≥Tpreset+1
℃
, the compressor and the ODU fan
motor stop. The 4-way valve is energized all the time. The IDU
fan motor will blow residual heat after operating at set speed for a
period of time consecutively to make sure the inner temperature of
air conditioner won’t be too high.
In heating mode, 4-way valve is energized. Temperature setting
range is 16
～
30
℃
.
T
preset
+2
T
preset-
2
Cooling
Drying
Stop
6 min
6min.
4min.
4min.
Compressor
Low speed
Outdoor fan motor
Indoor fan motor
10S
10S
T
preset
+1
T
preset
-1
Stop heating
Original operating status
Start heating
valve
Outdoor unit
Intdoor unit
Compressor
min.
min.
min.
T
amb
.
.nim.nim
Set fan speedSet fan speed
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