38
Technical Information
Service Manual
Outdoor Units
1. Cooling mode
Working condition and process of cooling mode:
(1) When T
indoor ambient temperature
≥T
preset
, unit enters into cooling mode.
Indoor fan, outdoor fan and compressor start operation.
Indoor fan operates according to set fan speed.
(2) When T
indoor ambient temperature
≤T
preset
-2
o
C , compressor stops
operation and outdoor fan will stop 30s later. Indoor fan operates
according to set fan speed.
(3) When T
preset
-2
o
C<T
indoor ambient temperature
<T
preset
, unit operates
according to the previous status.
Under cooling mode, 4-way valve is not energized. Temperature
setting range is 16~30
o
C . If compressor stops because of
malfunction in cooling mode, indoor fan and swing motor will work
according to the original status.
2. Drying mode
(1) Working condition and process of drying mode
a. When T
indoor ambient temperature
> T
preset
, unit will be in drying mode.
Outdoor fan and compressor start operation while indoor fan will
operate at low fan speed.
b. When Tpreset-2
o
C ≤Tindoor ambient temperature≤Tpreset,
unit operates according to the previous status.
c. When Tindoor ambient temperature < Tpreset-2
o
C ,
compressor stops operation and outdoor fan will stop 30s later.
(2) Under drying mode, 4-way valve is not energized.
Temperature setting range is 16~30
o
C.
(3) Protection function: same as in cooling mode.
3. Fan mode
(1) Under this mode, indoor fan can select different fan speed
(except Turbo) or auto fan speed. Compressor, outdoor fan and
4-way valve all stop operation.
(2) In fan mode, temperature setting range is 16~30
o
C .
4. Heating mode
Working condition and process of heating mode:
(1) When T
preset
-(T
indoor ambient temperature
-T
compensation
)≥1
o
C , unit enters
into heating mode. Compressor, outdoor fan and 4-way valve
start operation.
(2)When -2
o
C < T
preset
-(T
indoor ambient temperature
-T
compensation
) < 1
o
C , unit
operates according to the previous status.
(3)When T
preset
-(T
indoor ambient temperature
-T
compensation
)≤-2
o
C , compressor
stops operation and outdoor fan will stop 30s later. Indoor fan will
be in residual-heat blowing status.
(4) When unit is turned off under heating mode or changed to
other modes from heating mode, 4-way valve will be power-off
2min after compressor stops working (compressor is in operation
status under heating mode).
(5) When T
outdoor ambient temperature
> 30
o
C , compressor stops
operation immediately. Outdoor fan will stop 30s later.
(6) Under the condition that compressor is turned on, when unit
is changed to heating mode from cooling or drying mode, 4-way
valve will be energized in 2~3mins delay.
Note: Tcompensation is determined by IDU and ODU. If IDU
controls the compensation temperature, then Tcompensation
is determined according to the value sent by IDU to ODU; If
IDU does not control the compensation temperature, then
Tcompensation will default to 3
o
C by the ODU.
5. Freon recovery mode
After the Freon recovery signal from IDU is received, cooling at
rated frequency will be forcibly turned on to recover Freon.
Indoor unit will display Fo. If any signal from remote controller is
received, unit will exit from Freon recovery mode and indoor unit
stops displaying Fo.
6. Compulsory defrosting
If unit is turned on under heating mode and set temperature is
16
o
C (by remote controller), press “+, -, +, -, +, -” within 5s, unit
will enter into compulsory defrosting mode and send the signal
to ODU. When the compulsory defrosting signal from ODU is
received, IDU will exit from the compulsory defrosting mode
and stop sending the signal to ODU. After ODU receives the
compulsory defrosting code, it will start compulsory defrosting.
Defrosting frequency and opening angle will be the same as in
normal defrosting mode. When compulsory defrosting is finished,
the complete unit resumes original status.
7. Auto mode
Auto mode is determined by controller of IDU. See IDU logic for
details.
8. 8
O
C heating
Set temperature is 8
O
C. Display board of IDU displays 8
O
C.
Under this mode, “Cold air prevention” function is shielded.
If compressor is operating under this mode, fan speed will adjust
according to auto fan speed; if compressor stops operation under
this mode, indoor fan will be in residual-heat blowing status.
When power on, communication light will be blinking in
a normal way (after receiving a group of correct signals,
blinking stops for 0.2s~0.3s). If There's no communication,
communication light will be always on. If other ODU has
malfunction, communication light will be on for 1s and off
for 1s in a circular way.
6. Function and Control
