20
Installation and Maintenance
Service Manual
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
℃
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
℃
(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 nished, 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 theres 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.
1. Input Parameter Compensation and Calibration
(1) Check the ambient temperature compensation
function Indoor ambient temperature compensation
function.
a. In cooling mode, the indoor ambient temperature participating
in computing control = (T
indoor ambient temperature
–
⊿
T
cooling indoor ambient
temperature compensation
)
b. In heating mode, the indoor ambient temperature participating
in computing control= (T
indoor ambient temperature
–
⊿
T
heating indoor ambient
temperature compensation
)
(2) Check effective judgment controls of parameters
Effective judgment function of the outdoor exhaust temperature
thermo-bulb When conditions a and b are satised, the outdoor
exhaust temperature thermo-bulb is judged not to be connected
into place, the mainboard of outer units will display failure of the
outdoor exhaust temperature thermo-bulb (not connected into
place), stop the machine for repairing, and resume the machine
by remote controls of ON/OFF.
a. Judgment of exhaust detection temperature change:
After the compressor starts up and runs for 10 minutes, if the
compressor frequency f ≥ 40Hz, and the rising value Texhaust
(T
exhaust (after start-up for 10 minutes)
- T
exhaust (before start-up)
) < 2ºC , the
outdoor exhaust temperature thermo-bulb can be judged not to be
connected into place (judging once when the power is on the rst
time).
b. Comparative judgment of exhaust detection temperature and
condenser detection temperature (T
pipe temperature
= T
outdoor pipe
temperature in cooling mode
, T
pipe temperature
= T
indoor pipe temperature in heating mode
):
After the compressor starts up and runs for 10 minutes, if the
compressor frequency f ≥ 40Hz, and T
pipe temperature
≥(T
exhaust+3
),
the outdoor exhaust temperature thermobulb can be judged not to
be connected into place (judging once when power is on the rst
time).
2. Basic Functions
(1) Cooling Mode
1. Conditions and processes of cooling operation:
(1) If the compressor is shut down, and [Tsetup – (T
indoor ambient
temperature
–
⊿
T
cooling indoor ambient temperature compensation)
] ≤ 0.5 , start up
the machine for cooling, the cooling operation will start;
(2) During operations of cooling, if 0ºC ≤ [Tsetup – (T
indoor ambient
temperature
–
⊿
T
cooling indoor ambient temperature compensation)
] < 2 , the cooling
operation will be still running;
(3) During operations of cooling, if 2ºC ≤ [Tsetup – (T
indoor ambient
temperature
–
⊿
T
cooling indoor ambient temperature compensation)
], the cooling
operation will stop after reaching the temperature point.
2. Temperature setting range
(1) If T
outdoor ambient temperature
≥ [T
low-temperature cooling temperature
],
the temperature can be set at: 16~30ºC (Cooling at room
temperature);
(2) If T
outdoor ambient temperature
< [T
low-temperature cooling temperature
], the
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