42
Technical Information
Service Manual
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)
) <35.6ºF , 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+37.4
),
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)
] ≤ 32.9ºF , start
up the machine for cooling, the cooling operation will start;
(2) During operations of cooling, if 32ºF ≤ [Tsetup – (T
indoor ambient
temperature
–
⊿
T
cooling indoor ambient temperature compensation)
] < 35.6ºF , the
cooling operation will be still running;
(3) During operations of cooling, if 35.6ºF ≤ [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: 60.8~86ºF (Cooling at room
temperature);
(2) If T
outdoor ambient temperature
< [T
low-temperature cooling temperature
], the
temperature can be set at: 77~86ºF (Cooling at low temperature),
that is, the minimum setting temperature for outer units judgment
is 77ºF .
(2) Dehumidifying Mode
1. Conditions and processes of dehumidifying operations: Same
as the cooling mode;
2. The temperature setting range is: 60.8~86ºF;
(3) Air-supplying Mode
1. The compressor, outdoor fans and four-way valves are
switched off;
2. The temperature setting range is: 60.8~86ºF.
(4) Heating Mode
1. Conditions and processes of heating operations: (Tindoor
ambient temperature is the actual detection temperature of indoor
environment thermo-bulb, Theating indoor ambient temperature
compensation is the indoor ambient temperature compensation
during heating operations)
(1) If the compressor is shut down, and [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
] ≤ 32.9ºF , start the
machine to enter into heating operations for heating;
(2) During operations of heating, if 32ºF ≤ [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
] < 35.6ºF , the
heating operation will be still running;
(3) During operations of heating, if 35.6ºF ≤ [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
], the heating
operation will stop after reaching the temperature point.
2. The temperature setting range in this mode is: 60.8~86ºF .
3. Special Functions
Defrosting Control
①
Conditions for starting defrosting
After the time for defrosting is judged to be satisfied, if the
temperature for defrosting is satisfied after detections for
continuous 3minutes, the defrosting operation will start.
②
Conditions of nishing defrosting
The defrosting operation can exit when any of the conditions
below is satised:
③
T
outdoor pipe temperature
≥ (T
outdoor ambient temperature
– [T
temperature 1 of
nishing defrosting
];
④
The continuous running time of defrosting reaches [tmax.
defrosting time].
4. Control Logic
(1) Compressor Control
Start the compressor after starting cooling, heating, dehumidifying
operations, and the outer fans start for 5s; When the machine is
shutdown, in safety stops and when switching to air-supplying
mode, the compressor will stop immediately. In all modes: once
the compressor starts up, it will not be allowed to stop until having
run for the [tmin. compressor running time] (Note: including cases
of shutdown when the temperature point is reached; except the
cases requiring stopping the compressor such as fault protection,
remote shutdown, mode switching etc.); In all modes: once the
compressor stops, it will be allowed be restart after 3-minute
delay (Note: The indoor units have a function of power memory,
the machine can be restarted after remote shutdown and
powering up again without delay).
1. Cooling mode
Start the machine to enter into cooling operation for cooling, the
compressor is switched on.
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