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Condensation control
1. When the air-conditioner has been continuously running for 20 minutes and the
outdoor air temperature is under 30
, and the fan speed is under Lo and the heat
exchanger temperature is in the following ranges, condensation control will be carried
out so as to prevent condensation.
out so as to prevent condensation.
Condensation control will be released
w h e n
t h e
c o m p r e s s o r
i s
stopped, the outdoor air temperature
is over 30
is over 30
, the indoor fan speed is
over Lo, the remote control setting
( f a n
( f a n
s p e e d ,
t e m p e r a t u r e )
i s
changed, or the heat exchanger
temperature is in the resuming range.
temperature is in the resuming range.
15
14
13
12
indoor heat exchanger
temperature
temperature
resetting range
rising range
unchanging
range
falling range
2. Airflow direction control
Wall-mounted type: the position of the vertical vane is the angle of condensation control. If
the fan speed is Slo, increase it to the Lo status.
Cassette type: refer to the angle of condensation control.
the fan speed is Slo, increase it to the Lo status.
Cassette type: refer to the angle of condensation control.
Anti-fog control
1. When the set fan speed of the Remote control is under Lo and the temperature of the heat
exchanger is in the following ranges, it is in anti-fog control.
15
14
13
12
indoor heat exchanger
temperature
temperature
resetting range
rising range
unchanging
range
falling range
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
indoor fan
compressor
relay
draining pump
10 seconds
If the compressor is running, 10 seconds after the indoor fan starts to operate, the drain pump
will start to work.
wall-mounted type: if the fan speed is Slow,
change it to Lo.
change it to Lo.
When the compressor is stopped, the
indoor fan speed is not less than Me, or
the heat exchanger temperature is in the
resetting range, anti-fog control will be
released.
indoor fan speed is not less than Me, or
the heat exchanger temperature is in the
resetting range, anti-fog control will be
released.
1. When the air conditioner starts to run:
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CU-MP28DBH5/CU-MP50DBH5
Drain pump control
If the compressor stops while the indoor fan runs, 10 seconds later the drain pump will start to run
when the compressor starts.
when the compressor starts.
indoor fan
compressor
relay
draining pump
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
10 seconds
2. When indoor unit is stopped:
To prevent reverse flow, the drain pump will run forcefully for 6 minutes after the air-conditioner stops.
compressor
relay
draining pump
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
6 seconds
3. Floating switch actions:
So long as the power supply is switched on, the floating switch can be in normal action
although the indoor unit is in the stop status.
although the indoor unit is in the stop status.
In cooling operation, the floating switch action will send the indoor load ( D) of 0 to the
outdoor unit and the draining pump will run continuously.
outdoor unit and the draining pump will run continuously.
When the floating switch is continuously on for over 5 minutes, the draining pump will stop
running and the indoor unit will stop, too; the timer indicator light will flash.
Abnormity display: F15-01.
running and the indoor unit will stop, too; the timer indicator light will flash.
Abnormity display: F15-01.
A. The floating switch is continuously on for over 5 minutes.
ON
OFF
ON
OFF
ON
OFF
10 seconds
5 minutes
Timer indicator light flashing
compressor
relay
draining pump
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CU-MP28DBH5/CU-MP50DBH5
B. The floating switch will be reset within 5 minutes after switched on.
compressor
relay
draining pump
ON
OFF
ON
OFF
ON
OFF
5 minutes
relay on
6 minutes
C. The floating switch will be switched on twice within 20 minutes after it is reset.
Control is effective if forced operation lasts 6 minutes.
floating switch twice
floating switch
10 seconds
10 seconds
10 seconds
10 seconds
10 seconds
ON
OFF
OFF
20 minutes
abnormity display
floating switch once
Because of the floating switch acts for three times in a short period, there is abnormity display:
F15-01
If the floating switch does not act twice at position
F15-01
If the floating switch does not act twice at position
, 20-minute control of the timer will be
cancelled .
In the following floating switch actions, the draining pump will continuously run. (including in
heating and abnormal mode stop)
heating and abnormal mode stop)
A. The floating switch is continuously on for over 5 minutes.
ON
OFF
OFF
ON
OFF
OFF
10 seconds
5 minutes
Timer indicator light flashing
draining pump
floating switch
When the floating switch is continuously on for over 5 minutes, the draining pump will stop
running, and the time indicator light will flash.
Abnormity display: F15-01
running, and the time indicator light will flash.
Abnormity display: F15-01
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CU-MP28DBH5/CU-MP50DBH5
B. The floating switch will be reset within 5 minutes after switched on.
ON
OFF
OFF
ON
OFF
OFF
10 seconds
5 minutes
normal running
draining pump
floating switch
When the floating switch is continuously on for 10 seconds, the draining pump will
continuously run for 4 minutes and 50 seconds.
continuously run for 4 minutes and 50 seconds.
C. The floating switch will be switched on twice within 20 minutes after it is reset, the same as
the condition in cooling operation.
D. When the draining pump is running (floating switch action), the draining pump run will be
delayed by 6 minutes if it cannot be reset due to abnormity (sensor abnormity,
communication abnormity, etc.).
communication abnormity, etc.).
Maximal cooling capacity control (only for the wall-mounted type)
Within 30 minutes after air-conditioner starts to run, if the outdoor air temperature is not less
than 30
, the indoor air temperature is not less than 24
, the set fan speed of the remote
control is Hi, and the set temperature is 16
, the air-conditioner will carry out maximal
capacity control and the indoor fan speed will be increased to be Shi.
Forced cooling operation control
When the Forced cooling operation button is pressed to run in the mode of Forced cooling,
D (indoor load) will be fixed to be 22, which is irrelevant to the indoor temperature. It can
be released by remote control or shutting power supply.
be released by remote control or shutting power supply.
Cooling rated capacity control
When the air-conditioner has been continuously running for over 60 minutes, carry out
cooling rated capacity control (1. send fixed D of 22; 2 to outdoor; 2.send the test signal of
cooling standard capacity) if the set fan speed of the air-conditioner is Hi, the indoor intake
temperature is not less than 25
cooling standard capacity) if the set fan speed of the air-conditioner is Hi, the indoor intake
temperature is not less than 25
, and not more than 28
, the indoor load (
D) is 31 in
cooling full load control. This control can be stopped by the remote control.
Examination control of mis-connection
1. When the outdoor unit is running in the mode of cooling, the heat exchanger temperature of
the stopped indoor unit will fall by 15
or the heat exchanger temperature will be under
0
in 3 minutes after the compressor is started and running.
2. When the outdoor unit is running in the mode of cooling, the stopped tubing temperature
will fall by 15
in 3 minutes after the compressor is started and running.
Abnormity display: F31-07
1. When the outdoor unit is running in the mode of cooling, if the heat exchanger temperature
is continuously under -5
for 1 minute or under 0
for 5 minutes after the indoor unit is
stopped for over 5 minutes. (excluding in oil-return control and heat exchanger sensor
abnormity examination)
Abnormity display: F31-08
abnormity examination)
Abnormity display: F31-08
Freezing abnormity control of indoor unit
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CU-MP28DBH5/CU-MP50DBH5
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