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3. In 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.
A. The floating switch is continuously on for over 5 minutes.
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.
ON
OFF
ON
OFF
ON
OFF
10 seconds
5 minutes
Timer indicator light flashing
compressor
relay
draining pump
2. When indoor unit is stopped:
When the indoor unit is stopped, the draining pump will be run forcefully for 6 minutes and be shut
down in order to avoid the return water in the draining pipeline.
down in order to avoid the return water in the draining pipeline.
compressor
relay
draining pump
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
6 seconds
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
Control is effective if forced operation lasts 6 minutes.
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CU-MP28DBH5/CU-MP50DBH5
C. The floating switch will be switched on twice within 20 minutes after it is reset.
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
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.).
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CU-MP28DBH5/CU-MP50DBH5
9.20. Heating operation
According to the indoor temperature-set the temperature so as to determine t h e
i n d o o r l o a d (
i n d o o r l o a d (
D ) .
indoor load
D
indoor temperature
set temperature
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
-5.5
-6.0
-6.5
-7.0
-7.5
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
123
CU-MP28DBH5/CU-MP50DBH5
1. Forced operation: When the air-conditioner is started from the stop status, or from
another mode into the heating mode, it will be forcefully run without regard to the
intake temperature. But protection control is effective.
intake temperature. But protection control is effective.
2. When the indoor load (
D) is under the values tabled in the following table and the
indoor unit has been running for 5 minutes, the indoor unit will send the signal of
relay shut-down to the outdoor unit and the air-conditioner will stop running.
relay shut-down to the outdoor unit and the air-conditioner will stop running.
3. Outline of indoor load (
D) control actions
Relay shut-down position
EEPROM data
Type
Wall-mounted
type
type
Cassette type
Hide-away type
D2 D3
D2 D3
Relay shut-down position
21
22
24
22
Within 3 minutes after the air-conditioner stops running, it can not be restarted at once
although the indoor load (
although the indoor load (
D) exceeds the range in the following table.
Note: In deicing running, the compressor will run solely on the fixed compressor frequency.
EEPROM data
Indoor load in indoor temperature area
Except the above
22
23
25
23
Type
In abnormal display
Heating rated capacity control
Heating low-temperature
capacity control
capacity control
In delay control 3 minutes
after stop
after stop
Forced heating operation
In abnormal mode
Within 5 minutes after restart
In deicing running (or preparing)
0
1
0
1
1
1
Except
the
above
Maximal
limit
Forced operation at the
beginning of heating
beginning of heating
In warm boot
Within 3 minutes after
warm boot
warm boot
20
21
23
21
20
21
23
21
20
21
23
21
124
Hide-away type
D4
D4
Wall-mounted
type
type
Cassette type
Hide-away
type D2 D3
Hide-away
type D4
type D4
CU-MP28DBH5/CU-MP50DBH5
Note
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