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9.17.3. Diagram of expansion valve control
(cooling and soft dry)
Preliminary actions
when power supply
is switched on
Slave stopped
cooling
oil-return control
Heating liquid-
gathering control
Preliminary control
impulse setting
Impulse closed
Slave stopped
Slave running
Initial impulse setting
Maximal and
minimum control
Changing
unit over 15hz
1. Indoor heat exchanger
too hot/indoor
temperature load control
Receive initial
impulse from outdoor
Every 30 seconds
2. Expansion valve correction
value control in cooling
room (outdoor side)
Every 2 minutes
Correction impulse control
Total correction
impulse of 1 and 2
109
CU-MP28DBH5/CU-MP50DBH5
9.18. Cooling mode operation
According to the indoor temperature-set the temperature so as to determine
the indoor load (
the indoor load (
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
110
CU-MP28DBH5/CU-MP50DBH5
9.18.1. 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 shut-down relay to the outdoor
unit and the air-conditioner will stop running.
the indoor unit will send the signal of shut-down relay to the outdoor
unit and the air-conditioner will stop running.
Within 3 minutes after the air-conditioner stopped running, it cannot be restarted at once
although the indoor load (
although the indoor load (
D) exceeds the range in the following table.
9.18.2. Outline of indoor load (
D) control actions
The indoor load (
D) in blowing running is: 0
Stop
In abnormal display
cooling rated
capacity control
capacity control
In floating switch actions
In delay control 3 minutes
after stop
after stop
In stop areas of deicing
control
In abnormal mode
Forced cooling
running
running
Within 5 minutes after
restart
restart
Indoor load in indoor temperature area
Type
EEPROM data
Except the above
0
0
0
0
0
0
22
22
22
22
22
22
22
22
22
22
22
22
13
12
13
12
Relay shut-down position
EEPROM data
Type
Wall-mounted
type
Cassette type
Hide-away
D2 D3
Relay shut-down position
14
13
14
13
111
Hide-away
D4
Wall-mounted
type
Cassette type
Hide-away
D2 D3
Hide-away
D4
CU-MP28DBH5/CU-MP50DBH5
cooling full load control
When there is a difference of over 5
between the set temperature and the indoor
temperature after running:
If the cooling load is high, lower the set temperature so as to reduce the running obstacle
caused by compressor stop. The indoor fan control will not change.
caused by compressor stop. The indoor fan control will not change.
Deicing control
Whatever the type is, if the fan speed has reached the high position, it will not change. In
the resumed area, the fan speed will not be subject to deicing control.
the resumed area, the fan speed will not be subject to deicing control.
indoor temperature
set temperature
after 30-minutes full load running
normal running
running
4 m i n u t e s a f t e r t h e c o m p r e s s o r i s
started, if the temperature continues to
fall (as the right Table), the compressor
will stop running so as to prevent the
indoor heat exchanger from frosting.
The fan speed will change.
When the temperature of the indoor heat
exchanger rises to DT04 (resumed), the
compressor will be restarted.
started, if the temperature continues to
fall (as the right Table), the compressor
will stop running so as to prevent the
indoor heat exchanger from frosting.
The fan speed will change.
When the temperature of the indoor heat
exchanger rises to DT04 (resumed), the
compressor will be restarted.
In the status of cooling operation, 6-
minute waiting time in time delay safety
control is effective.
Wall-mounted type: When the heat
exchanger temperature moves from
DT03 to DT04, the fan speed will rise by
1 tap.
Other: The fan speed will rise by 1 tap.
control is effective.
Wall-mounted type: When the heat
exchanger temperature moves from
DT03 to DT04, the fan speed will rise by
1 tap.
Other: The fan speed will rise by 1 tap.
DT04
DT03
DT02
DT01
DT00
resetting range
rising range
Unchanged range
falling range
stop range
indoor heat
exchanger
temperature
exchanger
temperature
6 minutes
When the indoor tubing temperature exceeds DT04 (
), deicing control will be released.
Type
Deicing control
1HP
1.5HP
1.75HP
2HP
2.5HP
3HP
0
0
0
0
0
0
3
3
3
3
3
3
4
4
4
4
4
4
5
5
5
5
5
5
6
6
6
6
6
6
DT00
DT01
DT02
DT03
DT04
112
CU-MP28DBH5/CU-MP50DBH5
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