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Normal condition
Indoor fan
60 seconds
30 seconds
Set fan speed with
remote control
remote control
Remote control on or
indoor unit started
indoor unit started
stop
Max Slo
Max LO
Forced operation control
1. When the air-conditioner has been continuously running for over 60 minutes, carry out heating
rated capacity control (1. send fixed
D of 1; 2 to outdoor; 2.send the test signal of heating
standard capacity) if the set fan speed of the air-conditioner is SHi, the indoor intake
temperature is not less than 17
temperature is not less than 17
, and not more than 23
, the outdoor temperature is not less
than 6
and not more than 9
, and the indoor load (
D) is 1. This control can be stopped by the
remote control.
Heating rated capacity control
in the case of
overload
overload
indoor tubing
temperature
temperature
indoor fan
60 seconds
set fan speed with
remote control
remote control
stop
remote control on or
indoor unit started
indoor unit started
50
50
Max Slo
Max LO
When the outdoor unit compressor is running, and the indoor unit begins to run or is reset from
the stop status, the indoor unit will send the maximal indoor load (
the stop status, the indoor unit will send the maximal indoor load (
D) signal 19 (wall-mounted
type) or 20 (other) to the outdoor unit in 90 seconds.
After being stopped for 30 seconds, the indoor unit will run at maximal SLo (wall-mounted type)
or Lo (other) for 30 seconds, and then operates with the fan speed
or Lo (other) for 30 seconds, and then operates with the fan speed
with the Remote control.
But if the indoor unit tubing temperature exceeds 50
, the indoor fan will run at maximal Slo
(wall-mounted type) or Lo (other).
If the indoor unit tubing temperature exceeds 55
, the indoor fan will run with the fan speed set
with the remote control.
set
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CU-MP28DBH5/CU-MP50DBH5
stop
tubing temperature
52
37
33
31
19
32
24
16
instant maximal
rotating speed
rotating speed
rise
fall
unchanged
manual fan speed and
auto airflow direction
auto airflow direction
Lo
Lo-
Slo
stop
tubing temperature
58
52
37
33
31
19
53
34
32
24
16
instant maximal
rotating speed
rotating speed
rise
fall
unchanged
manual fan speed and
auto airflow direction
auto airflow direction
Lo-
Slo
Me
Manual fan speed and
auto airflow direction
auto airflow direction
stop
tubing temperature
58
52
37
33
31
19
53
34
32
24
16
set fan speed with
remote control
remote control
Min Me
Lo
Lo-
Slo
tubing temperature
58
52
37
33
31
19
53
34
32
24
16
Manual fan speed and
auto airflow direction
auto airflow direction
set fan speed with
remote control
remote control
stop
Min Me
Lo
Slo
1. According to indoor tubing temperature, carry out indoor fan control (wall-mounted type)
Carry out the following control, according to the fan speed, the airflow direction,
and auto or manual:
and auto or manual:
Indoor tubing temperature control
2. According to indoor tubing temperature, carry out indoor fan control (other)
Carry out the following control, according to the fan speed, the airflow direction,
and auto or manual:
and auto or manual:
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CU-MP28DBH5/CU-MP50DBH5
tubing temperature
58
32
20
34
23
17
manual fan speed and m
anual/auto airflow direction
anual/auto airflow direction
stop
Min Me
Lo
Me
Hi
Instant Hi
38
manual fan speed and
manual/auto airflow direction
manual/auto airflow direction
tubing temperature
58
32
20
53
23
17
stop
Min Me
Lo
S e t
f a n
s p e e d
with remote control
Heating fan speed control (only for wall-mounted type)
1. When the indoor unit is in heating operation, gradually increase the fan rotating speed according
to the following table if the fan speed is under Lo or the indoor temperature is over 28
.
fan speed
under Lo
under Lo
three times at most
30 seconds
30 seconds
30 seconds
Fan speed limit when indoor unit is stopped
In multi-indoor unit running, when one slave is stopped (at this moment the refrigerant in the
slave must be recycled), the indoor fan will stop and the heat exchange will fall sharply and
cause high pressure if it stops running.
slave must be recycled), the indoor fan will stop and the heat exchange will fall sharply and
cause high pressure if it stops running.
When the compressor is stopped, the indoor fan will run at maximal Lo- (wall-mounted type) and Lo
(other).
When the compressor is running, the indoor fan will stop. (but the fan will run at the current fan speed
(other).
When the compressor is running, the indoor fan will stop. (but the fan will run at the current fan speed
for 20 seconds and then be shut down)
The purpose of fan delay is the same as heating and heat-removing control.
When the mode of heating is not changed and one slave is stopped, the
When the mode of heating is not changed and one slave is stopped, the
above-mentioned control will be carried out.
When the compressor is stopped, the fan speed reaches over Me or the indoor temperature falls
under 26
under 26
, heating fan speed control will be released.
In this control, the fan speed can be increased three times at most. (wall-mounted type 1HP
once: +20r/min; wall-mounted type 1.5HP/2HP once: +10r/min)
once: +20r/min; wall-mounted type 1.5HP/2HP once: +10r/min)
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CU-MP28DBH5/CU-MP50DBH5
Indoor temperature sample control
1. When the compressor is running and the indoor fan is stopped, the indoor unit will carry out
periodic sampling. If each slave respectively samples, stability of cooling will be decreased.
Therefore, after each slave receives the sample permission from the outdoor unit, they will
carry indoor temperature sampling together.
Therefore, after each slave receives the sample permission from the outdoor unit, they will
carry indoor temperature sampling together.
2. In the sampling of each indoor unit, the running frequency of the compressor will be increased,
and the indoor fan running will be delayed by 15 seconds.
Send signal to
outdoor unit
outdoor unit
Indoor fan
stop
15 seconds
Type
Wall-mounted
type
type
Cassette type
Hide-away
D2
D2
T1
75 seconds
75 seconds
65 seconds
30 seconds
30 seconds
Heating and heat-removing control
In heating operation, when the Remote control is used to stop running, the compressor is still
running ,and the tubing temperature is over 50
, the indoor fan should run at Lo- and heating
airflow direction 5 (wall-mounted type) for 30 seconds or Lo and heating airflow direction 1
(other) for 30 seconds so as to prevent overload control from being stopped.
When the compressor is stopped or lasts for 30 seconds, this control will be released.
(other) for 30 seconds so as to prevent overload control from being stopped.
When the compressor is stopped or lasts for 30 seconds, this control will be released.
Heating full load control
At the beginning of running, there is a discrepancy of over 5
between the set temperature and
the indoor temperature.
set temperature
indoor temperature
running on
normal running
after 30-minutes full load running
5
2
In heating operation, if the outdoor air temperature is very low, the set temperature will be
increased so as to guarantee comfortability. The maximal time of full load running is 1 hour.
increased so as to guarantee comfortability. The maximal time of full load running is 1 hour.
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Slo, lo
Slo, lo
T1
Hide-away
D3
D3
Hide-away
D4
D4
CU-MP28DBH5/CU-MP50DBH5