'09•SRK-DB-087D
(g) Heating overload protective control
(i) Indoor unit side
1) Operating conditions :
2) Detail of operation :
3) Reset conditions :
(ii) Outdoor unit side
b) Detail of operation
c) Reset conditions:
1)
Operating conditions:
2)
Detail of operation:
(h) Heating low outdoor temperature protective control
3) Reset conditions:
-10 (-2) -8 (0) 2 (4) 4 (6)
Lower limit 60 (50) rps
Lower limit 40 (30) rps
Normal operation
Outdoor air temperature(°C )
10 11 19 20
Normal operation
Protective control ON1
Protective control ON2
Outdoor air temperature(°C)
21 22
Normal operation
Protective
control
Outdoor air temperature(°C)
• Model 50
• Model 50
1)
ޓ
Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 seconds
while the compressor command speed is other than 0 rps.
2)
ޓ
Detail of operation: The lower limit compressor command speed is change as shown in the figure belo.
Lower limit 29 rps
Normal operation
4 6
Outdoor air temperature(°C)
Model 50
A B C D
RPSmin < 40
40
<
=
RPSmin < 80
80
<
=
RPSmin < 90
90
<
=
RPSmin < 102
102
<
=
RPSmin
49
53
41
53 ~ 47
47 ~ 41
53
57
45
57 ~ 51
51 ~ 45
55
59
47
59 ~ 53
53 ~ 47
58
62
51
58
51
1) Operating conditions :
When the outdoor air temperature (TH2) is 17or 22 (14 or 20)ºC or higher continues for 30
seconds while the compressor command speed other than 0 rps.
i)
ii)
iii)
iv)
Taking the upper limit of compressor command speed range at 60 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 40 rps. However, when thethermo becomes OFF, the speed is
reduced to 0 prs.
rps.
a) Operating conditions :
b) Detail of operation
When the outdoor air temperature (TH2) is 11ºC or higher continues for 30 seconds while
the compressor command speed other than 0 rps.
i)
ii)
iii)
iv)
Taking the upper limit of compressor command speed range at 78 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 30 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 30 rps. However, when thethermo becomes OFF, the speed is
reduced to 0 prs.
rps.
.
c) Reset conditions:
.
a)
b)
30
Protective
control
NO1
NO2
Item
Compressor command speed
Low limit
30 rps
30 rps
Upper limit
78 rps
51 rps
It depends on compressor command speed
Outdoor fan speed
2nd
10
(i) Protective control I
2 (4)
4 (6)
changed as shown in the figure below.
(Example) Fuzzy
Discharge pipe temperature (˚C)
Lower limit
(4)
After lapse of 60 seconds. or over
(3)
After lapse of 60 seconds. or over
(3)
After lapse of 60 seconds. or over
(3)
4 rps
4 rps
(1)
0 rps
90 100 110
(i) Compressor overheat protection
(i) Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the com
-
pressor overheat.
(ii) Detail of operation
1)
Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Notes (1) When the discharge pipe temperature is in the range of 100 to 110 ºC, the speed is reduced by 4 rps.
(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3) If the discharge pipe temperature is in the range of 90~100ºC even when the compressor command speed is maintained for 60 second when the
temperature is in the range of 90~100ºC, the speed is raised by 1 rps and kept at that speed for 60 second. This process is repeated until the com-
mand speed is reached.
(4) Lower limit speed
(j) Current safe
(i) Purpose:
Current is controlled not to exceed the upper limit of the setting operation current.
(ii) Detail of operation:
Input current to the converter is monitored with the current sensor xed on the printed circuit board
of the outdoor unit and, if the operation current value reaches the limiting current value, the compressor
command speed is reduced.
If the mechanism is actuated when the speed of compressor command is less than 30 rps, the
compressor is stopped immediately. Operation starts again after a delay time of 3 minutes.
(k) Current cut
(i) Purpose:
Inverter is protected from overcurrent.
(ii) Detail of operation:
Output current from the converter is monitored with a shunt resistor and, if the current exceeds the
setting value, the compressor is stopped immediately. Operation starts again after a delay time of
3 minutes.
2)
If the temperature of 110ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.
When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour
but there is no start at the third time.
(l) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
The compressor is stopped if any one of the following in item (i), (ii) is satised. Once the unit is stopped by this function, it is not
restarted.
(i) When the input current is measured at 1 A or less for 3 continuous minutes or more.
(ii) If the compressor command sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being
turned on.
(m) Indoor fan motor protection
When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 min
-1
or under for more than 30 seconds, the unit enters rst in the stop mode and then stops the entire system.
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