–
33
–
'18 • KX-SM-292
(c)
Outdoor fan cooling control at low outdoor air temperature
(i)
Starting conditions
This control is performed when all of following conditions is established.
➀
When the ordinary outdoor fan control is performed
➁
Outdoor air temperature
≦
10ºC (It is reset with the hysteresis of the outdoor air temperature > 15ºC.)
➂
Outdoor fan speed = 1st speed (200 min
-1
)
(ii)
Control contents
➀
Initial fan speed is 200 min
-1
➁
If the following high pressure is detected for 20 seconds continuously, fan speed will be changed
➂
Outdoor fan speed is in a range of 130 min
-1
– 300 min
-1
.
(iii)
Ending conditions
When either one of following conditions is established
➀
When the ordinary outdoor unit fan cooling control ends
➁
Outdoor air temperature > 15ºC
➂
Outdoor fan speed
≧
2th speed
(Note) This control range is not more than 300 min
-1
× 1fan.
(d)
Outdoor fan heating control
The fan speed control is performed based on the low pressure (detected with PSL) during heating operation.
(i)
Initial fan speed is 6th speed.
(ii)
Speed is changed depending on the low pressure value.
➀
When it is detected LP
≦
0.75 MPa for 30 seconds continuously, the fan speed is raised by 1 tap.
➁
When it is 0.75 MPa < LP < 0.85 MPa, the present fan speed is maintained.
➂
When it is detected LP
≧
0.85 MPa for 30 seconds continuously, the fan speed is dropped by 1 tap.
➃
Control range of fan speed is 1st – 8th speeds.
(iii)
When states change from LP < 1.0 MPa to HP
≧
1.0 MPa during this control, the fan speed is changed
preferentially to the following. (It returns to the normal control after the change.)
➀
It changes to 4th or lower speed.
➁
If the fan speed was lower than the above speed before the change of states, the fan speed does not change.
Valid
Invalid
10
15
Outdoor air temperature
1.4
1.7
+10 min
-1
−10 min
-1
Maintained
High pressure (MPa)
0.75
Low pressure (MPa)
0.85
One tap up
One tap down
Maintained
(5) Defrost control
(a) Temperature condition of defrost operation
(i)
Starting conditions
jumper wire J15.)
Defrost operation will start, when outdoor unit whose compressor is operating under heating mode has satisfied all
the following conditions.
1) When 33 minutes of cumulative compressor operation time has passed since heating operation started.
2) When 33 minutes of cumulative compressor operation time has passed since the previous defrost operation ended.
3) When 8 minutes has passed since the compressor turned ON from OFF status.
4) When 8minutes has passed since one outdoor fan turned ON from OFF status.
5) After all above conditions have been met, when any of the following conditions is satisfied
➀
When the outdoor heat exchanger temperature (sensed by Tho-R) and the outdoor air temperature (sensed
by Tho-A) dropped below the defrost operation start temperature in Fig. 1 for 30 seconds continuously.
➁
When the suction pressure saturated temperature calculated by the low pressure (sensed by PSL) and the
outdoor air temperature (sensed by Tho-A) dropped below the defrost operation start temperature in Fig. 2 for 3
minutes continuously
TR
: Heat
exchanger temperatur
e (°C)
TA: Outdoor air temperature (°C)
TA: Outdoor air temperature (°C)
Fig. 1
Cold region
Standard
(Factory setting)
Defrost start zone
-2
-6
-15
-19
-21
-25
-20
-15
6
Without J15
Cold region specification
With J15
SS
T
: Suction pressure saturated temperatur
e (°C)
Fig. 2
Cold region
Standard
(Factory setting)
Defrost start zone
-6
-10
-19
-23
-25
-29
-20
-15
6
Without J15
Cold region specification
With J15
(ii) Ending conditions
Defrost operation stops when any of the following conditions is satisfied
1) When 12 minutes has passed since defrost operation started
2)
When the outdoor heat exchanger temperature (sensed by Tho-R) is detected 10°C or higher continuously for
10 seconds
3)
When it has detected the high pressure (HP) ≥ 3.0MPa
(b) Time condition of defrost operation
(i) Starting conditions
Defrost operation start when all of the following conditions are satisfied
1) When 33 minutes of cumulative compressor operation time has passed since heating operation started.
2) When 33 minutes of cumulative compressor operation time has passed since the previous defrost operation ended.
3) When 105 seconds has passed since the compressor turned ON from OFF status in heating mode.
4) When the oil return condition has been established
5) Following cases are excluded.
➀
When the upper limit frequency of the compressor protection start A or B is lower than the defrost
frequency
➁
During the normal compressor protection start
(ii) Ending conditions
Defrost operation stops when any of the following conditions is satisfied
1) When 12 minutes has passed since defrost started
2) When the outdoor heat exchanger temperature (sensed by Tho-R) is detected 10°C or higher continuously for
10 seconds
3)
When it has detected the high pressure (HP) ≥3.0MPa
(Standard speci
fi
cation or cold region speci
fi
cation can be selected by switching the
Summary of Contents for FDC224KXZME1
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Page 170: ... 169 18 KX SM 292 Screw ...
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