-
65
-
'11 • KX-T-166
(c)
Outdoor fan cooling control at low outdoor air temperature.
(i)
Start conditions
This control is performed when all of following conditions is established.
When the ordinary outdoor fan control is performed
Outdoor air temperature
≦
10ºC (It is reset with the hysteresis of the outdoor air temperature > 15ºC.)
Outdoor fan speed = 1st speed (200 min
−
1
)
(ii)
Control contents
Initial fan speed is 200 min
−
1
If the following high pressure is detected for 20 seconds continuously, fan speed will be changed
Outdoor fan speed is in a range of 130 min
−
1
– 300 min
−
1
.
(iii)
End conditions
When either one of following conditions is established
When the ordinary outdoor unit fan cooling control ends
Outdoor air temperature > 15ºC
Outdoor fan speed
≧
2nd 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.
When it is detected LP
≦
0.75 MPa for 30 seconds continuously, the fan speed is raised by 1 tap.
When it is 0.75 MPa < LP < 0.85 MPa, the present fan speed is maintained.
When it is detected LP
≧
0.85 MPa for 30 seconds continuously, the fan speed is dropped by 1 tap.
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.)
It changes to 4th or lower speed.
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
