Outdoor Fan Control At Overload - Mitsubishi Heavy Industries SCM50ZS-S1 Technical Manual

(20) Outdoor fan control at overload

(a) Cooling
(i) Starting condition
When the outdoor air temperature (Tho-A) has risen higher than 41°C for 30 seconds continuously while the com-
pressor is operating.
(ii) Contents of control
The outdoor fan is stepped up by 3 speed. (Upper limit 6th speed)
(iii) Reset condition
When the compressor is turned off or the outdoor air temperature (Tho-A) has dropped lower than 40°C.
(b) Heating
(i) Starting condition
When the outdoor heat exchanger temperature (Tho-R) has risen higher than 13°C for 30 seconds continuously
while the compressor is operating.
(ii) Contents of control
The outdoor unit fan is stepped down by B speed. (Lower limit is C speed)
(iii) Reset condition
When the compressor is turned off or the outdoor heat exchanger temperature (Tho-R) has dropped lower than A.
Model
SCM50
Indoor unit : 1 unit
SCM60
Indoor unit : 2 units or more
Under control
Normal operation
OFF
40
Outdoor air temperature(ºC)
Under control
Normal operation
OFF
Under control
40
Normal operation
OFF
Outdoor air temperature(ºC)
A
Outdoor heat exchanger temperature(ºC)
Under control
Normal operation
OFF
A
Outdoor heat exchanger temperature(ºC)
A
10
8
10
193
-
ON
41
ON
ON
41
13
ON
13
B C
3 2nd
4 1st
3 2nd
-
'18 • SCM-T-251