Outdoor Fan Control At Overload - Mitsubishi Heavy Industries SCM50ZS-W Service Manual

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(iii) Reset conditions (iii) Reset conditions
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2 2
(b)
Heating
(i) Operating conditions
(ii) Detail of operation
(iii) Reset conditions

(19) 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 unit fan is stepped up by 3 speed. 〔 Upper limit 7th 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) Start condition
When the outdoor heat exchanger temperature (Tho-R1) 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 3 speed. (Lower limit is 2nd speed)
(iii) Reset condition
When the compressor is turned off or the outdoor heat exchanger temperature (Tho-R1) has dropped lower than 10°C.
Lower Lower
Outdoor air temperature > 16˚C Outdoor air temperature > 16˚C
Outdoor air temperature < = 16˚C Outdoor air temperature < = 16˚C
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45
temperature temperature
45 45
Tho-A Tho-A
Tho-A
Tho-A
Normal operation
OFF
Outdoor air temperature(ºC)
Normal operation
OFF
Normal operation
Outdoor air temperature(ºC)
OFF
Outdoor heat exchanger temperature(ºC)
Normal operation
OFF
Outdoor heat exchanger temperature(ºC)
Lower limit speed Lower limit speed
Tho-R2 Tho-R2 45°C 45°C
Tho-R2 Tho-R2 45°C 45°C
Under control
ON
40 41
Under control
ON
Under control
40 41
ON
10 13
Under control
ON
10 13
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