(16) Serial signal transmission error protection
(a) Purpose:
(b) Detail of operation:
(17) Rotor lock
(18) Outdoor fan motor protection
(19) Outdoor fan control at low outdoor temperature
Cooling
1)
(a)
Operating conditions:
2) Detail of operation:
3) Reset conditions:
Outdoor air temperature > 10˚C
Outdoor air temperature <= 10˚C
Outdoor fan
Outdoor air temperature > 16˚C
Outdoor air temperature <= 16˚C
Lower limit speed
Tho-A
Tho-R
Tho-R
3rd
Tho-A
Models SCM71, 80
min
-1
(i)
a
b
Tho-R
c
a
b
-
temperature
Lower
Heating
(i)
(b)
Operating conditions:
(ii) Detail of operation:
(iii) Reset conditions:
ࠞ
ࠝ
Tho-A
Tho-A
(20) Outdoor unit fan control at overload
(i) Starting condition:
When the outdoor air temperature (Tho-A) has risen higher than 41°C for 30 seconds continu-
ously while the compressor is operating.
(ii) Contents of control:
The outdoor unit 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.
(i) Start 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 3 speed. (Lower limit is 2nd speed)
(iii) Reset condition:
When the compressor is turned off or the outdoor heat exchanger temperature (Tho-R) has dropped
lower than 10°C.
40
41
ON
Under control
OFF
Normal operation
10
13
ON
Under control
OFF
Normal operation
Outdoor air temperature(ºC)
Outdoor heat exchanger temperature(ºC)
40
41
ON
Under control
OFF
Normal operation
10
13
ON
Under control
OFF
Normal operation
Outdoor air temperature(ºC)
Outdoor heat exchanger temperature(ºC)
(a) Cooling
(b) Heating
-
202
-
'17 • SCM-T-225