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156
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'17 • SCM-T-225
(18) Protective control function
(a) Dew prevention control [Cooling]
Prevents dewing on the indoor unit. (SRK35, 50ZS-S only)
(i) Operating conditions
When the following conditions have been satisfied for more than 30 minutes after starting operation
1)
Compressor’s speed is 32 (model SRK50:28) rps or higher.
2)
Detected value of humidity is 68% or higher.
(ii) Contents of operation
1)
Air capacity control
Model
Item
SRK35ZS-S
SRK50ZS-S
LO
Upper limit of compressor's speed
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 40rps
Indoor fan
4th speed
AUTO,HI,MED
Upper limit of compressor's speed
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 40rps
Indoor fan
Adaptable to compressor speed
(Lower limit 4th speed)
Note (1) Ranges A and B are as shown below.
2)
When this control has continued for more than 30 minutes continuously,the following wind direction control is performed.
a) When the vertical wind direction is set at other than the vertical swing,the flaps change to the horizontal position.
b) When the horizontal wind direction is set at other than the horizontal swing,the louver changes to the vertical position.
(iii) Reset condition
Humidity is less than 63%.
Humidity(%)
68
73
Range A
Range B
'09•SRK-DB-087D
(b) Frost prevention control
(i) Operating conditions
(ii) Detail of anti-frost operation
(iii) Reset conditions
Indoor heat exchanger
temperature (°C)
2.5
5
8
0 rps
Lower
limit
speed
(c) Cooling overload protective control
(i) Operating conditions
(ii) Detail of operation
Indoor heat exchanger
temperature
Item
5°C or lower
2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Item
SRK20-35ZS-S
SRK50ZS-S
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 40 (model SRK50 : 29 or 35) rps.
However, when the thermo OFF, the speed is reduced to 0 rps.
The outdoor fan is stepped up by 3 speed step. [Upper limit 7 (model SRK50 : 8) th speed.]
compressor
speed
Keep the fan speed before
frost prevention control
2.5–5
5–8
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41°C or more, or 47ºC or more
with the compressor running, the lower limit speed of compressor is brought up.
Outdoor air temperature (°C)
40 41
46 47
OFF
ON1
ON2
41°C or more
29 rps
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling.
(ii) Detector
Outdoor heat exchanger sensor (TH1).
(iii) Detail of operation
P1
P2
P3
Outdoor heat exchanger temperature (°C)
6rps
(1)
6rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or ove
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3
䉝
, the speed is reduced by 6 rps at each 30 seconds.
(2) When the temperature is P3
䉝㻌
or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2
䉝
, if the compressor speed is been maintained and the operation has continued for
more than 30 seconds at the same speed, it returns to the normal cooling operation.
r
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻞㻜㻘㻌㻞㻡
㻿㻾㻷㻟㻡㻘㻌㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31
32
Range B
㻠㻤
㻡㻟
㻡㻝
㻡㻟
㻡㻝
㻡㻤
㻡㻠
㻡㻤
㻡㻟
㻼㻝
㻼㻞
㼀㻴㻝㻔
䉝
㻕
TH1(
䉝
)
㻼㻟
㻢㻟
㻡㻤
㻢㻟
