Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 157

(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
Item
LO
AUTO,HI,MED
Note (1) Ranges A and B are as shown below.
Range A
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%.
(b) Frost prevention control
(i) Operating conditions
1)
2)
(ii) Detail of anti-frost operation
Indoor heat exchanger
Item
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
(iii) Reset conditions
1)
2)
(c) Cooling overload protective control
(i) Operating conditions
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.
Item
Upper limit of compressor's speed
Indoor fan
Upper limit of compressor's speed
Indoor fan
Range B
73
68
Humidity(%)
temperature 5°C or lower
(model SRK50 : 23 rps)
Depends on compressor speed
-
Model
SRK20-35ZS-S
Model
SRK35ZS-S
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 40rps
RangeA: 45rps, RangeB: 45rps RangeA: 50rps, RangeB: 40rps
Adaptable to compressor speed
2.5°C or lower
Keep the fan speed before
frost prevention control
2.5–5
5–8
156
-
SRK50ZS-S
'17 • SCM-T-225
SRK50ZS-S
4th speed
(Lower limit 4th speed)
'09•SRK-DB-087D
compressor
speed
Lower
limit
speed
0 rps
2.5
Indoor heat exchanger
temperature (°C)
ON1
OFF
5 8
ON2